TSC 7320 Transfer Switch Controller
PM180 REV 0 23/02/10 Thomson Power Systems
40
MALFUNCTIONS PROBABLE CAUSES CORRECTIVE ACTIONS
Will not re-transfer to utility
source upon restoration
Utility Return Time (mains transient) delay
period in TSC 7320 has not yet expired.
Verify TSC 7320 time delay setting
A Load Test mode has been activated
locally or remotely
Check TSC 7320 load test LED status indicators
An Exercise Test mode has been activated
by the TSC 7320 scheduler
Check TSC 7320 status screen for Exercise Test is
active
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 7320 settings for
under/over voltage, voltage phase balance and
under/over frequency
TSC 7320 has incorrect utility voltage or
frequency settings for the ATS.
Re-Program TSC 7320 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 7320 Utility & Generator Voltage
Pages. If power cabling has non-matching phase
rotation, reverse power conductors on one phase on
one of the supplies
TSC 7320 utility voltage sensing
connection plug (38,39,40,41) is unplugged
Verify all TSC 7320 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 7320 has “Transfer Fail” alarm
activated.
Determine cause of alarm and rectify before resting
the alarm on TSC 7320
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 - 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
Defective TSC 7320 controller
Verify TSC 7320 has 24VDC control power applied to
the battery power input (1,2), then press and hold the
lamp test button, and ensure all 12 LED lights on the
front panel light up
If defective, return to Thomson Power systems using
RMA process
To Next Page
Loading...
