Vanguard CT-7500 S2 User Manual
TM
CT-7500 S2
DIGITAL CIRCUIT BREAKER ANALYZER
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-9390
FAX: (909) 923-9391
February 2011
Revision 2
CT-7500 S2 USER’S MANUAL REV 2
SAFETY SUMMARY
FOLLOW EXACT OPERATING PROCEDURES
Any deviation from the procedures described in this User’s Manual may create one or more
safety hazards, may damage the CT-7500 S2, or cause errors in the test results. Vanguard
Instruments Company, Inc. assumes no liability for unsafe or improper use of the CT-7500 S2.
All safety precautions provided in this manual must be observed during all phases of testing
including test preparation, test lead connection, actual testing, and test lead disconnection.
SAFETY WARNINGS AND CAUTIONS
Only trained operators shall use the CT-7500 S2. All devices under test shall be off-line and fully
isolated. Do not perform test procedures or service unless another person is also present who
is capable of rendering aid and resuscitation.
DO NOT MODIFY TEST EQUIPMENT
To avoid the risk of introducing additional or unknown hazards, do not install substitute parts or
perform any unauthorized modification to any CT-7500 S2 test unit. To ensure that all designed
safety features are maintained, it is highly recommended that repairs be performed only by
Vanguard Instruments Company factory personnel or by an authorized repair service provider.
Unauthorized modifications can cause safety hazards and will void the manufacturer’s
warranty.
WARNING
Do not remove test leads during a test. Failure to heed this warning can result in electrical
shock to personnel and damage to the equipment.
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TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT ..................................................................................... 1
1.0 INTRODUCTION .................................................................................................................. .. 2
1.1 General Description and Features ................................................................................... 2
1.2 Technical Specifications ................................................................................................... 5
1.3 CT-7500 S2 Controls and Indicators ................................................................................. 6
2.0 PRE-TEST SETUP ................................................................................................................... 8
2.1 Operating Voltages .......................................................................................................... 8
2.2 LCD Screen Contrast Control ............................................................................................ 8
2.3 Printer Paper Control ....................................................................................................... 9
2.4 Printer Paper .................................................................................................................... 9
3.0 OPERATING PROCEDURES ................................................................................................. 10
3.1 Cable Connections ......................................................................................................... 10
3.1.1. Contact Cable Connections .................................................................................... 10
3.1.2. Initiate Cable Connections ..................................................................................... 12
3.1.3. Analog and Digital Voltage Monitoring Connections ............................................. 14
3.1.4. External Trigger Input Connections ........................................................................ 15
3.1.5. Digital Transducer Connection ............................................................................... 16
3.1.6. Resistor Type Transducer Connection .................................................................... 17
3.1.7. On-line Test AC Current Sensor Connection .................................................................. 18
3.1.8. Pre-Test Setup ................................................................................................................ 19
3.1.9. Entering Test Record Header Information ............................................................. 19
3.1.10. Setting the Clock ..................................................................................................... 22
3.1.11. Configuring the Automatic Printing Feature .......................................................... 23
3.1.12. Setting the Units of Measure ................................................................................. 24
3.1.13. Setting the Open Timing Analysis Points ................................................................ 25
3.1.14. Selecting the Contact Cycle Reading Frequency .................................................... 29
3.1.15. Configuring the Channel Settings ........................................................................... 32
3.1.16. Configuring the Contact Filter Settings .................................................................. 34
3.1.17. Configuring the Transducer Encoder Filter Setting ................................................ 36
3.1.18. Configuring the Digital Rotary Transducer Settings ............................................... 38
3.1.19. Configuring the Resister Type Transducer Settings ............................................... 40
3.2 Performing Circuit Breaker Timing Tests ....................................................................... 47
3.2.1. Timing an OPEN Operation ..................................................................................... 48
3.2.2. Timing a CLOSE-OPEN Operation Using Contact Channel #1 ................................. 51
3.2.3. Timing an OPEN-CLOSE-OPEN Operation ............................................................... 54
3.2.4. Running CT-7500 S2’s in Tandem ........................................................................... 58
3.2.5. Printing or Viewing Timing Results ......................................................................... 59
3.3 Working with Test Records ............................................................................................ 69
3.3.1. Saving a Timing Record in Flash EEPROM .............................................................. 69
3.3.2. Printing a Test Record Directory ............................................................................ 70
3.3.3. Recalling a Test Record from the Flash EEPROM ................................................... 72
3.3.4. Deleting Test Records from the Flash EEPROM ..................................................... 74
