Sinclair SCV-1400EB, Service Manual

Page: 125 / 160

123
For SCV-900EB and SCV-1800EB
H5
ODU power supply voltage at or above
265V or drops below 170V or a phase is
missing 1
Yes
Provide normal power supply
No
Wires between outdoor main PCB, AC filter
boards and electric control box power
supply terminals are loose
2
Yes
Ensure the wires are connected properly
No
High voltage circuit error has occurred,
such as the compressor has
malfunctioned 3 , the fan motor has
short-circuited 4 , or the inverter module has
short-circuited
5
Yes
Replace or repair the relevant parts
No
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”.