TSC 7320 Transfer Switch Controller
PM180 REV 0 23/02/10 Thomson Power Systems
41
Faulty Generator power switching device
auxiliary switch
Verify Generator side auxiliary switch (G-AUX) n/c
contact is closed and is low resistance when
Generator switching device is open. Verify TSC 7320
Digital input for Gen Power Switching Device is Open
has been activated
Will not re-transfer to utility
source upon restoration (cont’d)
On Service Entrance Rated ATS, Service
Disconnect switch is in the “De-Energized”
or “Transfer to Neutral” positions.
Switch to the Energized position
On Service Entrance Rated ATS, Utility
Voltage Disconnect switch inside ATS is
switched to “Off” position.
Switch Utility Voltage Disconnect switch to the “On”
position
Will not transfer to generator
source upon failure of utility
source
Will not transfer to generator
source upon failure of utility
source (con’t)
Warm-up time delay function has not timed
out yet
Verify TSC 7320 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 7320 Settings for
under/over voltage, voltage phase balance and
under/over frequency
TSC 7320 has incorrect generator voltage
or frequency settings for the ATS.
Re-Program TSC 7320 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 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 Generator voltage sensing
connection plug (34,35,36,37) 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 resetting
the alarm at TSC 7320
Defective ATS mechanism motor
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
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