7
TROUBLESHOOTING
Troubleshooting instructions
The following tables list possible fault causes and
remedies.
The troubleshooting measures listed in these op-
erating instructions may only be carried out by
specially trained personnel. All work going beyond
this must be carried out by the manufacturer's ser-
vice personnel! Work on the electrical equipment
must only be carried out by authorised electricians
or electrical technicians.
Remedies are described in detail in the repair
manual, which is provided as part of operator
training.
NOTICE
Material damage
Material damage due to improper/incorrect trou-
bleshooting measures.
➯
If the remedies listed here are insufficient
for rectification of the fault, consult Gardner
Denver.
➯
For fault and warning messages that are
output to the display of the electronic control
unit, observe the information in the "Trou-
bleshooting" chapter in the operating in-
structions of the electronic control unit.
Fault: The system will not start
Possible Cause
Remedy
Missing operating or control voltage
Check fuses, main switch and power cable.
Fault is not acknowledged
Acknowledge fault in the electronic control unit.
Pressure vessel not depressurised.
Wait for depressurisation. Screw compressor does
not start up when the pressure in the vessel is
greater than the preset value. See factory setting
Start approval DELCOS XL.
Drive motor defective
Check connections, winding, etc.
Compressor defective
Rotate the compressor by hand, if necessary
replace.
Ambient temperature < +1 °C
Ensure that the ambient temperature is at least
+1 °C, if necessary provide stationary heating
The remote control/timer control via terminal strip is
activated
Deactivate remote control/timer control
Line pressure is above the lower switching point
(compressor without speed control) or nominal
pressure (compressor with speed control)
Wait until the line pressure has fallen below the
switching point / nominal pressure
Chart 7-1: Troubleshooting upon: The system will not start
Fault: The system remains stationary during the start-up phase
Possible Cause
Remedy
Short-circuit in the compressor
Determine the cause of the short-circuit and rectify.
Replace defective fuses.
Terminals loose
Check the terminals and tighten if necessary.
Too frequent manual switching on and off results in
exceeding of the maximum motor switching cycles
Avoid frequent manual switching on and off.
Allow the electric motor to cool.
Chart 7-2: Troubleshooting upon: The system remains stationary during the start-up phase
