AUTOMATIC CLOSED-TRANSITION &BY PASS-ISOLATION SWITCHES
Please note: This system will momentarily connect the emergency generator to the utility
during transfer. This usually necessitates obtaining approval from the uillty maintaining
frequncy within 0.2 HZ of nominal.
Division 16 – Electrical
Standby power generator systems
PART 1 GENERAL
1.01 Scope
A. Furnish and install automatic closed transiltion transfer & bypass-isolation
switch (CTTS/BPS) with number of poles, amperage, voltage, and withstand
current reting as shown on the plans. Each CTTS/BPS system (S) consists of
a colosed translion transfer switch and a tow-way bypass/isolation switch.
All CTTS/BPSS and control modules are the product of ASCO.
B. The CTTS/BPS transfers the load without interruption (closed transition) by
momrntaily connecting both sources of power only when both sourced are
present and acceptable. The maximum interconnection time is 100
milliseconds. The CTTS operates as a conventional break-before-make
(open transition) switch when the power source serving the load fils designs
that transfer in a delayed transition manner (intentional delay in the neutral
position) when closed transfer is bypassed are not used.
1.02 Codes and Standards
The automatic closed transition transfer & bypass-isolation switches and accessories
conforms to the requirments of:
A. UL 1008 – Standard for transfer switch equipment
B. ICE 947-6-1 Low-voltage switchgear and controgear; multifunction
equipment; automatic transfer switching equipment.
C. NFPA 70 – National electrcal code.
D. NFPA 99 – Essntail electrcal system for health care facilites.
E. NFPA 110 – emergency and standby power systems.
F. IEEE standard 446 – IEEE recommended practice for emergency and
standby power systems for commercical and industrial applications
G. NEMA standard ICS10-1993 (formerly ICS2-447) –AC automatic tranfer
switches.
H. UL 508 industrial control equipment.
2
PART 2 PRODUCTS
2.01 Mechanically held transfer switch
A. The transfer switch is electrivcally operated and mechancally held. The
electrical operator is a momentarilly energized, solenold menchanism.
Main operators that include overcurrent disconnect devices, linear motors
or gears are not used. The switch is mechanically interloced to ensure
only two possible positions, normal or emergency.
B. All transfer switch sizes use only one type of main operator for ease of
maintenance and commonality of parts.
C. The switch is positively locked and unaffected by momentary outages, so
that contact pressure is maintained at a constant value and contact
temperature rise is minmized for maximum reliability and operating life.
D. All main contacts are silver composition. Switches rated 600 amperes and
above are segmented, blow-on construction for high withstand and closeon
capability and be protected by separte arcing contacts.
E. Inspection of all contacts is possible from the switch without
disassembly of operating linkages and without disconnection of power
conductors. Switches rated 600 amps and higher have front removable
and replaceable contacts. All stationary and moveable contacts are
replaceable without removing power conductors and/or bus bars.
F. Designs utilizing components of molded-case circuit breakers,
contactors, or parts thereof, which are not inteded for continuous duty,
repptitive switching or transfer between two active power sources are
not used.
G. Where neutral conductors are to be solidly connected as shown on the
plans, a neutral conductor plate with fully reted AL-CU pressure
connectors is provided.
2.2 Bypass-Lsolation Switch
A. The two-way bypass-isolation switch provides manual bypass of the
load to either source and permit isloation of the automatic transfer
sweitch from all source and load power conductors. All main conctacts
are manually driven.
B. Power intrconnections are silver-plated copper bus bar. The only field
instahhed power connections are at the service and load terminals of the
bypass-isolation switch. All control inter-wiring is provided with
disconnect plugs.
C. Seprate bypass and isolation handles are utilized to provide clear distinction
between the functions. Handles are permanently affixed and operable
without opening the enclosure door. Desgns requiring insertion of loose
operating handles or opening of the enclosure door to operate are not used.
D. Bypass to the load-carrying source is accomplished with no interrupation of
power to the load (make before break contacts). Designs which disconnect
operating modes: "bypass to normal" automatic and bypass to emergency.
The operating speed of the bypass contacts are the same as the associted
transfer switch and are independent of the speed at which the manual handle
is operated. In the "Automatic" mode, the bypass contacts are out of the
3
power circuit so that will circuit so that they will not be subjected to fault
currents to which the system may be subjected.
E. The isolation handle provides three operatiog modes: "Closed" "Test"
and"Open." The "Test" mode permits testing of the entrie emergency power
system, including the automatic transfer switches with no interruption of
power to the load. The "Open" mode completely isolates the automatic
transfer switch from all source and load power conductors. When in the
"Open" mode, it is possible to completely withdraw the automatic transfer
switch for inspection or maintenance to conform to code requirments
without removal of power conductors or the use of any tools.
F. When the isolation switch is the "Test" or "Open" mode, the bypass switch
functios as a manual transfer switch.
G. Designs requiring operation of key interlocks for bypass isolation or ATSs
that cannot be completely withdrawn when isolated are not used.
2.3 Microprocessor Controller
A. The controller's sensing and logic is provided by a single built-in
microproessor for maximum reliability, minimum maintenance, and the
ability to communicate serially through an optional serial
communication module.
