TP-6126 8/02
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Section 3 Setup and Test
16. Reconnect both power sources by closing the
circuit breakers or switches.
17. Move the generator set master switch to the AUTO
position.
Note:
If the engine cooldown time delay setting is
not set to zero (default setting), the
generator set may start and run until the
Time Delay Engine Cooldown (TDEC) ends.
18. Proceed to the automatic operation test.
3.7.3
Automatic Operation Test
Check the transfer switch’s automatic control system
immediately after the voltage check. The test sequence
simulates a loss of the normal source, starts the
generator set, and transfers the load to the emergency
source, executing all time delays that are set up to
operate during a loss of the normal source. When the
test is ended in step 7 of the procedure, the transfer
switch transfers the load back to the normal source and
removes
the
engine
start
signal,
executing
all
appropriate programmed time delays.
Refer to Section 4.2.2 for a description of the test
sequence of operation.
Note:
If the standby source fails during a test, the ATS
will immediately attempt to transfer to the
preferred source.
Optional Switches.
If the ATS is equipped with a
preferred source switch, check the switch position
before proceeding with the automatic operation test.
The test procedure assumes that Source N is the
preferred source.
If the transfer switch is equipped with a supervised
transfer switch, verify that it is set to the Auto position.
See Section 6 for more information about optional
switches.
Note:
Close and lock the enclosure door before starting
the test procedure.
Hazardous voltage.
Will cause severe injury or death.
Only authorized personnel should
open the enclosure.
DANGER
Automatic Operation Test Procedure
1. Check the controller LED indicators to verify that
the Position N and Source N Available indicators
are lit.
2. Press the lamp test button and check that all
controller LEDs illuminate.
3. Verify that the generator set master switch is in the
AUTO position.
4. Press the TEST button on the controller to start the
test. The TEST LED flashes to indicate that the
ATS controller is set up to transfer the load during
the test.
5. Verify that the generator set starts after the engine
start delay times out. Check that the Source E
Available LED lights.
6. Verify that the switch transfers the load to Source E.
a. Open-Transition
Models:
After
the
preferred-to-standby time delay, verify that the
Position N LED goes out and the Position E
LED lights, indicating that the switch has
transferred the load to Source E.
b. Programmed-Transition Models:
After the
preferred-to-off time delay, verify that the
Position N LED goes out and the Position OFF
LED lights. After the off-to-standby time delay,
check that the Position E LED lights, indicating
that the switch has transferred the load to
Source E.
7. Push the Test button to end the test.
8. Verify that the switch transfers the load back to
Source N.
a. Open-Transition
Models:
After
the
standby-to-preferred time delay, verify that the
Position E LED goes out and the Position N
LED lights, indicating that the switch has
transferred the load to Source N.
b. Programmed-Transition Models:
After the
standby-to-off time delay, verify that the
Position E LED goes out and the Position OFF
LED lights.
After the off-to-preferred time
delay, check that the Position N LED lights,
indicating that the switch has transferred the
load to Source N.
