P.217), P.215), P.298) – Rockwell Automation FlexPak 3000 Digital DC Drive Version 4.3 User Manual
Page 61
Configuring the Speed/Voltage Loop
5-13
5.4
Configuring the Speed Loop Forward Path Lag Block
Lag adjustments compensate for noisy feedback or reference signals. The speed loop
lag block serves as a low pass frequency compensation filter. A positive or negative
step input to the lag block drives the output to increase or decrease its value in the
direction of the input. A lower lag break frequency will exhibit a slower step response
than a higher one.
The lag transfer function is:
, where
ω
lag
=
SPD
LOOP
LAG
FREQ
(P.215).
1
1
s
ω
lag
----------
+
--------------------
SPD
LOOP
LAG
BYPASS
(P.217)
Determines if the
speed loop forward
path lag block will act
upon the speed loop
error signal.
Parameter Range:
ON
OFF
Default Setting:
ON
Parameter Type:
Tunable
OIM Menu Path(s):
Speed/Voltage Loop (
SPD
) - Speed/Voltage Loop
(
SPD
) Tuning
If
ON
, the lag block is bypassed and does not affect the speed loop forward path
signal.
SPD
LOOP
LAG
FREQ
(P.215)
Specifies the lag
break frequency for
the speed loop
forward path lag
block.
If
SPD
LOOP
LAG
BYPASS
is
ON
, this
parameter has no
effect.
Parameter Range:
0.01 to 139.62
RAD
/
S
when
•
FEEDBACK
SELECT
(P.200) =
ARMATURE
VOLT
•
SPD
LOOP
SCAN
TIME
(P.019) = 10
MS
0.01 to 279.25
RAD
/
S
when
•
FEEDBACK
SELECT
(P.200)
≠
ARMATURE
VOLT
•
SPD
LOOP
SCAN
TIME
(P.019) = 5
MS
Default Setting:
1.00
RAD
/
S
Parameter Type:
Tunable
OIM Menu Path(s):
Speed/Voltage Loop (
SPD
) - Speed/Voltage Loop
(
SPD
) Tuning
SPD
LOOP
LAG
OUTPUT
(P.298)
The value
immediately after the
speed loop forward
path lag block.
Parameter Range:
n/a
Default Setting:
n/a
Parameter Type:
Output
OIM Menu Path(s):
SPD
- Speed/Voltage Loop (
SPD
) Test Points