Mitsubishi Electric FR-A700 Instruction Manual page 458

Motor brake and stop operation
● Servo torque selection (Pr. 358)
Valid only under V/f control and advanced magnetic flux vector control.
Function
Servo torque function selection
until output of the orientation com-
pletion signal (ORA)
Retry function selection
Output frequency is compensated
when the motor stops outside the
in-position zone c
DC injection brake and servo tor-
que selection when the position
pulse comes off the in-position
zone after output of the orientation
completion signal (ORA)
End switch selection of the DC
injection brake and orientation
completion signal (ORA)
Completion signal off selection
when the position pulse comes off
the in-position zone after output of
the orientation completion signal
(ORA)
Tab. 6-77: Settings of parameter 358
NOTES
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).
Descrition of the functions listed in Tab. 6-77.
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).
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 func-
tion.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).
6 - 278
Pr. 358 Setting
0 1 2 3 4 5 6
× ×
× × × × × × ×
× × ×
× × × ×
× ×
× ×
7 8 9 10 11 12 13
× × × ×
× × × × ×
× × × × ×
× × × × ×
× × × × × × ×
Parameter
Remarks
: With servo torque function
×: Without servo torque function
: With retry function
×: Without retry function
: With frequency compensation
×: Without frequency compensa-
tion
: 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 (orien-
tation fault singal (ORM) is not
output)