CHAPTER 9: MALFUNCTIONS 9-3
ALPHA 538/552
AL04: Oil pressure failure!
Description
The PLC does not detect input (X12 – SP2) after
a period of 30 seconds. The problem is generated
anytime oil pressure is not sufficient to make the
oil pressure switch.
Solutions
Check the oil level 80 litres of oil ISO 100 are
recommended
Switch the PLC to RUN mode.
Adjust or replace the pressure switch SP2.
Press the STOP button on the remote control to
reset the alarm.
AL05: Air pressure failure!
Description
The PLC does not detect input (X11 – SP1) after
a period of 5 seconds. The problem is generated
anytime air pressure is not sufficient, below 3 bar
or 45 psi,(300kPa) to make the air pressure
switch.
Solutions
Raise the air pressure to min. 3 bar et max. 6 bar.
Switch the PLC to RUN mode.
Adjust or replace the pressure switch SP1.
Press the STOP button on the remote control to
reset the alarm.
AL06: SQ3 (channel open) or SQ4 (channel close) failure!
Description
SQ3 or SQ4 failure
Solutions
Check the switches SQ3 and SQ4
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