APPLICATION NOTES TECHNICAL NOTE TN 494
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1 APPLICATION NOTES TECHNICAL NOTE TN 494 MAXIMUM PERMISSIBLE LENGTHS OF ELECTRIC CABLES FOR THE CONNECTION OF HYDRAULIC VALVES WITH INTEGRATED ELECTRONICS CA ; Version.0, 05/08
2 Copyright Copyright 2006, 2008 Moog GbH Hanns-Kle-Straße Böblingen Gerany Telephone: Fax: E-ail: Internet: All rights reserved. No part of this docuent ay be reproduced in any for (print, photocopies, icrofil, or by any other eans) or edited, duplicated, or distributed with electronic systes without our prior written consent. Offenders will be held liable for the payent of daages. Subject to change without notice. We reserve the right to ake changes to this docuent at any tie and without specified reasons. Copleteness This docuent is coplete only when used in conjunction with the product-related hardware and software docuentation required for the relevant application, as for exaple operating instructions of the valve and other anuals. Selection and qualification of personnel As specified in the product-related hardware and software docuentation required for the relevant application, only users properly qualified and authorized for these tasks ay work with and on our products. Note This docuent has been prepared with great care in copliance with the relevant regulations, state-of-the-art technology and our any years of knowledge and experience, and the contents have been generated to the best of the authors' knowledge. However, the possibility of error reains and iproveents are possible. Please feel free to subit any coents about possible errors and incoplete inforation to us. Table of Contents Introduction Typ. values for copper cables Cable resistance Cable capacitance Volt power supply cables Length related voltage drop Exaples Signal cables Analog signal cables Influence of the resistance R Influence of the distributed capacitance Recoendations Digital signal cables Digital signal input cables Digital signal output cables Field bus cables...4 Moog GbH Technical Note TN 494 (CA ; Version.0, 05/08) 2
3 Introduction Introduction Usually, our hydraulic valves with integrated electronics are supplied with 24 V and are controlled via analog or digital signal cables. This technical note shall assist in the diensioning and design of the power and signal cabling, to ensure a sufficient supply voltage and signal quality under all perissible operating conditions. The axiu perissible length of supply and signal cables is liited by the ipedance (resistance and capacitance) of the cable. 2 Typ. values for copper cables The ical values entioned below are used in the exeplary calculations of the following sections. 2. Cable resistance The ical resistance R of a copper cable of the length l is calculated as follows: R ρcu Ω l 23. q 73 where: q 0,75 2 (8 AWG) ρ Cu 0,078 Ω 2 l ical cross-section of connection cables specific resistance of copper at 20 C (68 F) 2.2 Cable capacitance The ical distributed capacitance of copper cables is 50 pf/. The ical capacitance C of a copper cable of the length l is calculated as follows: C 50 pf l 3 24 Volt power supply cables The axiu perissible length l ax of the power supply cable is calculated as follows: l ax U U l ab _ ax ab Uab Uab _ ax l ax l where: U ab_ax 6 V axiu perissible voltage drop over the supply cable U ab_ax 24 V - U in U in 8 V lowest perissible valve power supply voltage Uab l length related voltage drop ( "3. Length related voltage drop") This calculation does not include a potential reduction of the output voltage of the power supply due to the connected load. It does neither include the voltage drops, which ay be caused by switching on further loads. 3. Length related voltage drop Figure : Voltage drop on the power supply cable The length related voltage drop over the ain and the return line of the supply cable is calculated as follows: Uab R Ω 2 Iax 2 Iax l l where: I ax axiu current consuption of the valve (can be taken fro the operating instructions of the valve) R ical cable resistance ( "2. Cable resistance") l supply cable length Moog GbH Technical Note TN 494 (CA ; Version.0, 05/08) 3