B. A single controller provides twelve selecable nominal voltage for
maximum apprlication flexibility and minimal spare part
requirements. Volatge sensing is the true RMS type and is accurate to
+- 1% of nominal voltage. Frequency sensing is accurste to +- 0.2%.
The panel is capable of oerating over a temperature range of -20 to +
60 degrees C and stroage from -55 to + 85 degrees C.
C. The controller is connected to the transfer switch by an interconnecting
wiring harness. The haraness includes a keyed disconnect plug to enable
the controller to be disconnected from the transfer switch for routine
maintenance. Sensing and control logic is on multi-layer printed circuit
boards.interfacing relays are industral grade plug-in type with dust
covers. The panel is enclosed with a protective cover and moiantenance.
The protective cover includes a built-in pocket for storage of the
operator's manuals.
D. All customer are wired to a common terminal block to simplify fieldwiring
connections.
E. The control meets or exceeds the requirments for electromagentic
compatibililty (EMC) as follows:
1. IEEE 472 (ANSI C37.90A) Ring Wave Test.
2. ENC55011 1991 Class A Conducted and Radiated Emission.
3. EN61000-4-2 Electrostatic Discharge Immunity, Direct Cotact & Air
Dischage.
4. EN61000-4-3 Radiated Electromagnetic Field Immunity.
5. EN61000-4-4 Eletrical Fast Transeint Immunity.
6. EN61000-4-5 Surge Immunity.
7. ENV50141 HF Conducted Disturbances Immunity.
4
2.04 Enclosure
A. The CTTS/BPS is furnished in a NEMA type 1 enclosure unless
otherwise shown on the plans.
B. All standard and optional door-mounted switches and pilot lights are
16-mm industrial grade type or equivalent for easy viewing &
replacement. Door controls are provided on a seprate removable plate,
which are supplied loose for open type units.
PART 3 OPERATION
3.01 Controller Display and Keypad
A. A four ;ine, 20 character LCD display and keypad are an integral part of
the controller for viewing all available data and setting desired operational
parameters. Operational parameters are also be available for viewing and
limited conrtol through the serial communications input port. The
following parametrs are only adjusatble via DIP swiches on the controller:
1. Norminal line voltage and frequency.
2. Single or three phase sensing.
3. Operating parameter protection.
4. Transfer operating mode configuation.
( Open transition, Closed transition or Delayed transition)
All insteuctions and controller settings are esily accessible, readable and
accomplished without the use of codes, calculation manuals.
3.02 Voltage, Frequency and phase Rotation Sensing
A. Voltage and frequency on both the normal and emergency sources (as
noted below) are continuously monitored, with the following pickup,
dropout and trip setting capabilities (values shown as % of nominal
unless otherwise specified):
Parameter Sources Dropout / Trip Pickup / Reset
Undervoltage N&E,30 70 to 98% 85 to 100%
Overvoltage N&E,30 102 to 115% 2% below trip
Underfrequncy N&E 85 to 98% 90 to 100%
Overfrequency N&E 102 to 110% 2% below trip
Voltage unbalance N&E 5 to 20% 1% below dropout
B. Repetitive accuracy of all seyyings are within +- 0.5% over an
operating temperature range of – 20C to 60C.
C. Voltage and frequency settings are field adjustable in 1% increments
either locally with the display and keypad or remotely via serial
communications port access.
D. The controller is capable (when activated by the keypad or through the
serial port) of sensing the phase rotation of both the normal and
emergency sources. The source is considered unacceptable if the
phase rotation is not the preferred rotation selected (ABC or CBA).
5
E. Source ststus screens are provided for both normal and emergency to
provide digital readout of voltage on all three phases, frequency and
phase rotation.
3.03 Time Delays
A. An adjustable time delay of 0 to 6 seconds is provided to override momentary normal
source outages and dealy all transfer and engige starting signals. Providng an external 24
VDC power supply provides capability to extend this time dealy to 60 minutes.
B. A time delay is provided on transfer to emergency, adjustable from 0 to 60 minutes,
for controlled timing of transfer of loads to emergency.
C. An adjustable time delay of 0 to 6 seconds to override momentary emergency source
outage to delay all reeransfer signals during intial loading of engine generator set.
D. Two time delay modes (which are independently adjustable) are provided on retransfer
to normal. One time delay is for actual normal power filures and the other is for
the test mode function. The time delays are adjustable from 0 to 60 minutes. Time delay
is automatically bypassed if the emergency source fails and the normal source is
acceptable.
E. A time delay is provided on shut down of engine generator for cool down, adjustable
from 0 to 60 minutes.
F. A time delay is provated output signal is also provided to drive an extrenal relay(S)
for selective load disconnect control. The controller has the ability to activate an
adjustable 0 to 5 minute time delay in any of the following modes:
1. Prior to transfer only.
2. Prior to after transfer.
3.Normal to emergency only.
4.Emergency to normal only.
5.Normal to emergency and emergency to normal.
