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EZMotion
Diagnostics Glossary Index
EZMotion User/Programming Guide 59
Revision A8 www.controltechniques.com
Encoder Configuration - Encoder Type
This parameter is available only when using a SM-Universal Encoder Plus module. The Encoder Type list box provides direct
access to parameter x.15 from the SM-Universal Encoder Plus module configuration menu. This parameter allows one SM-
Universal Encoder Plus module to support many different encoder types. Select the desired type of encoder from this list box.
See the SM-Universal Encoder Plus section of the SM-EZMotion User Guide or the SM-Universal Encoder Plus User Guide
for more information.
Sin Cos Hiperface (Stegmann comms)
Encoder Setup Parameters
Encoder Supply Voltage
Because of the wide variety of encoders supported by the Unidrive SP/Digitax ST with the SM-Universal Encoder Plus
module, the user must have the ability to define the voltage supplied to the encoder hardware. The available voltage levels are
5 V, 8 V, and 15 V and are selectable from the list box on the Encoder view.
NOTE
Be sure not to configure a supply voltage greater than that supported by the encoder. The Unidrive SP/Digitax ST and SM-
Universal Encoder Plus cannot protect against possible damage to the encoder if the supply voltage is set too high.
Enable Auto Encoder Configuration Check box
When a SC.Hiper, SC.EnDat, or EnDat encoder is being used, the Unidrive SP/Digitax ST and/or SM-Universal Encoder Plus
module can interrogate the encoder on power-up, and acquire many of the encoder setup parameters automatically. To enable
this feature, select the Enable Auto Encoder Configuration check box. When the check box is selected (enabled) the Encoder
Turns, Encoder Comms Resolution, and Equivalent Lines Per Revolution parameters will appear dimmed implying that the
user no longer needs to configure those parameters. If the check box is cleared, then the user must specify the correct values
for these three parameters (Encoder Turns, Encoder Comms Resolution, and Equivalent Lines Per Revolution).
The aforementioned encoder parameter values are stored in non-volatile memory (NVM) embedded in the encoder. The
values stored in NVM cannot be changed by the user.
Encoder Turns
This parameter determines the maximum number of revolutions before the Rev Counter register (3.28 or x.04) rolls over. If
using an absolute encoder, this parameter should be set to the maximum number of turns or lower. The maximum number of
turns is defined as follows:
Maximum # of Turns = 2
N
, where N is the Encoder Turns parameter
The Encoder Turns box will appear dimmed when the Enable Auto Encoder Configuration check box is selected because the
information will be read from the encoder.
Encoder Comms Resolution
Encoder communications is used to initially read the absolute encoder position (SC.Hiper or SC.EnDat), the comms resolution
must be set to the maximum resolution of the absolute position data.
If the Enable Auto Encoder Configuration check box is selected, then the user does not need to enter this parameter, and the
Encoder Comms Resolution box will appear dimmed.
Equivalent Lines Per Revolution
When sin/cos signals are used, the equivalent number of encoder lines per revolution must be set up correctly to give the
correct speed and position feedback. The Equivalent Lines Per Revolution (ELPR) is defined as follows:
For SC.Hiper, SC.EnDat and SC.SSI encoders, the sine wave signal frequency can be up to 166 kHz, but the resolution is
reduced at higher frequencies. The table below shows the number of bits of interpolated information at different frequencies
and with different voltage levels at the drive encoder port. The total resolution in bits per revolution is the ELPR plus the
number of bits of interpolated information.
If the Enable Auto Encoder Configuration check box is selected, then the user does not need to enter this parameter, and the
Equivalent Lines Per Rev box will appear dimmed.
Position Feedback Device ELPR
Ab Number of lines per revolution
Fd, Fr Number of lines per revolution / 2
SC.Hiper, SC.EnDat, SC.SSI Number of sine waves per revolution
Volt / Freq 1,000 5,000 50,000 100,000 150,000
1.2 1111111010
1.0 11 11 10 10 9
0.8 10101010 9
0.6 101010 9 9
0.4 99998
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