Netzer DS-25 Everight Position User Guide

Contents hide

1 DS-25 Everight Position

2 Documents / Resources

2.1 References

3 Related Posts

DS-25 Everight Position

View Fullscreen

DS-25
PRODUCT GUIDE

Absolute

Hollow Shaft

Rotary Encoder Three-plate

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

Table of Contents
1. DS Encoders Introduction ……………………………………………………………………………………………………………………………….4
2. Technical Specifications …………………………………………………………………………………………………………………………………..5
3. Ordering Code…………………………………………………………………………………………………………………………………………………..6
4. Mechanical Drawings……………………………………………………………………………………………………………………………………….7
5. Mechanical Interface Control Drawing…………………………………………………………………………………………………… 8-11
6. Storage and Handling…………………………………………………………………………………………………………………………………… 12
7. ESD Protection……………………………………………………………………………………………………………………………………………….. 12
8. Product Overview …………………………………………………………………………………………………………………………………….12-13 8.1 Overview…………………………………………………………………………………………………………………………………………………………………………….. 12 8.2 Unpacking – Standard order ………………………………………………………………………………………………………………………………………. 13 8.3 Installation flow chart ……………………………………………………………………………………………………………………………………………………. 13
9. Electric Encoder Software Installation……………………………………………………………………………………………………….. 14 9.1 Minimum requirements ……………………………………………………………………………………………………………………………………………….. 14 9.2 Installing the software …………………………………………………………………………………………………………………………………………………… 14
10. Mechanical Mounting………………………………………………………………………………………………………………………………14-15 10.1 Encoder mounting – End-of-Shaft Installation …………………………………………………………………………………………………….. 14
11. Electrical Connection……………………………………………………………………………………………………………………………….16-19 11.1 Absolute position over SSi or BiSS-C ……………………………………………………………………………………………………………………….. 16 11.2 Digital SSi Interface…………………………………………………………………………………………………………………………………………………………. 17 11.2 Digital BiSS-C Interface………………………………………………………………………………………………………………………………………………….. 18 11.2 Setup mode over NCP (Netzer Communication Protocol)……………………………………………………………………………… 19 11.2 Electrical connection and grounding……………………………………………………………………………………………………………………… 19
12. Signal Verification……………………………………………………………………………………………………………………………………..20-22 12.1 Starting the Encoder Explorer…………………………………………………………………………………………………………………………………….. 20 12.2 Signal verification process……………………………………………………………………………………………………………………………………………. 21
13. Calibration………………………………………………………………………………………………………………………………………………….23-31 13.1 Auto-calibration……………………………………………………………………………………………………………………………………………………………….. 23 13.2 Manual calibration ………………………………………………………………………………………………………………………………………………………….. 26 13.3 Setting the encoder zero-position……………………………………………………………………………………………………………………………. 30 13.4 Jitter test……………………………………………………………………………………………………………………………………………………………………………… 31
14. Operational Mode…………………………………………………………………………………………………………………………………………. 32 9.1 SSi / BiSS ……………………………………………………………………………………………………………………………………………………………………………… 32

1. DS Encoders Introduction
Designed to meet the requirements of the most demanding applications
The DS series of Electric EncodersTM are a line of encoders designed for harsh environment applications. These encoders are based on capacitive technology which have been developed and improved for over 20 years by Netzer Precision Position Sensors.
The DS encoders are characterized by the following features that sets them apart from other similar encoders:
Low profile Hollow shaft (Stator / Rotor) No bearings or other contact elements High resolution and excellent precision Immunity to magnetic fields High tolerance to shock, moisture, EMI, RFI Very low weight Holistic signal generation and sensing Digital interfaces for absolute position
The holistic structure of the DS Electric EncoderTM makes it unique. Its output reading is the averaged outcome of the entire circumference area of the sensor. This inherent design characteristic provides the DS encoder with outstanding precision and accuracy. The absence of components such as ball bearings, flexible couplers, glass discs, light sources & detectors, along with very low power consumption, enables the DS encoders to deliver virtually failure-free performance.

