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Rectify interference
6 720 643 196
(2010/02)
21
2.4
Troubleshooting the inverter section
The heat pump does not run, troubleshooting the inverter section
Check
Action
1.
Is there 3x400V to the heat pump? L1--
L2, L1--L3, L2--L3=400
yes:
Æ
2
no:
B
Check the main fuse.
2.
B
Is the contactor connected?
yes:
Æ
3
no:
B
Wait for the time relay to end (9 min).
3.
B
Measure voltage on inverter circuit
board:
TBL1-TBL2, TBL2-TBL3, TBL3-TBL1=400V
OK?
yes:
Æ
4
no:
Filter circuit board or contactor defective.
4.
B
Measure voltage between zero and
miniature circuit breaker F3.
Is there 230V?
yes:
Æ
5
no:
F3 tripped or blown.
5.
B
Measure voltage between zero and
both sides on glass fuse F1 on the
transformer circuit board (PSU)
Is there 230V/phase to zero?
yes:
Æ
6
no:
Glass fuse F1 blown.
6.
B
Measure voltage between zero and
both sides on glass fuse F1 on the I/O
circuit board (IOB)
Is there 230V/phase to zero?
yes:
Æ
7
no:
Glass fuse defective.
7.
B
Check that the green LEDs on the I/O
circuit board, AHB circuit board and
the display circuit board flash (1/sec).
yes:
Æ
8
no:
B
Check 12V on CANbus.
B
Check the CANbus connections.
8.
Does the red LED on the inverter circuit
board illuminate for a few seconds after
the contactor has been connected?
yes:
Æ
10
no:
Æ
9
9.
Is there 15VDC voltage between terminal
5 and 7 on CN2?
yes:
B
Replace inverter circuit board.
no:
B
Check wiring and transformer circuit board,
replace if necessary.
Also see service message regarding I/O circuit board.
Didn’t that help?
Æ
10
10.
Is the choke coil connected to the
inverter circuit board?
yes:
B
Compare the connection with the wiring diagram,
correct if necessary
Didn’t that help?
Æ
11
no:
B
Connect the choke coil according to the wiring
diagram.
Didn’t that help?
Æ
11
Tab. 20
Summary of Contents for X Series
Page 1: ...Fault tracing tree X11 X15 6 720 619 265 18 1I 6 720 643 196 2010 02 ...
Page 26: ...6 720 643 196 2010 02 26 Notes ...
Page 27: ...6 720 643 196 2010 02 27 ...
Page 28: ......