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3G3JV Maintenance Operations Chapter7
7-2 Troubleshooting
Due to parameter setting errors, faulty wiring, and so on, the Inverter and motor
may not operate as expected when the system is started up. If that should occur, use
this section as a reference and apply the appropriate measures.
Refer to
7-1 Protective and Diagnostic Functions, if the contents of the fault are
displayed,
7-2-1 Parameters Fail Set
The display does not change when the Increment or Decrement
Key is pressed.
• Parameter write-prohibit is input.
This occurs when n01 for parameter write-prohibit selection/parameter initialization is set to 0.
Set n01 to an appropriate value according to the parameter to be set.
• The Inverter is operating.
There are some parameters that cannot be set during operation. Refer to the list of
parameters. Turn the Inverter
off and then make the settings.
The Digital Operator does not display anything.
Turn the Inverter off and on. If the Digital Operator still does not display anything, the internal
circuitry of the Inverter must have failed. Replace the Inverter.
7-2-2 Motor Fails to Operate
The motor does not operate with input through the control
circuit terminals even though the frequency reference is
correct.
• The operation method setting is incorrect.
If parameter n02 for operation mode selection is not set to 1 to enable the control circuit
terminals, the RUN command cannot be executed through the control circuit terminals.
Check and correct the setting in n02.
• Input in 2-wire sequence while 3-wire sequence is in
effect and vice-versa.
The Inverter will operate in 3-wire sequence according to the RUN, stop, and forward/stop
commands if n37 for multi-function input 2 is set to 0. At that time, the Inverter will not operate
if input in 2-wire sequence is ON. On the other hand, the Inverter in 2-wire sequence will
only rotate in the reverse direction if input in 3-wire sequence is ON.
Check and correct the setting in n37 or change the input method of the RUN command.
• The Inverter is not in RUN mode.
When the PRGM or LO/RE indicator (red indicator) of the Digital Operator is lit, the Inverter
does not start.
Cancel the RUN command, press the Mode Key to change the mode of the Inverter, and restart
the Inverter with the green indicator lit.
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