Thomson Power Systems TSC 900 User Manual

TS 970 Transfer Switch
PM163 REV 0 20/02/05 36 Thomson Power Systems
If defective, return to Thomson Power systems using
RMA process
Faulty Power Contactor unit auxiliary
contact
Verify Generator & Utility auxiliary contacts are
operating correctly
Transfer Mode selector is not in “Auto”
position
Turn Transfer Mode selector to “Auto” position
Will not re-transfer to utility
source upon restoration (cont’d)
A Transfer Inhibit signal has been activated
Check TSC 900 indicators if a utility transfer inhibit
signal has been activated and reset)
Will not transfer to generator
source upon failure of utility
source
Warm-up time delay function has not timed
out yet
Verify TSC 900 timer setting
Generator set output circuit breaker which
feeds ATS is open
Close generator set output circuit breaker
Generator supply is not operating at correct
voltage or frequency levels.
Verify correct nominal levels the generator 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 generator voltage or
frequency settings for the ATS.
Re-Program TSC 900 with correct settings as required
for voltage or frequency.
Generator Phase Rotation may not match
Utility 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
TSC 900 connection plugs are unplugged
(J1,2,3,4)
Verify all TSC 900 connectors are fully inserted
ATS Power Chassis & Voltage Sensing
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 Power contactor unit close coil
Refer to Power Contactor unit Troubleshooting
Section
Defective Power contactor unit trip coil
Refer to Power Contactor unit Troubleshooting
Section

Thomson Power Systems TSC 900 Specifications

General

Brand	Thomson Power Systems
Model	TSC 900
Category	Switch
Language	English