Mitsubishi Electric MELSERVO-J3 Series Handbook page 189

Part 4: Replacement of MR-J3W-_B with MR-J4W2-_B
No. Name and function
PC20 This parameter is not used. Do not change the value.
PC21 Alarm history clear
Used to clear the alarm history.
0 0 0 x:
Alarm history clear
0: Invalid
1: Valid
When alarm history clear is made valid, the alarm
history is cleared at next power-on.
After the alarm history is cleared, the setting is
automatically made invalid (reset to 0).
PC24 This parameter is not used. Do not change the value.
MR-J3W-_B
Initial
No.
value
0000h PC20 Function selection C-7
Select the detection method of [AL. 10 Undervoltage].
_ _ _ x:
For manufacturer setting
_ _ x _ :
For manufacturer setting
_ x _ _ :
Undervoltage alarm selection
Select the alarm/alarm and warning for when the bus
voltage drops to the undervoltage alarm level.
0: [AL. 10] regardless of servo motor speed
1: [AL. E9] at servo motor speed 50 r/min (50 mm/s) or
less, [AL. 10] at over 50 r/min (50 mm/s)
x _ _ _ :
For manufacturer setting
0000h PC21 Alarm history clear
Used to clear the alarm history.
_ _ _ x:
Alarm history clear selection
0: Disabled
1: Enabled
When "Enabled" is set, the alarm history will be cleared
at the next power-on. Once the alarm history is cleared,
the setting becomes disabled automatically.
_ _ x _ :
For manufacturer setting
_ x _ _ :
For manufacturer setting
x _ _ _ :
For manufacturer setting
0000h PC24 Forced stop deceleration time constant
Set a deceleration time constant when you use the
forced stop deceleration function.
Set the time per ms from the rated speed to 0 r/min or 0
mm/s. Setting "0" will be 100 ms.
Rated speed
Servo motor speed
(Linear servo motor
speed)
0 r/min
(0 mm/s)
[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 of the
controller. If a shorter time is set, [AL. 52 Error
excessive] may occur.
4 - 44
MR-J4W2-_B
Name and function
Dynamic brake
Forced stop deceleration deceleration
[Pr. PC24]
Initial
value
0h
0h
0h
0h
0h
0h
0h
0h
100