70
b.
Troubleshooting Procedure
(1)
Motor doesn't run
Is there any
display on
keyboard?
Is inverter under
"RUN" command?
Is there any fault
showing on
display?
Is there any output
on T1(U), T2(V),
and T3(W)?
Are output voltages
T1(U), T2(V),
T3(W) balanced?
*Motor overloaded or shaft locked
*Motor is damaged
*Defective wiring
Is the input power
L1(R), L2(S), L3(T)
stable?
Can MCCB be
turned on?
Is MCCB on?
Press "RUN" to
operate motor
Refer to fault
indication to do
troubleshooting
-Unstable power
source
-Defective wiring
Inverter damaged
Short circuits
Inverter damaged
Inverter damaged
Are parameters set
correctly?
Correct param-
eters
NO
YES
YES
YES
YES
YES
NO
YES
YES
NO
NO
NO
NO
NO
NO
NO
The output voltage is balanced when it is +/- 3% of maximum
output voltage without load.
*1 Without keypad, check if LED 101 is on.
YES
NO
*1
DANGER!
Hazardous voltage within can cause serious injury or death.
Operating drive from keypad may disable safety circuits and
result in danger or injury. Only qualified personnel should work
on this equipment after familiarization with its operation. Turn
OFF and lock out power at main panel. Allow capacitors to bleed
off prior to servicing.