
B-65270EN/05 4.SERVO FUNCTION DETAILS
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4.4.3 Variable Proportional Gain Function in the Stop State
(1) Overview
The velocity gain or load inertia ratio is generally increased if a large
load inertia is applied to a motor, or to improve the response. An
excessively large velocity gain may cause the motor to generate a
high-frequency vibration when it stops. This vibration is caused by
excessive proportional gain of the velocity loop (PK2V) when the
motor is released within the backlash of the machine in the stop state.
This function decreases the velocity loop proportional gain (PK2V) in
the stop state only. The function can suppress the vibration in the stop
state and also enables the setting of a high velocity gain.
(2) Series and editions of applicable servo software
(Series 30i,31i,32i)
Series 90D0/A(01) and subsequent edition
Series 90E0/A(01) and subsequent edition
(Series 15i-B,16i-B,18i-B,21i-B,0i-B,0i Mate-B, Power Mate i)
Series 9096/A(01) and subsequent edition
Series 90B0/A(01) and subsequent edition
Series 90B1/A(01) and subsequent edition
Series 90B6/A(01) and subsequent edition
(Series 0i-C,0i Mate-C,20i-B)
Series 90B5/A(01) and subsequent edition
(3) Setting parameters
#7 #6 #5 #4 #3 #2 #1 #0
1958 (FS15i)
PK2VDN
2016 (FS30i, 16i)
PK2VDN (#3) 1: The variable proportional gain function in the stop state is used.
1730 (FS15i)
Variable proportional gain function in the stop state : Stop judgment level
2119 (FS30i, 16i)
[Unit of data] Detection unit
[Recommended value] 2 to 10 (Detection unit: 1 µm)
20 to 100 (Detection unit: 0.1 µm)
With Series 90B0, 90B6, or 90B5, a function for decreasing a set
proportional gain in the stop state to 50% as well as 75%, and a
function for setting an arbitrary magnification only in cutting feed are
available. When decreasing the velocity loop proportional gain in the
stop state to 50%, set the following bit parameter in addition to the
function bit for the function for changing the proportional gain in the
stop state and the parameter for stop determination level.