Parameter
structure
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display
Parameter
x.00
Parameter
description format
Advanced parameter
descriptions
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protocol
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nameplate
Performance RFC mode
Menu 3
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Unidrive SP Advanced User Guide
77
Issue Number: 10 www.controltechniques.com
In closed-loop vector mode, if Pr
3.24
is set to 1 or 3 so that the drive is operating without position feedback, this parameter also defines a filter on the
output of the speed estimator which is used as the speed feedback. A filter with a 4ms time constant is always present on the output of the speed
estimator, but this filter may be extended as follows: 0 = 4ms, 1 = 8ms, 2 = 16ms, 3 = 32ms, 4 = 64ms, 5 = 128ms. The output of the speed estimator
can include some ripple, which increases as the drive passes into field weakening and the filter can be used to remove this ripple. This is particularly
useful when using standard ramp or spinning start with a low friction high inertia load, and can prevent over voltage trips when the drive has no
braking resistor.
The drive encoder input can be used as a reference to control a drive parameter. The drive encoder reference parameter (Pr
3.45
) gives the speed of
the encoder input as a percentage of the maximum drive encoder reference provided that the number of encoder lines per revolution (Pr
3.34
) has
been set up correctly. This may then be scaled and routed to any non-protected drive parameter.
3.43
Maximum drive encoder reference
Drive modes
Open-loop, Closed-loop vector, Servo
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
Range
Open-loop, Closed-loop vector, Servo
0 to 40,000 rpm
Default
Open-loop, Closed-loop vector
Servo
1,500
3,000
Update rate
Background read
3.44
Drive encoder reference scaling
Drive modes
Open-loop, Closed-loop vector, Servo
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
3
1
1
1
Range
Open-loop, Closed-loop vector, Servo
0.000 to 4.000
Default
Open-loop, Closed-loop vector, Servo
1.000
Update rate
Background read
3.45
Drive encoder reference
Drive modes
Open-loop, Closed-loop vector, Servo
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Range
Open-loop, Closed-loop vector, Servo
±100.0%
Update rate
4ms write
3.46
Drive encoder reference destination
Drive modes
Open-loop, Closed-loop vector, Servo
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
2
1
1
1
1
Range
Open-loop, Closed-loop vector, Servo
Pr
0.00
to Pr
21.50
Default
Open-loop, Closed-loop vector, Servo
Pr
0.00
Update rate
Read on reset
3.47
Re-initialise position feedback
Drive modes
Open-loop, Closed-loop vector, Servo
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
Update rate
Background read
3.48
Position feedback initialised
Drive modes
Open-loop, Closed-loop vector, Servo
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Update rate
Background write
Содержание unidrive sp
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