Toshiba Q9 Plus Bypass ASD Installation & Operation Manual page 227

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
f254 Motor shaft fixing control
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).
Output frequency [Hz]
DC injection braking start frequency 
Output current [A]
Operation signal (F-CC)
Operation standby signal (ST-CC)
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
Function
Set frequency
0
0
Adjustment range
0: Disabled, 1: Enabled

F-47
E6581611
Default setting
0
LED display
"" is displayed.
"" is displayed.
Time [s]

2
ON
OFF
ON
OFF
6