Mitsubishi Electric FR-S500 Series Instruction Manual page 74

7.6.8 Operation mode is not changed properly
If the operation mode does not change correctly, check the following:
1. External input signal
2. Parameter setting
7.6.9 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.
7.6.10 Parameter write cannot be performed
Make sure that operation is not being performed (signal STF or STR is not ON).
Check that the
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".
7.6.11 Motor produces annoying sound
Check the Pr. 70 "Soft-PWM setting" and Pr. 72 "PWM frequency selection"
settings.
Make sure that the deceleration time is not too short.
............ Check that the STF or STR signal is off.
When it is on, the operation mode cannot be
changed.
................ 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
mode.
For other settings (1 to 8), the operation mode
is limited accordingly.
(For details of Pr. 79, refer to page 46.)
( ) was pressed.
WRITE
SET
PU
to switch to the PU operation
EXT
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Troubleshooting
7