P545 Series Electronic Lube Oil Control Product/Technical Bulletin
9
2. Disconnect the contactor from the compressor
motor, or disconnect power to the compressor.
Note:
On systems using the R310AD switch,
remove relay connections to control
terminals W1 and W2, and connect a
jumper between those two terminals. (See
Figure 13.)
3. Re-energize the supply voltage to the
P545 control. Verify that all operating and limit
controls are closed.
Note:
The compressor contactor circuit
energizes and both the yellow and green
LEDs light up after the short-cycle delay
has expired. The green LED indicates
that the compressor contactor is
energized. The yellow LED indicates that
net oil pressure is low and that the timing
circuit is activated.
When the low pressure time delay
elapses, the control de-energizes (locks
out) the contactor. The red LED lights up
and the yellow and green LEDs turn off.
The control’s alarm contacts (Terminals
CMA to NOA) close and the liquid line
solenoid contacts (Terminals CMA to
NCA) open.
4. Press RESET. The red LED turns off and the
green and yellow LEDs turn on. The contactor is
now energized.
5. De-energize the supply voltage. Reconnect the
compressor leads to the contactor, or reset the
disconnect. If an R310AD switch is used,
reconnect the compressor leads to the contactor.
See Figure 13.
6. Re-energize the supply voltage. If operating and
limit controls are closed and power has been
removed for longer than the anti-short cycle
delay, the compressor starts and both the green
and yellow LEDs light up. The yellow LED turns
off when the lube oil pressure level reaches the
opening point, usually within seconds of starting
the compressor.
Operational Control Test
Use this test to verify the P545 control is operating
correctly. This test simulates a low oil pressure
condition and initiates an immediate lockout of the
compressor.
1. With power to the control, adequate oil pressure
available, and contactor energized (only the green
LED is on), press and hold down the Test button.
Note:
The red LED lights up and the control
de-energizes (locks out) the compressor
contactor. The control alarm circuit (NOA contact –
see Figure 7) is energized.
2. Wait 100 seconds and press the Reset button to
energize the contactor and restart the motor.
Note: The P545 control cannot be reset without
power.
The control remains in a lockout condition
(compressor contactor de-energized) until the Reset
button is pressed, even if power is removed from the
control.
