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Troubleshooting
8-2
Troubleshooting
8-2-1
Parameters Fail Set
The display does not change when the Increment or Decrement Key is pressed.
Parameter write-prohibit is
input.
The Inverter is operating.
The Digital Operator does
not display anything.
8-2-2
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.
Input in 2-wire sequence
while 3-wire sequence is
in effect and vice-versa.
The Inverter is not in RUN
mode.
The frequency reference
is too low.
The Inverter is in local
mode.
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 8-1 Protective and Diagnostic Functions, if the contents of the fault
are displayed.
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.
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.
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.
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.
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.
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.
If the frequency reference is set below the minimum output frequency set
in n14, the Inverter will not operate.
Raise the frequency reference to at least the minimum output frequency.
The Inverter in local mode starts with the RUN command given with the
RUN Key pressed.
Check the LO/RE indicator. If the display is "Lo," the Inverter is in local
mode. Press the Increment Key and set the Inverter to remote mode with
"rE" displayed.
If the above operation is not possible, a multi-function input is set to local/
remote selection. In that case, the mode can be changed with the multi-
function input only. Turn the corresponding input terminal OFF so that the
Inverter will be set to remote mode.
Chapter 8-2
123
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