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TP-6461 1/08 68 Section 4 Controller Test and Replacement
4.7 Engine Start
The engine start contacts should close when the Normal
source is lost and when the ATS controller starts a test or
exercise sequence.
The engine start contacts are
labeled with a decal. Check the Operation/Installation
Manual or the dimension drawing for the contact
location, if necessary.
Use the following procedure to check for continuity
across the engine start contacts when the Normal
source is disconnected and during a test sequence.
Allow time for the engine start and engine cooldown time
delays during the test.
Refer to the sequence of
operation in Sections 4.4 and 4.5 for the applicable time
delays.
Be sure to read and follow the safety precautions when
performing the test procedure.
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working
on the generator set.
Remove the negative (--) lead first
when
disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or connected equipment, disable the generator
set as follows: (1) Move the generator set master switch to the
OFF position. (2) Disconnect the power to the battery charger.
(3) Remove the battery cables, negative (--) lead first.
Reconnect the negative (--) lead last when reconnecting the
battery. Follow these precautions to prevent starting of the
generator set by an automatic transfer switch, remote
start/stop switch, or engine start command from a remote
computer.
Hazardous voltage.
Will cause severe injury or death.
Only authorized personnel should
open the enclosure.
DANGER
Testing live electrical circuits. Hazardous voltage or
current can cause severe injury or death. Have trained and
qualified personnel take diagnostic measurements of live
circuits. Use adequately rated test equipment with electrically
insulated probes and follow the instructions of the test
equipment manufacturer when performing voltage tests.
Observe the following precautions when performing voltage
tests: (1) Remove all jewelry. (2) Stand on a dry, approved
electrically insulated mat. (3) Do not touch the enclosure or
components inside the enclosure. (4) Be prepared for the
system to operate automatically.
(600 volts and under)
Engine Start Test Procedure
Start with the transfer switch in the Source N position.
1. Connect an ohmmeter or test lamp across the
engine start contacts at one of the following
locations:
a. Pins 8 and 9 of connector J1 (the transfer
switch harness-to-controller connection). See
Figure 4-13.
b. The engine start contacts on the transfer switch
contactor or field-connection terminal block.
See the decal on the transfer switch or the
transfer switch Operation and Installation
Manual for the engine start contact location.
c. The generator set engine start leads. See the
generator set documentation for engine start
lead identification and location.
2. Disconnect Normal power from the transfer switch
and verify that the engine start contacts close.
3. Reconnect Normal power to the transfer switch
and verify that the engine start contacts open after
applicable time delays.
4. If the engine start contacts do not operate as
indicated in steps 2 and 3 when power id
disconnected and reconnected, replace the ATS
controller’s power board. See Section 4.14.
5. Press the Test button to initiate a test sequence and
verify that the engine start contacts close.
6. Press the End button to end the test. Verify that the
engine start contacts open after the engine
cooldown time delay (which may be set to zero).
7. If the ATS engine start contacts do not close during
the Test Procedure, replace the ATS controller’s
logic board. See Section 4.14.