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• Compressor Start: Oil pressure monitoring is activated
once the supply voltage is applied to the operating recog-
nition signal, which is applied to D1 (violet wire) via an
auxiliary contactor or motor contactor (see wiring dia-
gram). Following a compressor start, the OPSS allows
for a 120 second oil pressure transition delay to allow the
compressor to reach steady oil pressures. The differential
pressure monitoring is activated after the expiration of
the 120 second compressor starting transition time.
• A low differential oil pressure (9 psig) for a continuous
120 seconds will lead to a locked switch and trip the
compressor off.
• Also, a time integrated low differential oil pressure (9
psig) that is fluctuating 60% of the time <= to 9 psig
over a 5 minute rolling window will lead to a locked
switch and trip the compressor off.
• A manual reset of the relay can be carried out by the
built-in push button, or by activating the operating rec-
ognition (D1) or by a 5 second power reset.
• The monitoring of internal errors is always active. Any
faults that occur in any operational phase will lead to a
locked switch off of the relay after 5 seconds and trip the
compressor. The potential-free relay contact can be
looped into a safety circuit without an auxiliary relay. An
installation check monitors for the proper assembly. An
LED status will indicate if the OPSS is faulty or not cor-
rectly installed (See LED Status Table).
• The built-in LED indicates the actual operating state of
the compressor's oil pump pressure. Once the oil DP pre-
set value has been reached (13 psig), the LED light will
be off and the OPSS output contacts remain in the closed
position (Gray and Orange wires). If the differential oil
pressure falls below the cut-out preset value (9 psig) for
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