Trouble-Shooting - Gardner Denver L Series Service Manual

11. Trouble-shooting

In the case of faults or warnings that are detected by the compressor controller, please refer to the chapter
"Fault/warning table" in the operating instructions of the controller.
Malfunction
Unit cannot be started
Unit stops during the
start-up phase
Unit does not reach
the set mains
pressure
Possible cause
1. No operating or control voltage
2. Malfunction not acknowledged
3. Pressure reservoir not depressurized
4. Electric motor defective
5. Compressor defective
6. Ambient temperature less than 34°F
7. Remote control/timer has been activated
8. Mains pressure exceeds the lower
switching point (L55-L75) or the
prescribed pressure (L55RS-L75RS)
1. Suction regulator only closes part way,
pressure builds up too quickly in the
pressure reservoir
2. System short
3. Connection terminal in switch cabinet is
loose
4. Oil is too viscous
5.
Maximum motor cycles exceeded due to
manually switching off and on too often
1. System pressure sensor set too low
Suction regulator only opens partially
2.
3. Air bleed too large
4 Fine oil separator is dirty
5 Air filter is dirty
6 Large leaks in the compressor system
13-25-638 v03
Remedy
1. Check fuses, main switch and supply line
2. Acknowledge fault message
3. Wait until depressurized
4. Check connections, winding, etc.
5. Turn the compressor manually; if
required, replace
6. Make sure that the ambient temperature
is not less than 34°F; install an auxiliary
heater, if required
7. Deactivate remote control/timer
8. Wait until the mains pressure has fallen
below the lower switching point
1. Make the suction regulator viable,
replace if necessary, check the solenoid
valve
2. Determine cause and remedy, replace
defective fuses
3. Check and tighten
4.
Choose type of oil which suits the
environmental conditions or install an
idle heater
5.
Avoid frequent manual on and off
switching, let the electric motor cool
1. Check, reset
2.
Make the suction regulator viable,
replace if necessary, check the solenoid
valve
3.
Throttle the bleed or attach additional
compressors
5. Replace the fine oil separator cartridge
6. Replace air filter cartridge
7. Check the unit
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