TP-6745 7/1048 Section 3 Controller Test and Replacement
3.3 Controller Power
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)
3.3.1 Controller Power Supply
The controller power board converts AC line voltage to
DC voltage for the logic board. Line voltage or DC
voltage from an external battery connected through an
External Battery Supply Module (EBSM) will cause
LED1 on the controller’s power board to light. See
Figure 3-5 for the LED location.
D If the Normal or Emergency source is available but
the controller display is dark, check LED1 on the
controller power board. LED1 lights when voltage is
available for the logic board.
D If the transfer switch is equipped with an EBSM,
disconnect the I/O module assembly at connector
P16 on the controller to remove the external battery
supply. Then check LED1 with the Normal or
Emergency source available.
D If LED1 lights but the controller display is dark, check
the ribbon cable connections between the controller’s
power board and logic board and from the logic board
to the display.
D If LED1 does not light when the Normal or Emergency
source is available, check for line voltage to the
controller using the following procedure:
Check for Line Voltage to the Controller
1. Disconnect power to the transfer switch by opening
circuit breakers or switches.
2. Disconnect the transfer switch wiring harness from
the controller at the 24-pin connector.
3. Reapply power to the transfer switch.
4. Check for voltage across the wiring harness pins.
Observe all Safety Precautions when checking the
voltage.
a. If Source N is available, check for line voltage
across pins 4 and 12 of the transfer switch
wiring harness connector.
b. If Source E is powering the transfer switch,
check for line voltage across pins 6 and 7 of the
connector.
If there is no power to the pins checked in step 4, check
the wiring harness continuity. Replace the harness if
necessary.
If there i s power to the pins checked in step but LED1 on
the power board does not light when power is
connected, replace the power board.
3.3.2 Powering Controller Directly
(Service Kit GM52407)
On occasion it is necessary to supply 120 VAC power
directly to the controller for testing. Service Kit
GM52407 contains a cable with a transformer to supply
power to the controller from a 120 VAC wall outlet.
Disconnect the controller from the transfer switch.
Disconnect the I/O module assembly (if equipped) and
connect the cable to the controller’s P16 connector. See
Figure 3-6.
The cable can also be connected to the I/O module
assembly, if desired. Plug the cable into a 120 VAC wall
outlet to power the controller during testing.
Note: Do not connect 120 VAC power to any other
location on the controller.
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