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Introduction
15
S-Curve Acceleration/Deceleration Profiling
The Gem6K allows you to perform
S-curve
move profiles, in addition to the usual trapezoidal profiles.
S-curve profiling provides smoother motion control by reducing the
jerk
(rate of change) in acceleration
and deceleration portions of the move profile (see drawing below). Because S-curve profiling reduces jerk,
it improves position tracking performance, especially in linear interpolation applications.
Decel
Accel
Time
Decel
V
elocity
Time
Trapezoidal
Accel
Time
V
elocity
Time
S-Curve
Maximum Jerk
Less Jerk
S-Curve Programming Requirements
To program an S-curve profile, you must use the
average accel/decel
commands provided in the Gem6K
programming language. For every maximum accel/decel command (e.g.,
A
,
AD
,
HOMA
,
HOMAD
,
JOGA
,
JOGAD
, etc.) there is an
average
command for S-curve profiling (see table below).
Maximum Accel/Decel Commands:
Command Function
Average (“S-Curve”) Accel/Decel Commands:
Command Function
A
Acceleration
AA
Average Acceleration
AD
Deceleration
ADA
Average Deceleration
HOMA
Home Acceleration
HOMAA
Average Home Acceleration
HOMAD
Home Deceleration
HOMADA
Average Home Deceleration
JOGA
Jog Acceleration
JOGAA
Average Jog Acceleration
JOGAD
Jog Deceleration
JOGADA
Average Jog Deceleration
JOYA
Joystick Acceleration
JOYAA
Average Joystick Acceleration
JOYAD
Joystick Deceleration
JOYADA
Average Joystick Deceleration
LHAD
Hard Limit Deceleration
LHADA
Average Hard Limit Deceleration
LSAD
Soft Limit Deceleration
LSADA
Average Soft Limit Deceleration
Determining the S-Curve Characteristics
The command values for average accel/decel (
AA
,
ADA
, etc.) and maximum accel/decel (
A
,
AD
, etc.) determine
the characteristics of the S-curve. To smooth the accel/decel ramps, you must enter average accel/decel
command values that satisfy the equation ½
A
≤
AA
<
A
, where
A
represents maximum accel/decel and
AA
represents average accel/decel. Given this requirement, the following conditions are possible:
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