Netzer DS-25 Everight Position User Guide
- June 9, 2024
- Netzer
Table of Contents
DS-25 Everight Position
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
S
SSi
I
BiSS
Resolution
Code Bit
F
17
G 18
H
19
CPR 131,072 262,144 524,288
BIT (Built In Test): Optional
[ ] None
B
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°
A
A
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
D
D
5. Mechanical Interface Control Drawing
Shaft – End installation (step)
M3 6 0 7.30 -0.05 *
16
0.05 B 0.05
B
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 *
A
0
6 -0.02 *
0.05 A
4
0.05
2
0.20 X 45°
3
1
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*
A
+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
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.
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°
x.
7
5*
A
+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
NO
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)
5V
DATA / NCP TX [+] (green) 120
Gnd
(black)
5V
(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
0
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
0
MSB
n T f= 1/T Tu Tp Tm Tr fr=1/Tr
Tu
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
0
1/clock
1
1 bit
0
1 bit
Per resolution
7
7
7
7
Error BIT (Built In Test option)
1
6
6
6
6
Warn. Warning (non active)
1
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
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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
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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
a
Select
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
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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
a
Make sure to keep the shaft still and press the
c
b
The user can review the calibration results by clicking the
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
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
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
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Absolute Rotary Encoder
Hollow Shaft Three-plate
DS-25
PRODUCT GUIDE
Select
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
a
b
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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
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
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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”.
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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
application.
b a
c d
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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
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Hollow Shaft Three-plate
DS-25
PRODUCT GUIDE
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DS-25-PG-V01
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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
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reserved.