4 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

2. Technical Specifications

General

Angular resolution

17-19 bit

Nominal position accuracy

±0.020°

Nominal position extended accuracy (EA)

±0.010°

Maximum operational speed

4,000 rpm

Measurement range

Single turn absolute position

Built In Test BIT

Optional

Rotation direction

Adjustable CW/CCW

* Default same direction from bottom side of the encoder

Mechanical
Allowable mounting eccentricity Allowable axial mounting tolerance Rotor inertia Total weight Outer Ø /Inner Ø/ Height Material (stator / rotor)

±0.1 mm ±0.1 mm 11 gr · mm2 10 gr 25 / 6 / 7 mm UltemTM polymer / TRVX-50

Electrical
Supply voltage Current consumption Interconnection Communication Output code Serial output Clock frequency Position update rate

5V ± 5% ~90 mA #30 shielded cable SSi, BiSS-C Binary Differential RS-422 0.1 – 5.0 MHz 35 kHz (Optional – up to 375 kHz)

Environmental
EMC Operating temperature Storage temperature Relative humidity Shock endurance / functional Vibration functional Protection

IEC 6100-6-2, IEC 6100-6-4 -40°C to +85°C -50°C to +85°C 98% Non condensing 100 g for 11 ms / 40g 11ms (per MIL-STD-810G) 20 g 10 2000 Hz (per MIL-STD-810G) IP 40

Netzer Precision Position Sensors

DS-25-PG-V01 5

3. Ordering Code

DS – 25 – S F – S O – n n n

DS Product Line

Outer Diameter

Output

SSi

BiSS

Resolution

Code Bit

G 18

CPR 131,072 262,144 524,288

BIT (Built In Test): Optional

[ ] None

BIT

EA Extended Accuracy nnn Custom
Rotor options – Ø ID [ ] Default, 6 mm M Rotor metal sleeve, 4.5 mm
Interconnection 0 250 mm Flying leads (default) 1 500 mm Flying leads 2 750 mm Flying leads 3 1000 mm Flying leads C Connector (optional)
Cable Options S Jacket and shielded cable

6 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

4. Mechanical Drawings

(Oponal) (Oponal)

DS-25 with rotor metal sleeve

(Oponal)

30°

(Oponal)
3 grooves every 120°

SECTION A-A

Netzer Precision Position Sensors

Unless otherwise specified

Dimensions are in: mm Surface finish: N6

Linear tolerances

0.5-4.9: ±0.05 mm

5-30: ±0.1 mm

31-120: ±0.15 mm

121-400: ±0.2 mm

DS-25-PG-V01 7

5. Mechanical Interface Control Drawing
Shaft – End installation (step)

M3 6 0 7.30 -0.05 *
16

0.05 B 0.05

0.05 A

0.05

+0.07 25 +0.05 * B

A
0 6 -0.02 * 0.05 A 0.05
0.20 X 45°

23 max.

+0.05 1.40 0 *
+0.10 0.50 0 *

3 HOLES #0-80″ EQ.SP. 0.1 A
28

0.50 max.

0.50min 1

Unless otherwise specified

Dimensions are in: mm Surface finish: N6

Linear tolerances

0.5-4.9: ±0.05 mm

5-30: ±0.1 mm

31-120: ±0.15 mm

121-400: ±0.2 mm

8 DS-25-PG-V01

0.20 break corner

DETAIL B SCALE 4 : 1

Attention! Although the nominal dimension in the encoder is 1.5 mm, the recommended height difference between the stator and rotor mounting surfaces is 1.4 mm. This is because, in case of mounting assembly inaccuracies, a negative error could be easily corrected using shims, while a positive error could only be solved by machining the mounting assembly.

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

+0.07

25 +0.05 *

6 -0.02 *

0.05 A

0.05

0.20 X 45°

23 max.

