Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 120

4. PARAMETERS
No. Symbol
PB03 PST Position command acceleration/deceleration time constant
(Position smoothing)
Used to set the time constant of a low-pass filter in response to the
position command.
When the one-touch tuning is executed, this parameter is automatically
set. (Refer to section 6.1.)
The control system of either the primary delay or the linear
acceleration/deceleration can be selected by parameter No. PB25.
When the linear acceleration/deceleration is selected, the setting
range is 0 to 10ms. Setting of longer than 10ms is recognized as
10ms.
POINT
When the linear acceleration/deceleration is
selected, do not execute control switching. Doing
so will cause the servo motor to make a sudden
stop during the control switching.
(Example) When a command is given from a synchronous encoder,
synchronous operation can be started smoothly if started
during line operation.
Without time
constant setting
PB04 FFC Feed forward gain [Applied]
Set the feed forward gain. When the setting is 100%, the droop pulses
during operation at constant speed are nearly zero. However, sudden
acceleration/deceleration will increase the overshoot. As a guideline,
when the feed forward gain setting is 100%, set 1s or more as the
acceleration time constant up to the rated speed.
PB05 For manufacturer setting
Do not change this value by any means.
Name and function
Synchronous
encoder
Start
Servo amplifier
With time
constant setting
Servo motor
speed
ON
Start
OFF
Initial
value
Servo motor
4 - 23
Setting
Unit
range
Position
3 0 ms
to
20000
0 0 %
to
100
500
Control mode
Internal Internal
speed torque