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TS 870 Transfer Switch
PM062 REV 11 16/04/19
54
Thomson Power Systems
MALFUNCTIONS
PROBABLE CAUSES
CORRECTIVE ACTIONS
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
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 Utility power switching unit close
coil (MO Style ATS Mechanism only)
Verify Utility power switching device close coil is fully
functional.
Defective generator power switching unit
trip coil (open transition) (MO Style ATS
Mechanism only)
Verify Gen power switching device trip coil is fully
functional. The generator power switching unit must
be open before the utility power switching device is
permitted to close (open transition).
Defective ATS mechanism motor (S or T-
Style ATS Mechanism only)
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
Содержание TS 870
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