Overvoltage / Low Voltage Error - Samsung AM072FXVAFH series Service Manual

4-4-48 Overvoltage / Low voltage error

Outdoor unit display
∙ Input wiring error EMI Fuse open.
Judgment Method
∙ DC-Link Overvoltage / Low voltage occurs.
∙ Check the input wiring
Cause of problem
∙ EMI Fuse OPEN
1. How to check
Power Off
Is Power connection accurately conected
Is EMI PCB R,S,T Wire and Terminal-block
connector accurately connected?
Did the Fuse is open
Is Reactor accurately connected
Is Inverter PCB R,S,T Wire and EMI PCB CN21
connector accurately connected?
Replace Inverter PCB
Type of Power Source
F
J
Samsung Electronics
(INVERTER1 PCB)
(INVERTER2 PCB)
Yes
Yes
Yes
Yes
Yes
Standard AC Voltage(Vac)
AC Input Voltage
Min.
208~230V 177
460V 391
No
Power Cable re-connection
No
Check the connector
connection
No
Replace Fuse or EMI PCB
No
Check the Reactor
connection
No
Power Off and then
re-connection
Max.
265
552
Troubleshooting
EMI PCB R,S,T Wire and
Terminal-block connector
Standard DC Voltage(Vdc)
Min. Max.
250 374
553 781
4-103