THOMSON TSC 80E - V2.2 User manual

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TSC 80e
TRANSFER SWITCH CONTROLLER
INSTALLATION, OPERATING &
SERVICE MANUAL
Software Version 2.2
PM091 Rev 1 09/02/27

TSC 80e TRANSFER SWITCH CONTROLLER
PM091 Rev 1 09/02/27 Thomson Technology
TABLE OF CONTENTS
1. INTRODUCTION 1
1.1. PRODUCT REVISION HISTORY 1
1.2. GENERAL INFORMATION 2
1.3. NOTES TO TRANSFER SWITCH INSTALLER 2
1.3.1. SYSTEM VOLTAGE 2
1.3.2. SYSTEM PHASING - HIGH LEG DELTA SYSTEMS 3
1.3.3. REMOTE START CONTACT FIELD WIRING 4
1.3.4. DIELECTRIC TESTING 4
2. DESCRIPTION 5
2.1. LEXAN FACEPLATE 5
2.2. PRINTED CIRCUIT BOARD 7
2.2.1. TERMINAL BLOCKS 8
2.2.2. DIAGNOSTIC LED’S 8
2.3. TSC 80e CONTROLLER FEATURES 9
2.4. APPLICATION INFORMATION 11
2.4.1. AC VOLTAGE SENSING INPUT 11
2.4.2. AC CONTROL POWER INPUT 13
2.4.3. OUTPUTS 13
3. OPERATING INSTRUCTIONS 14
3.1. AUTOMATIC SEQUENCE OF OPERATION 14
3.1.1. NORMAL OPERATION 14
3.1.2. ABNORMAL OPERATION 15
3.2. TEST MODES 17
3.2.1. UTILITY POWER FAIL SIMULATION (LOAD TEST) 17
3.2.2. AUTOMATIC PLANT EXERCISE TEST 18
3.2.3. FOUR FUNCTION REMOTE TEST (FTS4 OPTION) 19
3.2.4. REMOTE TEST 20
3.3. TRANSFER FAIL FAULT RESET 20
3.4. LAMP TEST 21
3.5. TIMER BYPASS 21
3.6. TSC 80e LCD DISPLAY OPERATION 22
3.6.1. LCD DISPLAY SCREENS 22
3.6.2. LCD DISPLAY MODE OPERATION 25
3.6.3. SYSTEM STATISTICS 25

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3.6.4. DATALOG MENU 26
4. TSC 80E SOFTWARE PROGRAMMING INSTRUCTIONS 27
4.1. PASSWORDS 27
4.1.1. USER READ (VIEW ONLY MODE) 27
4.1.2. USER READ / WRITE MODE 27
4.1.3. MASTER READ / WRITE MODE 27
4.1.4. PASSWORD ENTRY PROCEDURE 28
4.2. SOFTWARE PROGRAMMING PROCEDURE 28
4.3. PROGRAMMING DISPLAY MAIN MENU SCREENS 30
4.4. QUICK GUIDE VOLTAGE CHANGE PROGRAMMING PROCEDURE 31
4.5. QUICK GUIDE PROGRAMMABLE OUTPUTS PROGRAMMING PROCEDURE 32
4.6. PROGRAMMING DISPLAY SUB-MENU DESCRIPTIONS 33
4.6.1. PASSWORD ENTRY & RESET 33
4.6.2. SYSTEM DATE & TIME 34
4.6.3. AUTO EXERCISE TIMER 34
4.6.4. SYSTEM OPTIONS 36
4.6.5. SYSTEM CONFIG 36
4.6.6. VOLTAGE CALIBRATION 41
4.6.7. UTILITY VOLTAGE SETPOINTS 44
4.6.8. GENERATOR VOLTAGE & FREQUENCY SETPOINTS 45
4.6.9. SYSTEM TIMING DELAYS 45
4.6.10. PROGRAMMABLE OUTPUTS 47
4.6.11. SYSTEM STATISTICS 50
4.6.12. DATALOGS 51
4.7. TSC 80e FACTORY DEFAULT PROGRAMMING SETTINGS 52
5. TSC 80E TYPICAL CONNECTION DIAGRAM 53
6. TSC 80E SPECIFICATIONS 54
7. TROUBLESHOOTING 55
8. TSC 80E REPLACEMENT PARTS 56
9. PRODUCT RETURN POLICY 57
10. NOTES 58

