Allen-Bradley MediaChecker 1788-MCHKR Скачать руководство пользователя страница 34

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Calculating the Distance to a Short

1788-UM002A-US-P – April 2000

Table 13. DeviceNet and DH+/RIO Cable Resistances

Cable Type

Data Pair

(H, L)

Power Pair

(+,-)

Shield

DeviceNet
Thick

0.0069

Ω

/ft

0.0226

Ω

0.0032

Ω

/ft

0.0105

Ω

0.00175

Ω

/ft

0.00575

Ω

DeviceNet
Thin

0.028

Ω

/ft

0.0918

Ω

0.01617

Ω

/ft

0.053

Ω

0.0032

Ω

/ft

0.0105

Ω

DeviceNet
KwikLink

0.00404

Ω

/ft

0.01325

Ω

0.00404

Ω

/ft

0.01325

Ω

DH+/RIO

0.00944

Ω

/ft

0.031

Ω

0.0041

Ω

/ft

0.0135

Ω

Table 14. ControlNet Cable Resistances

Cable Type

Center

Conductor

Shield

ControlNet RG6

0.028

Ω

/ft

0.0918

Ω

0.0036

Ω

/ft

0.0118

Ω

ControlNet RG6F

0.0099

Ω

/ft

0.0325

Ω

0.0029

Ω

/ft

0.0095

Ω

ControlNet DS3/4

0.0255

Ω

/ft

0.0836

Ω

0.0032

Ω

/ft

0.0105

Ω

Содержание MediaChecker 1788-MCHKR

Страница 1: ......

Страница 2: ...ypes of notes to help you use the MediaChecker safely and effectively ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or eco...

Страница 3: ...be present on nearby conductors Always turn on the MediaChecker before connecting it to a cable Turning the MediaChecker on activates the tool s input protection circuitry Do not open the MediaChecke...

Страница 4: ...tional arrow appears in the left side of the display Press the corresponding C or D key to display the additional information B E Enters a selection into the MediaChecker and moves to the next setup s...

Страница 5: ...m Description A Turns the MediaChecker off See Battery Save Mode for more information B Tests the attached cable and provides a pass or fail summary based on the parameters specified for the selected...

Страница 6: ...ecting unshielded UTP and foil screened FTP unshielded twisted pair cable for Ethernet IEEE 802 3 networks C BNC connector for connecting ControlNet cables Audible Signal Beeper The MediaChecker s bee...

Страница 7: ...hecker turns itself off when there is no switch or key activity for 10 minutes To return the MediaChecker to operation you must turn the rotary switch to OFF and wait 5 seconds before turning the Medi...

Страница 8: ...aChecker you must select proper cable type category and size before testing or measuring It may also be necessary to calibrate the MediaChecker to the cable under test See Calibrating the MediaChecker...

Страница 9: ...desired category is displayed then press E 6 Press C or D until the desired wire size is displayed then press E 7 Press A or turn the rotary switch to a new position to exit the setup menu Important Y...

Страница 10: ...cable under test Calibrating with cables longer than 100 ft 30 m will improve the accuracy of length measurements During the calibration process if the cable is found to be defective or if the cable i...

Страница 11: ...factory settings remove all cables from the MediaChecker press C D until YES appears then press E Press E anytime except in setup mode to see the calibration status for the currently selected cable 4...

Страница 12: ...ire Color V Red CAN_H H White Shield S Bare CAN_L L Blue V Black Table 6 Key to Twisted Pair Displays cont DH RIO Wire Phoenix Pin Display Clip Color RIO Color DH Color Line 1 1 1 Blue Blue Clear Shie...

Страница 13: ...on on calculating the length of a terminated cable see Calculating the Distance to a Short on page 32 2 For DeviceNet DH RIO and Ethernet cables connect the Cable ID to the far end of the cable if des...

Страница 14: ...Distance to open near end Yes 1 Yes 2 Yes Yes 2 Length Yes 1 Yes Yes Yes Split pair Yes 3 No Yes No Wire map Yes 4 Yes 4 Yes 4 No 1 Measured for the data pair only For shorted power wires the MediaCh...

Страница 15: ...ble and displays one of the following when a pass condition exists aan09f eps PASS means the cable is good RA means the Cable ID is detected aan59f eps means the Cable ID is not detected If the MediaC...

Страница 16: ...re is swapped with the shield OPEN is blinking This can mean one of the following The wire is open somewhere along the cable The and S wires are swapped somewhere along the cable 1 The MediaChecker mi...

Страница 17: ...o determine the distance to the short Three wires are shorted SHORT FAULT and OPEN are blinking 2 The L and wires are shorted to the shield S Use the measured resistance 6 in this case and the informa...

Страница 18: ...lculate the cable length See Calculating the Distance to a Short on page 32 The MediaChecker detects a fairly high resistance between the CAN_H and CAN_L data wires FAULT and OPEN are blinking A termi...

Страница 19: ...iaChecker detects a low resistance between the CAN_H and CAN_L data wires 2 SHORT 954 291 m and OPEN are blinking 1 There is a short between L and H The MediaChecker displays the most likely distance...

Страница 20: ...compared to the other wires OPEN is blinking The L wire is open at the near end To detect an open at the far end connect the Cable ID to the far end and repeat the test or connect the Cable ID to thi...

