Thermo King 002008, Manual

Page: 51 / 155

Electrical Maintenance
51
4. If all of the wiring is correct, and the relays
and contactors are acceptable, but the electric
motor still runs backwards, switch the Brown
wire and the Black wire from the PSM at the
heater contactor: Black to L1, Blue to L2, and
Brown to L3. If the electric motor now runs
correctly, it is probably wired incorrectly.
If the electric motor does not run at all:
1. Make sure that the unit is turned On, the
Diesel/Electric switch is in the Electric
position, and that the power supply is
connected and turned On.
2. Check the CH terminal on the PSM for
continuity to the CH circuit (chassis ground).
If there is no continuity to the CH circuit,
check the CH wire for continuity.
3. Check for battery voltage (12 volts) at the
7EA and 8 terminals on the PSM. Battery
voltage should be present. If not, check the
7EH circuit, the overload relay, the 7EHA
circuit, the Electric HPCO, the 7EA circuit,
the F2 fuse, the 7E circuit, the Diesel/Electric
switch, the 7K1 circuit, the F6 fuse, the run
(7K) relay, the F22 fuse, the 8A circuit, the
Zone 1/Host On/Off switch, the 2AA circuit,
the F20 fuse, the 2 circuit, the fuse link, and
the battery. Also make sure that the
microprocessor display is on and that the
microprocessor is calling for heat or cool.
1
5
4
ARA111
2
3
6
1. Overload Relay 4. PSM Relays
2. HC—Heater Contactor 5. MC2—Motor Contactor
3. PSM—Phase Selection Module 6. MC1—Motor Contactor
Figure 22: High Voltage Tray