TP-6487 8/07 15Section 2 Operation
2.4.1 Time Delays
The controller time delays are shown in Figure 2-6. For
adjustable time delays, install the accessory board. See
Section 4.1.
Description Time Delay
Engine Start 3sec.
Transfer from Normal to Standby 3sec.
Retransfer from Standby to Normal 5min.
Engine Cooldown 5min.
Exercise Time Duration 20 min.
Failure to Acquire Standby 75 sec.*
* Allows for three 15 sec. engine starting attempts separated by
15 sec. rest periods.
Figure 2-6 Time Delays
2.4.2 Load Control
The load control contact is closed when the transfer
switch is in the Normal position. The contact opens
when the Normal source is lost to allow disconnection of
a load. The load connected to the load control contact is
not powered by the standby source. The load control
step in the sequence of operation is shown in
Figure 2-4.
2.4.3 Load Shed
The optional load shed kit allows disconnection of
selected loads before transfer to the generator set.
Remote-controlled circuit breakers connected to the
optional load shed module(s) open before transfer to the
generator set. After transfer back to the utility source,
the remote-controlled circuit breakers close.
2.5 Faults
The LEDs on the controller’s user interface flash as
shown in Figure 2-2 to indicate various fault conditions.
Contact an authorized distributor/dealer for service if the
fault persists.
2.5.1 Failure to Acquire Standby
Source Warning
The Failure to Acquire Standby Source fault occurs if the
transfer switch does not sense voltage from the
generator set within 78 seconds after signalling the
generator set to start. Check the generator set
operation and the connections from the generator set to
the ATS in the case of this fault.
The Failure to Acquire Standby Time Delay is set for 78
seconds to match the crank cycle of the Kohler
generator set controller.
The fault clears when the system acquires the standby
source.
2.5.2 Failure to Transfer Warning
The Failure to Transfer warning occurs if a signal to
transfer is sent to the contactor and the position-
indicating contacts do not indicate a complete transfer.
The controller will attempt to transfer three times before
indicating the fault. If the transfer switch is in the Normal
position, the Engine Cooldown time delay is executed
and then the engine start contacts open to stop the
generator set.
Reset the controller to clear the fault condition. See
Section 2.6.
2.5.3 Auxiliary Switch Fault
An Auxiliary Switch fault occurs if the controller is unable
to determine the transfer switch position. If the transfer
switch is in the Normal position, the Engine Cooldown
time delay is executed and then the engine start
contacts open to stop the generator set.
Reset the controller to clear the fault condition. See
Section 2.6.
2.6 Controller Reset
2.6.1 Fault Reset
Always identify and correct the cause of a fault condition
before clearing the faults from the ATS controller. Press
and hold the Exercise and Test buttons for
approximately 3 seconds until the LEDs flash to clear all
faults and warnings. Warnings reset automatically with
a change in the source availability or a signal to transfer.
2.6.2 Alarm Silence
If the transfer switch is equipped with a time delay option
board, pressing both buttons for 3 seconds will also
silence the alarm horn.
2.6.3 Controller Reset
Press and hold both buttons for 6 seconds to reset the
controller to its original state at powerup.
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