Feedback Filter; Maximum Feedback Reference; Feedback Reference; Feedback Reference Scaling - Control Techniques unidrive sp Advanced User's Manual

Parameter Keypad and Parameter
structure display x.00
SSI
SSI encoders normally use gray code data format. However, some encoders use binary format which may be selected by setting this parameter to
one.
x.19

Feedback filter

Drive modes Closed-loop vector, Servo
Bit SP
Coding
Range Closed-loop vector, Servo
Default Closed-loop vector, Servo
Update rate Background read
0 = 0ms, 1 = 1ms, 2 = 2ms, 3 = 4ms, 4 = 8ms, 5 = 16ms
A sliding window filter may be applied to the feedback. This is particularly useful in applications where the feedback is used to give speed feedback
for the speed controller and where the load includes a high inertia, and so the speed controller gains are very high. Under these conditions, without a
filter on the feedback, it is possible for the speed loop output to change constantly from one current limit to the other and lock the integral term of the
speed controller.
x.20

Maximum feedback reference

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Open-loop, Closed-loop vector, Servo,
Default
Regen
Update rate Background read
x.21

Feedback reference

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate 4ms write
x.22

Feedback reference scaling

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Open-loop, Closed-loop vector, Servo,
Default
Regen
Update rate Background read
Unidrive SP Advanced User Guide
Issue Number: 7
Parameter Advanced parameter
description format descriptions
FI DE Txt VM DP ND
0 to 5 (0 to 16 ms)
0
FI DE Txt VM DP ND
1
0.0 to 40,000.0 rpm
1,500
FI DE Txt VM DP ND
1 1
±100.0 %
FI DE Txt VM DP ND
3
0.000 to 4.000
1.000
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Serial comms
Macros
protocol
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Electronic Feature look-
Performance
nameplate up table
PS
1
PS
1
PS
PS
1
Menus 15 to 17
SM-Uni Enc Pl
235