OPERATING INSTRUCTIONS For the Model CT-7500 A Digital Circuit-Breaker Analyzer Manufactured by Vanguard Instruments Co., Inc. 1711 Grevillea Ct.
MODEL CT-7500 OPERATING INSTRUCTIONS TABLE OF CONTENTS 1.0 INTRODUCTION…. ….. ............ ...... ............. ............ ............. ............. ............ ............. …… … 1 2.0 CT-7500 DESCRIPTION ............ ...... ............. ............ ............. ............. ............ ............. .............1 2.1 On-Line Timing (Quick-Shot) Mode .......... ............ ............. ............. ............ ............. .............1 2.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.8 Recall a Breaker Test Plan . ...... ............. ............ ............. ............. ............ ............. .............40 9.9 Print a Breaker Test Plan .... ...... ............. ............ ............. ............. ............ ............. .............41 9.10 Print Breaker Test Plan Directory ........... ............ ............. ............. ............ ............. .............43 9.11 Shot Description .... ............ ...... .............
MODEL CT-7500 OPERATING INSTRUCTIONS LIST OF FIGURES Figure 5-1. CT-7500 Control Panel . ...... ............. ............ ............. ............. ............ ............. ............. ............ 6 Figure 8-1. Typical Circuit-Breaker Test Cable Hookup .... ............. ............. ............ ............. ............. ............ 14 Figure 8-2. Typical Series Contacts Test Cable hookup ... ............. ............. ............ ............. ............. ............ 14 Figure 8-3.
MODEL CT-7500 OPERATING INSTRUCTIONS
MODEL CT-7500 OPERATING INSTRUCTIONS 1.0 Introduction The Model CT-7500 is a microprocessor-based digital time-versus-travel Circuit Breaker Analyzer with a special on line test mode. This on line test mode (Quick-Shot mode) allows the user to capture breaker contact close time and contact open (clear) time while the breaker is still in service.
MODEL CT-7500 OPERATING INSTRUCTIONS or calibrate the transducer. The CT-7500 has a built-in initiate circuit to operate circuit breakers. Since this solid-state circuit is controlled by the micro-processor, the CT-7500 can perform multiple operations (O-C, CO, O-C-O) with ease. Each Trip and Close initiate circuit is fuse protected. The user is also required to hold the “ARM” switch during a test to complete the initiate circuit.
MODEL CT-7500 OPERATING INSTRUCTIONS (e.g., Open-Close, Close-Open, Open-Close-Open) can be initiated with a programmable delay time or by sensing the breaker's contact state. Because solid-state switching is used in the initiate circuitry, the CT-7500 can switch a breaker's ac or dc control circuit. Each trip and close circuit is protected by a 3-ampere fuse. The initiate circuit is also protected by an interlock "ARM" switch. 2.2.7 Built-in Thermal Printer A 4.
MODEL CT-7500 OPERATING INSTRUCTIONS 2.2.13 CT-7500 Display and Control Switches An alpha-numeric keypad lets the user enter breaker’s name plate data (Substation name, Breaker Model, etc) and control function. A 4-line by 20-character LCD readout displays user messages. The LCD is back lighted so messages can be viewed in low light levels. 3.0 Test Result Tabulation 3.
MODEL CT-7500 OPERATING INSTRUCTIONS normally can not be seen using a volt meter. NOTE Voltage reading range is 1.0-255 V dc. 3.4 Digital Voltage Input Results The Digital Voltage Input channel (V2) monitors voltage on/off conditions and graphs the result. A voltage level above 30Vdc is considered as “ON” condition. This input channel is dedicated to monitor breaker’s auxiliary switch action during breaker’s operation. NOTE Input voltage range is 1.0-300 V ac/dc. 3.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 5-1.