0.50min 1

TAIL B ALE 4 : 1

No Part
1 DS-25 2 EAPK004 3
MA-DS25-004 4

Included Included
Optional

Kit 0-80″ Shaft end installation kit

Description
DS-25 encoder 3 x encoder clamps nylon Washer DIN125-A3.2 Screw DIN 7984 M3x5

QTY.
1 1 1 1

WARNING Do not use Loctite or other glues containing Cyanoacrylate. We recommend to use 3M glue – Scotch-WeldTM Epoxy Adhesive EC-2216 B/A.
Netzer Precision Position Sensors

DS-25-PG-V01 9

Deep, Shaft – End installation (step)

M3 6 0
7.30 -0.05 *
16

0.05 B 0.05
B
0.05 A 0.05

25.50 0.1 A
B

0 6 -0.02* 0.05 A 0.05
0.20 X 45°

23 max.

+0.07

25 +0.05*

+0.50 1 0

+0.05 1.40 0 *
+0.10 0.50 0

3 HOLES M2 EQ.SP. 0.1 A

0.50min 0
5.50 -0.10

0.50 max.

29.80

0.20 break corner

DETAIL B SCALE 4 : 1

WARNING Do not use Loctite or other glues containing Cyanoacrylate. We recommend to use 3M glue – Scotch-WeldTM Epoxy Adhesive EC-2216 B/A.
10 DS-25-PG-V01

Product Guide

A 0
6 -0.02* 0.05 A 0.05
0.20 X 45°

+0.50 1 0

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

4
1 3
2

0.50min 0
5.50 -0.10

L B 4 : 1

No Part
1 DS-25 2 EAPK005 3
MA-DS25-004 4

Included Optional
Optional

Kit Shaft end installation kit

Description
DS-25 encoder 3 x M2 encoder clamps Washer DIN125-A3.2 Screw DIN 7984 M3x5

QTY.
1 1 1 1

Cable information

Netzer Cat No. CB 00014

Cable type 30 AWG twisted pair x 3

Wire type

2 x 30 AWG 25/44 tinned copper Insulation: PFE Ø 0.15 OD: Ø 0.6 ± 0.05 mm

Temp. Rating -55°C to +150°C

Braided shield

Thinned copper braided 95% min. coverage

Jacket

0.45 silicon rubber (NFA 11-A1)

Diameter

Ø 2.45 ± 0.16 mm

30 AWG twisted pairs x3 Braid shield
Jacket 0.45 mm Ø 2.45 ±0.16 mm
Pair# Color A1-A2 Red / Black A3-A4 Gray / Blue A5-A6 Green / Yellow

Netzer Precision Position Sensors

A2 A1

DS-25-PG-V01 11

6. Storage and Handling
Storage temperature: -50°C to +85°C Humidity: Up to 98% non-condensing
7. 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

8. Product Overview
8.1 Overview
The DS-25 absolute position Electric EncoderTM is a rotary position sensor originally developed for harsh environment applications. Currently it performs in a broad range of applications, including defense, homeland security, medical robotics and industrial automation.
The Electric EncoderTM non-contact technology provides accurate position measurement through the modulation of an electric field.
The DS-25 Electric EncoderTM is semi-modular, i.e., its rotor and stator are separate, with the stator securely housing the rotor.

(1) Encoder stator (2) Encoder rotor (3) Encoder mounting clamps (4) Rotor fastner (5) Cable interface

12 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

8.2 Unpacking – Standard order
The package of the standard DS-25 contains the encoder with 250 mm shielded cable AWG30 and EAPK004 kit encoder mounting clamps, (3 clamps, 0-80 UNF HEX Socket screw L 3/16″, S.S ) Optional accessories: (1) DS-25-R-00, Rotor shims kit (x10 stainless steel shims, 50um each) (2) MA-DS25-004, Shaft end installation kit (M3x5 screw + washer) (3) CNV-00003, RS-422 to USB converter (For encoder setup via NCP interface) (4) NanoMIC-KIT-01, RS-422 to USB converter. Encoder setup & operational modes via SSi /BiSS interface (5) DKIT-DS-25-SF-S0, Mounted SSi encoder on rotary jig, RS-422 to USB converter and cables (6) DKIT-DS-25-IF-S0, Mounted BiSS encoder on rotary jig, RS-422 to USB converter and cables
8.3 Installation flow chart

