Product Manual

TP-6946 3/16 51Section 6 Operation
6.3.1 Service Disconnect Procedure,
Service Disconnect to Emergency
The service disconnect switch has two positions: AUTO
and SERVICE DISCONNECT. Follow the procedures in
this section carefully and observe the safety precautions
when performing a service disconnect before
maintenance or service. Watch the LED indicators on
the ATS controller to check the ATS position and source
status during the procedures.
1. Move the service disconnect control switch located
on the door of the transfer switch to the SERVICE
DISCONNECT position.
2. The engine start contacts close, signaling the
generator set to start.
3. When the emergency source is available, the ATS
transfers to the emergency source.
Note: The generator set is now providing power to
the load.
4. Check that the utility breaker is open and the Utility
Disconnected light is illuminated.
5. Disconnect emergency power from the load by
opening the generator set circuit breaker and
disabling the generator set as follows:
a. Turn the generator set off by moving the
generator set master switch to the OFF/RESET
position or pressing the OFF button on the
generator set controller.
b. Disconnect power to the battery charger.
c. Remove the battery cables, negative (--) lead
first.
6. The Utility Disconnected light will turn off at this
point.
7. Use a voltmeter to verify that power is
disconnected before servicing connected
equipment.
8. Attach a safety lockout padlock to the service
disconnect control switch to prevent unauthorized
change in operating condition and verify transfer
switch door is locked closed. If the door is not
locked, turn and remove the door key.
6.3.2 Service Reconnect Procedure,
Service Disconnect to Emergency
Hazardous voltage.
Will cause severe injury or death.
Close and lock the transfer switch
enclosure door before connecting
power sources.
DANGER
Service reconnect procedure with Normal source
available
Do not return the generator set to service until after the
ATS transfers the load to the normal source, as
described in the procedure below.
1. Close the breaker between the generator and the
emergency side of ATS.
2. Remove the padlock from the service disconnect
control switch and move the service disconnect
switch to the AUTO position.
3. Reset faults on the controller, if necessary.
4. The ATS will transfer to normal source and open
the engine start contacts.
5. Verify that the ATS controller display shows normal
source available and ATS in normal position. The
Utility Disconnected light on the door should be off.
6. Return the generator set to service:
a. Reconnect the battery cables, negative lead
last.
b. Reconnect power to the battery charger.
c. Put the generator set back into auto mode by
moving the generator set master switch to the
AUTO position or pressing the AUTO button on
the generator set controller.