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