Hertz HDD 75 - Failures, Reasons and Solutions; Table 7 Failures and Solutions

FAILURES
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8.2 Failures, Reasons and Solutions
Table 7 Failures and Solutions
FAULT
CAUSE
REMEDY
Compressor does not operate.
No power.
Check the voltage at the main fuse input.
Control and input fuse blown.
Check the fuses.
Mains voltage low, imbalanced or the
phases are reverse.
Check the warning message on the control
panel.
The compressor stopped for any failure.
Check the warning message on the control
panel.
The compressor is started without
discharging the internal pressure.
The compressor does not start for 1 minute once
it is stopped in order to release the internal
pressure. Try to start the compressor again 1
minute later.
The compressor hardly
operates
Insufficient section of the input feeder
cable
This problem is observed in the installations
where the cables of improper thickness are
used. With the compressor being in STOP
position, measure the input voltage while
continuing measurement. If the voltage reduces
to less than 5% of the required voltage level, it
means that the cable section is insufficient. Use
cables of appropriate section for connection.
Low voltage.
If the mains voltage is %5 or more less than the
preset voltage setting of the compressor, it is
understood that the problem is caused by the
mains voltage or the installed power of your
facility.
Low ambient temperature.
If the ambient temperature is less than 35 °F
(0°C), the oil will be thickened, so the
compressor will start under a load and possibly
trip overloads.
Mechanical problem in the motor or screw
De-energize the compressor, and check if the
coupling easily turns. If it turns abnormally
difficult, it means that there is a mechanical
failure in the motor or screw; call the authorized
service station.
Intake regulator failure.
The intake regulator clamp is closed at the time
of start-up; it may remain open for a mechanical
problem, so that the compressor tries to start
against load, and therefore hardly starts up. With
the compressor in STOP position with no internal
pressure, check that the clam is fully closed. The
clamp might be stuck in open position. Call the
authorized service station.