Sinclair SCV-750EB Service Manual page 125

For SCV-900EB and SCV-1800EB
ODU power supply voltage at or above
265V or drops below 170V or a phase is
Wires between outdoor main PCB, AC filter
boards and electric control box power
supply terminals are loose
High voltage circuit error has occurred,
such as the compressor has
malfunctioned
short-circuited
Replace outdoor main PCB
Notes:
1. The normal voltage between A and N, B and N, and C and N is 207-253V.
2. Refer to Part 4, 3 "Wiring diagram" and PCB components to make sure wire connection is firm.
3. The normal resistances of the inverter compressor is 0.124Ω(at 20℃ ambient temperature) among U V W and infinite between each of U V W and ground.
If any of the resistances differ from these specifications, the compressor has malfunctioned.
4. The normal resistances of the fan motor coil among U V W are less than 15Ω. If a measured resistance is 0Ω, the fan motor has short-circuited.
5. Set a multi-meter to buzzer mode and test any two terminals of P N and U V W of the inverter module. If the buzzer sounds, the inverter module has
short-circuited. Refer to Part 4, 1 "Outdoor Unit Electric Control Box Layout".
H5
missing 1
No
2
No
3 , the fan motor has
4 , or the inverter module has
short-circuited 5
No
Yes
Provide normal power supply
Yes
Ensure the wires are connected properly
Yes
Replace or repair the relevant parts
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