Check
three-phase input
power supply is normal
Whether
Yes
Yes
Check
the drive board is normal
Whether
Check
the main control
board is normal
Whether
Replace the
main control
board
Replace the
drive board
Check and resolve the problems in the
external lines to ensure that the three
-phase power input to the inverter is
normal
No
No
No
Ask for technical support
8.2 Common fault and resolution
During the
inverter, you may encounter
the following faults. Please conduct simple fault analysis by
referring to the methods below
using process of
：
1
No display upon power-on
、
：
3
The circuit breaker starts aside after power-on
、
：
If the communication between keyboard and main control board
has something wrong , you need to check whether the keyboard or
main control board or it's connection is normal .
2
The operation panel displays the words
CE
upon
power-on
、
“
”
：
5
The inverter displays normally upon power-on , but
the circuit breaker starts aside upon running
、
：
4
The motor does not rotate upon inverter running
、
：
1
Use multimeter to measure whether
is
consistent with the rated voltage
of inverter. If the power is faulty, please perform it .
）
the input power
2
Check
the rectifier is good, if it is damaged
, please ask for technical support.
）
whether
3
Check
the start resister is good, if it is good
, the fault might be in switching power supply ,please
ask for technical support.
）
whether
2
Check whether there is grounding or short circuited
things between the input power, please remove it if there is.
）
2
Check whether there is grounding or short circuit
things between the motor cables, remove it if there is.
）
1 Check whether the earth terminal E of inverter is grounding
reliably and perform the problem .
）
3
Check the rectifier whether it is punctured , if it is ,please
ask for technical support .
）
1
among U
and V and W, if it has, there is something wrong with the motor
circuit or it is damaged or the motor blocked for mechanical
reasons. Please remove it.
）
Whether it has balanceable three-phase output
2
There is output but it is not balanceable , the reason
might be the drive or module of inverter is damaged .
Please ask for technical supply .
）
3
If there is no output voltage , the reason might be the
drive board or output module is damaged. Please ask for
technical supply .
）
1
Check
between the output
modules. If there is, please ask for technical supply.
）
whether there is
double phase short circuit or grounding
3
If the trip happens every once in a while and the distance
is too long, then you may consider
to install an AC output reactor.
）
between motor and inverter
Phase loss at the input side
E.5
87
Chapter 8 Troubleshooting and Countermeasures
