502-846 vA.0 FBT-11 Users Guide
Contents
1. FBT 11 Fieldbus Fault Generator User Manual X Relcom Inc INDUSTRIAL LAN WIRING COMPONENTS AND TESTERS 2221 Yew Street Forest Grove OR 97116 USA 503 357 5607 503 357 0491 FAX www relcominc com 502 846 FBT 11 User Manual Rev A 0 Copyright Relcom Inc 2012 All rights reserved No part of this manual may be reproduced photocopied stored on a retrieval system or transmitted without the express prior written consent of Relcom Inc Relcom Inc 2221 Yew St Forest Grove OR 97116 USA Tel 503 357 5607 Fax 503 357 0491 www relcominc com 2 502 846 FBT 11 User Manual Rev A 0 Table of Contents I Table of Contents I Table of Contents see ee ese ee ee AA ee RR Re ee ee 3 IL 0 Introduction sakset ee ere ener re tutea aaeei a aea 4 Mei es EE EE Ee als 5 StartUD iss Ee ea ee ER Ge ee De ee SE 30 SPEER 5 Inducing BUS Noise ese ee ee ee AA ee ee AA ee ee 5 Internal Current Load si aaaea aa bastante ge SR hane 7 Snield Sh rti Es ER EE dn Ee ee Ene AR EE ek 7 Signal AtftenuatiON iese ee ee Re ee AR Re ee ee RR Re ee 8 IV ACCESSOMES RE PN AN GEN Arenaen 9 Vi Specifications sensencan EE EE annie 10 VEE SEVICE EE eee 11 IR ET ES RR EE E 12 VIII Revision HiStOFY sesse ees ees se ee ee ee ee ee ee ee ee ee ee ee ee 13 502 846 FBT 11 User Manual Rev A 0 3 Introduction ll Introduction The FBT 11 Fieldbus Fault Generator is a Foundation Fieldbus physical segme2. of warranty status must have an RMA issued before being shipped An RMA can be obtained by contacting Relcom 502 846 FBT 11 User Manual Rev A 0 11 Specifications V Specifications Input Voltage Max Input Current Current Load Off Current Load Max Max Power Dissipation Current Load Off Current Load Max Operating Temperature Dimensions Weight Case material LF Noise Frequency LF Noise Amplitude FF Noise Frequency FF Noise Amplitude HF Noise Frequency HF Noise Amplitude Current Load Range Signal Attenuation Max 9 5 to 32 VDC 33mA 143mA 1 06 W max 32 VDO 4 58W max 32 VDC 0 to 35 146 x 88 x 28 mm 5 7 x 3 5 x 1 1in 0 18kg 0 4lb 500 Hz OmVpp 1000mVpp 100mV 20 kHz OmVpp 925mVpp 65mV 200 kHz OmVpp 625mVpp 25mV Min 18mA 4 2mA Max 100mA 10mA 50 At 20kHz The Fault Generator is powered by the Fieldbus and draws at least 14 mA of current from the segment depending on bus voltage device settings and ambient temperature Specifications subject to change without notice 10 502 846 FBT 11 User Manual Rev A 0 Operation Internal Current Load The fault generator has an internal high impedance current sink that can simulate the increased current draw of adding up to 5 fieldbus devices to a bus To turn on the current load flip the Current Load switch to the ON position The amount of curren
3. al Atten knob to the right At a setting of 1 the Fault Generator provides no attenuation to the fieldbus signal At a setting of 10 the Fault Generator attenuates the signal by 50 To test this function on a non communicating fieldbus first set the Signal Atten to 1 the Noise Frequency to HF and the Noise Amp to 10 Using an oscilloscope or an FBT 6 it should be visible that there is a signal on the bus Slowly rotate the Signal Atten knob to the right The level of the signal on the bus should begin to decrease as the knob is rotated Returning the knob to 1 will return the signal of its original level Note The bus signal attenuation does not change linearly as the knob is turned 8 502 846 FBT 11 User Manual Rev A 0 Accessories IV Accessories Part Description Picture Number FBT A61 FBT 6 Fieldbus Cable with Mini Hook Probes FBT A63 FBT 6 Fieldbus Cable with Clip on Probe FBT A64 Clip on Probe Contact Relcom directly for pricing and availability www relcominc com or call 1 503 357 5607 502 846 FBT 11 User Manual Rev A 0 9
4. easurement device such as the FBT 6 Table 2 shows the measurement noise ranges for the FBT 6 Low Frequency Band 50Hz to 4KHz Fieldbus Frequency Band 9KHz to 40KHz High Frequency Band 90KHz to 350KHz Table 2 When introducing noise at 20 kHz which lies in the fieldbus frequency range devices will begin to drop from the segment as the noise is increased If the noise is increased to a high enough level the FBT 6 will be unable to distinguish proper fieldbus signals from noise and will cease decoding 20KHz noise may also cause a large number of retransmits This noise may even distort proper fieldbus signals enough so that the DCS or FBT 6 will detect phantom devices or devices that do not exist but show up on a device list It is recommended to set the Signal Atten dial to 1 and the Shield Short switch to None while using the bus noise feature to obtain the best results 6 502 846 FBT 11 User Manual Rev A 0 Service VI Service The Fault Generator does not contain any user serviceable parts All adjustments and or repairs have to be performed at the factory If the FBT 11 needs to be serviced return it to Relcom Inc If the Fault Generator is still under warranty the repairs or replacement will be made free of charge For service outside the warranty please call or write before sending the Fault Generator to determine the charges for the service All devices sent to Relcom regardless
