Troubleshooting - Liebert LSF24 User Manual

4.2 Troubleshooting

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