User Manual
EM303B General Purpose Inverter
167
10.2
Fault Analysis
After power is on, due to improper function setting and incorrect wiring between inverter and
external control terminals, motor cannot meet the expected working requirements. Fault
analysis as described in this chapter can be taken as the reference to take as the corrective
actions. If trip codes appear, see 9.1 for the corrective actions to clear the trips.
10.2.1
Parameter Setting Failures
Press
/
, the parameters remain unchanged.
Some parameters can only be edited when the inverter stopped.
Press
/
, parameter changes, but they cannot be saved.
Some parameters cannot be edited since they are locked.
10.2.2
Abnormal Motor Operation
Press
RUN
button, the motor does not run.
Start/Stop is in terminal control mode: Check the setting of F0-04.
Coast-to-stop terminals FRS is connected to COM: Disconnect FRS from COM.
When the terminal (Run Command Switched to Terminal) is on, meanwhile the
run command is only in terminal control mode: Switch the terminal off.
Status combination of run command input is in terminal control mode: Change it
to keypad control mode.
Setting reference input frequency= 0: Increase reference input frequency.
Power supply is abnormal or control circuit fails.
Control terminals RUN, F/R=ON, the motor does not run.
The external terminal start/stop setting is disabled: Check the setting of F0-04.
Coast-to-stop terminal FRS=ON: Switch FRS=OFF.
Control switch is disabled: Check control switch.
Setting reference input frequency=0: Increase reference input frequency.
Motor can only run in one direction.
Reverse prohibited: When F0-24=1, the inverter reverse is prohibited.
Motor reverses
The output phase sequence of inverter is not identical to that of motor input: When
power is off, the running direction of motor can be changed by switching any of the
two connection wires at output side of inverter, or editing F0-08 when power is on.
10.2.3
Excessively Long Acceleration Time
Excessively low setting of current limit
When setting current limit is enabled, if the output current of inverter reaches its
setting current limit (FC-08), then, the output frequency will remain unchanged in the
process of acceleration, and it will rise continuously only until output current is lower
than the setting current limit. In this case, the acceleration time of motor is longer than
the setting time. Check if the setting current limit of inverter is excessively low.