Kaisai 06RY1, Service Manual

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Situation 3: L0 or L4 error appears after the compressor has been running for a period of time and the compressor
speed is over 60rps
L0 / L4
Inverter module has overheated
Yes
Repaint the thermally conductie silica
gel on the IPM module, IGBT, diode,
brigde rectifer
(on the reverse side of
the inverter module PCB)
1
No
Inverter module is over-current
2
Yes
Replace the compressor
No
Replace the inverter module
3
Notes:
1. Refer to Figure 4-4.2.
2. Use clip-on ammeter to measure the compressor current, if the current is normal indicates the inverter module is failed, if the current is abnormal
indicates the compressor is failed.
3. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the PFC and IPM modules (on the reverse side of the
inverter module PCB). Refer to Figure 4-4.2.
Situation 4: L0 error appears occasionally/irregularly
L0
The outdoor unit ventilation is not good
Yes
Ensure enough space for unit ventilation
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L1/L2 troubleshooting 4.20.7
The normal DC voltage between terminals P and N on inverter module is 1.4 time of AC power supply in standby , the DC
voltage is 377V when the fan motor is running. If the voltage is lower than 160V, the unit displays L1. If the voltage is
higher than 500V, the unit display L2.
Figure 4-4.3: Inverter module terminals
Inverter module terminals (4-10KW) Inverter module terminals (12-16KW)
U V W N P U V W N P
Situation 1: L1 or L2 error appears immediately after the outdoor unit is powered-on
L1 / L2
Power supply is abnormal
Yes
Re-start the unit once the power supply
has returned to normal
No
Replace the inverter module
1
Notes:
1. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the IPM module, IGBT, diode, brigde rectifer (on the
reverse side of the inverter module PCB). Refer to Figure 4-4.2.
Situation 2: L1 or L2 error appears after the compressor has been running for a period of time and the compressor
speed is over 20rps
L1 /L2
Relay on outdoor unit main PCB is open
Yes
Replace the outdoor unit main PCB
No
Replace the inverter module
2
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