4 Bedienung im Normalbetrieb
4 - 6
4.4 Remedying malfunctions in normal operation
(continued)
Fault
Possible Cause
Remedy
Compressor starts
with difficulty
•
Change over
time for star-
delta starting is
too long or too
short (only for
systems with
star-delta starter)
•
The non-return
valve on after-
cooler is
defective (only
for Y -
∆
starter)
•
Voltage
fluctuations in
the electrical
network
Check and adjust
time setting, correct
setting is 3-6 seconds
on relay K 1T
Check solenoid valve
and relief valve and
change if necessary
Change non-return
valve
Compressor cuts
out before reaching
the final pressure
•
Motor overload is
tripping
•
Combistat cuts
out due to
excessively high
temperature
Check and adjust
overload setting;
check and adjust
pressure switch
setting; check
electrical supply for
phase failure.
Ensure correct
compressor cooling;
install new
Combistat, if
defective
Motor protection
switch tripping
(therm. overcurrent
relay) has stopped
the compressor
•
Seized air end
•
Phase failure
•
Motor
overloaded
•
Ambient
temperature too
high
Eliminate reason for
seizure
Check supply line
Check and adjust
overload setting;
check and adjust
pressure switch
setting
Ensure adequate
ventilation
Continued overleaf
Malfunctions
(contd.)
Summary of Contents for Scroll Line Industry Series
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