TP-6126 8/0236 Section 4 Operation
4.3 Faults
4.3.1 Service Required LED
The following faults cause the Service Required LED to
flash, indicating that immediate service is required:
D Auxiliary switch fault
D Auxiliary switch open
D Failure to acquire standby source
D Failure to transfer
D Phase rotation fault
D Input/output module faults (see Section 6.5.1)
Find and correct the cause of the fault before trying to
reset the controller. The cause of the fault may be
shown by the other LEDs on the user interface; check
the Source Available, Position, Load Control, Time
Delay, Exercise, and Test LEDs to diagnose the cause of
the faults. If the LEDs do not reveal the cause of the fault
condition, connect a PC to the controller and use the
Setup Program to view the event history. The event
history lists fault conditions and transfers. See the
software operation manual for more information and
instructions.
After correcting the fault condition, press the Lamp Test
button for approximately 5 seconds until the LEDs flash
twice to clear the Service Required LED.
4.3.2 Auxiliary Switch Faults
An Auxiliary Switch Fault occurs if the controller cannot
determine the contactor switch position. The Service
Required LED flashes.
The fault clears when the controller can detect the
switch position. Depress the Lamp Test button until the
LEDs flash to clear the Service Required LED.
4.3.3 Failure to Acquire Standby
Source
A fault occurs if the unit attempts to start the generator
set but the standby source does not appear after the
Acquire Standby Source to Failure time delay. The
Service Required LED illuminates. Some conditions
that may cause this fault are failure of the generator set
to start, no voltage output from the generator, or an error
in sensing the voltage output from the generator set.
The fault clears when the system acquires a standby
source. Depress the Lamp Test button until the LEDs
flash to clear the Service Required LED.
4.3.4 Failure to Transfer
If the unit fails to transfer on command, the controller
waits 1 second and then initiates another 200 msec
attempt to transfer. If the in-phase monitor is operating,
the system waits 1 second and then begins monitoring
the source phases in preparation for transfer. When the
sources are in phase, the system attempts to transfer.
After three unsuccessful attempts to transfer, the
system stops attempting to transfer and generates a
fault. The Service Required LED illuminates.
The fault clears when the contactor transfers
successfully. Depress the Lamp Test button until the
LEDs flash to clear the Service Required LED.
4.3.5 Phase Rotation Faults
A fault occurs if the phase rotation of an input channel
does not match the system’s phase rotation direction
setting (ABC or CBA). The unit will not transfer to a
source if the source’s phase rotation does not match the
system setting. If the system detects a phase rotation
fault in the connected source, it attempts to transfer to an
alternate source that has the correct phase rotation.
The controller logs phase rotation faults in the event
history.
If the system detects phase rotation faults on both
sources, the Service Required LED lights. The system
does not transfer from the connected source.
4.4 Controller P ower Supply
The controller is powered by the sources connected to
the transfer switch. The “dark time” is that period of time
when neither source is available. During the dark time,
capacitors maintain the controller power for about 15
seconds. The capacitors require approximately one
hour to completely recharge after a power loss.
The controller’s time, date, and all controller settings,
including time delays, system parameters, pickups and
dropout settings, and input/output assignments, are
maintained by a controller battery during power
outages.
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