Kaisai KMK-60RY1, Руководство по обслуживанию

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4.21 Inverter module Troubleshooting for three-phase models
Digital display output 4.21.1
Description 4.21.2

Inverter module protection or high pressure protection.

Mono stops running.

Specific error code L0, L1, L2, L4, L5, L8 , L9 is displayed on the user interface and the refrigerant system main
PCB.
Possible causes 4.21.3

Inverter module protection.

DC bus low or high voltage protection.

MCE error(DC bus low or high voltage protection or software over current protection)

Zero speed protection.

Excessive compressor frequency variation.

Actual compressor frequency differs from target frequency.

High pressure protection.

Contactor stuck or 908 self checking fail.
Specific error codes for inverter module protection 4.21.4
Table 4-4.4: Specific error codes
Specific error code Content
L0 Inverter module protection
L1 DC bus low voltage protection
L2 DC bus high voltage protection
L4 MCE error(DC bus low or high voltage protection or software over current protection)
L5 Zero speed protection
L8 Compressor frequency variation greater than 15Hz within one second protection
L9 Actual compressor frequency differs from target frequency by more than 15Hz protection
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The specific error codes can also be obtained from the LED indicators LED1/LED2 on the inverter module.
Table 4-4.5: Errors indicated on LED for three-phase 12~16kW unit
LED1/2 flashing pattern 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(DC bus low or high voltage protection or software over current
protection)
Flashes 13 times and stops for 1 second, then repeats L5 - Zero speed protection
Flashes 17 times and stops for 1 second, then repeats
L8 - Compressor frequency variation greater than 15Hz within one second protection
L9 - Actual compressor frequency differs from target frequency by more than 15Hz
protection
Flashes 3 times and stops for 1 second, then repeats bH - Contactor stuck or 908 self checking fail
Flashes 5 times and stops for 1 second, then repeats P1 - High pressure protection
Figure 4-4.5: LED location of inveter module for three-phase 12~16kW unit
Principle of DC inverter 4.21.5
① 380-415V AC power supply change to DC power supply after bridge rectifier.
② Contactor is open the current across the PTC to charge capacitor, after 5 seconds the contactor closed.
③ The capacitor output steady 540V DC power supply for inverter module P N terminals.
Power
supply
(380V AC)
A
B
C
Bridge
rectifier
PTC
Contactor
Inductor
Capacitor
Inverter module
(V
P-N
: 540V DC)
U
V
W
Compressor
P
N
○
3
○
1
○
2
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