Control Techniques unidrive sp User Manual

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94 Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 7
The uncoiler can operate at any positive speed applying tension. If it is necessary to accelerate the uncoiler a positive resultant torque demand is
used. The speed will be limited to the final speed demand. The operating area is the same as that for the coiler and is shown below:
4: Speed control with torque feed-forward
The drive operates under speed control, but a torque value may be added to the output of the speed controller. This can be used to improve the
regulation of systems where the speed loop gains need to be low for stability.
A first order filter, with a time constant defined by this parameter, is provided on the current demand to reduce acoustic noise and vibration produced
as a result of position feedback quantisation noise. The filter introduces a lag in the speed loop, and so the speed loop gains may need to be reduced
to maintain stability as the filter time constant is increased. Alternative time constants can be selected depending on the value of the speed controller
gain selector (Pr 3.16). If Pr 3.16 = 0 Pr 4.12 is used, if Pr 3.16 = 1 Pr 4.23 is used.
4.12 Current demand filter 1
Drive modes Closed-loop vector, Servo
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range Closed-loop vector, Servo 0.0 to 25.0 ms
Default Closed-loop vector, Servo 0.0
Update rate Background read
4.13 Current controller Kp gain
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range
Open-loop, Closed-loop vector, Servo,
Regen
0 to 30,000
Default
Drive voltage rating:
Open-loop,
Closed-loop vector, Servo
Regen
200V 400V 575V 690V
20 20 20 20
75 150 180 215
45 90 110 130
Closed-loop vector, Servo Pr 21.22
Update rate Background read
-5rpm
Area for normal uncoiler
operation: negative torque,
limited to low speed in reverse
Speed reference
Area for accelerating
uncoiler: positive torque,
limited speed
Speed
Tor qu e
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Control Techniques unidrive sp Specifications

General

Brand	Control Techniques
Model	unidrive sp
Category	Controller
Language	English