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9. Adjustment
9 - 30
(2) Dynamic braking stop
Dynamic braking stop takes place if an alarm for which dynamic braking stop is set as the stopping
method occurs. With dynamic braking stop, the dynamic brakes activate simultaneously with the
occurrence of an emergency stop. The motor brake control output also activates simultaneously.
Emergency stop occurrence
Time
Motor speed
OFF
ON
Dynamic brake
OFF
ON
Motor brake control output (MBU)
CAUTION
The dynamic brakes cannot be used for normal braking.
If the dynamic brakes activate continuously, the internal regenerative resistor
could burn, so always eliminate the cause of the emergency stop before
resuming operation.
(3) Deceleration control stop distance
The stopping distance LEMG to stop the motor 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. Refer to section "3-2-3 (2) Coasting rotation distance during
emergency stop" for the stopping distance when using dynamic brakes.
F 1 F F×EMGt
LEMG =
PGN1×60
+
2
×
60
×
rapid×1000
(mm)
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)