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1. INTRODUCTION
1.1. PRODUCT REVISION HISTORY
The following information provides an historical summary of changes made to this product
since the original release.
Software Version
2.2 09/02/27 Software revised for TSC 80 Controllers. No changes to TSC 80e
Controller features or operation.
2.1 09/01/21 Software updated to incorporate Configurable PT Ratio for 3 phase,
3 wire applications
2.0 08/08/14 Original software release for TSC 80e
Operating & Service Manual Version
Rev 0 09/01/19 Original release of dedicated Manual for TSC 80e
Contact Thomson Technology, to obtain applicable instruction manuals. Soft copy of most
current version is available at www.thomsontechnology.com.

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1.2. GENERAL INFORMATION
NOTE:
Installations should be done in accordance
with all applicable electrical regulation
codes as required.
The following information is provided for general information only pertaining to TSC
80e Transfer Switch Controllers installed in a Thomson Technology Automatic
Transfer Switch as applied in a typical site installation. For specific site installation
information, consult Thomson Technology as required.
CAUTION
contents subject to damage by
STATIC ELECTRICITY
This equipment contains static-sensitive parts. Please observe the following anti-static
precautions at all times when handling this equipment. Failure to observe these
precautions may cause equipment failure and/or damage.
• Discharge body static charge before handling the equipment (contact a grounded
surface and maintain contact while handling the equipment, a grounded wrist strap
can/should also be utilized).
• Do not touch any components on the printed circuit board with your hands or any
other conductive equipment.
• Do not place the equipment on or near materials such as Styrofoam, plastic and
vinyl. Place the equipment on grounded surfaces and only use an anti-static bag
for transporting the equipment.
1.3. NOTES TO TRANSFER SWITCH INSTALLER
1.3.1. SYSTEM VOLTAGE
If the transfer switch has programmable/multi-tap system voltage capability (refer to
electrical schematic), confirm the transfer switch has been configured for the correct

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system voltage. If the transfer switch requires reconfiguring, the TSC80e controller will
require re-programming as well.
WARNING
Failure to confirm and match transfer
switch voltage with the system voltage
could cause serious equipment damage.
1.3.2. SYSTEM PHASING - HIGH LEG DELTA SYSTEMS
When the transfer switch is connected to a 3-phase 4-wire delta systems, the “High”
leg (Phase B, colored Orange), must be connected to Phase B of the Utility and/or
Generator supply. This will ensure the ATS control power, which is internally
connected between Phase A and Neutral is maintained at 120VAC. Refer to figure
below for further details.
WARNING
Failure to match correct system phasing
will result in serious damage to the
TSC 80e controller.
208V
B
(O range)
(High Leg)
C
(Yellow)
A
(R ed)
N
(W hite)
PH A
(UA)
Automatic Transfer
Switch (Utility Supply)
PH B
(UB)
PH C
(UC)
Neural
(N)
120V 120V
240V 240V

