Service manual

13-10
TROUBLESHOOTING
SM CINCO 1-A.1 GB
13.5 Procedures for checking Main Parts
13.5.1 Discharge DC Voltage
13.5.2 Checking Mains Voltage
Confirm that the Mains voltage is between 198 and 264 VAC. If Mains voltage is out of this range, abnormal operation of
the system is expected. If in range, check the Power (Circuit) Breaker and look for broken or loosed cable lugs or wiring
mistakes.
13.5.3 Checking Line Filter Board
Check for any burn signs on the filter board and its coils and relays, replace if any.1)
Check voltage at the inlet and outlet of the line filter. If no output voltage, replace line filter.2)
In case of burnt main fuse in line filter 3) – replace both Line filter and driver.
Replacing line filter - (14.1.16)
13.5.4 Checking Compressor Driver
In normal operation the red led in ON continuously and green led is blinking slow (1 time/sec).
Even is that case, there can still be a Hardware problem that prevents the system to perform well or at all. If no other
problem is found, replace the driver.
1) In case green and/or red leds are OFF (one or both):
Check power supply to driver connected well and no burn marks on wiring.
PFC chock is connected well. Correct if needed.
Check PFC Chock (  13.5.5). Replace chock if needed.
Check line filter and main fuse (20A). In case fuse is burnt, replace both driver and filter.
Check fuse on driver (3.15A). In case fuse is burnt, replace driver.
If all is well but still leds are OFF, Replace driver.
Replacing Driver – (14.1.15).
13.5.5 Checking PFC Chock coil
Check PFC chock connections – repair if needed.1)
Visually check to see any burn marks on the wires – replace the chock(s) if needed.2)
Disconnect the chock from the driver and check if the 2 ending wires of each chock are shorted (continuity check) – if 3)
they are NOT shorted replace the chock(s), if they are shorted – check the driver ( 13.5.4).
Replacing PFC chock - (14.1.17)
13.5.6 Checking fuse on Main Board
If the 3.15A fuse on the main Board is burnt check the outdoor fans or any other peripheral that can cause a short:
In case of a problematic peripheral - replace it. 1)
In case no problematic peripheral replace the burnt fuse.2)
In case of frequent burning fuse, replace the controller.3)
Replacing main board - (14.1.13)
High voltage!!!
Wait for DC voltage to be discharged beforere touching any part of the driver to
avoid electric shock.
Check to ensure that DC voltage has reduced to below 50VDC, if not, keep
waiting until it does.