4 4 Signal cables 3.2 Exaples Valve series Max. current consuption I ax Voltage drop U l ab Max. perissible cable length l ax D A 4 V/ 428 (,404 ft.) D A 7 V/ 364 (,94 ft.) D A 38 V/ 57 (55 ft.) D636/8 200 A 57 V/ 06 (347 ft.) D A 04 V/ 58 (90 ft.) 4 Signal cables 4. Analog signal cables 4.. Influence of the resistance R Due to sall values of signal currents, the influence of the resistance R of the cable used on the axiu perissible cable length l ax for signal cables is very sall. Exaple: In accordance with the following forula, the resistance R for a cable length of 428 (,404 ft.) is only 0 Ω. ρcu Ω R l Ω q 4..2 Influence of the distributed capacitance The influence of the distributed capacitance of the cable used on the axiu perissible cable length l ax for signal cables is significantly larger. This capacitance C increases with cable length. Together with the input resistance, it fors a first order high pass filter. High frequency interferences ay be coupled into the input circuitry as a result. The cut-off frequency of the high pass is calculated as follows: f g 2 π R C Thus, the filter cut-off frequency f g of the high pass decreases with the length of cable. Exaple: A cable length l of 0 (32.8 ft.) a ical analog input resistance R of 0 kω results in accordance with the following forula in a cut-off frequency f g of 32 khz. f f f g g g 2 π R C 2 π 0 kω khz 2 π R 50 pf 0 pf l 4..3 Recoendations EMC testing according to EN :200-0 was perfored using 0 (32.8 ft.) of cable and a differential voltage coand signal. The deviation of the spool position signal during interference testing (electroagnetic coupling, fast transients) was less than %. This ay increase when using longer cables. Experience shows that with cables longer than 5, a current input configuration should be used. With this configuration, the input resistances are 50 ties lower. The cut-off frequency f g of the high pass filter ( "4..2 Influence of the distributed capacitance") increases by the sae factor. This leads to the input becoing less sensitive to interference. Furtherore, when using a current input source there is no influence due to a voltage drop over the cable. We always recoend a differential input configuration, irrespective of whether a current or voltage coand is used. In this configuration, syetrical interference on both input lines is effectively cancelled out. 4.2 Digital signal cables 4.2. Digital signal input cables Signal input cables, for instance Valve Enable, are less critical regarding their length, because the signal currents are low (< 20 A) and a greater signal-to-noise ratio is easier to achieve, because only two conditions/voltage level ust be differentiated Digital signal output cables The current in signal output cables, for instance Enable Acknowledgeent or Error Signal, can be up to.5 A. In this case the voltage drop over the cable length cannot be disregarded. Therefore for these cables the sae requireents are applicable as for the power cables ( "3 24 Volt power supply cables") Field bus cables The axiu digital field bus cable lengths can vary iensely. Norally they are terinated by a low ipedance to avoid signal reflection (power atching), which allows longer cables. The axiu perissible cable length for an individual field bus is defined in the respective standards and is, aongst other things, dependent on the data transission rate. Moog GbH Technical Note TN 494 (CA ; Version.0, 05/08) 4
5 4 Signal cables For your notes. Moog GbH Technical Note TN 494 (CA ; Version.0, 05/08) 5
6 MOOG.COM/INDUSTRIAL For the location nearest you, contact oog.co/industrial/globallocator Argentina Australia info.australia@oog.co Austria info.austria@oog.co Brazil info.brazil@oog.co China info.china@oog.co Finland info.finland@oog.co France info.france@oog.co Gerany info.gerany@oog.co Hong Kong info.hongkong@oog.co India info.india@oog.co Ireland info.ireland@oog.co Italy info.italy@oog.co Japan info.japan@oog.co Luxebourg info.luxebourg@oog.co Netherlands info.netherlands@oog.co Norway info.norway@oog.co Russia info.russia@oog.co Singapore info.singapore@oog.co South Africa info.southafrica@oog.co South Korea info.korea@oog.co Spain info.spain@oog.co Sweden info.sweden@oog.co Switzerland info.switzerland@oog.co United Kingdo info.unitedkingdo@oog.co USA info.usa@oog.co 2006, 2008 Moog GbH Technical Note TN 494 (CA ; Version.0, 05/08) All rights reserved. Subject to changes without notice.
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