Command Descriptions
265
to the current setting of both the motor and load viscous damping terms (
DMTD
and
LDAMP
, respectively) as
shown in the equation below.
(
)
command
velocity
LDAMP
DMTD
torque
velocity
Estimated
100%
value
SGVF
⋅
+
=
=
4
4
4
3
4
4
4
2
1
Setting
SGVF
to 100% will theoretically produce zero following error during the constant velocity portion
of a move profile. This assumes that the drive or motor are not being current limited, the values for viscous
damping are accurate and the models used for analysis are correct. You can adjust the value of
SGVF
from
zero to as high as 5 times or 500% (
SGVF500
) of the theoretical value.
Working with servo gains
.
•
Servo tuning process: refer to the
Hardware Installation Guide
or to the Motion Planner help
system.
•
Check the values of all active gains (
SGVF
is one of many servo gains): use
TGAIN
.
•
Creating and invoking gain sets: see
SGSET
,
SGENB
,
TGAIN
,
TSGSET
.
Example:
SGVF200
; Set velocity feedforward to 200% of theoretical value
SGVRAT
Velocity Damping Ratio
Type
Tuning
Syntax
<a_><!>SGVRAT<r>
Units
r = ratio
Range
0.500 to 2.000 : ±0.001
Default
1.000
Response
SGVRAT:
*SGVRAT.224
See Also
LDAMP, LJRAT, SGIRAT, SGPSIG, SGPRAT, SGSET, TGAIN, TSGSET
Product Rev
GT6K n/a
GV6K 6.0
(applicable only to
servo axes)
The
SGVRAT
command sets the damping ratio (Zeta) of the velocity loop. Higher values produce a more
stable velocity loop. Lower values provide faster velocity response but increase velocity overshoot.
Working with servo gains
.
•
Servo tuning process: refer to the
Hardware Installation Guide
or to the Motion Planner help
system.
•
Check the values of all active gains (
SGVRAT
is one of many servo gains): use
TGAIN
.
•
Creating and invoking gain sets: see
SGSET
,
SGENB
,
TGAIN
,
TSGSET
.
SHALL
Hall Sensor Inversion
Type
Drive
Configuration
Syntax
<a_><!>SHALL<i>
(does not take effect until RESET, DRESET or
cycle power)
Units
i = control option #
Range
0 (do not invert)
1 (invert)
Default
0
Response
SHALL: *SHALL0
See Also
THALL
Product Rev
GT6K n/a
GV6K 6.0
(applicable only to
servo axes)
NOTE
: This command does not take effect until you cycle power to the drive, or issue a
RESET
or
DRESET
command.
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