Magnetek HPV 900 Series 2, Техническое руководство

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S-Curves A2 Submenu
61
S-Curves A2 Submenu
Detailed descriptions
The HPV 900 Series 2 speed command is
passed through an internal S-curve in order to
produce the speed reference. In general, the
S-curve function takes an arbitrary speed
command and generates a speed reference
subject to the conditions that the maximum
accel, decel and jerk rates not be exceeded.
The speed command is typically the target
speed that the reference is headed to.
Note: If the car controller is feeding the drive a
speed profile including s-curves, the s-curve
settings on the drive need to be placed out of
the way. In those cases, set ACCEL RATE 0
and DECEL RATE 0 to the maximum (7.99
ft/s
2
or 3.999 m/ s
2
) and set ACCEL JERK IN 0,
ACCEL JERK OUT 0, DECEL JERK IN 0, and
DECEL JERK OUT 0 to the minimum (0.0 ft/ s
2
or 0.00 m/s 2 ).
Below shows the six parameters associated
with an S-Curve data set:

Accel- Maximum allowed acceleration rate
(ft/s 2 or m/s 2 )

Decel - Maximum allowed deceleration rate
(ft/s
2
or m/s
2
)

Accel Jerk In - Maximum allowed change in
acceleration towards Accel (ft/s 3 or m/s 3 )

Accel Jerk Out - Maximum allowed change
in acceleration from Accel (ft/s
3
or m/s
3
)

Decel Jerk In - Maximum allowed change in
deceleration towards Decel (ft/s 3 or m/s 3 )

Decel Jerk Out - Maximum allowed change
in deceleration from Decel (ft/s
3
or m/s
3
)
The S-curves are specified by four parameters:
acceleration rate (ft/s
2
or m/s
2
), deceleration
rate (ft/s
2
or m/s
2
), leveling jerk rate (ft/s
3
or
m/s
3
), and jerk rate (ft/s
3
or m/s
3
).
Since an adjustable jerk rate is helpful for
smooth landings, the jerk rates are split for
ease in elevator fine-tuning. The jerk rate
parameters specify: acceleration from the floor
(ACCEL JERK IN), jerk out of acceleration
(ACCEL JERK OUT), jerk into deceleration
(DECEL JERK IN), and the leveling into the
floor (DECEL JERK OUT).
S-Curve
There are four S-curve patterns available in
the drive and each S-curve is customized by
six parameters:
Parameters for S-curve-0 (SC0):

ACCEL RATE 0, DECEL RATE 0, ACCEL
JERK IN 0, ACCEL JERK OUT 0, DECEL
JERK IN 0, and DECEL JERK OUT 0
Parameters for S-curve-1 (SC1):

ACCEL RATE 1, DECEL RATE 1, ACCEL
JERK IN 1, ACCEL JERK OUT 1, DECEL
JERK IN 1, and DECEL JERK OUT 1
Parameters for S-curve-2 (SC2):

ACCEL RATE 2, DECEL RATE 2, ACCEL
JERK IN 2, ACCEL JERK OUT 2, DECEL
JERK IN 2, DECEL JERK OUT 2
Parameters for S-curve-3 (SC3):

ACCEL RATE 3, DECEL RATE 3, ACCEL
JERK IN 3, ACCEL JERK OUT 3, DECEL
JERK IN 3, DECEL JERK OUT 3
S-curve 4 (SC4) is for NTSD operation only
S-Curve Pattern Selection
The default S-curve pattern is S-curve-0
(SC0). To make the other patterns available,
the user must assign S-CURVE SEL 0 and/or
S-CURVE SEL 1 as logic input(s). The logic
input(s) can then be used to select one of the
S-curve patterns, as follows:
Logic Inputs
Assigned
S-curves
Available
None SC0 only
SEL 0 only SC0 or SC1
SEL 1 only SC0 or SC2
SEL 0 & SEL 1 SC0, SC1,
SC2 or SC3
S-curve Availability
logic input
S-CURVE S-curve
SEL 1 SEL 0 selected
0 0 SCO
0 1 SC1
1 0 SC2
1 1 SC3
Selecting S-curves
The jerk rates can be turned off by setting the
jerk rates to zero.
The accel / decel rates can also be turned off
by setting them to zero. But, setting the accel /
decel rates to zero is not recommended.