10
P545 Series Electronic Lube Oil Control Product/Technical Bulletin
Troubleshooting
See Table 2 to troubleshoot the P545 control.
Table 2: Troubleshooting P545 Control Problems
LED Status
Troubleshooting Procedure
No LEDs are lit.
Check the power source.
Red LED is On.
Common
Signal
12
01
10
12
_p
lu
g.
cd
r
WHA-P400-xxx
Wiring Harness Plug
Use these steps to resolve the problem:
1. Connect pressure gauges at the oil pump discharge and at the crankcase.
2. Press RESET on the control.
a.
If the green and yellow LEDs light but the compressor remains off
,
inspect the wiring and check for an overheated motor. If the compressor motor is
overheated, determine the cause and correct the problem. (An R310AD current
sensing switch may be installed along with the control to provide a controlled
shutdown caused by thermal overload.)
b.
If both the green and yellow LEDs turn on for the duration of the time
delay and the system shuts down,
observe the crankcase and oil pump
pressure gauges.
- If the system does not reach sufficient oil pressure by the end of the time
delay, check the compressor and system for problems.
- If the system does reach sufficient pressure:
1. Disconnect the wiring harness at the P400 switch.
2. Use a single piece of 22-gauge wire as a jumper between the common
and signal terminals of the wiring harness.
3. Press RESET.
4. If the green LED lights and the yellow LED turns off, replace the P400
switch. Otherwise, replace the P545 control.
Yellow LED is dim and flickering.
Use these steps to resolve the problem:
1. Check the power source.
2. Confirm that the compressor is operating at sufficient pressure and without
excessive pressure fluctuations.
3. Check the wiring harness for loose connections.
4. If the oil pressure is sufficient, the cable connections are good, and the yellow
LED still flickers, replace the P400 switch.
Control does not lock out the
compressor when lube oil
pressure is low.
Use these steps to resolve the problem:
1. Press the test button.
a. If the P545 control does not lock out in 8 seconds or less, replace the
control.
b. If the P545 control locks out properly, go to Step 2.
2. Disconnect the wiring harness from the P545 control. Press the Reset button.
3. If the compressor starts and runs through the time delay (yellow and green LEDs
lit) and then locks out, check the wiring harness for shorted condition. If the
wiring harness tests okay, replace the P400 switch.
Control does not respond to
R310AD switch. (Control locks
out the compressor after
compressor shutdown. Red LED
is lit.)
Make sure that the anti-short cycle delay is
not
set at 0 seconds.
