Mitsubishi Electric FR-A700 Technical Manual page 393

Servo torque selection [Pr. 358]
Valid only under V/F control and Advanced magnetic flux vector control.
Function
1) Servo torque function selection
until output of the orientation
complete 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 motor
stops outside of the in-position
zone after output of the orientation
complete signal (ORA)
5) End switch selection of the DC
injection brake and orientation
complete signal (ORA)
6) Completion signal OFF selection
when the position pulse stops
outside of in-position zone after
output of the orientation completion
signal (ORA)
*1 When the orientation command is OFF with the start signal ON, the speed accelerates to the command speed.
*2 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 rotates 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
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 orientation in-position zone
When the shaft stops rotation before entering the
in-position zone due to external force, etc., output
frequency is increased to rotate 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
[Pr. 358] Setting
0 1 2 3 4 5 6
× ×
× × × × × × ×
× × ×
× × × ×
× ×
× ×
function, three orientations
7 8 9 10 11 12 13
× × × ×
× :
× × × × ×
× :
× × × × ×
× :
× :
× × × × ×
× :
× :
× × × × × × ×
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 or end switch operation
selection
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
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.
Position loop gain [Pr. 362]
When servo torque function is selected using [Pr.
358 Servo torque selection], output frequency for
generating servo torque increases to the creep
speed of [Pr. 352 Creep speed] gradually according
to the slope set in [Pr. 362 Orientation position loop
gain].
Although the operation becomes faster when the
value is increased, a machine may hunt, etc.
427
PARAMETER
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
:
turns OFF the completion signal
when the position pulse stops outside
of the in-position zone
completion signal remains ON even if
the position pulse stops outside of the
completion zone
(orientation fault signal (ORM) is not
output)
to turn OFF the orientation
2