TP-6461 1/0862 Section 4 Controller Test and Replacement
Note: If the standby source fails during a test, the ATS
will immediately attempt to transfer to the
preferred source.
Check the preferred source selection. 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.
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. Verify that the generator set master switch is in the
AUTO position.
3. Refer to Figure 4-7. From the main screen, press
the Test button. Enter the test password when
prompted and press OK.
4. Press the down arrow button to display Type of Test
Loaded.
5. Press the Start button.
6. Verify that the generator set starts and the Source
E Available LED lights.
7. 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. 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.
8. Press the End Test button.
9. 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. 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.
Note: The generator set may have an engine
cooldown time delay that causes the
generator set engine to run after the transfer
switch engine start signal is removed.
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