Kaisai 06RY1, Service Manual

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Condition 4: L0 error appears after the compressor has been running for a period of time and the compressor speed is
over 60rps
L0
Inverter module has overheated
Yes
Repaint the thermally conductive silica
gel on the PFC and IPM modules (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
2
Notes:
1. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the IPM module (on the reverse side of the inverter
module PCB).
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 has failed.
Situation 5: 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 4.21.7
The normal DC voltage between terminals P and N on inverter module is 540V. If the voltage is lower than 300V, the unit
displays an L1 error; if the voltage is higher than 830V, the unit displays an L2 error. Refer to Figure4-4.9.
Situation 1: L1 or L2 error appears immediately after the outdoor unit is powered-on
L1 / L2
P N +15V wire on refrigerant system main
PCB is not connected properly
1
Yes
Ensure P N +15V wire is connected
properly
No
Voltage between N and +15 is abnormal
2
Yes
Check +15V circuit
3
No
DC voltage between terminal P and N is
abnormal
Yes
Check power supply, three phase bridge
rectifier
4
No
Replace the main PCB
Notes:
1. P N +15V terminal on refrigerant system main PCB. Refer to Figure4-4.9.
2. Voltage between N and +15. Refer to Figure4-4.10
Figure 4-4.9: P, N terminals voltage
V
normal
= 540V DC
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