TECO JNEV-401~403-H3 - Figure 5-2 OC, OL Fault Troubleshooting

Chapter 5 Trouble shooting and maintenance
5-9
Troubleshooting for OC, OL error displays
Is the main circuit
I.G.B.T. working
properly?
A
ny
abnormalities in
appea
r
a
n
ces?
Any faults?
Replace the current sensing
circuit
The inverter displays OC, OL errors
Apply powe
r
Input operation commands
Replace I.G.B.T
Replace faulty circuit boards
Is the current
detector OK?
Replace the control board
Replace the control board
N
O
N
O
YES
YES
Input frequency command.
I
s t
h
e output
f
requency
of the operating unit
displayed?
Are there voltage
outputs at T1, T2, and
T3 output terminals?
Connect the motor to run.
A
ny
f
au
l
ts
displayed?
Are output
currents of each
p
hase even?
The inverter’s output is OK
Replace the control board
Replace the control board
Is the control board
working after
replacement?
Perform detailed fault checks
YES
YES
YES
YES
N
O
N
O
N
O
N
O
NO
YES
•
YES
YES
Yes
No
No
The output frequency
of the operating unit
display?
No
Yes
Fi
g
ure 5-2 OC
,
OL fault troubleshootin
g