TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
9. TROUBLESHOOTING
A number of problems can cause the TSC 900 controller not to function properly. Refer to the
following list of typical problems. Consult the factory for any detailed information or for any problems
not listed.
CAUTION!!!
Before opening the enclosure to perform any service task, it is imperative to isolate the
transfer switch from any possible source of power. Failure to do so may result in serious
personal injury or death due to electrical shock.
Service procedures must be undertaken by qualified personnel only!
Will not re-transfer to utility
source upon restoration
Utility Return Time delay period in TSC 900
has not yet expired.
Verify TSC 900 time delay setting
A Load Test mode has been activated
locally or remotely
Check TSC 900 GHC Home Page status indicators
An Exercise Test mode has been activated
by the TSC 900 scheduler
Check TSC 900 GHC Scheduler page
Utility supply is not operating at correct
voltage or frequency levels.
Verify correct nominal levels the utility source should
be operating at and compare to TSC 900 settings for
under/over voltage, voltage phase balance and
under/over frequency
TSC 900 has incorrect utility voltage or
frequency settings for the ATS.
Re-Program TSC 900 with correct settings as required
for voltage or frequency.
Utility Phase Rotation is not matched with
Generator supply (first time transfer).
Check Generator & Utility Voltage Phase rotation
matches on TSC 900 GHC Utility & Generator Voltage
Pages. If power cabling has non-matching phase
rotation, reverse power conductors on one phase on
one of the supplies
Electrical interlock contact from Gen
(Source 2) Switching Device (GSD) To
TSC 900 controller is not working correctly
-Check TSC 900 Digital Input DI-09 is correctly
mapped as “Source 2 Power switching device Opened
-Check Digital input is correctly wired to Gen (Source
2) Switching Device “b” auxiliary contact
- -Check Gen (Source 2) Switching Device “b”
auxiliary contact is operating correctly (contact to be
closed when Switching Device is open)
TSC 900 connection plugs are unplugged
(J1,2,3,4)
Verify all TSC 900 connectors are fully inserted
AC Voltage Sensing or Control Isolation
plugs (PL12 or PL15) are unplugged
Verify both PL12 & PL15 connectors are fully inserted
TSC 900 has “Transfer Fail” alarm
activated.
Determine cause of alarm and rectify before TSC 900
is reset on GHC
Defective ATS mechanism motor
Verify motor does not rotate when 120VAC is applied
directly to motor leads. If defective Return to Thomson
Power systems using RMA process
A loose control wire connection
Check all wiring connections in the ATS
Defective TSC 900 controller
-Verify TSC 900 has 120Vac control power applied to
the utility control power input (J1- 15, 16) and
Diagnostic green LED is flashing.
- Verify TSC 900 has 120Vac control power applied to
the ATS control contacts (J1-9)
-Verify TSC 900 SCU has SD Memory Card fully
inserted into socket.
If defective Return to Thomson Power systems using
RMA process
Faulty motor limit switch
Verify Utility side limit switch (ULS) n/c contact is
closed and is low resistance when ATS mechanism is
not in the utility position.
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