MODEL CT-7500 OPERATING INSTRUCTIONS Table 5-1. Model CT-7500 Controls and Displays Fig. 5-1 Index no. PANEL MARKING FUNCTIONAL DESCRIPTION 1 CONTACT INPUT (1-12) Connector, 3-pin: each input is a continuity (dry) sensor for detecting a contact closing or opening (a timing input to the processor). 2 (30V-300V) VOLTAGE V1 & V2/ VOLTAGE INPUT Connector, 3-pin: each input is a voltage detector for timing voltage (30-300 V dc/peak) of trip or close coil switching (active period).
MODEL CT-7500 OPERATING INSTRUCTIONS Table 5-1. Model CT-7500 Controls and Displays (cont’) Fig. 5-1 Index no. PANEL MARKING FUNCTIONAL DESCRIPTION 16 INITIATE Connector, 4-pin; switching circuit for operating the circuit breaker being tested. 17 RS-232C Connector, 9-pin:RS-232C computer interface.
MODEL CT-7500 OPERATING INSTRUCTIONS 6.0 CT-7500 Analyzer Specifications (See table below.
MODEL CT-7500 WARRANTY OPERATING INSTRUCTIONS One year warranty on parts and labor; post-warranty service contracts available 10 Rev 2 Jan 2001
MODEL CT-7500 OPERATING INSTRUCTIONS 7.0 CT-7500 Special Features 7.1 CT-7500 Operating Voltages The CT-7500 operating voltage is selectable between 110/120 V, 50/60 Hz or 220/240 V, 50/60 Hz. Voltage selection is set by one jumper/connector on the Initiate PCB (JP3) and one jumper/connector on the Power Supply PCB (JP1). Jumper setting for both connectors is shown in table 7-1. Table 7-1.
MODEL CT-7500 OPERATING INSTRUCTIONS 7.5 Replacing CT-7500 Thermal Paper The thermal paper roll is residing in the pocket under the printer cover. To replace the thermal paper roll, follow these steps: Remove printer cover. Remove leftover thermal paper roll from paper holder. Unroll new thermal paper roll. Feed thermal paper into the slot between the paper pocket and roller. The printer will pull paper under the thermal head. Roll thermal paper roll and place this paper roll in paper holder.
MODEL CT-7500 OPERATING INSTRUCTIONS 8.0 TEST HOOKUP CONNECTIONS 8.1 Contact Cable Hookup A typical contact cable connection to a circuit breaker is shown in Figure 8-1. NOTE It is advisable to ground one side of the contacts for most testing. If a breaker is floating (i.e., ungrounded), ensure contact-channel inputs are protected against static discharge. A typical series contact connection is shown in Figure 8-2. 8.
MODEL CT-7500 OPERATING INSTRUCTIONS NOTE Minimum trigger voltage is set for 30 V ac/dc. Maximum continous voltage is 300Vac/dc. Different trigger voltages can be set at the factory, based on specific requests from users. The CT-7500 will start looking for the external trigger input voltage after the CT-7500 Initiate Sequence is completed (CT-7500 stops beeping after the user presses “START” key) and message “LOOKING FOR TRIGGER VOLTAGE” is shown on LCD.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 8-1. Typical Single Break Contact Cable Hookup Figure 8-2.
