Mitsubishi Electric MELSERVO-J4 Series Transition Handbook page 141

Part 3: Review on Replacement of MR-J3-_B_ with MR-J4-_B_
No. Name and function
PC24 For manufacturer setting
Do not change this value by any means.
PC29 For manufacturer setting
Do not change this value by any means.
PC31 For manufacturer setting
Do not change this value by any means.
MR-J3-_B_
Initial
No.
value
0000h PC24 Forced stop deceleration time constant
This is used to set deceleration time constant when you
use the forced stop deceleration function.
Set the time per ms from the rated speed to 0 r/min.
Setting "0" will be 100 ms.
Rated speed
Servo motor speed
0 r/min
[Precautions]
If the servo motor torque is saturated at the maximum
torque during forced stop deceleration because the set
time is too short, the time to stop will be longer than
the set time constant.
[AL. 50 Overload alarm 1] or [AL. 51 Overload alarm 2]
may occur during forced stop deceleration, depending
on the set value.
After an alarm that leads to a forced stop deceleration,
if an alarm that does not lead to a forced stop
deceleration occurs or if the control circuit power
supply is cut, dynamic braking will start regardless of
the deceleration time constant setting.
Set a longer time than deceleration time at quick stop
of the controller. If a shorter time is set, [AL. 52 Error
excessive] may occur.
0000h PC29 Function selection C-B
This is used to select the POL reflection at torque control.
_ _ _ x:
For manufacturer setting
_ _ x _ :
For manufacturer setting
_ x _ _ :
For manufacturer setting
x _ _ _ :
POL reflection selection at torque control
0: Enabled
1: Disabled
0000h PC31 Vertical axis freefall prevention compensation amount
Set the compensation amount of the vertical axis freefall
prevention function.
Set it per servo motor rotation amount travel distance.
When a positive value is set, compensation is performed
to the address increasing direction. When a negative
value is set, compensation is performed to the address
decreasing direction.
The vertical axis freefall prevention function is performed
when all of the following conditions are met.
1) Position control mode
2) The value of the parameter is other than "0".
3) The forced stop deceleration function is enabled.
4) Alarm occurs or EM2 turns off when the servo motor
speed is zero speed or less.
5) MBR (Electromagnetic brake interlock) was enabled in
[Pr. PD07] to [Pr. PD09], and the base circuit shut-off
delay time was set in [Pr. PC02].
3 - 40
MR-J4-_B_
Name and function
Dynamic brake
Forced stop deceleration deceleration
[Pr. PC24]
Initial
value
100
0h
0h
0h
0h
0