Failures, Reasons And Solutions; Table 7 Failures And Solutions - Hertz HDD Series Instruction Manual

FAILURES
8.2

Failures, Reasons and Solutions

Table 7 Failures and Solutions

FAULT
Compressor does not operate.
The compressor hardly
operates
CAUSE
No power.
Control and input fuse blown.
Mains voltage low, imbalanced or the
phases are reverse.
The compressor stopped for any failure.
The compressor is started without
discharging the internal pressure.
Insufficient section of the input feeder
cable
Low voltage.
Low ambient temperature.
Mechanical problem in the motor or screw
Intake regulator failure.
49
REMEDY
Check the voltage at the main fuse input.
Check the fuses.
Check the warning message on the control
panel.
Check the warning message on the control
panel.
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.
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.
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.
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.
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.
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.