Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 336

7. PARAMETERS
No./ Setting
symbol/name digit
PB03 This is used to set the constant of a primary delay to the position command.
PST You can select a control method from "Primary delay" or "Linear
acceleration/deceleration" in [Pr. PB25 Function selection B-1]. The setting range of
Position
"Linear acceleration/deceleration" is 0 ms to 10 ms. Setting of longer than 10 ms will
command
be recognized as 10 ms.
acceleration/d
eceleration (Example) When a command is given from a synchronizing encoder, synchronous
time constant operation will start smoothly even if it starts during line operation.
(position
smoothing)
Setting range: 0 to 65535
PB04 Set the feed forward gain.
FFC When the setting is 100%, the droop pulses during operation at constant speed are
nearly zero. However, sudden acceleration/deceleration will increase the
Feed forward
overshoot. As a guideline, when the feed forward gain setting is 100%, set 1 s or more
gain
as the acceleration time constant up to the rated speed.
Setting range: 0 to 100
PB06 This is used to set the load to motor inertia ratio or load to motor mass ratio.
GD2 Setting a value considerably different from the actual load moment of inertia may
cause an unexpected operation such as an overshoot.
Load to motor
inertia The setting of the parameter will be the automatic setting or manual setting depending
ratio/load to on the [Pr. PA08] setting. Refer to the following table for details. When the parameter
motor mass is automatic setting, the value will vary between 0.00 and 100.00.
ratio
Setting range: 0.00 to 300.00
_ _ _ 0 (2 gain adjustment mode 1
(interpolation mode))
_ _ _ 1 (Auto tuning mode 1)
_ _ _ 2 (Auto tuning mode 2)
_ _ _ 3 (Manual mode)
_ _ _ 4 (2 gain adjustment mode 2)
Function
Synchronizing
encoder
Start
Servo amplifier
Without time
constant setting
Without time
Servo motor
constant setting
speed
ON
OFF
Start
Pr. PA08
7 - 31
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Servo motor
t
This parameter
Automatic setting
Manual setting
Control mode
Initial
value
[unit]
0
[ms]
0
[%]
7.00
[Multiplier]