Thomson Power Systems TSC 900 User Manual

TS 970 Transfer Switch
PM163 REV 0 20/02/05 35 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 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
Faulty Power contactor unit
Refer to Power Contactor unit Troubleshooting
Section
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 Utility closed control contact
(J1-9)
• Verify TSC 900 SCU has SD Memory Card fully
inserted into socket.

Thomson Power Systems TSC 900 Specifications

General

Brand	Thomson Power Systems
Model	TSC 900
Category	Switch
Language	English