Kaisai KMK-60RY1, Service Manual

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The specific error codes can also be obtained from the LED indicators on the inverter module.
Table 4-4.2: Errors indicated on LED, single-phase 4~10kW
LED301 flashing pattern (GREEN)
LED302 is always on (RED)
Corresponding error
Flashes 8 times and stops for 1 second, then repeats L0 - Inverter module protection
Flashes 9 times and stops for 1 second, then repeats L1 - DC bus low voltage protection
Flashes 10 times and stops for 1 second, then repeats L2 - DC bus high voltage protection
Flashes 12 times and stops for 1 second, then repeats L4 - MCE error
Flashes 13 times and stops for 1 second, then repeats L5 - Zero speed protection
Flashes 16 times and stops for 1 second, then repeats L8 - Compressor frequency variation greater than 15Hz within one second protection
Flashes 17 times and stops for 1 second, then repeats
L9 - Actual compressor frequency differs from target frequency by more than 15Hz
protection
Table 4-4.3: Errors indicated on LED, single-phase 4~10kW
LED1 flashing pattern (GREEN)
LED2 is always on (RED)
Corresponding error
Flashes 3 times and stops for 1 second, then repeats P1 - High pressure protection
Flashes 5 times and stops for 1 second, then repeats bH – PED board checking fail
Flashes 8 times and stops for 1 second, then repeats L0 - Inverter module protection
Flashes 9 times and stops for 1 second, then repeats L1 - DC bus low voltage protection
Flashes 10 times and stops for 1 second, then repeats L2 - DC bus high voltage protection
Flashes 12 times and stops for 1 second, then repeats L4 - MCE error
Flashes 13 times and stops for 1 second, then repeats L5 - Zero speed protection
Flashes 16 times and stops for 1 second, then repeats L8 - Compressor frequency variation greater than 15Hz within one second protection
Flashes 17 times and stops for 1 second, then repeats
L9 - Actual compressor frequency differs from target frequency by more than 15Hz
protection
Figure 4-4.1: LED location of inverter module
Inverter Module( 6 -10KW): LED301/302/303 Inverter Module(12-16KW): LED1/LED2/LED3
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Principle of DC inverter 4.20.5
①Contactor is open, the current across the PTC to charge capacitor. After 5 seconds, the contactor closed.
②220-240V AC power supply change to DC power supply after bridge rectifier.
③The capacitor output steady power supply for inverter module P N terminals. In standby the voltage between P and N
terminal on inverter module is 1.4 time of AC power supply. When the fan motor is running, the voltage is 377V DC.
L0/L4 troubleshooting 4.20.6
Situation 1: L0 or L4 error appears immediately after the outdoor unit is powered-on
L0 / L4
Inverter module is damaged
1
Yes
Replace the inverter module
2
Notes:
1. Measure the resistance between each of U, V and W and each of P and N on the inverter module. All the resistances should be infinite. If any of them are
not infinite, the inverter module is damaged and should be replaced. Refer to Figure 4-2.5 to 4-2.7 in Part 4, 2.1 “Main PCBs for Refrigerant System,
Inverter Module”.
2. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the IPM module, IGBT, diode, brigde rectifier (on the
reverse side of the inverter module). Refer to Figure 4-4.2.
Figure 4-4.2: Replacing an inverter module
IPM
IGBT
diode
IGBT
diode
brigde rectifier
Power
supply
(220V)
L
N
Bridge
rectifier
PTC
Contactor
Inductor
Capacitor
Inverter
module
U
V
W
Comp
ressor
P
N
PFC
○
3
○
2
○ ○
1
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