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CAUTION!!!
All installation and/or service work performed must be done by qualified
personnel only. Failure to do so may cause personal injury or death.
1.3.3. REMOTE START CONTACT FIELD WIRING
As a minimum, the remote engine start control field wiring shall conform to the local
regulatory authority on electrical installations. Field wiring of a remote start contact
from a transfer switch to a control panel should conform to the following guidelines to
avoid possible controller malfunction and/or damage.
1.3.3.1.Minimum #14 AWG (2.5mm2) wire size shall be used for distances up to
100ft (30m)1). For distances exceeding 100 ft. (30m) consult Thomson
Technology.
1.3.3.2.Remote start contact wires should be run in a separate conduit.
1.3.3.3.Avoid wiring near AC power cables to prevent pick-up of induced
voltages.
1.3.3.4.An interposing relay may be required if field-wiring distance is
excessively long (i.e. greater than 100 feet (30m)) and/or if a remote
contact has a resistance of greater than 5.0 ohms.
1.3.3.5.The remote start contact provided is voltage free (i.e. dry contact).
Refer to the “TSC 80e Typical Connection Diagram” on page 52 for
terminal interface and contact voltage/current ratings or page 13 for
specifications on output contact ratings. Applying voltage or current in
excess of the ratings will damage the controller and is not cover by
Thomson Technology’s limited warranty.
1.3.4. DIELECTRIC TESTING
Do not perform any high voltage dielectric testing on the transfer switch with the
TSC80e controller connected into the circuit, as serious damage will occur to the
controller. All AC control fuses and control circuit isolation plugs connected to the
TSC80e must be removed if high voltage dielectric testing is performed on the transfer
switch.

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2. DESCRIPTION
The TSC 80e controller utilizes microprocessor-based design technology, which provides high
accuracy for all voltage sensing and timing functions. The TSC 80e is factory configured to control all
the operational functions and display features of the automatic transfer switch.
The TSC 80e controller consists of two parts; a Lexan faceplate, which is mounted externally on the
transfer switch door, and a printed circuit board (PCB), which is mounted inside the transfer switch on
the enclosure door. The TSC 80e PCB contains a built-in LCD display that is visible from the front
panel faceplate. The Lexan faceplate contains operation/data-acquisition/programming pushbuttons
and indication LEDs.
2.1. LEXAN FACEPLATE
The TSC 80e Controller Lexan faceplate is shown as in FIGURE 1. The Lexan pushbuttons
and LED lights are connected to the main PCB via plug-in ribbon cable. The main features of
the Lexan faceplate are described as follows with reference to FIGURE 1.
Utility Supply Available LED light
Load on Utility supply LED light
Load on Generator supply LED light
Generator Supply Available LED light
ATS Load Bus Energized LED light
Utility Power Fail Test Mode Pushbutton (Program value DECREMENT/DOWN Pushbutton) & LED light
 Auto Generator Exercise Mode Pushbutton (Program value INCREMENT/UP Pushbutton) & LED light
LCD Display Screen Viewing Window
Programming Escape/Data Log review Pushbutton
Programming Enter Pushbutton

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FIGURE 1 - TSC 80e Controller Lexan Faceplate
• ESC pushbutton. The ESC function is used to “ESCAPE” or exit the last field or
programming menu. The program menu is a drill down format; by pressing the
ESC button the program steps back one layer at a time until it escapes/exits
the program menu. The ESC function can also be used to view the controllers
Data Logs that are stored.
• DOWN pushbutton. The DOWN function is used to change or decrement
values while in the programming mode and is used to scroll down through the
status menus or programming sub menus to the next item.

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• UP pushbutton. The UP function is used to change or increment a
programming value while in the programming mode and is used to scroll up
through the status menus or programming sub menus to the previous item.
• ENTER pushbutton. The ENTER function is used to access the Program
menus and “enters” and accept new programming or operating mode changes
after a new value has been selected.
2.2. PRINTED CIRCUIT BOARD
TB2-5
TRANSFORMER
10
9 8 7 6 5 4 3 2 1
1
11
28
TRANSFORMER
44
38
TB1
TB7
SYS OK
XFER UTIL
XFER GEN
LD ON GEN
(PROG 4)
LD ON UTIL
(PROG 5)
ENG STOP
29
37
PROG 2
PROG 3
PROG 1
TB6
BT1
REAL TIME
CLOCK
BATTERY
FIGURE 2
The printed circuit board (PCB) is shown in FIGURE 2. The PCB contains the following user
interface items:

