Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

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(A) Application parameters Parameters
5 - 534
Servo torque function until output of the orientation complete signal
Select whether or not servo torque is available 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. The shaft is fixed using the DC injection brake, and when the motor
exits the width by external force, etc., the servo torque is generated to move the motor back within
the width. Once the orientation complete (ORA) signal is output, the operation is performed as
described in
.
Retry function
Select retry function using Pr. 358. Note that the retry function cannot be used together with the
servo torque function. If the motor shaft does not stop within the in-position zone when the motor
stop is checked, orientation operation is performed again by the retry function. This retry function
is performed three times including the first orientation.The maximum retry number is three. (The
orientation fault (ORM) signal is not output during retry operation.)
Frequency compensation when the motor stops outside the orientation complete width
When the motor stops before entering the in-position width due to external force, etc., the output
frequency is increased to move the shaft to the orientation stop position. The output frequency
is gradually increased to the Pr. 352 "Creep speed". This function cannot be used with the retry
function.
DC injection brake and servo torque selection when the position pulse exits the in-position zone
after output of the ORA signal
If the motor exits the in-position width, select the setting either to fix the shaft with the DC
injection brake or by returning the motor to the orientation stop position with the servo torque.
Turning OFF the orientation complete signal (ORA) when the orientation operation is ended.
When ending the orientation operation, first turn OFF the start signal (STF or STR), and then turn
OFF the X22 signal. At this time, select when to turn OFF the ORA signal from either the time the
start signal is turned OFF or the time the orientation command signal is turned OFF.
Complete signal when the motor exits the in-position zone after output of the orientation
complete signal (ORA)
Select to turn OFF the ORA signal or to keep the ORA signal ON (ORM signal is not output) when
the motor exits the in-position width.
Position loop gain (Pr. 362) (V/F control, Advanced magnetic flux vector control)
●
When the servo torque function is selected using Pr. 358 "Servo torque selection", the output
frequency for generating servo torque gradually increases to the Pr. 352 "Creep speed" 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.