Daikin LX10F11B Service Manual page 68

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Inverter Alarm Diagnosis
Inverter board and detection point of operating condition
Inverter Board (EC8)
K1M
L1
L2
K2M
L3
101 F528 ・ F53D
E105 ・ E523 ・ E524 ・ E525 ・ E528 ・ E53D
Alarm
Logic
E105 : Compressor current is too high at starting
&
（≧DC51A）
Possible
Causes
E523： Compressor overload during operation
（≧DC16.1A）
E524： Compressor overload during operation
（≧DC19A）
E525： Compressor speed is down (detection of
stepping out) because actual frequency
is low against command frequency to
compressor
E528：Compressor is not started
F528：E528 is generated 5 times.
E53D： Compressor does not operate during operation.
F53D：E53D is generated 4 times.
Step 1. Check the compressor
Trouble
1-1. Check insulation and resistance of the compressor motor.
Shooting
1-2. Check sound of compressor at starting.
Replace compressor if insulation, resistance is abnormal or noise is created at staring.
Step 2. Replace Inverter board if compressor sound is normal or does not start.
F528 ・ F53D
Controller
E105 ・E523 ・ E524 ・ E525
Action
E528 ・ E53D
P1
AC⇒DC rectification
Q1
C66
C32
Main circuit capacitor
C601
C602
Alarm Logic
Unit stop
Restart after 3 minutes
Restart after 3 minutes (Retry 5 times, F528, F53D is generated
at 4 times.）
2-40
Detection point of operating condition
Power supply environment detection
(current/voltage/waveform)
Capacitor charge status
IPM power module
P2
Q1
C67 C58
C33 C57 R77
INVERTER
PS
X4A
X6A
I/O
HPS
Possible Causes
① Over-current due to compressor overload
②Compressor lock
③ Inverter board failure （ Current detection part）
① Over-current due to compressor overload
③ Inverter board failure （ Current detection part）
① Speed down due to compressor overload
③ Inverter board failure (Frequency
detection part)
②Compressor is lock at starting.
③ Inverter board failure (detection part of
wave form)
② Compressor is lock during operation
③ Inverter board failure (detection part of lock)
Actual frequency detection
(Compressor rotation speed)
Compressor current detection
IPM fin
temperature
detection
CM
Compressor
X801A
X802A
CPU
Communication
CPU
line to CPU board