TP-6447 10/12 23Section 3 Functional Tests
Section 3 Functional Tests
3.1 Introduction
Be sure to perform all of the functional tests described in
this section before putting the transfer switch into
operation.
The functional tests include the following checks:
D Manual Operation Test
D Voltage Checks
D Lamp Test
D Automatic Operation Test
Note: Perform these checks in the order presented to
avoid damaging the ATS.
Read all instructions on the labels affixed to the
automatic transfer switch before proceeding.
3.2 Manual Operation Test
If you have not already done so, test the contactor
manual operation before proceeding to the voltage
check and electrical operation test.
Note: Disable the generator set and disconnect the
power by opening the circuit breakers or switches
for both sources before manually operating the
transfer switch.
Follow the instructions in the Installation Section to
check the transfer switch manual operation.
A contactor in normal and serviceable condition
transfers smoothly without binding when operated
manually. Do not place the transfer switch into service if
the contactor does not operate smoothly without
binding; contact an authorized distributor/dealer to
service the contactor.
3.3 Voltage Check
The voltage, frequency, and phasing of the transfer
switch and the power sources must be the same to avoid
damage to loads and the transfer switch. Compare the
voltage and frequency ratings of the utility s ource,
transfer switch, and generator set, and verify that the
ratings are all the same.
Use the voltage check procedure explained in this
section to verify that the voltages and phasing of all
power sources are compatible with the transfer switch
before connecting the power switching device and
controller wire harnesses together.
Follow the instructions provided with the generator set to
prepare the generator set for operation.
Read and understand all instructions on installation
drawings and labels on the switch. Note any optional
accessories that have been furnished with the switch
and review their operation.
Note: Source N is the source connected to the normal
side of the contactor. Source E is the source
connected to the emergency side of the
contactor. Verify that the source leads are
connected to the correct lugs before proceeding.
The voltage check procedure requires the following
equipment:
D A digital voltmeter (DVM) with electrically insulated
probes capable of measuring the rated voltage and
frequency
D A phase rotation meter
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)
Voltage Check Procedure
1. If Source N is a generator set, move the generator
set master s witch to the RUN position. The
generator set should start.
2. Close the Source N circuit breaker or switch.
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