MODEL CT-7500 OPERATING INSTRUCTIONS Firgure 8-3. Typical DC Trip and Close Control Test Cable Hookup Figure 8-4.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 8-5. Typical Voltage-Monitoring Test Cable Hookup Figure 8-6.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 8-7. Transducer Cable Hookup Figure 8-8.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.0 OPERATING PROCEDURES The main steps to time a circuit breaker are listed below (Figure 9-0). Figure 9-1 is a user's "map" of all menus for operating a CT-7500. HOOKUP CT-7500 1. GROUND CT-7500 (See note) 2. CONNECT CT-7500 CABLES TO BREAKER 3. INSTALL TRANSDUCER APPLY POWER 1. TURN CT-7500 POWER ON 2. PERFORM SELF TEST (HOOK-UP TEST, CABLE TEST) TIMER BREAKER 1. SELECT CT-7500 TEST 2. OPERATE BREAKER GET RESULTS 1. GET TABULATED RESULTS 2. GET GRAPHIC RESULTS 3.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-1 CT-7500 Menu Map 20 Rev 2 Jan 2001
MODEL CT-7500 OPERATING INSTRUCTIONS 21 Rev 2 Jan 2001
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-1 CT-7500 Menu Map 22 Rev 2 Jan 2001
MODEL CT-7500 OPERATING INSTRUCTIONS 9.1 Timing A Circuit Breaker Timing Breaker Under Quick-Shot Mode. The CT-7500 will provide OPEN or CLOSE time only under the Quick-Shot mode. The user can have the CT-7500 to initiate the OPEN or CLOSE test, in this case the test report will show OPEN or CLOSE coil current reading and current wave form. If the user operates the breaker for the Quick-Shot test (using External Trigger), no coil current reading or wave form will be recorded.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.1.1 Timing an OPEN Operation With No Insertion Resistor Table 9-1. Open Operation With No Resistor STEP 1 ACTION OPERATION READY TIMER FOR BREAKER OPERATION. PRESS #1 KEY. DISPLAY INSERTION RESISTOR? 1.NO 2.YES 2 SELECT NO INSERTION RESISTOR. PRESS #1 KEY. TIMING WINDOWS: 1.WINDOW = 1 SECOND 2.WINDOW = 10 SECONDS 3 SELECT 1-SECOND WINDOW. PRESS #1 KEY. 1.INTERNAL TRIGGER 2.EXTERNAL TRIGGER 4 SELECT INTERNAL TRIGGER. PRESS #1 KEY. TIMING MODE: 1.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.1.2 Timing an OPEN Operation With Insertion Resistors The CT-7500 can time breakers with insertion resistors. The insertion resistor range is 10 to 7000 ohms. Any insertion resistor more than 7,000 ohms is detected as open circuit. Timing window results will show main contact timing and insertion resistor contact timing. Graphic reports show main contact and resistor contact activities on each of the channels. Table 9-2.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.1.3 Timing CLOSE-OPEN Operation Using Contact Channel #1 The CLOSE-OPEN operation of the breaker simulates a condition where a breaker is closed on a fault. The CT-7500 first initiates a CLOSE command then sends an OPEN command only when it detects that main contact #1 is closed. This mode truly simulates the breaker closing into a fault condition in the field. Table 9-3. Close-Open Operation with No Resistor STEP 1 OPERATION READY TIMER FOR BREAKER OPERATION.
MODEL CT-7500 OPERATING INSTRUCTIONS commands are initiated at the same time. The breaker will start closing, the OPEN circuit is then enabled (by the A/B switch) allowing the OPEN operation. 9.2 Get Tabulated Timing Results Using Thermal Printer Table 9-4. Get Tabulated Results STEP 1 OPERATION GET TIMING RESULTS. ACTION PRESS #1 KEY. DISPLAY 1.PRINT TEST RESULTS 2.PLOT FULL CHART 3.PLOT EXPANSION 4.PLOT 0-200 MS 2 PRINT TABULATED RESULTS. PRESS #1 KEY. SELECT PRINTER 1. INTERNAL THERMAL 2.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-2.
MODEL CT-7500 OPERATING INSTRUCTIONS Note 1. Contact time is shown in both millisecond and cycles. From figure 9-2, contact channel #1 time is 181.50 ms or 10.89 cycles. 2. Contact bounce duration is 1.70 ms 3. Contact wipe is measured as .77 inch. 4. The slowest contact and fastest contact differential time is shown as contact delta:0.10 ms. 5. AC current sensor time is shown as CT Channel Analysis time in millisecond cycles. The CT time is shown as 184.70ms or 11.08 cycles.
