Hitachi RAM-50CNHZ2, Service Manual, Page: 98 / 107

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2 Lighting mode self-diagnosis lamp
RAM-50CNHZ2
DANGER
(DC360V)
WAIT FOR TEN-
MINUTE(MIN) AFTER
TURNING OFF THE
POWER SWITCH WHEN
SERVICE WORK IS
BEING DONE.
SHOULD BE CONFIRM
TO VOLTAGE LESS
THAN DC 10V
AT MEASURING
POSITION.
DO NOT TOUCH SCREW
OF SYSTEM POWER
MODULE DUE TO HIGH
VOLTAGE.
DO NOT TOUCH OTHER
PARTS AT THE CASE
OF PUSHING SERVICE
SWTCH.
SERVICE
OPERATION
REFRIGERANT WITHDRAWAL OR SINGLE
OPERATION OF THE OUTDOOR UNIT,
SHALL SWITCH OFF THE EXCLUSIVE
BREAKER FIRST.
PUT THE SWITCH TO ON POSITION
BACK AND WAIT AT LEAST 1 MINUTE.
THEN PUSH THE SERVICE SWITCH
WHICH IS ON THE CIRCUIT BOARD
FOR MORE THAN 1 SECOND.
(THERE WILL BE A COOLING CYCLE)
TO PRESERVE PARTS FROM DAMAGE,
MUST NOT OPERATE IT FOR MORE
THAN 5 MINUTES.
TO PAUSE, PUSH THE SERVICE SWITCH
AT LEAST 1 SECOND. IN CASE TO
START OPERATING ONCE AGAIN
PLEASE SWITCH OFF THE POWER BACK.
SELF-DIAGNOSIS LIGHTING MODE :LIT :BLINKING :OFF
MAIN CHECK POINT DETAILS
SELF-DIA-
GNOSIS NAME
L
D
3
0
1
L
D
3
0
4
L
D
3
0
2
RED RED
[1]DURING OPERATION
[2]DURING STOP
LD303(RED)LIGHTS.
LD303(RED)GOES OFF.
NOT MALFUNCTION
NOT MALFUNCTION.
P.W.B.s (POWER CIRCUIT,
MICROCOMPUTER, ETC.)
SYSTEM POWER MODULE
COMPRESSOR P.W.B.s
SYSTEM POWER MODULE
COMPRESSOR P.W.B.s
SYSTEM POWER MODULE
COMPRESSOR P.W.B.s
OUTDOOR UNIT IS EXPOSED TO DIRECT
SUNLIGHT OR ITS AIRFLOW BLOCKED.
FAN MOTOR FAN MOTOR CIRCUIT
THE VOLTAGE IS EXTREMELY LOW.
LEAK OF REFRIGERANT COMPRESSOR
OH THERMISTOR CIRCUIT
FAN MOTOR FAN MOTOR CIRCUIT
THERMISTOR CONNECTION
OF THERMISTOR DEFECTIVE
THERMISTOR CIRCUIT
LEAK OF REFRIGERANT
COMPRESSOR
POWER VOLTAGE
CONNECTION OF REACTOR
FAN MOTOR
FAN MOTOR CIRCUIT
CABLE IS WRONG CONNECTED
CABLE IS OPEN INTERFACE
CIRCUIT BETWEEN INDOOR
UNIT AND OUTDOOR UNIT
COMMUNICATIONS BETWEEN
INDOOR UNIT AND OUTDOOR
UNIT ARE INTERRUPTED
OVERVOLTAGE IS
DETECTED BY
SYSTEM POWER MODULE
MICROCOMPUTER CANNOT
READ THE DATA IN EEPROM.
OUTDOOR FAN RPM IS
NOT ROTATE AS INTENDED
RPM
POWER VOLTAGE
IS ABNORMALLY LOW.
THERMISTOR IS OPEN OR
SHORTED.
OH THERMISTOR
OPERATED.
NO ACCELERATION OVER
THE LOWER LIMIT OF
THE ROTATION SPEED.
L I G H T S F O R 0 . 2 5
SEC AT INTERVAL
OF 0.25 SEC.
P.W.B.s (POWER CIRCUIT,
EEPROM. ETC.)
SYSTEM POWER MODULE
2SEC
INDOOR THERMOSTAT OFF.
MAIN OPERATION OFF.
SWITCHING FROM LOW
FREQUENCY SYNC START
TO POSITION DETECTION
OPERATION FAILURE.
UNDER THE LOWER LIMIT
OF ROTATION SPEED
WITH OVERLOAD CONTROL
CIRCUIT OPERATED.
OVERCURRENT
IS DETECTED.
POSITION DETECTION
SIGNAL IS NOT INPUT
DURING OPERATION.
WHEN STOPPED WITH
POWER RESET.
(NORMAL WHEN POWER
HAS BEEN TURNED ON.)
COMPRESSOR
OPERATION
T I M E
(1) (2)
(3)
SET
VALUE
R
O
TAT
IO
N
SPEED
THE ROTATION SPEED IS
AUTOMATICALLY CONT-
ROLLED TO PROTECT THE
COMPRESSOR IN THE
OVERLOAD CONDITION.
NORMAL
OPERATION
OVERLOAD
(1)
OVERLOAD
(2)
OVERLOAD
(3)
THIS SHOWS AN
OVERLOAD,
NOT MALFUNCTION.
NORMAL
STOP
RESET
STOP
PEAK CURRENT
CUT
SWITCHING
FAILURE
OVERLOAD
LOWER LIMIT CUT
OH THERMISTOR
TEMP.RISE
THERMISTOR
ABNORMAL
ACCELERATION
DEFECTIVE
ABNORMAL
POWER VOLTAGE
FAN LOCK
ERROR
EEPROM
READ ERROR
ACTIVE CONVERTER
DEFECTIVE
COMMUNICA-
TIONS ERROR
NORMAL
1TIME
14TIMES
13TIMES
12TIMES
10TIMES
8TIMES
7TIMES
6TIMES
5TIMES
4TIMES
3TIMES
2TIMES
1TIMES
EXAMPLE OF
BLINKING (5 TIMES)
GRN
ABNORMAL
LOW SPEED
ROTATION
3 2
1
1
2
1
2
1
2
1 2
1
1
1
2
1
2
1
2 3
3
3
3 2
4
3
4
2
5
3
( )
M A I N P. W. B .
LD301
LD302
LD303
LD304
S E RV I C E
SWITCH