Netzer DS-25 17 Bit Resolution Absolute Encoder User Manual

: June 3, 2024
: Netzer

Table of Contents

Netzer DS-25 17 Bit Resolution Absolute Encoder
Product Overview
Unpacking
Electrical interconnection
Software installation
Mounting verification
Calibration
Operational Mode
Mechanical Drawings
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Netzer DS-25 17 Bit Resolution Absolute Encoder

Preface

Version 2.0: November 2021

Applicable documents

DS-25 electric encoder datasheet

ESD protection
As usual for electronic circuits, during product handling do not touch electronic circuits, wires, connectors or sensors without suitable ESD protection. The integrator/operator shall use ESD equipment to avoid the risk of circuit damage.

ATTENTION
OBSERVE PRECAUTIONS FOR HANDLING ELECTROSTATIC-SENSITIVE DEVICES

Product Overview

Overview
The DS-25 absolute position Electric Encoder™ is a revolutionary position sensor originally developed for harsh environment critical applications. Currently, it performs in a broad range of applications, including defense, homeland security, aerospace, and medical and industrial automation. The Electric Encoder™ non-contact technology relies on an interaction between the measured displacement and a space/time-modulated electric field. The DS-25 Electric Encoder™ is semi-modular, i.e., its rotor and stator are separate, with the stator securely housing the rotor.

Encoder stator
Encoder rotor
Encoder mounting clamps
Rotor fastener
Cable interface

Installation flow chart

Encoder mounting

The encoder rotor (2) attaches to the host shaft (d) by pressing it against a dedicated shoulder (a), a screw and a washer or circular spring and washer at the end of the shoulder to maintain pressure, recommended force of 0.3 Nm with M3 screw.

The encoder stator (1) is centered by circumferential step (b) and attached to the host stator (c) using three encoder clamps, recommended force of 0.3 Nm with the supplied encoder clamps.

Note:
DO NOT use screw-locking materials containing Cyanoacrylate which interact aggressively with the sensor body made of Ultem.

Encoder stator/Rotor relative position
The rotor is floating, therefore, for proper relative axial mounting distance “H” between the shaft shoulder (b) and stator mounting recess (a) should be 1.4 mm nominal.
For ease of mechanical mounting compensation by rotor shims, the recommended distance is 1.4 – 0.05 mm, yielding analog output. The optimal recommended amplitude values are middle of the range according to those shown in the Encoder Explorer software and vary according to the encoder type.

The DS-25 amplitudes compensation
Mechanical compensation by using 50 um shims below the rotor (available as DS-25-R-00 kit), will increase the amplitude level by ~ 50mV. Verify proper rotor mounting with the Encoder Explorer tools “Signal analyzer” or “Mechanical installation verification.”

Note: for more information please read paragraph 6

Unpacking

Standard order
The package of the standard DS-25 contains the encoder with 250mm shildedd cable AWG30 and EAPK004 kit encoder mounting clamps, (3 clamps, 0-80 UNF HEX Socket screw L 3/16”, S.S )

Optional accessories:

DS-25-R-00, Rotor shims kit (x10 stainless steel shims, 50um each)
MA-DS25-004, Shaft end installation kit (M3x5 screw + washer)
CNV-00003, RS-422 to USB converter (Setup Mode)
NanoMIC-KIT-01, RS-422 to USB converter. Setup & Operational modes via SSi /BiSS interface.
DKIT-DS-25-SF-S0, Mounted SSi encoder on rotary jig, RS-422 to USB converter and cables.
DKIT-DS-25-IF-S0, Mounted BiSS encoder on rotary jig, RS-422 to USB converter and cables.

Electrical interconnection

This chapter reviews the steps required to electrically connect the encoder with digital interface (SSi or BiSS-C).

Connecting the encoder
The encoder has two operational modes:

Absolute position over SSi or BiSS-C:
This is the power-up default mode

SSi / BiSS interface wires color code

Clock +| Grey|

Clock

---|---|---
Clock –| Blue
Data –| Yellow|

Data

Setup mode over NCP (Netzer Communication Protocol)
This service mode provides access via USB to a PC running Netzer Encoder Explorer application (on MS Windows 7/10). Communication is via Netzer Communication Protocol (NCP) over RS-422 using the same set of wires. Use the following pin assignment to connect the encoder to a 9-pin D-type connector to the RS-422/USB converter CNV-0003 or the NanoMIC.

Electric encoder interface, D Type 9 pin Female

Description	Color	Function	Pin No

SSi Clock / NCP RX

SSi Data / NCP TX

Electrical connection and grounding
The encoder does NOT come with a specified cable and connector, however, do observe grounding considerations:

The cable shield does not connect to the power supply return line.
Ground the host shaft to avoid interference from the host system, which could result in encoder internal noise.

