E6581611
F-47
6
6.12.2 Motor shaft fixing control
f254 : Motor shaft fixing control
Function
This function is used to preheat the motor or to prevent the motor from running unexpectedly when its
shaft is not restrained.
[Parameter setting]
Title Function Adjustment range Default setting
f254
Motor shaft fixing control 0: Disabled, 1: Enabled 0
If the motor shaft fixing control f254 is set to 1, half amount of the braking force set with f251 (DC
braking rate) will make the motor continue DC braking even after the completion of ordinary DC braking. To
stop motor shaft fixing control, turn off the standby command (ST signal).
DC injection braking start
frequency
LED
display
Time [s]
Output frequency [Hz]
Operation signal (F-CC)
ON
OFF
Output current [A]
0
0
Set frequency
Operation standby signal (ST-CC)
ON
OFF
2
“
” is displayed.
“
” is displayed.
As the default setting for ST (Standby) is Always ON, change the following settings:
(no function)
Assign 6: ST (Standby) to an open input terminal.
Note1: Nearly the same motor shaft fixing control can be exercised when entering a DC braking command with the
signal at an input terminal.
Note2: If a power failure occurs during motor shaft fixing control and the motor starts to coast, motor shaft
fixing control will be canceled.
Also, if the inverter trips during motor shaft fixing control and is restored to working order by the retry
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