Electric Encoder Software
installation on PC

Mechanical mounting

Electrical connection

Signal verification

YES

Calibration
Netzer Precision Position Sensors

Mounting correction

DS-25-PG-V01 13

9. Electric Encoder Software Installation
The Electric Encoder Explorer (EEE) software:
Verifies correct mounting for an adequate signal amplitude Calibration of offsets General set up and signal analysis This section describes the steps associated with installing the EEE software application.
9.1 Minimum requirements
Operating system: MS windows 7/ 10, (32 / 64 bit) Memory: 4MB minimum Communication ports: USB 2 Windows .NET Framework, V4 minimum
9.2 Installing the software
Run the Electric EncoderTM Explorer file found on Netzer website: Encoder Explorer Software Tools After the installation you will see Electric Encoder Explorer software icon on the computer desktop. Click on the Electric Encoder Explorer software icon to start.
10. Mechanical Mounting
10.1 Encoder mounting – End-of-Shaft Installation

The encoder rotor (2) is attached to the host shaft (d) by pressing it against a dedicated shoulder (a), while using screw and a washer, or a circular spring and a washer, at the top of the rotor shoulder to maintain downward pressure. Recommended force of 0.1 Nm with M3 screw.
The encoder stator (1) is centered by circumferential step (b) and is mounted to the host stator (c) by using three dedicated encoder clamps. Recommended force of 0.3 Nm with the supplied encoder clamps.
Note that Netzer strongly recommends using the clamps. If not using the dedicated clamps, avoid applying pressure to the entire top surface of the encoder’s housing, but only to the outer circumference perimeter of the cover.

14 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

Stator / rotor relative position
As the rotor is floating, a nominal axial mounting distance of 1.4 mm between the shaft shoulder (b) and stator mounting recess (a) is required. The mounting can be assisted by rotor shims, in order to ensure that the mounting distance is 1.4mm with -/+ 0.05 mm tolerance.

H 1.4mm +0/-0.05
In an optimal mounting, the signal amplitude values generated by the encoder, would be in the middle of the range of the signal plot shown in the Encoder Explorer software (see plot below). This may vary according to the encoder type.
The DS-25 amplitudes compensation
If as part of the signal validation process (section 12.2) the signal amplitudes are not optimal, it is possible to improve/correct the mounting, by using 50 um shims below the rotor (available as DS-25-R-00 kit). Each will increase the amplitude level by ~ 50mV. Verify that the rotor mounting provides a good signal amplitude, by using the “Signal analyzer” or “Signal verification process”, of the Encoder Explorer tool, as part of the procedure the described in section 12.

Netzer Precision Position Sensors

DS-25-PG-V01 15

11. Electrical Connection
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:
11.1 Absolute position over SSi or BiSS-C
This is the power-up default mode

Electric EncoderTM

CLK / NCP RX [+] (gray) CLK / NCP RX [-] (blue)

Host System
5V

DATA / NCP TX [-] (yellow)

DATA / NCP TX [+] (green) 120

Gnd

(black)

(red)

SSi / BiSS interface wires color code

Clock +

Grey

Clock –

Blue

Data –

Yellow

Data +

Green

GND

Black

+5V

Red

SSi / BiSS output signal parameters
Output code Serial output Clock Clock frequency Position update rate

Clock
Data Ground Power supply
Binary Differential RS-422 Differential RS-422 0.1-5.0 MHz 35 kHz (Optional – up to 375 kHz)

16 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

11.2 Digital SSi Interface

Synchronous Serial Interface (SSi) is a point to point serial interface standard between a master (e.g. controller) and a slave (e.g. sensor) for digital data transmission.
Tr

Master Clock

1 23 4

Encoder Data

T MSB n-1 n-2 n-3

n n+1

Tp Tm LSB

MSB

Tu
Built In Test option (BIT) The BIT indicates critical abnormality in the encoder internal signals. ‘0’ the internal signals are within the normal limits, ‘1’ Error The Part Number of the encoder indicates whether the encoder includes BIT. If no BIT is indicated in the PN, there is no additional error bit.
Tr

