Mitsubishi Electric Mr. Slim PUHZ-ZRP35VKA Service Manual page 47

From the previous page.
Abnormal point and detection method
Check Code
PFC/Q1 error (Overvoltage/
Detailed
codes
Undervoltage/Overcurrent)
• I ncrease of DC bus voltage to
35/50VKA: 400V
60/71VHA: 420V
• D ecrease in PFC control volt-
age to 12V DC or lower
• I ncrease in input current to
10
50A peak
(ZRP35-71V)
U9
(4220)
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
DC bus voltage stays at
20
310 V or lower for consecutive
10 seconds
(ZRP60/71VHA, ZRP100-
140VKA)
Over heat protection
Abnormal if outdoor pipe thermistor (TH3)
detects 70: or more during compressor
operation.
Ud
(UD)*
(1504)
Compressor overcurrent interruption
(When compressor locked)
Abnormal if overcurrent of DC bus or
compressor is detected within 30 seconds
after compressor starts operating.
UF
(4100)
Current sensor error
Abnormal if current sensor detects −1.0 A
UH
to 1.0 A during compressor operation. (This
(5300)
error is ignored in case of test run mode.)
OCH527C
Case
1 A bnormal increase in power
source voltage
2 D ecrease in power source
voltage, instantaneous stop
3 D isconnection of compressor
wiring
4 M isconnection of reactor (ACL)
5 D efective outdoor power circuit
board
6 D efective reactor (ACL)
7 D isconnection or loose
connection of CN2 on the
outdoor power circuit board/
controller circuit board
1 I ncorrect switch settings on the
outdoor controller circuit board
for model select
2 D efective outdoor power circuit
board
3 D efective outdoor controller
circuit board
1 Defective outdoor fan (fan
motor) or short cycle of outdoor
unit during cooling operation
2 Defective outdoor pipe
thermistor (TH3)
3 Defective outdoor controller
board
1 Stop valve is closed.
2 Decrease of power supply
voltage
3 Looseness, disconnection or
converse of compressor wiring
connection
4 Defective compressor
5 Defective outdoor power board
6 DIP switch setting difference of
outdoor controller circuit board.
1 Disconnection of compressor
wiring
2 Defective circuit of current
sensor on outdoor power circuit
board
47
Judgment and action
12 C heck the field facility for the power
supply.
3 C orrect the wiring (U . V . W phase)
to compressor. Refer to "11-9. TEST
POINT DIAGRAM". (Outdoor power
circuit board).
4 Correct the wiring of reactor (ACL).
5 Replace outdoor power circuit board.
6 Replace reactor (ACL).
7 Check CN2 wiring.
1 Correction of a model select
2 Replace outdoor power circuit board.
3 Replace outdoor controller circuit board.
1 Check outdoor unit air passage.
23 Turn the power off, and on again to check
the check code. If U4 is displayed, follow the
U4 processing direction.
* T he check code in the parenthesis indicates
PAR-30/31MAA model.
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U V W phase) to compressor.
• •
Refer to "11-9. TEST POINT DIAGRAM".
(Outdoor power circuit board).
4 Check compressor.
Refer to "11-6. HOW TO CHECK THE PARTS".
5 Replace outdoor power circuit board.
6 Check the dip switch setting of outdoor controller
circuit board.
Refer to "Model Select" in "1) Function of switches"
in Refer to "11-10. FUNCTION OF SWITCHES,
CONNECTORS AND JUMPERS".
V W phase) to
1 Correct the wiring (U
• •
compressor. Refer to "11-9. TEST POINT
DIAGRAM". (Outdoor power circuit board).
2 Replace outdoor power circuit board.