Parameter
structure
Keypad and
display
Parameter
x.00
Parameter
description format
Advanced parameter
descriptions
Macros
Serial comms
protocol
Electronic
nameplate
Performance
Feature look-
up table
Menus 15 to 17
SM-Encoder Pl
Unidrive SP Advanced User Guide 259
Issue Number: 7 www.controltechniques.com
These parameters effectively give the position with a resolution of 1/2
16
ths of a revolution as a 32 bit number as shown below.
Provided the set-up parameters are correct, the position is always converted to units of 1/2
16
ths of a revolution, but some parts of the value may not
be relevant depending on the resolution of the feedback device. For example if 1,024 line digital encoder produces 4,096 counts per revolution, and
so the position is represented by the bits in the shaded area only.
When the feedback device rotates by more than one revolution, the revolutions in Pr x.04 increment or decrement in the form of a sixteen bit roll-over
counter.
An incremental digital encoder may have a marker channel and when this channel becomes active (rising edge in the forward direction and falling
edge in reverse) it may be used to reset the encoder position and set the marker flag (Pr x.07 = 0), or just to set the marker flag (Pr x.07 = 1). When
the position is reset by the marker, Pr x.05 is reset to zero. The marker flag is set each time the marker input becomes active, but it is not reset by the
drive, and so this must be done by the user.
x.04 Revolution counter
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
11111
Range
Open-loop, Closed-loop vector, Servo,
Regen
0 to 65,535 revolutions
Update rate Combined update time. This module adds 4ms to the combined update time.
x.05 Position
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
11111
Range
Open-loop, Closed-loop vector, Servo,
Regen
0 to 65,535 (1/2
16
ths of a revolution)
Update rate Combined update time. This module adds 4ms to the combined update time.
31 16 15 0
Revolutions Position
31 16 15 0 4 3
Revolutions
Position
x.07 Marker position reset disable
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
Default
Open-loop. Closed-loop vector, Servo,
Regen
0
Update rate Background read
x.08 Marker flag
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
Default
Open-loop. Closed-loop vector, Servo,
Regen
0
Update rate Combined update time. This module adds 4ms to the combined update time.
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