MITSUBISHI ELECTRIC FR-S520 - Manual (Page 157)

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3
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
PU
EXT
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.