Mitsubishi FR - S500 Operation mode is not changed properly, Parameter write cannot be performed

3.2.8 Operation mode is not changed properly

If the operation mode does not change correctly, check the following:

1. External input signal		......... Check that the STF or STR signal is off.
		When it is on, the operation mode cannot be
		changed.
2. Parameter setting	............. Check the Pr. 79 setting.
		When the Pr. 79 "operation mode selection"
		setting is "0", switching input power on
		places the inverter in the external operation
		mode. Press the EXTPU key to switch to the
		PU operation mode.
		For other settings (1 to 8), the operation
		mode is limited accordingly.
		(For details of Pr. 79, refer to page 98.)

3.2.9 Operation panel display is not operating

Make sure that terminals PC-SD are not shorted.

Make sure that the connector is fitted securely across terminals P<+>-P1.

3.2.10 Parameter write cannot be performed

Make sure that operation is not being performed (signal STF or STR is not ON).

Check that the SET key ( WRITE key) was pressed.

Make sure that you are not attempting to set the parameter outside the setting range.

Make sure that you are not attempting to set the parameter in the external operation mode.

Check Pr. 77 "parameter write disable selection".

3.2.11 Motor produces annoying sound

Check the Pr. 72 "PWM frequency selection" setting.

Make sure that the deceleration time is not too short.

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