6. All transfer conditions or only when both sources are available.
G.The controller also includes the following built-in time delays for closed
transition transfer with Bypass-lsolation operation:
1. 1 to 5 minute time delay on failure to synchronize normal and emergency
sources prior to closed transition transfer.
2. 01 to 9.99 second time delay on an extended parallel condition of both power
sources during closed transition operation.
H. All time delays are adjustable in 1 second increments, except the extended
parallel time, which is adjustable in .01 second increments.
I. All time delays are adjustable by using the LCD display and keypad or with a
remote device connected to the serial communications port. The time delay
value displayed on the LCD or remote device is the remaining time until the
next event occurs.
3.04 Additional features
A. A three position momentary-type test switch is provided for the
test / automatic / reset modes. The test position simulates a
normal source failure. The reset position bypasses the time delays
on either transfer to emergency or retransfer to normal. Switches
6
that require utilizing the keypad and display function or have no
manual time delay bypass means are not used.
B. A set of DPDT gold-flashed contacts rated 10 amps, 32 VDC is provided for a
low-voltage engine start signal. The start signal prevents dry cranking of the engine by
requiring the generator set to reach proper output, and run for the duration of the cool
down setting, regardless of whether the normal source restores before the load is
transferred.
C. Auxiliary contacts, rated 10 amps, 250 VAC are provided consisting of one
contact, closed
when the CTTS is connected to the normal source and one contact closed,
when the CTTS is
connected to the emergency source.
D. LED indicating lights (16mm industrial grade, type 12) are provided; one to
indicate when the CTTS is connected to the normal source (green) and one to indicate
when the CTTS is connected to emergency source (red).
E. LED indicating lights (16mm industrial grade, type 12) are provided and
energized by controller outputs. The lights shall provide true source availability of the
normal an emergency sources, as determined by the voltage sensing trip and reset
settings for each source.
The following features shall be built-in to the controller, but
capable of being activated through keypad programming or the
serial port only when required by the user:
F. provide the ability to select "commit/no commit to transfer" determine whether
the load should be transferred to the emergency generator if the normal source restores
before the generator is accept the load.
G. terminals are provided for a remote contact which opens to signal the CTTS to
transfer to emergency and for remote contacts which open to inhibit transfer to
emergency and/or retransfer to normal. Both of these inhibit signals are activated
through the keypad or serial port.
H. An in-phase monitor is provided in the controller. The monitor controls
transfer so that motor load inrush currents do not exceed normal starting currents, and
shall not require external control of power sources. The in-phase monitor is specifically
designed for and is the product of ASCO.
I. The controller is capable of accepting a normally open contact that allows the
transfer switch to function in a non-automatic mode using an external control device.
J. Engine Exerciser – the controller provides an internal engine exerciser. The
engine exerciser allows the user to program up to seven different exerciser routines. For
each routine, the user is able to:
1. Enable or disable the routine.
2. Enable or disable transfer of the load during routine.
3. Set the start time,
- Time of day
- Day of week
- Week of month (1st, 2nd, 3rd, 4th, alternate or every)
4. Set the duration of the run. At the end of the specified duration the switch
transfers the load back to normal and run the generator for the specified cool down
7
period. A10-year life battery that supplies power to the real time clock in the event of a
power loss will maintain all time and date information.
K. System Status – the controller LCD display includes a "System Status"
screen which shall be readily accessible from any point in the menu by depressing the
"ESC" key a maximum of two times. This screen displays a clear description of the
active operating sequence and switch position. For example,
Normal failed
Load on normal
TD normal to emerge
2min 15s
Controllers that require multiple screens to determine system status or display
"coded" system status messages, which must be explained by references in the operator's
manual, are not used.
L. Self Diagnostics – the controller contains a diagnostic screen for the purpose
of detecting system errors. This screen provides information on the status input signals
to the controller which may be preventing load transfer commands from being
completed.
M. communication interface-the controller is capable of interfacing, through
an optional serial communication module, with a network of transfer switches, locally
(up to 4000 ft.) or remotely through modem serial communications. Standard software
specific for transfer switch applications is available by ASCO. This software allows for
the monitoring, control and setup of parameters.
N. Data logging – the controller has the ability to log data and to maintain the
last 99 events, even in the event of total power loss. The following events are time and
date stamped and maintained in a non-volatile memory:
1. Event logging
1. Date and time and reason for transfer normal to emergency.
2. Date and time and reason for transfer emergency t
3. Date and time and reason for engine start.
4. Date and time engine stopped.
5. Date and time emergency source available.
6. Date and time emergency source not available.
2. Statistical Date
1. Total number of transfers.
2. Total number of transfers due to source failure.
3. Total number of day's controller is energized.
4. Total number of hours both normal and emergency sources
are available.
O. Communications Module-A full duplex RS485 interface is installed in the
CTTS controller to enable serial communications. The serial communications is capable
of a direct connect or multi-drop configured network. This module allows for the
seamless integration of existing or new communications transfer devices. The serial
communication interface is called (ASCO Accessory 72).
PART 4 ADDITIONAL REQUIREMENTS
4.01 Withstand and closing Ratings
A. the CTTS/BPS is rated to close on and withstand the available RMS
symmetrical short circuit current at the CTTS/BPS terminals with the type of over
current protection shown on the plans.
