N3 fault
Replace control board
No
Set up frequency command
Check inverter parameters
Is the frequency displayed on the
digital operator ?
No
Yes
Connect the motor and run
Any fault displays ?
Yes
The inverter is faulty.
Perform a detailed check.
No
Yes
Inverter is functioning normally
No
Fig. 22.1 Fault Display Troubleshooting Cont.
Initialize parameters
Specify operation control mode
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Fwd or Rev LED
flashing ?
Replace control board
Yes
Is there motor output voltage at
terminals U, V & W ?
Replace control board
No
Yes
Does the control board
function normally after
replacement ?
Yes
Are the output currents of each
phase balanced ?
No
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