Sinclair SCV-750EB Service Manual page 83

Procedure
The phase sequence of the 3-phase power
supply is incrorrect
Power supply phases lose
Some power supply terminals are loose
The power supply is abnormal
Power phase protector wire connection
Replace power phase protector
Notes:
1. The red LED on the power phase protector will on.
2. The red LED on the power phase protector will flash with 1HZ.
3. The A, B, C terminals of 3-phase power supply should match compressor phase sequence requirements. If the phase sequence is inverted, the compressor
will operate inversely. If the wiring connection of each outdoor unit is in A, B, C phase sequence, and multiple units are connected, the current difference
between C phase and A, B phases will be very large as the power supply load of each outdoor unit will be on C phase. This can easily lead to tripped
circuits and terminal wiring burnout. Therefore if multiple units are to be used, the phase sequence should be staggered, so that the current is distributed
among the three phases equally.
4. The red LED on the power phase protector will flash with 3HZ. Loose power supply terminals can cause the compressor to operate abnormally and
compressor current to be very large.
5.
For SCV-750EB and SCV-1400EB, wire connected to port CN28 on the main PCB. For SCV-900EB and SCV-1800EB, wire connected to port CN91 on the main
PCB. (labeled 34 in Part 4, 2.2.1 Main PCB component)
E8
1
No
2
No
No
4
No
loose 5
No
No
Replace Main PCB
Yes
Exchange any two of the 3 phase wires
Yes
Ensure all power supply phases is complete
Ensure all supply terminals are securely
Yes
3
Yes
Check the power supply equipment
Check the wire connection of Power phase
Yes
Yes
fastened
protector
Error code disappear
81