MODEL CT-7500 OPERATING INSTRUCTIONS Pass/Fail on Contact Parameters Pass/Fail on Travel Parameters Figure 9-3. Typical tabulated Printout of an Open Operation on Ink-jet Printer.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.3 Get Graphic Timing Results Using Thermal Printer Table 9-5. Plot Chart and Tabulated Report STEP 1 OPERATION GET TIMING RESULTS. ACTION PRESS #2 KEY. DISPLAY 1 PRINT TEST RESULTS 2 PLOT FULL CHART 3 PLOT EXPANSION 4 PLOT 0-200 MS 2 PLOT FULL CHART. PRESS #2 KEY. SELECT PRINTER 1. INTERNAL THERMAL 2. EXTERNAL INKJET 3 PRINT CHART ON THERMAL PAPER. PRESS #1 KEY. PLEASE WAIT PLOTTING GRAPH 4 RETURN TO MAIN MENU AFTER NO ACTION. 1. TIME BRKR 2.
Initiate Current Trace Contact Trace 32 Figure 9-4.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-5.
OPERATING INSTRUCTIONS Analysis Point #2 Analysis Point #1 MODEL CT-7500 Figure 9-6. Expansion Graph from 0ms to 200ms on Thermal Printer Note Analysis point # 1 and point #2 is shown on chart.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-7. Open Timing Shot Graphics Interpretation Figure 9-7A.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-8.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.4 Save Timing Shot in EEPROM Table 9-6. Save Timing Shot In EEPROM STEP 1 OPERATION SELECT SAVE/RECALL MENU. ACTION PRESS #3 KEY. DISPLAY 1 ANALYSIS POINTS 2 MEASUREMENT UNITS 3 SAVE / RESTORE 4 NEXT PAGE 2 SELECT SAVE MENU. PRESS #3 KEY. 1. SAVE SHOT 2. RECALL SHOT 3. SHOT DIRECTORY 4. ERASE SHOT 3 SELECT SAVE SHOT. PRESS #1 KEY. SAVE SHOT # XXXX TEST: CLOSE DATE: MM/DD/YY HH:MM "ENTER" TO CONFIRM 4 5 CONFIRM SAVING SHOT. RETURN TO MAIN MENU.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.5 Print EEPROM Timing Shot Directory Table 9-7. Print Timing Shot Directory STEP 1 OPERATION SELECT SAVE / RESTORE MENU. ACTION DISPLAY PRESS #3 KEY. 1. ANALYSIS POINT 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4. NEXT PAGE 2 SELECT SHOT DIRECTORY MENU. PRESS #3 KEY. 1. SAVE SHOT 2. RESTORE SHOT 3. SHOT DIRECTORY 4. ERASE SHOT 3 SELECT SHORT DIRECTORY. PRESS # 1 KEY. 1. SHORT DIRECTORY 2. FULL DIRECTORY "STOP" TO QUIT 4 PRINT SHOT DIRECTORY NOW.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-9.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.6 Recall a Timing Shot The following steps are used to recall a timing shot stored in EEPROM to working memory. Once a timing shot is recalled, the user can ask for test results from the thermal printer or the color ink-jet printer. Table 9-8. Recall a Timing Shot STEP 1 OPERATION SELECT SETUP MENU. ACTION DISPLAY PRESS #3 KEY. 1. ANALYSIS POINT 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4. NEXT PAGE 2 SELECT SAVE/RESTORE SHOT. PRESS # 3 KEY. 1. SAVE SHOT 2.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.7 Deleting a Timing Shot Users can delete a specific timing shot from the CT-7500 EEPROM memory by using the steps described in the table below. Table 9-9. Delete a Timing Shot STEP 1 OPERATION SELECT SET UP MENU. ACTION PRESS # 3 KEY. DISPLAY 1. ANALYSIS POINTS 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4. NEXT PAGE 2 SELECT SAVE / RESTORE MENU. PRESS # 3 KEY. 1. SAVE SHOT 2. RESTORE SHOT 3. SHOT DIRECTORY 4. ERASE SHOT 3 SELECT ERASE SHOT. PRESS # 4 KEY.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.8 Recall a Breaker Test Plan A breaker test plan contains breaker maximum/minimum operating parameters. A typical list of operating parameters is shown as follows: Max/Min Contact/Resistor Trip Time. Max/Min Contact/Resistor Close Time. Max Contact Spread Time. Max Resistor Contact Spread Time. Max/Min Stroke. Max/Min Trip Velocity. Max/Min Close Velocity. Max/Min Over Travel. Max/Min Bounce Back. Trip Analysis Points. Close Analysis Points.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.9 Print a Breaker Test Plan The user can print a breaker test plan stored in the CT-7500 EEPROM Table 9-11. Print a Breaker Test Plan STEP 1 OPERATION SELECT SET UP MENU. ACTION PRESS # 3 KEY. DISPLAY 1. ANALYSIS POINT 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4. NEXT PAGE 2 SELECT ANALYSIS POINTS. PRESS # 1 KEY. 1. OPEN TIMING 2. CLOSE TIMING 3. PRINT SETTINGS 4. TEST PLAN 3 SELECT TEST PLAN. PRESS # 4 KEY. 1. LOAD TEST PLAN 2. PRINT TEST PLAN 3.