8
B. the CTTS/BPS is UL listed in accordance with UL 1008 and is labeled in
accordance with that standard's 1.5 and 3 cycle, long-time ratings. CTTS/BPSs that are
not tested and labeled with 1.5 and 3 cycle (any breaker) ratings and have series, or
specific breaker ratings only, are not used.
4.02 Tests and certification
A. the complete CTTS/BPS is factory tested to ensure proper operation of the
individual components and correct overall sequence of operation and to ensure that the
operating transfer time, voltage, frequency and time delay settings are in compliance
with the specification requirements.
B. upon request, the manufacturer provides a notarized letter certifying
compliance with all of the requirements of this specification including compliance with
the above codes and standard, and withstand and closing ratings. The certification
identifies, by serial number(s), the equipment involved. No exceptions to the
specifications, other than those stipulated at the time of the submittal, are included in the
certification.
C. ASCO CTTS/BPS is certified to ISO 9001 international Quality Standard and
the manufacturer has third party certification verifying quality assurance in
design/development, production, installation and servicing in accordance with ISO 9001.
4.03 Service Representation
A. ASCO CTTS/BPS maintains a national service organization of companyemployed
personnel located throughout the contiguous United States. The service
center's personnel must be factory trained and must be on call 24 hours a day, 365 days a
year.
B. ASCO maintains records of each switch, by serial number, for a minimum of
20 years.
*Note: the following section is optional.
PART 5 OPTIONAL FEATURES.
5.01 POWER MANAGER.
1. Furnish power managers at locations shown to monitor all functions specified
below.
2. The Power manager is listed to UL 3111-1, CSA, CE Mark, and industrially
rated for an operation temperature range of -20 C to 60 C.
3. The power manager is accurate to 1% measured, 2% computed values and
display resolution to. 1%. Voltage and current for all phases are sampled simultaneously
to assure high accuracy in conditions of low power factor or large waveform distortions
(harmonics)
4. The power manager is capable of operating without modification at nominal
frequencies of 45 to 66 Hz and over a control power input range of 20 – 32VDC.
5. Each power manager is capable of interfacing with an optional
communications module to permit information to be sent to central location for display,
analysis, and logging.
6. The power manager accepts inputs from industry standard instrument transformers
(120 VAC secondary PT's and 5A secondary CTS) Direct phase voltage
connections, 600 VAC and under, is possible without the use of PT's
7. The power manager is applied in single, 3-phase, or three & four wire circuits.
A fourth CT input shall be available to measure neutral or ground current.
9
8. All setup parameters required by the power Manager are stored in non-volatile
memory and are retained in the event of a control power interruption.
9. The following metered readings are communicated by the power Manager, via
serial communication, when equipped with optional serial communications module:
a) Current, per phase RMS and neutral (if applicable)
b) Current Unbalance %
c) voltage, phase-to-phase and phase-to-neutral
d) voltage unbalance %
e) Real power (KW), per phase and 3-phase total
f) Apparent power (KVA), per phase and 3-phase total
g) Reactive power (KVAR), per phase and 3-phase total
h) power factor, 3-phase total & per phase
I) Frequency
j) Accumulated Energy, (MWH, MVAH, and MVARH)
The following energy readings are communicated by the power manager:
a) Accumulated real energy KWH
b) Accumulated reactive energy KVAH
c) Accumulated apparent energy KVARY
NOTE: For real and reactive energy reported values, separate total for energy flow
from each source is stored, including the arithmetic sum.
10. Power Manager Input/output Options.
a) Power managers are equipped with the following 1/O:
1) Provide (8) solid state status inputs.
2) Provide four (4) relay output contacts.
*Note: the following section is optional.
The power manager is flush mount to the enclosure.
1. The power managers are equipped with an optional continuous duty,
long-life, 4 line x 20 character LCD backlit display to provide local
access to the following metered quantities:
a) Current, per phase RMS and neutral (if applicable)
b) Current Unbalance %
c) voltage, phase-to-phase and phase-to-neutral
d) voltage unbalance %
e) Real power, per phase and 3-phase total
f) Apparent power, per phase and 3-phase total
g) Reactive power, per phase and 3-phase total
h) power factor, 3-phase total & per phase
I) Frequency
j) Accumulated Energy, (MWH, MVAH, and MVARH)
2. Display each of the power manager quantities is accomplished
through the use of menu scroll buttons.
3. For ease in operator viewing, the display remains on continuously,
with no detrimental effect on the life of the power manager.
4. Setup for system requirements is allowed from the front of the power
manager. Setup provisions shall include:
a) CT rating (xxxxx: 5)
b) PT rating (xxxxxxx: 120) (if applicable; 24000Vmaximum)
10
c) System type (single; three phase; 3 and 4 wire)
d) Communication parameters
5. Reset of the following electrical parameters are also allowed fromthe
front of the power manager:
a) Real energy (MWH), apparent energy (MVAH) and reactive
energy (MVARH)
6. All reset and setup functions are protected against
unauthorized/accidental changes.
