Mitsubishi Electric FR-A720-0.4K Instruction Manual page 227

Servo torque selection (Pr. 358 )
Valid only under V/F control and advanced magnetic flux vector control.
Pr. 358 Setting
Function
1) Servo torque function selection
until output of the orientation
completion signal (ORA)
2) Retry function selection
3) Output frequency is compensated
when the motor stops outside the
in-position zone
4) DC injection brake and servo
torque selection when the position
pulse comes off the in-position
zone after output of the orientation
completion signal (ORA)
5) End switch selection of the DC
injection brake and orientation
completion signal (ORA)
6) Completion signal off selection
when the position pulse comes off
the in-position zone after output of
the orientation completion signal
(ORA)
REMARKS
• When the orientation command is off with the start signal on, the speed accelerates to the command speed.
• When the motor shaft stops outside of the set setting range of stop position, the motor shaft is returned to the stop position by
servo torque function (if enough torque is generated).
1) Servo torque function selection until output of the orientation completion signal
Whether servo torque is available or not is selected using Pr. 358 Servo torque selection. Servo torque is not generated
if the current position pulse is in between the orientation stop position and DC injection brake start position. Although,
the shaft is retained by the DC injection brake, servo torque is generated to return the shaft within the width if the
shaft moves out of the width by external force, etc. Once the orientation completion signal (ORA) is output, the motor
runs according to the setting made in 4).
2) Retry function selection
Select retry function using Pr. 358 Servo torque selection . Note that servo torque function can not be used together.
When the motor shaft is not stopped within the in-position zone when the motor stop is checked, orientation
operation is performed again by retry function.
With this retry function, three orientations including the first one are performed. More than three times retry
operations are not made. (The orientation fault signal (ORM) is not output during retry operation)
3) Frequency compensation function when the motor stops outside the orinetation in-position zone
When the motor stops before entering the in-position zone due to external force, etc., output frequency is increased
to move the shaft to the orientation stop position. The output frequency is gradually increased to the creep speed of
Pr. 352 Creep speed .
Note that retry function can not be used together.
4) DC injection brake and servo torque selection when the position pulse comes off the in-position zone after output of
the orientation completion signal (ORA)
If the position pulse comes off the orientation in-position width, you can select a setting either fixing a shaft with the
DC injection brake or returning the motor to the orientation stop position with servo torque.
5) Orientation operation end switch operation selection between DC injection brake or servo torque
When ending the orientation operation, turn off the start signal (STF or STR), then turn off the orientation command
(X22). At this time, you can select when to turn off the orientation completion signal (ORA) from between at turning
off of the start signal or turning off of the orientation command signal.
6) Selection of completion signal off or on when the motor stops outside of the in-position zone after output of the
orientation completion signal (ORA)
You can select the mode to turn off the completion signal or keep the completion signal on (orientation fault signal
(ORM) is not output) when the motor stops outside of the in-position zone.
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Motor brake and stop operation
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Remarks
With servo torque function
Without servo torque function
With retry function
Without retry function
With frequency compensation
Without frequency compensation
With DC injection brake
With servo torque
When the start signal (STF, STR) or
orientation command is turned off
When the orientation command is
turned off
Turnes off the completion signal when
the motor stops outside of the in-
position zone
Completion signal remains on even if
the position pulse comes off the
completion zone
(orientation fault singal (ORM) is not
output)
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