Service manual

44 Siemens-Elema AB E382 EH81E 061 01 03 02
Troubleshooting Compressor Compact
Malfunction Action
The compressor stops; the mains power
lamp stays on:
• The thermal switch inside the motor may
have tripped.
115 V version: The thermal switch on the
motor must be reset manually.
230 V version: The thermal switch will
reset automatically and the motor will
restart.
Operating pressure (shown on the mano-
meter) is correct during functional check but
drops when a ventilator is connected:
• Too high air consumption. The compressor
cannot supply the equipment connected.
• The dust filters or the air inlet filter are
clogged. Clean or replace the filters if
necessary.
• Check the operation of the compressor.
Overhaul or replace it if necessary.
The pressure alarm is activated: • Too high air consumption. The compressor
cannot supply the equipment connected.
• Inspect the internal compressed air tubing.
Clear obstructions, tighten loose connec-
tors and/or replace faulty components.
• The dust filters or the air inlet filter are
clogged. Clean or replace the filters if
necessary.
• Pressure alarm function faulty. Replace
low pressure switch and/or control section
PC board if necessary.
• Check the operation of the compressor.
Overhaul or replace it if necessary.
• The thermoelectric cooler is clogged with
ice due to malfunction in the cooler. Check
the function of the cooler temp. switch:
– Connect a voltmeter between the cooler
connection cables at terminal 6.
– Make sure that the voltage to the cooler
switches between approx. 0 V and 12 V.
Normal switch cycle is approx. 1 min
when no compressed air is consumed.
Replace the cooler if necessary.
Check of cooler temperature switch
1 234556 77
+ +++ - - - --
+ +++ - - - --
1 234556 77
RD
COOLER TEMP. SWITCH (THERMOSTAT)
BK
PC BOARD RCD
TEMP. SENSOR THERMOEL. COOLER FILTER / SOLENOID V. FILTER / SOLENOID V. LOW PRESS. SWITCH
STANDBY SOLENOID V.
START RELAY RL4
STANDBY PRESS. SW.
COMP069E