Troubleshooting - Emerson Liebert PEX User Manual

4.2 Troubleshooting

See Table 4-1 for alarm troubleshooting.
Alarm
Alarm name
number ID
Phase loss
A00
alarm
SCR over
A01
temperature
Fan 1 over
temperature,
A02, A03
Fan 2 over
temperature
Pressure
A04
sensor failure
EEPROM
A05
read fault
SCR
A06 temperature
sensor failure
Abnormal
A07
frequency
散热片
Heat sink
Figure 4-2 Removing the fan speed controller board
Table 4-1 Table of alarm troubleshooting
Cause
One phase or two phases of three-phase
voltage are lost
The input connection is reversed
The fan speed controller board has a
hardware fault
The fan cannot run normally
The fan speed controller board has a
hardware fault
The fan cannot run normally
The AC contactor supplying power for fan
has fault or its wire cuts off
The fan speed controller board has a
hardware fault (the detecting circuit or SCR
power supplying circuit has fault)
The pressure sensor is not installed or its
terminal connection is poor
Jumper caps are not used to short terminals
J17 and J18 of current pressure sensor
Pressure sensor failed
The fan speed controller board has a
hardware fault
The fan speed controller board has a
hardware fault
The SCR temperature sensor is not
installed or its terminal connection is poor
SCR temperature sensor failed
The fan speed controller has a hardware
fault
The frequency of power supply voltage is
wrong
The fan speed controller has a hardware
fault
Liebert.PEX Condenser User Manual
Chapter 4 Maintenance And Troubleshooting
Bolt 1
Fan speed controller board
Bolt 2
Check that the three-phase voltage is correct
Check the input order of wire
Replace the fan speed controller board and compare
the result of two boards
Check that the fan runs normally
Replace the fan speed controller board and compare
the result of two boards
Check that the fan runs normally
Check the wiring of AC contactor; detect the auxiliary
contact state of AC contactor
Replace the fan speed controller board and compare
the result of two boards
Check the wiring of pressure sensor
Install the jumper cap when the current pressure
sensor is configured
Replace the pressure sensor and compare the result
of two boards
Replace the fan speed controller board and compare
the result of two boards
Replace the fan speed controller board and compare
the result of two boards
Check the wiring of SCR temperature sensors (J8
SCRTemp, see Figure 3-1 for its position )
Replace the SCR temperature sensor and compare
the result of two sensors
Replace the fan speed controller board and compare
the result of two boards
Replace the fan speed controller board and compare
the result of two boards
Troubleshooting
15