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2.2.1. TERMINAL BLOCKS
Terminal blocks are located on the PCB as follows:
TB1 High voltage sensing terminal block (120-600VAC).
WARNING
Voltage sensing circuits are capable of lethal voltages while
energized. Standard safety procedures should be followed and
be performed by qualified personnel only. Failure to do so may
cause personnel injury and/or death.
TB2-TB6 Transfer control terminal block for 120VAC control power and input/output
circuits.
TB7 Low voltage control inputs (5VDC internally powered, switched to terminal
38).
2.2.2. DIAGNOSTIC LED’S
The TSC 80e controller provides diagnostic LED lights, which are mounted on the
printed circuit board as per FIGURE 2. Their functions are described as follows:
SYS OK LED flashes on and off at irregular intervals, which indicates
the microprocessor is functioning normally.
XFER TO UTILITY LED illuminates whenever the TSC 80e is initiating a signal
to transfer to the Utility supply. (UP transfer contact as noted
on the electrical schematic is closed)
XFER TO GEN LED illuminates whenever the TSC 80e is initiating a signal
to transfer to the Generator supply. (GP transfer contact as
noted on the electrical schematic is closed)
ENG STOP LED illuminates whenever the TSC 80e is initiating an
ENGINE STOP (remote start contact is open).
PROG 1 LED illuminates whenever the Programmable output Relay
#1 is turned on (relay on the circuit board is energized).
PROG 2 LED illuminates whenever the Programmable output Relay
#2 is turned on (relay on the circuit board is energized).
PROG 3 LED illuminates whenever the Programmable output Relay
#3 is turned on (relay on the circuit board is energized).

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LD ON GEN (PROG 4) LED illuminates whenever the Programmable output Relay
#4 is turned on (relay on the circuit board is energized).
Factory default function is “Load on Gen”.
LD ON UTIL (PROG 5) LED illuminates whenever the Programmable output Relay
#5 is turned on (relay on the circuit board is energized).
Factory default function is “Load on Utility”.
2.3. TSC 80e CONTROLLER FEATURES
The Thomson Technology TSC 80e Transfer Switch Controller utilizes the latest
advancements in microprocessor technology, printed circuit board assembly and software for
control of automatic transfer switches. The TSC 80e is the second generation of
microprocessor-based transfer switch controllers from Thomson Technology, and reflects over
30 years of transfer switch control experience. The TSC 80e is factory configured to monitor,
display and control all operational functions of the automatic transfer switch. All voltage
sensors and timers are fully user adjustable utilizing software configuration. The
microprocessor design provides high accuracy for all voltage sensing and timing functions as
well as providing many standard features.
• Utility AC voltage sensing (true RMS) – 120-600V single phase or 3 phase
• Generator AC voltage sensing (true RMS) – 120-600V single phase or 3 phase
• Generator AC frequency sensing
• Utility under voltage control setpoint 70 - 95% (adjustable)
• Generator under voltage control setpoint 70 - 95% (adjustable)
• Generator under frequency control setpoint 70 - 90% (adjustable)
• Engine warm-up timer 0-60 sec. (adjustable)
• Utility return timer 0-30 min. (adjustable)
• Engine start timer 0-60 sec. (adjustable)
• Engine cooldown timer 0-30 min. (adjustable)
• Neutral position delay timer 0-60 sec. (adjustable)
• Local utility power fail simulation test pushbutton & LED, door mounted
• Remote utility power fail simulation test pushbutton input (via terminal block)
• Load on utility supply & load on generator supply LED’s, door mounted
• Utility and generator source available LED’s, door mounted
• Weekly plant exercise timer (30 min. on load) manually initiated

