Aerotech Encoder Conditioning Unit Manuel utilisateur

Revision: 1.02.00

Encoder Conditioning Unit

(ECU)Hardware Manual

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United States (World Headquarters)

Email: Support@aerotech.com

Phone: +1-412-967-6440

Fax: +1-412-967-6870

101 Zeta Drive

Pittsburgh, PA 15238-2811

www.aerotech.com

United Kingdom China

Email: Support@aerotech.com

Phone: +44 (0)1256 855055

Fax: +44 (0)1256 855649

Email: Support@aerotech.com

Phone: +86 (21) 5508 6731

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Phone: +49 (0)911 967 9370

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Email: Support@aerotech.com

Phone: +886 (0)2 8751 6690

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Email: Support@aerotech.com

Phone: +33 2 37 21 87 65

This manual contains proprietary information and may not be reproduced, disclosed, or used in whole or in part without the

express written permission of Aerotech, Inc. Product names mentioned herein are used for identification purposes only and

may be trademarks of their respective companies.

ECU Hardware Manual Declaration of Conformity

EU Declaration of Conformity

Manufacturer

Aerotech, Inc.

Address

101 Zeta Drive

Pittsburgh, PA 15238-2811

USA

Product

ECU

Model/Types

All

This is to certify that the aforementioned product is in accordance with the applicable requirements of the

following Directive(s):

2014/35/EU Low Voltage Directive

and has been designed to be in conformity with the applicable requirements of the following Standard(s)

when installed and used in accordance with the manufacturer’s supplied installation instructions.

BS EN 61000

BSEN 55011

Authorized Representative:

Simon Smith, European Director

Address:

Aerotech Ltd

The Old Brick Kiln, Ramsdell, Tadley

Hampshire RG26 5PR

Name

/ Alex Weibel

Position

Engineer Verifying Compliance

Location

Pittsburgh, PA

Date

10/8/2019

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Declaration of Conformity ECU Hardware Manual

4 www.aerotech.com

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ECU Hardware Manual Encoder Conditioning Unit

Chapter 1: Encoder Conditioning Unit (ECU)

The ECUinterface is designed for use with any 1 Vpp analog encoder.

It dynamically applies Automatic Offset, Balance and Gain Control (AOC, ABC, AGC) to the input signals.

Accurate, constant amplitude 1 Vpp industry standard signals are then output.

A tri-colored LED indicates input signal strength and allows ease of setup for optimum performance. If this

LED is not visible when the interface is installed, a separate external setup signal can be used and a

calibration cycle also helps to simplify installation.

These features result in the output signals having very low cyclic error, typically less than 50 nm.

The interface is fully RoHS compliant and also supports readheads with single or dual limit outputs.

lCompatible with all standard 1 Vpp analog output readheads

lOutputs accurate, industry standard, 1 Vpp analog differential signals

lLow cyclic error

lTri-color integral setup LED

lUser selectable automatic gain control (AGC)

lAutomatic offset and balance control (AOC and ABC)

lSingle or dual-limit capability

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Encoder Conditioning Unit ECU Hardware Manual

1.1. Interface Features

1.1.1. Self-Tuning Active Correction

The ECU interface actively corrects for input signal imperfections to optimize system accuracy. Corrections

are made for the following:

Automatic Offset Control (AOC) adjusts offset independently for the sine and cosine signals

Automatic Gain Control (AGC) ensures consistent 1 Vpp signal amplitude

Automatic Balance Control (ABC) adjusts the gain to equalize the sine and cosine signals

These correction mechanisms operate over the full working speed range of the readhead. The user can

disable/enable the AGC by pressing the calibrate button for greater than 3 seconds.

1.1.2. LED Indicators

The tri-colored SETUP LED provides visual feedback of signal strength and error condition for setup and

diagnostic use. It flashes Off momentarily to indicate a reference mark, up to 100 mm/s only

Table 1-1: Setup LED

Color State Indication %

Purple FLASHING High Signal Alarm Condition >135%

ON High Signal >110% and <135%

Blue FLASHING Over Speed Alarm Condition

ON Optimum Signal >90% and <110%

Green ON Acceptable Signal >70% and <90%

Orange ON Low Signal >50% and <70%

Red ON Unacceptable Signal >20% and <50%

FLASHING Unacceptable Signal Alarm Condition <20%

The Yellow CAL/AGC LED indicates when the ECU is in a calibration routine and whether or not AGC is

active

Table 1-2: CAL/AGCLED

Color State Indication

Yellow

ON AGC active

OFF AGC inactive

SLOWFLASH calibration routine

FASTFLASH calibration failure

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ECU Hardware Manual Encoder Conditioning Unit

1.1.3. Calibration Procedure

The calibration procedure is required to optimize the gain, balance and offset of the analog input signals in

the ECU interface.These settings are then stored and recalled for initial use at startup.

