S1 series standard inverter
-161-
7.5.2 Other state
Displayed code
State type
Possible cause
Solution
PoFF
System power
failure
The system is powered off or
the bus voltage is too low.
Check the grid
conditions.
Note:
After set the RO terminal function as function 5 (inverter fault), it will send the signal to the
contactor to cut off the input power when inverter reports ETH (ground short circuit fault) or other
faults.
7.6 Analysis on common faults
7.6.1 Motor fails to work
Motor fails to work
Whether the POWER
indicator is on?
Whether the keypad
displays information?
Whether the air switch
and EM contactor on the
input side are closed?
Close the air
contactor
Check the voltage
of RST with a
multimeter
Inverter fault
Check the voltage
of the grid
Whether fault information
is displayed?
Identify the channel of
running commands
Press RUN to run
Running
properly
Rectify the fault
based on the
fault inforamtion
Running
properly
Running
properly
Whether the speed
command is set
properly?
Normal
running
Check the voltage of
UVW with a multimeter
Inverter fault
Whether the motor is
properly wired?
Wire the motor
properly
Whether the load is too
heavy?
Reduce the load if
the motor is locked
due to heavy loads
Motor fault
Yes
No
No
Yes
Yes
Normal
Yes
Yes
Normal
Exception occurs
normal
Communication
Terminal
Keypad
Yes
Exception occurs
No
No
No
No
No
No
Normal
Normal
Exception occurs
Yes
Normal
Exception occurs
Yes
Check whether the input terminal
is in the correct state
Whether it runs
properly after the
parameters are
reset?
Whether the
communication wiring
is performed properly?
Whether communication
parameters are properly set?
Running
properly
Normal
Exception occurs
Whether it runs
properly after the
terminal is closed?
Exception occurs
Whether it runs properly after the
speed command is properly set?