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• Local plant exercise initiate pushbutton & LED, door mounted
• Engine start contact (10A, 120/240VAC resistive max.)
• Transfer fail/forced transfer logic
• Automatic force transfer to alternate supply should load voltage become de-
energized
• 50 or 60Hz capable (120V control power)
• Remote Load Test/Peak Shave Input
• LCD Display: Built-in, front faceplate mounted LCD Display for monitoring 3
phase Utility/Generator voltage, system frequency and timer countdown
operation
• Front Panel Programming: All controller set points can be programmed using
built-in faceplate mounted pushbuttons & LCD display with password security
• Load Disconnect Contact (LDC): Integrated Load Disconnect Contact (LDC)
feature provides pre/post transfer control to signal external building systems
such as elevators during transfer operations
• Generator Exercise Timer (EXT): Integrated Generator Exercise Timer (EXT)
with easy to use 4 event, 7-14-21-28 Day, On-load or Off-load Programmability
• Real-time Clock: On Board Real-time clock c/w battery back-up & daylight-
savings programming functionality
• Event Data Logging: Data logging of key events including total transfers to
generator, total utility power failures, load on utility hours, load on generator
hours and utility or generator voltage/ frequency data at time of fault
• 5 Programmable Output Contacts: Additional Programmable Output Contact
rated 10A, 120/240V resistive, Form C with the following available functions:
Fail to Transfer, Load on Utility, Load on Gen, Utility Power Available (UPA),
Generator Power Available (GPA), ATS Not in Auto, ATS in Auto, Transfer to
Gen, Transfer to utility, Switch failure, and limit switch failure.

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2.4. APPLICATION INFORMATION
2.4.1. AC VOLTAGE SENSING INPUT
The TSC 80e can accept direct AC voltage sensing inputs on the generator and utility
supplies from 120-600VAC (nominal). Note: Direct input voltage sensing can only be
used when the system utilizes a 3 phase, 4 wire distribution system which has the
neutral conductor solidly grounded. For 3 phase, 3 wire systems (i.e. no neutral) or
high voltage systems, potential transformers must be used. Refer to FIGURE 3 for
voltage sensing connections.

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TSC 80e
1
2
3
25
26
24
VOLTAGE INPUTS
600VAC L-L, 347VAC L-N
480VAC L-L, 277VAC L-N
380VAC L-L, 220VAC L-N
208VAC L-L, 120VAC L-N
PT REQUIRED FOR TRANSFER SWITCH MECHANISM POWER
(MUST BE SIZED TO SUIT POWER REQUIREMENTS).
NOTE: UTILITY VOLTAGE SENSING AND
CONTROL POWER SHOWN ONLY.
BA C N
GRD
GRD
120
GRD
3Ø, 4W 208/380/480/600VAC DIRECT SENSING
VOLTAGE INPUTS
240VAC L-L, 120VAC L-N
NOTE: UTILITY VOLTAGE SENSING SHOWN ONLY.
TSC 80e L2L1 N
1
2
3
10
25
24
GRD
GRD
26
NO CONNECTION
SINGLE PHASE, 3W 120/240VAC DIRECT SENSING
1
2
3
25
26
24
NOTE: UTILITY VOLTAGE SENSING AND CONTROL POWER SHOWN ONLY.
BA C N
GRD
GRD
120V
NOTE: FOR HIGH LEG DELTA SYSTEMS PHASING OF CUSTOMER SUPPLY MUST
BE CONNECTED AS SHOWN ABOVE. FAILURE TO COMPLY WILL RESULT IN DAMAGE
TO CONTROLLER.
A
B C
N
3Ø, 4W 120/240V HIGH LEG DELTA DIRECT CONNECTION
TSC 80e
SECONDARY PT VOLTAGE
120VAC L-L [NO NEUTRAL]
NOTE: ØB IS GROUNDED
TSC 80e BA C
1
2
3
25
26
24
GRD
120
120
120
PT REQUIRED FOR TRANSFER SWITCH MECHANISM POWER
(MUST BE SIZED TO SUIT POWER REQUIREMENTS).
NOTE: UTILITY VOLTAGE SENSING SHOWN ONLY.
GRD
GRD
3Ø, 3W DELTA PT's
TSC80e CONTROLLER MUST BE PROGRAMMED FOR CORRECT
PT RATIO AND SECONDARY PT VOLTAGE IN SOFTWARE
1
2
21
1
1
FIGURE 3