End of Section 16495
Please note: This system will momentarily connect the emergency generator to the utility
during transfer. This usually necessitates obtaining approval from the uillty maintaining
frequncy within 0.2 HZ of nominal.
Division 16 – Electrical
Standby power generator systems
PART 1 GENERAL
1.01 Scope
A. Furnish and install automatic closed transiltion transfer & bypass-isolation
switch (CTTS/BPS) with number of poles, amperage, voltage, and withstand
current reting as shown on the plans. Each CTTS/BPS system (S) consists of
a colosed translion transfer switch and a tow-way bypass/isolation switch.
All CTTS/BPSS and control modules are the product of ASCO.
B. The CTTS/BPS transfers the load without interruption (closed transition) by
momrntaily connecting both sources of power only when both sourced are
present and acceptable. The maximum interconnection time is 100
milliseconds. The CTTS operates as a conventional break-before-make
(open transition) switch when the power source serving the load fils designs
that transfer in a delayed transition manner (intentional delay in the neutral
position) when closed transfer is bypassed are not used.
1.02 Codes and Standards
The automatic closed transition transfer & bypass-isolation switches and accessories
conforms to the requirments of:
A. UL 1008 – Standard for transfer switch equipment
B. ICE 947-6-1 Low-voltage switchgear and controgear; multifunction
equipment; automatic transfer switching equipment.
C. NFPA 70 – National electrcal code.
D. NFPA 99 – Essntail electrcal system for health care facilites.
E. NFPA 110 – emergency and standby power systems.
F. IEEE standard 446 – IEEE recommended practice for emergency and
standby power systems for commercical and industrial applications
G. NEMA standard ICS10-1993 (formerly ICS2-447) –AC automatic tranfer
switches.
H. UL 508 industrial control equipment.
2
PART 2 PRODUCTS
2.01 Mechanically held transfer switch
A. The transfer switch is electrivcally operated and mechancally held. The
electrical operator is a momentarilly energized, solenold menchanism.
Main operators that include overcurrent disconnect devices, linear motors
or gears are not used. The switch is mechanically interloced to ensure
only two possible positions, normal or emergency.
B. All transfer switch sizes use only one type of main operator for ease of
maintenance and commonality of parts.
C. The switch is positively locked and unaffected by momentary outages, so
that contact pressure is maintained at a constant value and contact
temperature rise is minmized for maximum reliability and operating life.
D. All main contacts are silver composition. Switches rated 600 amperes and
above are segmented, blow-on construction for high withstand and closeon
capability and be protected by separte arcing contacts.
E. Inspection of all contacts is possible from the switch without
disassembly of operating linkages and without disconnection of power
conductors. Switches rated 600 amps and higher have front removable
and replaceable contacts. All stationary and moveable contacts are
replaceable without removing power conductors and/or bus bars.
F. Designs utilizing components of molded-case circuit breakers,
contactors, or parts thereof, which are not inteded for continuous duty,
repptitive switching or transfer between two active power sources are
not used.
G. Where neutral conductors are to be solidly connected as shown on the
plans, a neutral conductor plate with fully reted AL-CU pressure
connectors is provided.
2.2 Bypass-Lsolation Switch
A. The two-way bypass-isolation switch provides manual bypass of the
load to either source and permit isloation of the automatic transfer
sweitch from all source and load power conductors. All main conctacts
are manually driven.
B. Power intrconnections are silver-plated copper bus bar. The only field
instahhed power connections are at the service and load terminals of the
bypass-isolation switch. All control inter-wiring is provided with
disconnect plugs.
C. Seprate bypass and isolation handles are utilized to provide clear distinction
between the functions. Handles are permanently affixed and operable
without opening the enclosure door. Desgns requiring insertion of loose
operating handles or opening of the enclosure door to operate are not used.
D. Bypass to the load-carrying source is accomplished with no interrupation of
power to the load (make before break contacts). Designs which disconnect
operating modes: "bypass to normal" automatic and bypass to emergency.
The operating speed of the bypass contacts are the same as the associted
transfer switch and are independent of the speed at which the manual handle
is operated. In the "Automatic" mode, the bypass contacts are out of the
3
power circuit so that will circuit so that they will not be subjected to fault
currents to which the system may be subjected.
E. The isolation handle provides three operatiog modes: "Closed" "Test"
and"Open." The "Test" mode permits testing of the entrie emergency power
system, including the automatic transfer switches with no interruption of
power to the load. The "Open" mode completely isolates the automatic
transfer switch from all source and load power conductors. When in the
"Open" mode, it is possible to completely withdraw the automatic transfer
switch for inspection or maintenance to conform to code requirments
without removal of power conductors or the use of any tools.
F. When the isolation switch is the "Test" or "Open" mode, the bypass switch
functios as a manual transfer switch.
G. Designs requiring operation of key interlocks for bypass isolation or ATSs
that cannot be completely withdrawn when isolated are not used.
2.3 Microprocessor Controller
A. The controller's sensing and logic is provided by a single built-in
microproessor for maximum reliability, minimum maintenance, and the
ability to communicate serially through an optional serial
communication module.
