User Manual
EM303A General Purpose Inverter
125
9.2 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
requirement. 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.
9.2.1 Parameter Setting Failures
z
Press UP/DOWN button, the parameters remain unchanged.
Some parameters can only be edited when the inverter stopped.
z Press UP/DOWN button, parameter changes, but they cannot be saved.
Some parameters cannot be edited since they are locked.
9.2.2 Abnormal Motor Operation
z
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, the run
command is only in terminal control mode at mean time: 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.
z 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.
z Motor can only run in one direction.
Reverse prohibited: When F0-24=1, the reverse is prohibited.
z 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, or editing F0-08 when power is on.
9.2.3 Excessively Long Acceleration Time
z
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
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