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2.4.2. AC CONTROL POWER INPUT
The TSC 80e is factory supplied for 120VAC (nominal) control power input voltage.
Independent AC control power is required from both utility and generator supplies. AC
control power is utilized for internal TSC 80e control circuits and external control
device loads. The TSC 80e requires approximately 6 VA power for internal control
circuits. The maximum external load is limited by output contact ratings (i.e. 10A
resistive, 120VAC). Total AC control power requirements for each supply must be
determined by adding both internal and external load requirements.
2.4.3. OUTPUTS
The TSC 80e provides the following types of output circuits:
Engine Start Contact Isolated Form B contact (10A, 120VAC Resistive)
Transfer to Utility Output 120VAC, 10A (Resistive) powered output contact
Transfer to Generator Output 120VAC, 10A (Resistive) powered output contact
The TSC 80e provides the following additional output circuits:
Programmable Output
Contact #1
Isolated Form C contact (10A, 120VAC/250VAC
Resistive)
Programmable Output
Contact #2
Isolated Form C contact (10A, 120VAC/250VAC
Resistive)
Programmable Output
Contact #3
Isolated Form C contact (10A, 120VAC/250VAC
Resistive)
Programmable Output
Contact #4
Isolated Form C contact (10A, 120VAC/250VAC
Resistive)
Programmable Output
Contact #5
Isolated Form C contact (10A, 120VAC/250VAC
Resistive)
Interposing relays are required between the TSC 80e outputs and the end device if
loads exceed the output current rating.

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3. OPERATING INSTRUCTIONS
To operate the TSC 80e controller and associated transfer switch using the front faceplate
pushbuttons, refer to the following detailed operating instruction sub-section descriptions.
3.1. AUTOMATIC SEQUENCE OF OPERATION
3.1.1. NORMAL OPERATION
Under normal operating conditions, the transfer switch operates automatically during a
failure and restoration of utility power and does not require operator intervention.
When utility supply voltage drops below a preset nominal value (70 - 95% of rated
adjustable) on any one phase, an engine start delay will be initiated and the transfer to
utility supply signal will be removed (i.e. contact opening). Following expiry of the
engine start delay period (0 - 60 sec. adjustable) an engine start signal will be given
(contact closure, relay drops out to initiate start sequence).
Once the engine starts, the transfer switch controller will monitor the generators
voltage and frequency levels. When the generator voltage and frequency rises above
preset values (70 - 95% nominal adjustable) the Engine Warm-up timer will be
initiated. After the Engine Warm-up timer expires (0-60 sec. Adjustable), the transfer to
generator supply signal (contact closure) will be given to the transfer switch
mechanism. The load will then transfer from the utility supply to the generator supply
via motor driven mechanism (Neutral Delay is bypassed on utility failure detection).
The generator will continue to supply the load until the utility supply has returned and
the retransfer sequence is completed as follows: When the utility supply voltage is
restored to above the present values (70 - 95% of rated adjustable) on all phases, a
transfer return delay circuit will be initiated. Following expiry of the utility transfer
return timer (0 - 30 min. adjustable), the transfer to generator supply signal will be
removed (contact opening), then the transfer to utility supply signal (contact closure)
will be given to the transfer switch mechanism. The load will then be transferred from
the generator supply back to the utility supply. During the utility re-transfer sequence a
neutral positioning delay circuit will cause the transfer mechanism to pause in the
“neutral position (i.e. with both transfer power switching devices open) for the duration
of the neutral delay timer (0-30 seconds adjustable) setting. Once the neutral delay
expires, the re-transfer sequence will be completed.

