Forced Stop Deceleration Function; Setting Method [G] [Wg] - Mitsubishi Electric MR-J5 Series User Manual

3.13

Forced stop deceleration function

Forced stop deceleration function is a function that decelerates the servo motor with commands when EM2 (Forced stop 2) is
turned off, and stops the servo motor with the dynamic brake when the servo motor rotates at the zero speed or less. This
enables the servo motor to stop with shorter coasting distance than stopping only with dynamic brake. When the forced stop
deceleration function is activated, [AL. 0E6 Servo forced stop warning] is shown in the display. The amount of time to reach 0
[r/min] or [mm/s] from the rated speed and the range of zero speed detection range can be set with the servo parameters.
[G] [WG]: Quick stop enables forced stop deceleration function to be operated even by commands from network. Refer to the
following.
Page 118 Quick stop [G] [WG]
• In the torque mode, the forced stop deceleration function cannot be used.
Precautions
• The forced stop deceleration does not operate on alarms that are not subject to the forced stop deceleration function.
• When the network communication is shut off, forced stop deceleration operates. Refer to the following.
Page 99 When network communication shut-off or communication time-out has occurred [G] [WG]
• During normal operation, do not use EM2 (Forced stop 2) to alternate stop and drive. The servo amplifier life may be
shortened.
• If an alarm that operates the dynamic brake occurs during forced stop deceleration, the braking distance until the servo
motor stops will be longer than the braking distance of when the forced stop deceleration is properly operated.
• If STO is turned off during forced stop deceleration, the dynamic brake stops the servo motor, which may shorten the life of
the dynamic brake relay.

Setting method [G] [WG]

Set [Pr. PA04.3 Forced stop deceleration function selection] to enable/disable the forced stop deceleration function. Setting
[Pr. PA04.3 Forced stop deceleration function selection] to "2" (Forced stop deceleration function enabled) operates forced
stop deceleration function when EM2 (Forced stop 2) is turned off. In addition, set the level of ZSP (Zero speed detection) and
the amount of time to reach 0 [r/min] or [mm/s] from the rated speed, by using [Pr. PC07 Zero speed] and [Pr. PC24
Deceleration time constant at forced stop].
Servo parameter
PA04.3
PC07
PC24
3 BASIC FUNCTION
100
3.13 Forced stop deceleration function
Symbol Name
*AOP1 Forced stop
deceleration function
selection
ZSP Zero speed
RSBR Forced stop
deceleration time
constant
Outline
Set "Forced stop deceleration function" for enabled/disabled.
0: Forced stop deceleration function disabled (EM1 is used)
2: Forced stop deceleration function enabled (EM2 is used) (initial value)
Set the level of ZSP (Zero speed detection).
Initial value: 50 [r/min], [mm/s]
Set the deceleration time constant at forced stop.
Initial value: 100 [ms]