Страница 21: ...terminating resistor connected the MediaChecker sounds three short tones and displays the total resistance of the terminator and cable wires aan10f eps Important Coaxial cables must be unterminated f...

Страница 22: ...s resistance 75 from the measured resistance to get the cable resistance Then use the procedure under Calculating the Distance to a Short on page 32 to calculate the cable length The MediaChecker det...

Страница 23: ...002A US P April 2000 LENGTH WIRE MAP TEST SETUP ENTER OFF 80 Feet LENGTH WIRE MAP TEST SETUP ENTER OFF 70 Feet 0 SHORT 0 5 SHORT MediaChecker 1788 MCHKR MediaChecker 1788 MCHKR aan04f eps Figure 4 Tes...

Страница 24: ...check the cable selection The MediaChecker displays the cable selection for a few seconds and then starts the test If the cable selection is not correct refer to Preparing the MediaChecker for Use on...

Страница 25: ...lternately displays and RA when the Cable ID is detected but a problem with the cable or with the Cable ID is interfering with the identification process Without the Cable ID connected to the far end...

Страница 26: ...The wire is open at the far end or is swapped with the shield S Multiple shorts ss L and o are blinking ss blinking indicates a short from L to S L blinking indicates a fault between the L and wires...

Страница 27: ...compute the length If you require more accurate length measurements refer to Calibrating the MediaChecker to a Cable described on page 10 Before a length measurement is made the MediaChecker performs...

Страница 28: ...Important When a length measurement flashes on the display the length of the cable exceeds either the maximum allowed by the standard for DeviceNet DH RIO and Ethernet cables or the MediaChecker s ran...

Страница 29: ...eviceNet and DH RIO Length Calculations Formulas Measure drop lengths with the MediaChecker or a tape measure Trunk length Measured length Total actual length of drops Total drop length Measured lengt...

Страница 30: ...Example 1 Calculating trunk length A cable measures 750 ft long and has 16 unterminated taps From Table 12 16 unterminated taps 69 measured ft Trunk length 750 ft measured length 69 ft tap length 681...

Страница 31: ...9 ft 33 5 m 60 ft 18 5 m 15 117 ft 35 5 m 65 ft 19 5 m 16 125 ft 38 m 69 ft 21 m 17 133 ft 40 5 m 73 ft 22 5 m Number of Taps Terminated Tap Unterminated Tap 18 140 ft 43 m 77 ft 23 5 m 19 148 ft 45 m...

Страница 32: ...ting the Distance to a Short Depending on the type of short on a cable the MediaChecker may or may not be able to determine the distance to the short If the MediaChecker cannot report the distance you...

Страница 33: ...tolerance will add some degree of error to the calculation Important When testing Ethernet cable the MediaChecker can report the distance to all the shorts described above because additional test data...

Страница 34: ...00575 m DeviceNet Thin 0 028 ft 0 0918 m 0 01617 ft 0 053 m 0 0032 ft 0 0105 m DeviceNet KwikLink 0 00404 ft 0 01325 m 0 00404 ft 0 01325 m NA DH RIO 0 00944 ft 0 031 m NA 0 0041 ft 0 0135 m Table 14...

Страница 35: ...ress A 2 Press E to step through the selections 3 Press C or D to select the desired setup condition 4 Press A to exit the setup mode or press E to move to the next setup selection Setup selections th...

Страница 36: ...e 50 hours of operation Using the backlight may significantly reduce battery life Figure 5 shows how to replace the batteries Determining the Software Version The version number of your MediaChecker s...

Страница 37: ...cker for repair See Returning the MediaChecker for Repair on page 39 Problem appears to be a MediaChecker malfunction Symptom 2 The MediaChecker seems to be measuring incorrectly Self test fails Inter...

Страница 38: ...EST is displayed 3 Press C or D to select YES Important To exit without performing a self test either press A or ensure that the second line is displaying NO and press E to move to the next setup sele...

Страница 39: ...l Automation for repair To check the MediaChecker s coaxial cable functions run the TEST and LENGTH tests on a known length of cable Returning the MediaChecker for Repair If after performing the previ...

Страница 40: ...ge 957259 13 Quick reference card 957259 93 1788 MCHKR Accessory Kit 1 RJ 45F to DB9 male adapter 1 RJ 45 to RJ 45 straight through patch cable 2 Male DB9 to male 3 pin Phoenix adapters 2 Male DB9 to...

Страница 41: ...otection Will withstand connection to any of the supported networks in a live condition with a supply voltage not exceeding 25 V ACTIVE CABLE is displayed and an audible signal sounds when the MediaCh...

Страница 42: ...to 999 ft long 305 m 10 ft for cables 999 ft long Table 19 DeviceNet Cable Test Specifications Cable Length Distance to Short Cable 1 Range 2 Accuracy Resolution Accuracy 2 Resolution 3 DeviceNet Thic...

Страница 43: ...g 1 ft 0 5 m for cables to 999 ft long 305 m 10 ft 3 m for cables 999 ft long 3 For the data pair only Table 21 Ethernet Cable Test Specifications Test Range Accuracy Resolution 2 Cable length 7 0 5 m...

Страница 44: ...dity 10 C to 30 C 95 5 RH without condensation 30 C to 40 C 75 5 RH without condensation 40 C to 45 C 45 5 RH without condensation Altitude Non operating 0 km to 12 km 40 000 ft Operating 0 km to 4 57...

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