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-10.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.10 Print Breaker Test Plan Directory The user can print a breaker test plan directory stored in the CT-7500 EEPROM using the steps in table below: Table 9-12. Print a Breaker Test Plan Directory STEP 1 OPERATION SELECT SET UP MENU. ACTION PRESS # 3 KEY. DISPLAY 1. ANALYSIS POINT 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4. NEXT PAGE 2 SELECT ANALYSIS POINTS. PRESS # 1 KEY. 1. OPEN TIMING 2. CLOSE TIMING 3. PRINT SETTINGS 4. TEST PLAN 3 SELECT TEST PLAN.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.11 Shot Description The CT-7500 lets users enter breaker and test data identification (ID). This data includes the names of the company, station, circuit, and manufacturer, as well as the breaker's model and serial number, and the operator's name. These ID data will print out on the header section of the shot tabulated report. If the user saves the timing shot, this data will also be saved with the timing shot and the time and date.
MODEL CT-7500 OPERATING INSTRUCTIONS Table 9-13. Entering Shot Identification Header (Con’t) STEP 8 9 10 OPERATION ENTER SERIAL NUMBER. ENTER OPERATOR NAME. RETURN TO MAIN MENU. ACTION DISPLAY PRESS # 0-9 KEYS ENTER SERIAL NUMBER PRESS "ENTER" XXXX TO CONFIRM. "ENTER" TO CONFIRM PRESS # 0-9 KEYS ENTER OPERATOR NAME PRESS "ENTER" XXXX TO CONFIRM. "ENTER" TO CONFIRM NO ACTION. 1. TIME BRKR 2. GET RSLT 3. SET UP 4.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.12 CT-7500 Channel Configuration The CT-7500 is available with 3-, 6-, or 12- contact inputs. Under most common timing conditions, the user needs to use only 3 contact timing channels and 1 travel transducer. There is no need to print more than 3 timing channels and 1 transducer channel on the graphic and tabulated report.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.13 Computer Interface Each CT-7500 has an RS-232C port. A Breaker Analysis Software package (provided with the CT-7500) allows an IBM PC to communicate with a CT-7500. This software (operating under Windows 95, Windows 98, Windows Me, Windows 2000, and Windows NT environment) allows users to upload timing shots stored in EEPROM to the IBM PC. From the user's IBM PC, the user can now re-analyze breaker timing shots and output timing report through an office printer.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.14. Breaker Travel Analysis The CT-7500 travel analysis includes breaker stroke, over-travel, bounce-back, and contactwipe distances, and contact velocity calculation. 9.14.1 Breaker Stroke The CT-7500 uses a digital transducer to measure a breaker's contact stroke, over-travel, and bounce-back. The digital transducer output is 200 counts per linear inch of travel; the resolution is accurate to 1/200 inch. The output resolution is ±0.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.14.7 Analysis Point No.1. Three selections are available to the user for setting analysis point No. 1: 1. PERCENTAGE OF STRK 2. DISTANCE FROM CLOSE 3. CONTACT #1 a. Percentage of Stroke: Percentage of stroke is distance based upon percentage of total breaker stroke distance. This distance is always measured from the starting point at the fully closed position of the breaker contacts. b. Distance From Close: Distance from Close range is selectable from 00.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.15 Set-Up Open Analysis Points Table 9-16. Setting Up "OPEN" Analysis Points Using Distance STEP 1 OPERATION SELECT SET UP MENU. ACTION DISPLAY PRESS # 3 KEY. 1. ANALYSIS POINT 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4. NEXT PAGE 2 SELECT ANALYSIS POINT. PRESS # 1 KEY. 1. OPEN TIMING 2. CLOSE TIMING 3. PRINT SETTING 4. TEST PLAN 3 SELECT OPEN ANALYSIS. PRESS # 1 KEY. OPEN ANALYSIS PT 1 1. PERCENT OF STROKE 2. DISTANCE FROM CLOSE 3.
