Filter
Top Products
4 - 46
4 Servo Adjustment
MITSUBISHI CNC
(2) Deceleration control stop distance
The stopping distance LEMG when the motor is stopped with deceleration control during an emergency
stop can be approximated with the following expression. Note that the value will be higher than this if the
current is limited during deceleration.
F :Feedrate during emergency stop (mm/min)
rapid :Rapid traverse rate (mm/min)
PGN1 :Position loop gain 1 (SV003) (rad/s)
EMGt :Deceleration time constant for emergency stop (SV056) (ms)
1. Deceleration control will not take place when a servo alarm, for which the stopping method is
dynamic, occurs. The motor will stop with dynamic braking regardless of the parameter setting.
2. If the power fails and the deceleration time constant is set to a relatively long time, the braking
method may change from deceleration control to dynamic braking due to a drop in the bus voltage
in the drive unit.
If the deceleration control time constant (EMGt) is set to a value longer than the acceleration/
deceleration time constant, the soft limit point (stroke end point) may be exceeded.
Take care as the axis could collide the machine.
Lemg =
F
PGN1
x
60
+
1
2
x
F
60
x
F
x
EMGt
rapid 1000
(mm)
POINT
CAUTION