B. A single controller provides twelve selecable nominal voltage for
maximum apprlication flexibility and minimal spare part
requirements. Volatge sensing is the true RMS type and is accurate to
+- 1% of nominal voltage. Frequency sensing is accurste to +- 0.2%.
The panel is capable of oerating over a temperature range of -20 to +
60 degrees C and stroage from -55 to + 85 degrees C.
C. The controller is connected to the transfer switch by an interconnecting
wiring harness. The haraness includes a keyed disconnect plug to enable
the controller to be disconnected from the transfer switch for routine
maintenance. Sensing and control logic is on multi-layer printed circuit
boards.interfacing relays are industral grade plug-in type with dust
covers. The panel is enclosed with a protective cover and moiantenance.
The protective cover includes a built-in pocket for storage of the
operator's manuals.
D. All customer are wired to a common terminal block to simplify fieldwiring
connections.
E. The control meets or exceeds the requirments for electromagentic
compatibililty (EMC) as follows:
1. IEEE 472 (ANSI C37.90A) Ring Wave Test.
2. ENC55011 1991 Class A Conducted and Radiated Emission.
3. EN61000-4-2 Electrostatic Discharge Immunity, Direct Cotact & Air
Dischage.
4. EN61000-4-3 Radiated Electromagnetic Field Immunity.
5. EN61000-4-4 Eletrical Fast Transeint Immunity.
6. EN61000-4-5 Surge Immunity.
7. ENV50141 HF Conducted Disturbances Immunity.
4
2.04 Enclosure
A. The CTTS/BPS is furnished in a NEMA type 1 enclosure unless
otherwise shown on the plans.
B. All standard and optional door-mounted switches and pilot lights are
16-mm industrial grade type or equivalent for easy viewing &
replacement. Door controls are provided on a seprate removable plate,
which are supplied loose for open type units.
PART 3 OPERATION
3.01 Controller Display and Keypad
A. A four ;ine, 20 character LCD display and keypad are an integral part of
the controller for viewing all available data and setting desired operational
parameters. Operational parameters are also be available for viewing and
limited conrtol through the serial communications input port. The
following parametrs are only adjusatble via DIP swiches on the controller:
1. Norminal line voltage and frequency.
2. Single or three phase sensing.
3. Operating parameter protection.
4. Transfer operating mode configuation.
( Open transition, Closed transition or Delayed transition)
All insteuctions and controller settings are esily accessible, readable and
accomplished without the use of codes, calculation manuals.
3.02 Voltage, Frequency and phase Rotation Sensing
A. Voltage and frequency on both the normal and emergency sources (as
noted below) are continuously monitored, with the following pickup,
dropout and trip setting capabilities (values shown as % of nominal
unless otherwise specified):
Parameter Sources Dropout / Trip Pickup / Reset
Undervoltage N&E,30 70 to 98% 85 to 100%
Overvoltage N&E,30 102 to 115% 2% below trip
Underfrequncy N&E 85 to 98% 90 to 100%
Overfrequency N&E 102 to 110% 2% below trip
Voltage unbalance N&E 5 to 20% 1% below dropout
B. Repetitive accuracy of all seyyings are within +- 0.5% over an
operating temperature range of – 20C to 60C.
C. Voltage and frequency settings are field adjustable in 1% increments
either locally with the display and keypad or remotely via serial
communications port access.
D. The controller is capable (when activated by the keypad or through the
serial port) of sensing the phase rotation of both the normal and
emergency sources. The source is considered unacceptable if the
phase rotation is not the preferred rotation selected (ABC or CBA).
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E. Source ststus screens are provided for both normal and emergency to
provide digital readout of voltage on all three phases, frequency and
phase rotation.
3.03 Time Delays
A. An adjustable time delay of 0 to 6 seconds is provided to override momentary normal
source outages and dealy all transfer and engige starting signals. Providng an external 24
VDC power supply provides capability to extend this time dealy to 60 minutes.
B. A time delay is provided on transfer to emergency, adjustable from 0 to 60 minutes,
for controlled timing of transfer of loads to emergency.
C. An adjustable time delay of 0 to 6 seconds to override momentary emergency source
outage to delay all reeransfer signals during intial loading of engine generator set.
D. Two time delay modes (which are independently adjustable) are provided on retransfer
to normal. One time delay is for actual normal power filures and the other is for
the test mode function. The time delays are adjustable from 0 to 60 minutes. Time delay
is automatically bypassed if the emergency source fails and the normal source is
acceptable.
E. A time delay is provided on shut down of engine generator for cool down, adjustable
from 0 to 60 minutes.
F. A time delay is provated output signal is also provided to drive an extrenal relay(S)
for selective load disconnect control. The controller has the ability to activate an
adjustable 0 to 5 minute time delay in any of the following modes:
1. Prior to transfer only.
2. Prior to after transfer.
3.Normal to emergency only.
4.Emergency to normal only.
5.Normal to emergency and emergency to normal.