MODEL CT-7500 OPERATING INSTRUCTIONS Table 9-16. Setting Up "OPEN" Analysis Points Using Distance (Con’t) STEP 8 OPERATION ENTER 5 INCHES. ACTION PRESS # 0-9 KEYS. DISPLAY OPEN ANALYSIS PT 2 DISTANCE FROM CLOSE VALUE: 02.00 in "ENTER" TO CONFIRM 9 CONFIRM ENTRY. PRESS "ENTER" 1.TIME BRKR KEY. 2.GET RSLT 3.SET UP 4.DIAGNOSTICS NOTES 1. If an entry is not correct, re-enter digits until display shows desired numbers, then press “ENTER” key. 2. Analysis Point #1 is 1.
MODEL CT-7500 OPERATING INSTRUCTIONS 9-16. English/Metric Selection The CT-7500 supports and displays both English and Metric calculations from the breaker's travel parameters (stroke, velocity, (etc.). The user can switch from one to the other by following the steps in Table 9-17, below: Table 9-17. Select Metric Units of Measure STEP 1 OPERATION SELECT SET UP MENU. ACTION DISPLAY PRESS # 3 KEY. 1. ANALYSIS POINT 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4. NEXT PAGE 2 SELECT MEASUREMENT UNITS.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.17 Set CT-7500 Internal Clock The CT-7500 has an internal clock with a lithium battery. The clock's time and date is displayed on the LCD screen. When a timing shot is stored in EEPROM, time and date are also stored. To set the clock, perform the steps in the following table: Table 9-18. Setting the Clock and Calendar STEP 1 OPERATION SELECT SET UP MENU. ACTION PRESS # 3 KEY. DISPLAY 1. ANALYSIS POINT 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.18 Slow-Close Test The CT-7500 offers a unique feature called a "slow-close" test. This test lets users measure the distance of a breaker's contact travel from fully opened position to contact "touch" position and contact wipe (or penetration) distance. This test requires the operator manually jack the breaker's contact from the fully open position to the fully closed position. Contact channel 1, 2, 3, and transducer channel 1 will be used for this test.
MODEL CT-7500 OPERATING INSTRUCTIONS Figure 9-12. Typical Slow-Close test report 9.19 Transducer Self-Test The users can check transducer electronics by connecting transducer to the CT-7500 and running a “Transducer Self Test”. Table 9-20. Performing a Transducer Self Test STEP 1 OPERATION SELECT DIAGNOSTIC. ACTION PRESS # 4 KEY. DISPLAY 1. SLOW-CLOSE TEST 2. PRINT DATA 3. TEST TRANSDUCER 4. CHECK HOOKUP 2 SELECT TRANSDUCER. PRESS # 3 KEY. TRANSDUCER TEST 1= XXX.XX INCHES 2= XXX.XX INCHES 3= XXX.