Master Clock

1 23 4

Encoder Data

T MSB BIT n-1 n-2

n+1 n+2

Tp Tm LSB

MSB

n T f= 1/T Tu Tp Tm Tr fr=1/Tr

Description

Recommendations

Position resolution

12-21

Clock period

Clock frequency

0.1-5.0 MHz

Bit update time

90 nsec

Pause time

26 – sec

Monoflop time

25 sec

Time between 2 adjacent requests Tr > n*T+26 sec

Data request frequency

Netzer Precision Position Sensors

DS-25-PG-V01 17

11.3 Digital BiSS-C Interface
BiSS-C Interface is unidirectional serial synchronous protocol for digital data transmission where the Encoder acts as “slave” transmits data according to “Master” clock. The BiSS protocol is designed in B mode and C mode (continuous mode). The BiSS-C interface as the SSi is based on RS-422 standards.
Built In Test option (BIT) The BIT indicates critical abnormality in the encoder internal signals. ‘1’ the internal signals are within the normal limits, ‘0’ Error The Part Number of the encoder indicates whether the encoder includes BIT. If no BIT is indicated in the PN, the error bit is always 1.
Master Clock

Encoder Data

Ack Start 0

Position (bits)

Err W

CRC (6 bits)

Timeout

Bit allocation per encoder-resolution 17bit 18bit 19bit 20bit
27 28 29 30 Ack
26 27 28 29 Start 25 26 27 28 “0” 8…24 8…25 8…26 8…27 AP

Description
Period during which the encoder calculates the absolute position, one clock cycle Encoder signal for “start” data transmit “Start” bit follower Absolute Position encoder data

Default Length

1/clock

1 bit

Per resolution

Error BIT (Built In Test option)

Warn. Warning (non active)

0…5 0…5 0…5 0…5 CRC

The CRC polynomial for position, error and warning data is: x6 + x1 + x0. It is transmitted MSB first and inverted. The start bit and “0” bit are omitted from the CRC calculation.

Timeout Elapse between the sequential “start”request cycle’s

1 bit 1 bit 6 bits
25 s

18 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

11.4 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

Gray SSi Clock / NCP RX
Blue

Clock / RX + Clock / RX –

SSi Data / NCP TX

Yellow Green

Data / TX Data / TX +

Ground

Black

GND

Power supply

Red

+5V

Pin No 2 1 4 3 5 8

Setup USB

Blue Box or

Electric Encoder

USB
NanoMIC

Setup SSI / BiSS

Electric Encoder

Connect Netzer encoder to the converter, connect the converter to the computer and run the Electric Encoder Explorer Software Tool

11.5 Electrical connection and grounding
Observe the following grounding consideration: 1. The cable shield electrically floating (unconnected) by default.
2. Make sure the chassis is grounded.
3. It’s highly recommended to keep the motor PWM wires electrically shielded and/or kept away from the encoder.
Note: 4.75 to 5.25 VDC power supply required

Netzer Precision Position Sensors

DS-25-PG-V01 19

12. Signal Verification
12.1 Starting the Encoder Explorer
Make sure to complete the following tasks successfully: Mechanical Mounting Electrical Connection to the encoder Encoder Explore Software Installation
Run the Encoder Explorer tool (EE)
Ensure proper communication with the encoder: (Setup mode by default). The Encoder position-dial is colored blue when in Setup Mode, either through the NanoMic or the BlueBox (a). Note that the operational mode is not available through the BlueBox (b). The Signal amplitude bar indicates whether the signal is within the acceptable tolerance (c) . Note that prior to performing the Signal Verification process the bar could indicate an out of tolerance signal (d). Encoder data is displayed in the encoder data area (CAT No., Serial No.) (e). The position dial display responds to shaft rotation (f ).
a f

b e
c

d
It is important to perform the Signal Verification process prior to the calibration of the encoder to ensure optimal performance.

20 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

12.2 Signal verification process
The Signal Verification process ensures that the encoder is mounted correctly and provides good signal amplitudes. This is performed by collecting raw data of the fine and coarse channels during rotation.
Select <Signal Verification> on the main screen (a).