Note: 4.75 to 5.25 VDC power supply required Netzer-DS-25-17-Bit-
Resolution-Absolute-Encoder-fig-6

Software installation

The Electric Encoder Explorer (EEE) software:

Verifies Mechanical Mounting Correctness
Offsets Calibration
Sets up general and signal analysis

This chapter reviews the steps associated with installing the EEE software application.

Minimum requirements

Operating system: MS windows 7/ 10,(32 / 64 bit)
Memory: 4MB minimum
Communication ports: USB 2
Windows .NET Framework, V4 minimum

Installing the software

Run the Electric Encoder™ Explorer file found on the Netzer website: Encoder Explorer Software Tools
After the installation, you will see the Electric Encoder Explorer software icon on the computer desktop.
Click on the Electric Encoder Explorer software icon to start.

Mounting verification

Starting the Encoder Explorer
Make sure to complete the following tasks successfully:

Mechanical Mounting
Electrical Connection
Connecting Encoder for Calibration
Encoder Explore Software Installation

Run the Electric Encoder Explorer tool (EEE)
Ensure proper communication with the encoder: (Setup mode by default).

The status bar indicates successful communication.
Encoder data displays in the encoder data area. (CAT No., Serial No.)
The position dial display responds to shaft rotation.
Perform mounting verification & rotation direction selection before calibration to ensure optimal performance. It is also reccomended to observe the instaletion at the [Tools – Signal Analizer] window.

Mechanical installation verification
The Mechanical Installation Verification provides a procedure that will ensure proper mechanical mounting by collecting raw data of the fine and coarse channels during rotation.

Select [Mechanical Mounting Verification] on the main screen.
Select [Start] to initiate the data collection.
Rotate the shaft in order to collect the fine and coarse channels data.
At the end of a successful verification, the SW will show “Correct Mechanical Installation.”
If the SW indicates “Incorrect Mechanical Installation,” correct the mechanical position of the rotor, as presented in paragraph 3.3 – “Rotor Relative Position.”

Calibration

New feature
Auto-Calibration option enabled. Refer to document: Auto-calibration-feature- user-manual-V01

Offset calibration
For optimal performance of the Electric Encoders, the inevitable DC offset of the sine and cosine signals must be compensated over the operational sector.
After successfully completing the Mounting Verification procedure:

Select [Calibration] on the main screen.
Start the data acquisition while rotating the shaft. The progress bar (c) indicates the collection progress. Rotate the axis consistently during data collection-covering the working sector of the application end to end-by default the procedure collects 500 points over 75 seconds. Rotation speed is not a parameter during data collection. Data collection indication shows for the fine/coarse channels, a clear “thin” circle appears in the center (d) (e) with some offset.

Offset compensated fine / Corse channel Netzer-DS-25-17-Bit-Resolution-
Absolute-Encoder-fig-14

CAA calibration
The following calibration aligns the coarse/fine channel by collecting data from each point of both channels. Select [Continue to CAA Calibration] In the CAA angle calibration window, select the relevant option button from the measurement range options (a):

Full mechanical rotation – shaft movement is over 10deg – recommended.
Limited section – define the operation of the shaft in a limited angle defined by degrees in case of <10deg
Free sampling modes – define the number of calibration points in the total number of points in the text box. The system displays the recommended number of points by default. Collect a minimum of nine points over the working sector.
Click the [Start Calibration] button (b)
The status (c) indicates the next required operation; the shaft movement status; the current position, and the next target position to which the encoder should be rotated.
Rotate the shaft/encoder to the next position and click the [Continue] button (c)
- the shaft should be in STAND STILL during the data collection. Follow the indication/interactions during the cyclic process for positioning the shaft –> stand still –> reading calculation.
Repeat the above step for all defined points. Finish (d)
Click the [Save and Continue] button (e).

The last step saves the offsets CAA parameters, completing the calibration process.

Setting the encoder zero point
The zero position can be defined anywhere in the working sector. Rotate the shaft to the desired zero mechanical position. Go into the “Calibration” button at the top menu bar, and press “Set UZP”. Select “Set Current Position” as zero by using the relevant option, and click [Finish]. Netzer-DS-25-17
-Bit-Resolution-Absolute-Encoder-fig-16

Jitter test
Perform a jitter test to evaluate the quality of the installation; the jitter test presents the reading statistics of absolute position readings (counts) over time. Common jitter should be up +/- 3 counts; higher jitter may indicate system noise.

In case the reading data (blue dots) are not evenly distributed on a thin circle, you may experience “noise” in your installation (check shaft/stator grounding). Netzer-DS-25-17-Bit-Resolution-Absolute-Encoder-
fig-18

Operational Mode

SSi/BiSS
Operational mode indication of the SSi / BiSS Encoder interface available by using the NanoMIC. For more information read about NanoMIC on Netzer website The operational mode presents the “real” SSi / BiSS interface with 1MHz clock rate.

Protocol SSi

Protocol BiSS