6. All transfer conditions or only when both sources are available.
G.The controller also includes the following built-in time delays for closed
transition transfer with Bypass-lsolation operation:
1. 1 to 5 minute time delay on failure to synchronize normal and emergency
sources prior to closed transition transfer.
2. 01 to 9.99 second time delay on an extended parallel condition of both power
sources during closed transition operation.
H. All time delays are adjustable in 1 second increments, except the extended
parallel time, which is adjustable in .01 second increments.
I. All time delays are adjustable by using the LCD display and keypad or with a
remote device connected to the serial communications port. The time delay
value displayed on the LCD or remote device is the remaining time until the
next event occurs.
3.04 Additional features
A. A three position momentary-type test switch is provided for the
test / automatic / reset modes. The test position simulates a
normal source failure. The reset position bypasses the time delays
on either transfer to emergency or retransfer to normal. Switches
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that require utilizing the keypad and display function or have no
manual time delay bypass means are not used.
B. A set of DPDT gold-flashed contacts rated 10 amps, 32 VDC is provided for a
low-voltage engine start signal. The start signal prevents dry cranking of the engine by
requiring the generator set to reach proper output, and run for the duration of the cool
down setting, regardless of whether the normal source restores before the load is
transferred.
C. Auxiliary contacts, rated 10 amps, 250 VAC are provided consisting of one
contact, closed
when the CTTS is connected to the normal source and one contact closed,
when the CTTS is
connected to the emergency source.
D. LED indicating lights (16mm industrial grade, type 12) are provided; one to
indicate when the CTTS is connected to the normal source (green) and one to indicate
when the CTTS is connected to emergency source (red).
E. LED indicating lights (16mm industrial grade, type 12) are provided and
energized by controller outputs. The lights shall provide true source availability of the
normal an emergency sources, as determined by the voltage sensing trip and reset
settings for each source.
The following features shall be built-in to the controller, but
capable of being activated through keypad programming or the
serial port only when required by the user:
F. provide the ability to select "commit/no commit to transfer" determine whether
the load should be transferred to the emergency generator if the normal source restores
before the generator is accept the load.
G. terminals are provided for a remote contact which opens to signal the CTTS to
transfer to emergency and for remote contacts which open to inhibit transfer to
emergency and/or retransfer to normal. Both of these inhibit signals are activated
through the keypad or serial port.
H. An in-phase monitor is provided in the controller. The monitor controls
transfer so that motor load inrush currents do not exceed normal starting currents, and
shall not require external control of power sources. The in-phase monitor is specifically
designed for and is the product of ASCO.
I. The controller is capable of accepting a normally open contact that allows the
transfer switch to function in a non-automatic mode using an external control device.
J. Engine Exerciser – the controller provides an internal engine exerciser. The
engine exerciser allows the user to program up to seven different exerciser routines. For
each routine, the user is able to:
1. Enable or disable the routine.
2. Enable or disable transfer of the load during routine.
3. Set the start time,
- Time of day
- Day of week
- Week of month (1st, 2nd, 3rd, 4th, alternate or every)
4. Set the duration of the run. At the end of the specified duration the switch
transfers the load back to normal and run the generator for the specified cool down
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period. A10-year life battery that supplies power to the real time clock in the event of a
power loss will maintain all time and date information.
K. System Status – the controller LCD display includes a "System Status"
screen which shall be readily accessible from any point in the menu by depressing the
"ESC" key a maximum of two times. This screen displays a clear description of the
active operating sequence and switch position. For example,
Normal failed
Load on normal
TD normal to emerge
2min 15s
Controllers that require multiple screens to determine system status or display
"coded" system status messages, which must be explained by references in the operator's
manual, are not used.
L. Self Diagnostics – the controller contains a diagnostic screen for the purpose
of detecting system errors. This screen provides information on the status input signals
to the controller which may be preventing load transfer commands from being
completed.
M. communication interface-the controller is capable of interfacing, through
an optional serial communication module, with a network of transfer switches, locally
(up to 4000 ft.) or remotely through modem serial communications. Standard software
specific for transfer switch applications is available by ASCO. This software allows for
the monitoring, control and setup of parameters.
N. Data logging – the controller has the ability to log data and to maintain the
last 99 events, even in the event of total power loss. The following events are time and
date stamped and maintained in a non-volatile memory:
1. Event logging
1. Date and time and reason for transfer normal to emergency.
2. Date and time and reason for transfer emergency t
3. Date and time and reason for engine start.
4. Date and time engine stopped.
5. Date and time emergency source available.
6. Date and time emergency source not available.
2. Statistical Date
1. Total number of transfers.
2. Total number of transfers due to source failure.
3. Total number of day's controller is energized.
4. Total number of hours both normal and emergency sources
are available.
O. Communications Module-A full duplex RS485 interface is installed in the
CTTS controller to enable serial communications. The serial communications is capable
of a direct connect or multi-drop configured network. This module allows for the
seamless integration of existing or new communications transfer devices. The serial
communication interface is called (ASCO Accessory 72).
PART 4 ADDITIONAL REQUIREMENTS
4.01 Withstand and closing Ratings
A. the CTTS/BPS is rated to close on and withstand the available RMS
symmetrical short circuit current at the CTTS/BPS terminals with the type of over
current protection shown on the plans.