Select <Start> to initiate the process (b).
b Rotate the shaft in order to collect the fine and coarse channels data (c).
c

Netzer Precision Position Sensors

DS-25-PG-V01 21

If the process is successful, the status “Signal verification successful” would appear (d). The `amplitude circle’ would be centered between the two green circles, preferably in the middle of the tolerance (e).
d
e
Note however, that mounting the encoder towards the extreme mechanical tolerances might cause the amplitude circle to be offset from the exact middle of the nominal position. If the signal is out of tolerance the Error notification “Amplitude is lower/higher than the min/max limit of XXX” would appear (g). In Addition, the status “Signal verification failed perform calibration amplitude” would appear at the top (h).
h
g
Stop the process and re-mount the encoder, making sure that the mechanical installation tolerances are not exceeded, removing or adding shims as required.
Repeat the Signal Verification process after the remount. Once the signal verification process is successfully completed, proceed to the encoder calibration phase, Section 13

22 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

13. Calibration
It is important that upon every installation of the encoder, the Signal Verification process is completed prior to attempting calibration of the encoder. For encoders with FW 4 version 4.1.3 or higher, it is possible to select either a fully automated calibration process, or a manual phase-by-phase calibration process.
13.1 Auto-calibration
Auto Calibration is supported by encoders with FW 4 version 4.1.3 or higher. For these encoders an additional “Auto-calibration” button is displayed.

13.1.1 Auto-calibration process
The Auto-calibration process consists of three stages:
1. Jitter test – evaluates the electric noise for the Fine, Medium, and Coarse encoder channels. During the jitter test, the shaft must be stationary. Attention! The Pass/Fail criteria of the Jitter test is according to very strict factory criteria and failing it would abort the Auto Calibration process. However, the manual Jitter test as part of the Manual Calibration process in section 13.4, would enable the user to decide whether the jitter is acceptable to its needs.
2. Offset calibration – performs the offset calibration, the shaft must rotate continuously.
3. Absolute Position (AP) calibration – performs Coarse Amplitude Alignment (CAA) and Medium Amplitude Alignment (MAA) are calculated.
During Auto-Calibration process the encoder’s Zero-Position remain in the factory default zero position for new encoders. It is possible to set the Zero Point through the top menu bar, by selecting “Calibration” tab, and clicking “Set UZP” as defined in section 13.3.

Netzer Precision Position Sensors

DS-25-PG-V01 23

13.1.2 Performing Auto-calibration
Press the <Auto-calibration> button. The main auto-calibration window opens. Select the appropriate measurement range applicable to your application (a).
a
Make sure to keep the shaft still and press the <Start> The Noise test would be performed and upon successful completion the “Noise test”label will be marked with a green check mark. The Offset calibration would automatically start upon completion of the Noise test. This calibration requires that the shaft be rotated continuously. The AP calibration would automatically start upon completion of the Accuracy Calibration. Continue rotating the shaft in this phase until the AP calibration is completed, and the encoder is reset. Once the reset is over, the Auto-calibration process is successfully finished.

The user can review the calibration results by clicking the <View data> button (b). 24 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

It is always possible to abort the Auto Calibration process by clicking the <Abort> button (c).
13.1.3 Auto-calibration failures
If a test fails (for example the Noise test) the result will be marked with in red X.

If the calibration process failed, corrective recommendations will be displayed, corresponding to the element which had failed the test.

Netzer Precision Position Sensors

DS-25-PG-V01 25

d It is possible to review detailed information regarding the failure, by clicking the <Detailed data> button (d).

13.2 Manual calibration
The Manual calibration process consists of the following stages: 1. Offset calibration – performs the offset calibration, the shaft must rotate continuously. 2. CAA / MAA Calibration – performs Coarse Amplitude Alignment (CAA) and Medium Amplitude Alignment
(MAA) are calculated 3. Zero Position Set – Used to determine a Zero Position other than the factory default. 4. Jitter Test – Used to determine the amount of jitter and allow the user to decide if acceptable.

26 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

Select <Manual Calibration> on the main screen (a).