To calibrate the system, the following sequence should be carried out:

lPrior to calibration, AGC should be off. To switch AGC on or off, the calibrate button should be

pressed for more than 3 seconds. When AGC is on, the CAL/AGC LED will be on and when AGC is

off, the CAL/AGC LED will be off.

lInstall the readhead and set up to obtain optimum (1 Vpp) signal amplitude

lEnter the calibration routine by pressing the CALIBRATE button momentarily. The calibration

routine is indicated by slow flashing of the CAL/AGC LED.

lTraverse the readhead slowly past the scale until the CAL/AGC LED stops flashing. The calibration

cycle is now complete.

If calibration fails, the CAL/AGC LED will flash quickly instead of switching off. If this happens the

CALIBRATE button should be pressed momentarily to exit the calibration routine. The calibration procedure

should then be repeated.

If the unit continues to fail calibration, factory default settings should be restored by powering down, then

pressing the CALIBRATE button as power is re-applied. The calibration procedure should then be repeated.

N O T E : To exit the calibration routine at any time, the CALIBRATE button should be pressed

momentarily.

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Encoder Conditioning Unit ECU Hardware Manual

1.2. Operating and Electrical Specifications

Table 1-3: Analog Specifications

Specification Description

Power

Supply

5 V -5% + 10%

ANALOG:150 mA current consumption (interface only), when

terminated with 120 Ω. Provision is given to feed a maximum of an

additional 100 mA to the readhead. The interface will be fully active <300

ms after power is applied. Encoder systems must be powered from a 5 V

dc supply complying with the requirements for SELV of standard EN

(IEC) 60950. Provision is given for remote sensing via two conductors of

the cable. The interface and readhead are protected from reverse voltage

and over voltage of up to 12 V.

Ripple 200 mVpp maximum @ frequency up to 500 kHz maximum

Acceleration Operating 500 m/s2BS EN60068-2-7:1993 (IEC 68-2-7:1983)

Shock Non-Operating 1000 m/s2, 6 ms, 1/2 sine BS EN60068-2-27:1993 (IEC 68-2-27:1987)

Vibration Operating 100 m/s2, 55 to 2000 Hz BS EN60068-2-6:1996 (IEC 68-2-6:1995)

Temperature Storage -20°C to +70°C

Operating 0°C to +55°C

Humidity Storage 95% maximum relative humidity (non-condensing)

Operating 80% maximum relative humidity (non-condensing)

Sealing IP40

Mass 95 g

EMCCompliance BS EN 61000 BS EN 55011

Connectors (input/output) 15-Pin D type socket/plug

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ECU Hardware Manual Encoder Conditioning Unit

1.3. I/O Signals

The ECU interface is designed to be used with industry standard 1 Vpp readheads. Cos, Sin, and reference

mark differential input signals should have nominal signal amplitude of 1 Vpp developed across 120 Ω input

termination resistor.

One or two open collector limit switch signals, active high or active low can also be input.

Table 1-4: 15 Pin ‘D’ Type Socket

Pin Signal Description Connector

1 COS-N Cosine-N

2 SIN-N Sine-N

3 MRK Reference mark

4 5 V 5 V power supply

5 5 V 5 V power supply

6 – Not connected

7 SETUP Setup signal/second (P) limit switch on dual limit readheads

8VqFirst (Q) limit switch

9 COS Cosine

10 SIN Sine

11 MRK-N Reference mark

12 COM 0 V power supply

13 COM 0 V power supply

14 – Do not connect

15 Inner Cable’s inner shield connection to 0 V

Table 1-5: 15 Pin ‘D’ Type Plug

Pin Signal Description Connector

1 COS-N Cosine-N

2 SIN-N Sine-N

3 MRK Reference mark

4 5 V 5 V power supply

5 5 V 5 V power supply

6 BID Bi/uni-directional reference mark select

7 SETUP Setup signal/P limit switch on dual limit readheads

8VqQ limit switch

9 COS Cosine

10 SIN Sine

11 MRK-N Reference mark

12 COM 0 V power supply

13 COM 0 V power supply

14 DIR Direction selector for reference mark

15 - Not connected

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Encoder Conditioning Unit ECU Hardware Manual

Figure 1-1: Analog Output Specifications

W A R N I N G : The outer shield should be connected to the earth ground. The inner shield

should be connected to 0V. Care should be taken to ensure that the inner and outer shields are

insulated from each other. If the inner and outer shields are connected together, this will cause a

short between 0V and earth, which could cause electrical noise issues.

10 www.aerotech.com

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