MODEL CT-7500 OPERATING INSTRUCTIONS 9.20 Check Cable Hookup Table 9-21. Checking the Cable Hookup STEP 1 OPERATION SELECT DIAGNOSTIC. ACTION DISPLAY PRESS # 4 KEY. 1. SLOW-CLOSE TEST 2. PRINT DATA 3. TEST TRANSDUCER 4. CHECK HOOKUP 2 SELECT CHECK HOOK UP. PRESS # 3 KEY. MAKE SURE BREAKER IS IN CLOSE POSITION, THEN PRESS "START" 3 INITIATE TEST. PRESS "START" KEY. 1234 5 6 C--- - 7 8 9 10 11 12 ---- - - 4 RETURN TO MAIN MENU. PRESS "STOP" KEY. 1. TIME BREAKER 2. GET RESULT 3. SET UP 4.
MODEL CT-7500 OPERATING INSTRUCTIONS 9-21 Automatic Print Setting The CT-7500 can be set to print graph and tabulated results automatically after timing a breaker. To turn on “Auto Print Results” mode, follows steps in table below Table 9-22. Automatic Print Setting STEP 1 OPERATION SELECT SET UP MENU. ACTION PRESS # 3 KEY. DISPLAY 1. ANALYSIS POINT 2. MEASUREMENT UNITS 3. SAVE / RESTORE 4. NEXT PAGE 2 SELECT NEXT PAGE. PRESS # 4 KEY. 1. SHOT DESCRIPTION 2. NUMBER OF CHANNELS 3. COMPUTER IF 4.
MODEL CT-7500 OPERATING INSTRUCTIONS 10.0 Running CT-7500s in Tandem For timing application requiring more than 12 timing contact channels, the user can use two or more CT-7500s to time a circuit breaker. A typical application is to use a CT-7500-12 and a CT7500-6 to time a 18 contact ATB. To time this circuit breaker, the user can use the following steps: Connect the CT-7500-12 to phase A and B of the circuit breaker. Connect the CT-7500-6 to phase C on the circuit breaker.
MODEL CT-7500 OPERATING INSTRUCTIONS 11.0 CT-7500 Trouble Shooting Guide Problems 1. CT-7500 will not trip or close breaker. Suggestion Make sure you hold the “ARM” switch down during test. Check OPEN or CLOSE fuses. Check initiate leads. For a “Positive Trip” circuit, one Close lead and one Open lead should be connected to the Positive of the power supply. 2. No contact time (0 ms) in Trip or Close test. Check initiate leads.
MODEL CT-7500 Problems 9. No “PASS/FAIL” on tabulated report. 10. CT-7500 will not communicate with PC. OPERATING INSTRUCTIONS Suggestion Test plan is not loaded before taking test. You can load test plan then re-print the tabulated report. Make sure CT-7500 is under computer control. Make sure your PC com port is selected correctly. 11. Turn on Automatic Print Results mode. 12. CT-7500 will not print results on external printer. 13. Where can I get some thermal paper? 14.
MODEL CT-7500 OPERATING INSTRUCTIONS APPENDIX A ITE Circuit Breaker model 14.4K Timing Chart. AP1= 1.5” AP2= 3.
MODEL CT-7500 OPERATING INSTRUCTIONS II Rev 2 Jan 2001
MODEL CT-7500 OPERATING INSTRUCTIONS APPENDIX B CT-7500 Test Plan for ITE Circuit Breaker Model 14.4K.
MODEL CT-7500 OPERATING INSTRUCTIONS APPENDIX C CT-7500 Timing Chart for ITE Circuit Breaker Model 14.4K.
MODEL CT-7500 OPERATING INSTRUCTIONS APPENDIX D CT-7500 Tabulated Report for ITE Circuit Breaker Model 14.4K.
MODEL CT-7500 OPERATING INSTRUCTIONS APPENDIX E Timing Chart for Siemens TCP-149 Circuit Breaker. AP1= Contact Point b= Breaker Stroke a= Distance between AP1 & AP2 AP2= Contact - 10ms Note Velocity calculation for this breaker requires a formula: V= 31.
MODEL CT-7500 OPERATING INSTRUCTIONS APPENDIX F CT-7500 Test Plan for Siemens TCP-149 Circuit Breaker. Note Formula to calculate velocity is programmed in breaker test plan.
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