Speed mode select, 3 speed mode select – Rockwell Automation WebPak 3000 DC Drive Application Workbook Version 1.1 User Manual
Page 19
Configuring the Speed Loop
3-9
The choices for
STOP
DECEL
SELECT
(P.122) are:
DECELERATION
TIME
(P.002) - The ramp stop deceleration time is
controlled by P.002, which was set during Quick Start.
RAMP
STOP
DECEL
TIME
(P.018) - The ramp stop deceleration time is
controlled by P.018. Note that the
S
-
CURVE
function is disabled if P.108 is
selected.
þ
If
STOP
DECEL
SELECT
(P.122) = P.018:
▲
Set
RAMP
STOP
DECEL
TIME
(P.018).
▲
Set
STOP
SPEED
THRESHOLD
(P.113) to specify the speed below which the main
contactor will open after a ramp stop or current limit stop is asserted.
REFERENCE
RATE
(P.866) is the rate of change of the speed loop reference (also scaled
as
GEAR
IN
SPEED
(P.011) per 1 second = 4095 counts). P.866 is used as one of the
inputs to the inertia compensation calculator function block.
A
LAG
block modifies the
S
-
CURVE
rate signal to provide filtering to the reference rate to
minimize noise that may be present on the reference signal.
▲
Set
REF
RATE
LAG
FREQ
(P.864).
ACCELERATION
TIME
(P.001), set during Quick Start, specifies the minimum time that
the selected speed reference can change from zero to
GEAR
IN
SPEED
(P.011).
If
NO
TRIM
or
INCREMENTAL
trim was selected in
TRIM
MODE
SELECT
(P.110), the drive
uses the value in
ACCELERATION
TIME
(P.001).
If
PROPORTIONAL
trim was selected in P.110, the drive uses the value in
ACCELERATION
TIME
(P.001) divided by the result of the following equation:
(1+ (
DRAW
PERCENTAGE
OUT
(P.196)) / 100
For example, if P.196 was set at 10, the acceleration time would be the value of P.001
divided by 1.1.
Note that if an external ramped reference is used, the acceleration rate for the internal
speed ramp (
S
-
CURVE
block) should be set so that it is faster than the acceleration rate
of the external speed reference ramp.
3.3
Speed Mode Select
Configuring the speed loop’s mode of operation involves:
•
Configuring jog
•
Selecting the outer loop
Range: P.002, P.018
P.122 =
Range: 0.1 to 300.0
SECONDS
P.018 =
SECONDS
Range: 0 to
MAXIMUM
SPEED
(
RPM
OR
USER
-
DEFINED
UNITS
)
P.113 =
Range: 0.01 to 139.62
RAD
/
S
P.864 =
RAD
/
S