5. n of any defect Relcom Inc shall at its option repair or replace the defective unit In no event does Relcom Inc assume liability for incidental or consequential damages This warranty is the extent of the obligation or liability assumed by Relcom Inc and no other warranty or guarantee is either expressed or implied Relcom Inc reserves the right to make design changes to the FBT 11 without notice and with no obligation to make the same or similar changes to units previously manufactured Relcom Inc has made every effort to assure the accuracy of the information contained in this manual Relcom is not however responsible for any errors or omissions Please contact us with any questions or suggestions Relcom Inc 2221 Yew St Forest Grove OR 97116 USA Tel 503 357 5607 Fax 503 357 0491 Email FBT11 relcominc com www relcominc com 12 502 846 FBT 11 User Manual Rev A 0 Operation Ill Operation current from the fieldbus segment it is connected to Verify adequate current is available before connecting the Fault Generator or bus communications may be impacted The Fault Generator draws a minimum of 14mA of Startup The Fault Generator is powered by the segment it is connected to and turns on automatically Begin by connecting the color coded leads to both the FBT 11 as well as the fieldbus segment you wish to test If connected correctly a green Power LED will illuminate signifying the
6. nt tool designed to test the susceptibility of a segment to various faults that may occur in the field It allows both engineering and service technicians to determine the health of fieldbus segments This manual was current at the time of printing Go to www relcominc com for an electronic copy of the latest version of this manual Further information on fieldbus is available in the Fieldbus Wiring Guide also available on the website Summary of Features The Fault Generator includes the following features e Places variable frequency and amplitude noise onto the bus e Attenuates bus signals e Simulates the current draw of adding up to 5 standard 20mA Fieldbus devices on a segment e Causes shield shorts to the positive and negative Fieldbus lines 4 502 846 FBT 11 User Manual Rev A 0 Revision History Vill Revision History Revision Date Description A 05 21 2012 Original Release Relcom Inc 2221 Yew St Forest Grove OR 97116 USA Tel 503 357 5607 Fax 503 357 0491 www relcominc com 502 846 FBT 11 User Manual Rev A 0 1 3 Warranty Vil Warranty Relcom Inc warrants the FBT 11 to perform as described in this manual under normal use for a period of one year after delivery to the original purchaser This warranty does not apply if the Fault Generator has been disassembled modified or used for purposes other than those described in this manual Upon verificatio
7. segment is device is ready to use To ensure the segment is affected as little as possible upon power up set the controls of the device as follows Noise Frequency OFF Current Load 1 Signal Atten 1 Shield Short None Current Load OFF Noise Amp 10 The input of the Fault Generator is reverse polarity and fuse protected Inducing Bus Noise Sinusoidal noise may be introduced onto the bus by selecting one of four settings on the Noise Frequency dial Changing the setting on this dial changes the frequency and type of noise on the bus See table 1 for details 502 846 FBT 11 User Manual Rev A 0 5 Operation Setting Freguency Noise Type OFF N A None LF 500 Hz Constant Sinusoidal FF 20 KHz Constant Sinusoidal FF gated 20 kHz Pulsed Sinusoidal HF 200 kHz Constant Sinusoidal Table 1 Noise may be introduced at one of three frequencies 500Hz 20kHz and 200kHz The FFgated Signal places 20kHz noise on the bus in a 5ms on 390ms off pattern The amplitude of the noise is controlled by the Noise Amp dial When set to 1 no noise is introduced onto the bus Setting the dial to 10 will introduce the maximum level of noise onto the bus When introducing noise at either 500 Hz or 200 kHz a robust fieldbus should be able to withstand 200mV of noise without dropping devices The specific level of noise on the bus can be verified using an oscilloscope or a fieldbus m
8. t drawn by the load is varied by turning the Current Load dial Setting the dial at 1 causes a draw of about 18mA The current sink level can be increased up to 10 which draws about 100mA The amount of current taken by the load varies linearly as the dial is turned Care should be taken when using the internal current load as increasing the load too much may overload a fieldbus power supply It is recommended to verify the maximum current output of the power supply being used before using the current load function The current load function may be used in combination with any of the other functions of the Fault Generator Shield Short The Fault Generator s shield short function allows the user to cause shorts from either the positive or negative fieldbus lines to the shield To cause a short between the shield and positive fieldbus line move the Shield Short switch to To cause a short between the shield and negative fieldbus line move the Shield Short switch to The shield short function may be used in conjunction with any of the other Fault Generator functions 502 846 FBT 11 User Manual Rev A 0 7 Operation Signal Attenuation The fault generator makes it possible to attenuate the signal being sent on a fieldbus segment The FBT 11 can attenuate fieldbus signals from 0 to 50 of the signal s original level at 20KH2 To attenuate fieldbus signals rotate the Sign
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