13.2.1 Offset calibration
In this process, the DC offset of the sine and cosine signals are compensated over the operational sector (offset calibration). Click <Start data acquisition> (b). Rotate the shaft continuously during data collection, covering the whole working sector of the application
from end to end. The progress bar (c) indicates the progress of the data collection. Rotation speed is not a parameter during data collection. By default, the procedure collects 500 points. The collected data for the fine / coarse channels, should be a clear “thin” circle which appears in the center of the plots (d) (e) with a possible slight offset.
c
b d

e f

When offset calibration is completed, click on <Continue to CAA/MAA Calibration> button (f ).

Netzer Precision Position Sensors

DS-25-PG-V01 27

13.2.2 Calibration of Coarse Amplitude Alignment (CAA) & Medium Amplitude Alignment (MAA)
The following calibration aligns the coarse channel, and medium channel in certain encoders, with the fine channel by collecting data from each point in both channels. This is performed to make sure that every time the encoder is turned on, it would provide an accurate absolute position. Select the relevant option from the Measurement Range options (a):
Full mechanical rotation – shaft movement is over a full 360 degrees rotation (that is the recommended calibration). Limited section – shaft has a limited rotation angle which is less than 360 degrees. In this mode you need to input the rotation range by degrees. Free sampling mode – sets the number of calibration points in accordance with the total number of points in the text box. The system displays the recommended number of points by default. The minimum points over the working sector is nine. Note that the Total number of points would change to the optimal default according to the selected measurement range above. Click the <Start Calibration> button (b).
a
b

28 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

The Calibration process control (c) indicates the current position, and the next target position to which the shaft should be rotated.
Rotate the shaft to the next position, stop and click the <Continue> button to sample the position (d). The shaft should be at STAND STILL when clicking the button.

e
d c
f
The Shaft movement status (e) indicates the shaft movement status. Complete the sampling process using the following routine: positioning the shaft –> stand still –>
clicking <Continue> (d) to sample the position. When the process is completed click the <Apply and Continue to UZP> button (f ).

Netzer Precision Position Sensors

DS-25-PG-V01 29

13.3 Setting the zero-position of the encoder
Select one of the options for setting the zero point and click <Apply and close>. It is possible to set either current position or rotate the shaft to any other position to be set as the zero point.
It is also possible to set the Zero Point through the top menu bar, by selecting “Calibration” tab, and clicking “Set UZP”.

30 DS-25-PG-V01

Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

13.4 Jitter test
The jitter test is used evaluate the level of electric noise.
Common jitter should be up +/- 3 counts; higher jitter may indicate system noise and would require better grounding or shielding of the electric noise source.
Select “Calibration” tab, and click “Jitter Test”

Select the Jitter test mode (a). Set the Timing and Sampling parameters (b). Click <Start> button (c) and check if the results (d) are within acceptable tolerances for the intended
application.
b a
c d

Netzer Precision Position Sensors

DS-25-PG-V01 31

Another indication of excessive jitter/noise when the blue dots in signal amplitude circle are not evenly distributed on a thin circle as appears below.

Excessive jitter/noise

Low jitter/noise

14. Operational Mode
14.1 SSi / BiSS
Operational Mode indication of the SSi / BiSS encoder interface is available by using the NanoMIC to connect with the encoder. When in Operational Mode the color of the position dial is orange.
For more information read about NanoMIC on Netzer website
The operational mode is using SSi / BiSS interface with 1MHz clock rate.
The encoder position-dial is colored orange when in Operational Mode. The bar below the dial, is the corresponding binary word output for the current shaft position (a).

SSi Protocol

BiSS Protocol

a 32 DS-25-PG-V01

a
Product Guide

Absolute Rotary Encoder

Hollow Shaft Three-plate

DS-25

PRODUCT GUIDE

Netzer Precision Position Sensors

DS-25-PG-V01 33

DS-25-PG-V01

Corporate Headquarters
Netzer Precision Position Sensors A.C.S. Ltd. Misgav Industrial Park, P.O. Box 1359 D.N. Misgav, 2017400 Israel Tel: +972 4 999 0420
www.netzerprecision.com
Copyright © 2023 Netzer Precision Position Sensors A.C.S. Ltd. All rights reserved.