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An engine cooldown timer circuit will be initiated once the load is transferred from the
generator supply. Following expiry of the cooldown delay period (0 - 30 min.
adjustable) the engine start signal will be removed (contact opening) to initiate
stopping of the generator set.
3.1.2. ABNORMAL OPERATION
3.1.2.1.TEST CONDITION
A test pushbutton on the transfer switch shall signal a simulated utility power
fail signal to the transfer switch controller. The transfer switch shall operate as
per a normal utility power fail condition. The neutral delay circuit logic will be
active during transfer to and from the generator supply (i.e. when both sources
of power are available).
The transfer switch shall remain on generator supply until the test mode is
terminated. It will then retransfer back to the utility supply following expiry of
the transfer return timer and then continue to operate the generator set for its
cooldown period then stop.
3.1.2.2.GENERATOR FAILURE ON LOAD
Should the generator set fail while on load, the transfer switch shall retransfer
the load back to the utility supply if within nominal limits. The utility return and
neutral delay timers will be bypassed in this condition.
NOTE
This operating condition shall apply to a normal utility failure as
well as any test condition.
3.1.2.3.TRANSFER SWITCH FAIL ALARM LOGIC
The TSC 80e controller contains logic to detect a transfer mechanism failure.
Should a failure be detected, a forced transfer to the alternate supply will be
initiated. Detailed logic operation is as follows:
NOTE
Disabling of the “TRANSFER SWITCH FAIL” feature is possible
by selecting the “Disconnected” position on “Service Entrance
Models” or by a closure between terminals 38 & 42 on the TSC
80e. In these situations the TSC 80e controller will not verify
that the transfer mechanism has operated correctly to provide
power to the load bus.

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3.1.2.4.TRANSFER FAIL DETECTION-NORMAL STEADY STATE
CONDITION (NON-TRANSFERRING)
i. Limit Switch Failure (i.e. open contact) - Transfer Fail Alarm is initiated
(Load on Source Flashing LED) after a 9-second delay, and then a forced
transfer to the alternate source is initiated, if valid and available. Re-
transfer back to the original source will not occur until the Transfer Fail
alarm condition is reset. Refer to item 3.3 for Transfer Fail Fault Reset
details.
ii. Loss of Load Voltage (<80VAC) (i.e. Power switching device Tripped or
Failed to Close/Conduct Condition) - Transfer Fail Alarm is initiated (Load
Source Flashing LED) after a 5-second delay, then a forced transfer to the
alternate source is initiated, if valid and available. Re-transfer back to the
original source will not occur until the Transfer Fail alarm condition is reset.
Refer to item 3.3 for Transfer Fail Fault Reset details.
iii. Limit Switch Failure & Loss of Load Voltage <80VAC - Transfer Fail Alarm
is initiated (Load Source Flashing LED) after an 11-second delay, then a
forced transfer to the alternate source is initiated, if valid and available. Re-
transfer back to the original source will not occur until the Transfer Fail
alarm condition is reset. Refer to item 3.3 for Transfer Fail Fault Reset
details.
3.1.2.5.TRANSFER FAIL DETECTION - TRANSFERRING CONDITION
Transfer Source to Neutral – “NEUTRAL POSITION TIME” (10 seconds-
adjustable) starts timing as soon as a transfer to the alternate source is
initiated. During this period the ATS motor is energized and moves the
mechanism from the original source to neutral. The power to the motor will be
de-energized when either the “NEUTRAL POSITION TIME” times out or the
load voltage drops below 80VAC on all phases (whichever occurs first). Once
the ATS motor is de-energized, the Neutral Delay timer starts timing (all other
timers are halted while neutral delay timer is running). Once the Neutral Delay
timer expires the motor is re-energized to continue the transfer (see below).
Note: Normally the load voltage will typically drop below the 80VAC setpoint
within 1 second when the source power-switching device opens and therefore
the “NEUTRAL POSITION TIME” never times out. The default setting of this
timer (10 seconds) is intentionally set long so that it will not pre-maturely stop
the ATS mechanism.