Outdoor Fan Pcb Overvoltage / Low Voltage Error - Samsung AM072/096/120/144FXVAFH Service Manual

4-4-52 Outdoor Fan PCB Overvoltage / Low voltage error

Outdoor unit display
Judgment Method
∙ DC-Link Overvoltage / Low voltage occurs.
Cause of problem
∙ Check the status of DC LINK Connector
1. How to check
Be careful when you check DC voltage.(600Vdc
How to check voltage from DC LINK connector disconnect from FAN PCB
Turn off the MAIN Power
Disconnect the DC LINK connector from FAN PCB
Turn on the MAIN Power
Check voltage of connector
Standard voltage range of DC and AC
Standard
AC Voltage(Vac)
AC Input Voltage
Min.
208~230V 187
460V 414
380~415V 342
Check AC Voltage
of the Power terminal?
[Refer to Standard AC Voltage ]
OK
Check DC voltage of
DC LINK connector disconnect from FAN PCB
[Refer to Standard DC Voltage]
OK
Check the status of DC LINK Connector
OK
Replace FAN PCB
Samsung Electronics
)
Standard
DC Voltage(Vdc)
Max. Min. Max.
253 265 358
506 585 715
457 484 646
(If the voltage is out of Std. range)
NG
NG
(If the voltage is out of Std. range)
NG
Check AC Voltage of Power source
Replace connected wire
DC power wire (Inv. PCB)
Troubleshooting
DC power wire (Fan PCB)
4-111