Electrical Maintenance
88
Removal and Replacement
Procedure
1. Turn unit off.
2. Disconnect the unit battery.
3. Disconnect the standby power.
4. Remove the high voltage cover.
5. Disconnect the three wires from the phase
detect module at the motor contactor.
6. Unplug the phase detect module harness.
7. Remove the old phase detect module.
8. Install the new phase detect module.
9. (3 Phase Applications) Connect the new phase
detect module wires to the upper contactor as
follows:
Connect the brown wire to L1 on the
contactor.
Connect the blue wire to L2 on the contactor.
Connect the black wire to L3 on the contactor.
Use crimp-on terminals as required.
10. (Single Phase Applications) Connect the new
phase detect module wires to the upper
contactor as follows:
Connect the brown wire to L1 on the
contactor.
Connect the blue wire to L2 on the contactor.
Use crimp-on terminals as required.
Tape the black wire back onto itself. It is not
used on single-phase installations.
11. Connect the plug on the short harness from the
phase detect module.
12. Install the high voltage cover.
13. Secure wires and wire harnesses as required
using cable ties.
14. Connect the unit battery.
15. Perform a Unit Self Check test to verify
proper operation.
Diagnostics - Truck SPECTRUM
™
TS
Applications
1. Plug the standby power cord into a know good
power supply and turn the unit on.
2. Using a Fluke Meter, test the L1, L2, and L3
circuits at the input to the terminals where the
Brown, Blue and Black wires are connected.
The voltage should be between 200-500 VAC
between the circuits. If not, repair as necessary
to supply the needed voltage to the unit.
3. Check the 8 circuit to the Phase Detect
Module for 12-24 Vdc. If voltage is not
present, check the Phase Select Module
connector and the Interface Board connector
for secure connections.
4. If correct AC power is present in test #2
above, then the ER output should measure
12-24 Vdc. If no voltage is present, replace the
Phase Detector Module.
5. If voltage is present on the ER output, then the
D/E LED on the Interface Board should be on.
If not, check the Diesel/Electric Relay circuit
on the Interface Board.
6. If voltage is measured on the ER output, and
the D/E LED is on, then the 7EA input should
measure 12-24 Vdc. If voltage is not present,
check the Phase Select Module connector and
the Interface Board connector for secure
connections.
7. If voltage is present on the ER output and the
7EA input, and the D/E LED is on, then either
the 7EB or 7EC output should measure 12-24
Vdc and one of the phase select contactors
should be on. If voltage is not present on
either the 7EB or 7EC output, replace the
Phase Select Module.
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