TECO JNEV-401~403-H3 - Page 81

Chapter 5 Trouble shooting and maintenance
5-10
Troubleshooting for OV, LV error display
The inverter displays OV. LV
I
s t
h
e ma
i
n
circuit fuse
intact?
Apply power
Fault message
Input operation commands
Input frequency commands
I
s t
h
e output
f
requency
of the operating unit
displayed?
Are there outputs on
output terminals T1, T2,
and T3?
motor running
Any Fault
Message
Are currents of
all phases
even?
The inverter is OK
Replace the main circuit board
Replace the control board
Replace the control board
Replace the control board
Is the inverter
working after
replacement?
Perform detailed Fault checks
YES
YES
YES
YES
N
O
N
O
N
O
N
O
NO
YES
•
YES
Yes
No
No
Figure 5-3 OV, Fault Troubleshooting