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B. the CTTS/BPS is UL listed in accordance with UL 1008 and is labeled in
accordance with that standard's 1.5 and 3 cycle, long-time ratings. CTTS/BPSs that are
not tested and labeled with 1.5 and 3 cycle (any breaker) ratings and have series, or
specific breaker ratings only, are not used.
4.02 Tests and certification
A. the complete CTTS/BPS is factory tested to ensure proper operation of the
individual components and correct overall sequence of operation and to ensure that the
operating transfer time, voltage, frequency and time delay settings are in compliance
with the specification requirements.
B. upon request, the manufacturer provides a notarized letter certifying
compliance with all of the requirements of this specification including compliance with
the above codes and standard, and withstand and closing ratings. The certification
identifies, by serial number(s), the equipment involved. No exceptions to the
specifications, other than those stipulated at the time of the submittal, are included in the
certification.
C. ASCO CTTS/BPS is certified to ISO 9001 international Quality Standard and
the manufacturer has third party certification verifying quality assurance in
design/development, production, installation and servicing in accordance with ISO 9001.
4.03 Service Representation
A. ASCO CTTS/BPS maintains a national service organization of companyemployed
personnel located throughout the contiguous United States. The service
center's personnel must be factory trained and must be on call 24 hours a day, 365 days a
year.
B. ASCO maintains records of each switch, by serial number, for a minimum of
20 years.
*Note: the following section is optional.
PART 5 OPTIONAL FEATURES.
5.01 POWER MANAGER.
1. Furnish power managers at locations shown to monitor all functions specified
below.
2. The Power manager is listed to UL 3111-1, CSA, CE Mark, and industrially
rated for an operation temperature range of -20 C to 60 C.
3. The power manager is accurate to 1% measured, 2% computed values and
display resolution to. 1%. Voltage and current for all phases are sampled simultaneously
to assure high accuracy in conditions of low power factor or large waveform distortions
(harmonics)
4. The power manager is capable of operating without modification at nominal
frequencies of 45 to 66 Hz and over a control power input range of 20 – 32VDC.
5. Each power manager is capable of interfacing with an optional
communications module to permit information to be sent to central location for display,
analysis, and logging.
6. The power manager accepts inputs from industry standard instrument transformers
(120 VAC secondary PT's and 5A secondary CTS) Direct phase voltage
connections, 600 VAC and under, is possible without the use of PT's
7. The power manager is applied in single, 3-phase, or three & four wire circuits.
A fourth CT input shall be available to measure neutral or ground current.
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8. All setup parameters required by the power Manager are stored in non-volatile
memory and are retained in the event of a control power interruption.
9. The following metered readings are communicated by the power Manager, via
serial communication, when equipped with optional serial communications module:
a) Current, per phase RMS and neutral (if applicable)
b) Current Unbalance %
c) voltage, phase-to-phase and phase-to-neutral
d) voltage unbalance %
e) Real power (KW), per phase and 3-phase total
f) Apparent power (KVA), per phase and 3-phase total
g) Reactive power (KVAR), per phase and 3-phase total
h) power factor, 3-phase total & per phase
I) Frequency
j) Accumulated Energy, (MWH, MVAH, and MVARH)
The following energy readings are communicated by the power manager:
a) Accumulated real energy KWH
b) Accumulated reactive energy KVAH
c) Accumulated apparent energy KVARY
NOTE: For real and reactive energy reported values, separate total for energy flow
from each source is stored, including the arithmetic sum.
10. Power Manager Input/output Options.
a) Power managers are equipped with the following 1/O:
1) Provide (8) solid state status inputs.
2) Provide four (4) relay output contacts.
*Note: the following section is optional.
The power manager is flush mount to the enclosure.
1. The power managers are equipped with an optional continuous duty,
long-life, 4 line x 20 character LCD backlit display to provide local
access to the following metered quantities:
a) Current, per phase RMS and neutral (if applicable)
b) Current Unbalance %
c) voltage, phase-to-phase and phase-to-neutral
d) voltage unbalance %
e) Real power, per phase and 3-phase total
f) Apparent power, per phase and 3-phase total
g) Reactive power, per phase and 3-phase total
h) power factor, 3-phase total & per phase
I) Frequency
j) Accumulated Energy, (MWH, MVAH, and MVARH)
2. Display each of the power manager quantities is accomplished
through the use of menu scroll buttons.
3. For ease in operator viewing, the display remains on continuously,
with no detrimental effect on the life of the power manager.
4. Setup for system requirements is allowed from the front of the power
manager. Setup provisions shall include:
a) CT rating (xxxxx: 5)
b) PT rating (xxxxxxx: 120) (if applicable; 24000Vmaximum)
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c) System type (single; three phase; 3 and 4 wire)
d) Communication parameters
5. Reset of the following electrical parameters are also allowed fromthe
front of the power manager:
a) Real energy (MWH), apparent energy (MVAH) and reactive
energy (MVARH)
6. All reset and setup functions are protected against
unauthorized/accidental changes.
End of Section 16495
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