Parameter
structure
Keypad and
display
Parameter
x.00
Parameter
description format
Advanced parameter
descriptions
Macros
Serial comms
protocol
Electronic
nameplate
Performance RFC mode
Menus 15 to 17
SM-Resolver
Unidrive SP Advanced User Guide
277
Issue Number: 10 www.controltechniques.com
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. The filter is not active if the parameter value is 0 or 1ms, but operates over the defined window for parameter values of 2, 4, 8 and
16ms.
Pr x.24 = Pr x.05
Encoder simulation output is derived from the resolver input via hardware. The resolution multiplier can be set up using Pr
x.25
as shown in the table
below. The marker output is active when the resolver position is zero, therefore the marker pulse width is equivalent to one encoder count if the ratio
is 1, but is reduced if the ratio is less than 1.
Some ratios are not possible when the resolver resolution is reduced below 14 bits as shown in the table below.
Pr x.24 = Pr 3.29
Encoder simulation output is derived from the drive encoder port via hardware from the A, B and Z inputs. The drive encoder signals must be digital
and not SINCOS. No ratio is possible, therefore Pr
x.25
has no effect.
If Pr
x.24
has any value than those above the encoder simulation outputs are not active.
x.19
Feedback filter
RW
Uni
US
Ú
0 to 5 (0 to 16 ms)
Ö
0
Update rate: Background read
Value in Pr x.19
Filter window
0
Not active
1
Not active
2
2ms
3
4ms
4
8ms
5
16ms
x.24
Encoder simulation source
RW
Uni
PT
US
Ú
Pr
0.00
to Pr
21.51
Ö
Pr
0.00
Update rate: Background read
x.25
Encoder simulation ratio numerator
RW
Uni
US
Ú
0.0000 to 3.0000
Ö
1.0000
Update rate: Background read
Pr x.25
Resolver resolution
14 bit
12 bit
10 bit
0.0000 to 0.0312
1/32
1/8
1/2
0.0313 to 0.0625
1/16
1/8
1/2
0.0626 to 0.1250
1/8
1/8
1/2
0.1251 to 0.2500
1/4
1/4
1/2
0.2501 to 0.5000
1/2
1/2
1/2
0.5001 to 3.0000
1
1
1
x.29
Non-marker reset revolution counter
RO
Uni
NC
PT
Ú
0 to 65,535 revolutions
Ö
Update rate: 4ms x number of dumb modules
NOTE
Summary of Contents for unidrive sp
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