TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
Transfer to generator source
without a power failure in the
utility source
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 power switching device has tripped
open due to an over current condition and
TSC 900 “Transfer Fail” alarm is activated
on GHC.
Determine cause of alarm and rectify before TSC 900
is reset.
A loose control wire connection
Check all wiring connections in the ATS
Defective TSC 900 controller
-Verify TSC 900 is reading correct Utility Voltage or
frequency on GHC as compared to separate meter.
-If defective Return to Thomson Power Systems using
RMA process
Generator does not start or stop
when it should
Remote engine control panel is not set to
automatic mode
Verify remote engine control panel is set for automatic
operation
Engine start contact is wired incorrectly
from ATS to engine control panel
Verify engine start contact is wired correctly from ATS
to engine control panel
Incorrect TSC 900 Engine start contact is
used
For single engine applications, use Engine Start
Signal #2 contact on TSC 900 lower terminal block
(J10b)
TSC 900 Engine start contact terminal
block (j10b) is unplugged
Verify 2 position TSC 900 terminal block j10b is fully
inserted into controller and it is connected to correct
position (i.e. lower TB)
Defective TSC 900 SCU Engine Start
relay/contact
Verify Engine start signal LED diagnostic light is
illuminated on SCU when engine is signaled to start. If
LED is on, verify contacts are closing.
-If defective Return TSC 900 SCU to Thomson Power
Systems using RMA process
Engine Start and/or Cooldown timers may
be duplicated in both ATS control and
Engine Control Panel
Disable timers in either ATS or Engine control panel.
No time delay when there should
be
Incorrect TSC 900 time delay setting
Verify TSC 900 timer setting
Power is not available at the load
terminals but the utility or
generator power switching
device appears to be closed to a
live source
Utility or Generator power switching device
has tripped open due to an over current
condition.
Power Switching device must be reset by manually
operating the ATS mechanism to the other source,
then back to the source which was tripped.
Mechanism has failed to operate the power
switching device toggle far enough to close
the power switching unit.
Limit switch failure or improper adjustment. Contact
Thomson Power system for adjustment procedure of
limit switch
The transfer switch has
completed a transfer, but the
motor has overheated and the
internal thermal protector has
opened
Limit switch failure or improper adjustment
Contact Thomson Power system for adjustment
procedure or replacement of limit switch
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