Mea 7236, Owner'S/Operator'S Manual

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Document No
7235-D0001-01 10
7. TROUBLESHOOTING
(Detailed procedures on troubleshooting of the compressor system can be found in “Compressor
Information (APPENDIX-A)”.
Fault Possible cause Remedy
Not functioning
Control box or electrical
connection faulty
Have control box or electrical
connection repaired. Incorrect
rotation direction Phases reversed
Reconnect
Incorrect rotation direction Hoses are connected wrongly Reconnect supply and return hoses
Screw compressor system
has difficulty starting
Flow and pressure not
insufficient
Inspect
Drive transmission ratio too fast Check flow and pressure
Star-delta switchover incorrect Set
Compressor is flooded with oil Check
System has not been
depressurized yet
Check, depressurize if necessary
Ambient temperature too low Check viscosity of the oil
Oil filling too viscous Check viscosity of the oil
Pressure losses at
filter cartridges
Excessive pressure loss at
air-oil separating element
Replace air-oil separating element
Combistat switches off
due to excessively high
temperature
Oil shortage
Check the oil level in the oil
reservoir, fill if necessary
Oil filter soiled Replace oil filter cartridge
Oil thermostat faulty Replace oil thermostat
Oil cooler soiled
Clean oil cooler on air side, clean
on oil side if necessary
Incorrect setup
a) Room ventilation
b) Exhaust air obstructed
c) Thermal short-circuit
Follow recommendations for
installation of the compressor
system
Combistat defective Replace combistat
Safety valve blows off
(at a permissible operating
pressure)
Safety valve defective Replace safety valve
Air-oil separating element dirty Replace air-oil separating element
Compressor system does not
switch off automatically, control
valve operates intermittently
Check the solenoid valve, replace
if necessary
Oil in compressed air
Operating pressure and
delivery quantity is not in the
permissible range
Check pressures
Oil exhaust system
contaminated
Clean oil extraction system
Air-oil separating element faulty
Check air-oil separating element
and replace if necessary
Oil level in oil reservoir
too high; possibly
excessive condensate
Observe oil level marking; drain
and replace if necessary