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5. PARAMETERS
No.
Symbol
Name and function
Initial
value
Unit
Setting
range
Control mode
Position Speed Torque
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.
You can use parameter No.PB25 to choose the primary delay
or linear acceleration/deceleration control system. When you
choose linear acceleration/deceleration, the setting range is 0
to 10ms. Setting of longer than 10ms is recognized as 10ms.
0
ms
0
to
20000
POINT
When you have chosen linear
acceleration/deceleration, do not select
control selection (parameter No.PA01)
and restart after instantaneous power
failure (parameter No.PC22). Doing so
will cause the servo motor to make a
sudden stop at the time of position
control switching or restart.
(Example) When a command is given from a synchronizing
detector, synchronous operation can be started
smoothly if started during line operation.
Synchronizing
detector
Start
Servo amplifier
Servo motor
Without time
constant setting
Servo motor
speed
Start
With time
constant setting
ON
OFF
t
PB04
FFC
Feed forward gain
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 longer as the
acceleration time constant up to the rated speed.
0
0
to
100
Driver
