SRL Service Manual
Revision 00
July 2007
Page 44 of 56
10.2.6 C
ompressor Protection (Alarm)
What it means: The compressor protection module registers a motor winding temperature above
the allowable limit.
What it does: Cuts power to compressor contactor & alarm contacts. Turns dryer OFF. Turns on
Warning Light & blinks “CP” on the digital display.
Possible Causes & Remedies:
1) Scroll compressor is rotating backwards because the phases are inverted. The
compressor is not displacing any refrigerant, so there is no cooling of the
compressor causing it to overheat. The compressor will generally be noisy, and
there will be no cooling in the refrigerant circuit.
Remedy - Swap two phases on the power supply.
2) One phase of the power supply is disconnected. Because of the missing phase,
the compressor is pulling high Amps, causing overheating of the windings.
Remedy – Ensure that the electrical connections at the compressor terminal and
the contactor are correctly attached and tight.
To Reset: Find the cause of the alarm and fix the problem.
Press ALARM RESET to clear alarm. Power restored to alarm relay, Warning Light
goes off. Dryer remains OFF. Display clears.
Press ON/OFF to restart dryer.
Notes: Alarm can only be cleared if the compressor protection module registers a winding
temperature within allowable limits.
10.2.7 P
arameter data Error (Alarm)
What it means: The microprocessor found an anomaly during a periodic check of the flash memory
and the stored parameters.
What it does: Resets all parameters to their default settings. Cuts power to compressor contactor
& alarm contacts. Turns dryer OFF. Turns on Warning Light & blinks “PdE” on the
digital display.
To Reset: Press ALARM RESET to clear alarm. Power restored to alarm relay, Warning Light
goes off. Dryer remains OFF. Display clears.
Press ON/OFF to restart dryer.
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