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3.4 Working With Test Plans ................................................................................................ 77
3.4.1. Recalling a Breaker Test Plan for Use ..................................................................... 77
3.4.2. Printing a Directory of Test Plans Stored in the CT-7500 S2’s Memory ................. 80
3.4.3. Printing a Breaker Test Plan ................................................................................... 82
4.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING ................................................. 86
4.1 Performing a Slow-Close Test ........................................................................................ 86
4.2 Performing a Transducer Self-Test ................................................................................ 88
4.3 Testing the Cable Hookups ............................................................................................ 89
4.4 Printing Raw Test Record Data ...................................................................................... 90
4.5 Troubleshooting Guide .................................................................................................. 92
5.0 APPENDICES ....................................................................................................................... 94
5.1 APPENDIX A – ITE Model 14.4K Circuit Breaker Timing Charts and Reports ................. 94
5.2 APPENDIX B – Siemens TCP Breaker Velocity Calculation ............................................. 99
5.3 APPENDIX C – Siemens SPS2 Breaker Velocity Calculation ......................................... 100
5.4 APPENDIX D – CT-7500 S2 Test Plan for Siemens SPS2 ............................................... 101
5.5 APPENDIX E – CT-7500 S2 Transducer Illustrations ..................................................... 102
LIST OF TABLES
Table 1. CT-7500 S2 Technical Specifications ................................................................................. 5
Table 2. Functional Descriptions of CT-7500 S2 Controls and Indicators ....................................... 7
Table 3. Descriptions of Tabulated Test Results Elements ........................................................... 62
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LIST OF FIGURES
Figure 1. CT-7500 S2 Controls and Indicators ................................................................................. 6
Figure 2. CT-7500 S2 Operating Voltage Setting Switch ................................................................. 8
Figure 3. Typical 3-Phase Circuit Breaker Connections ................................................................ 10
Figure 4. Typical Connections for Series Contact Circuit Breaker ................................................ 11
Figure 5. Typical DC Trip and DC Close Control Circuit Connection ............................................. 12
Figure 6. Typical DC Trip and AC Close Control Circuit Connection .............................................. 13
Figure 7. Typical Analog and Digital Voltage Monitoring Connections ........................................ 14
Figure 8. Typical External Trigger Input Cable Connections ......................................................... 15
Figure 9. Typical Digital Transducer Connection .......................................................................... 16
Figure 10. Typical Resistor Type Transducer Connection ............................................................. 17
Figure 11. AC Current Sensor Connection .................................................................................... 18
Figure 12. Typical 50 Hz Tabulated Test Results ........................................................................... 31
Figure 13. Typical 60 Hz Tabulated Test Results ........................................................................... 31
Figure 14. Contact Filter Setting Illustrations ............................................................................... 35
Figure 15. Sample Resistor Type Transducer Setup Directory ..................................................... 45
Figure 16. Sample Timing Report Using a Resistor Type Transducer ........................................... 46
Figure 17. Typical O-C-O Test Results Graph ................................................................................ 56
Figure 18. Typical Tabulated Test Results Printout for an O-C-O Operation ................................ 57
Figure 19. Typical Initiate and Trigger Connections for Operating Two CT-7500 S2's in Tandem 58
Figure 20. Typical Tabulated Test Results Printout for a CLOSE Operation ................................. 61
Figure 21. Typical Test Results Graph (CB CLOSE Test) ................................................................ 63
Figure 22. Expansion Graph from 0ms to 300ms (CB CLOSE Test) ............................................... 64
Figure 23. Typical O-C-O Test Results Graph ................................................................................ 65
Figure 24. Typical Tabulated Test Results Printout for an O-C-O Operation ................................ 66
Figure 25. Graphical Interpretation of an OPEN Timing Shot ....................................................... 67
Figure 26. Graphical Interpretation of a CLOSE Timing Shot ........................................................ 67
Figure 27. Graphical Interpretations of an OPEN-CLOSE and CLOSE-OPEN Timing Shot ............. 68
Figure 28. Sample Test Record Directory Printout ....................................................................... 71
Figure 29. Typical Test Results Printout with Pass/Fail Indicators ............................................... 79
Figure 30. Typical Test Plan Directory Printout ............................................................................ 81
Figure 31. Typical Breaker Test Plan Printout ............................................................................... 83
Figure 32. Siemens SPS2 121 CLOSE Timing Illustration ............................................................... 84
Figure 33. Siemens SPS2 121 OPEN Timing Illustration ................................................................ 85
Figure 34. Typical Slow-Close Test Results Printout ..................................................................... 87
Figure 35. Partial Data Points Printout ......................................................................................... 91
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CONVENTIONS USED IN THIS DOCUMENT
This document uses the following conventions:
• A key or switch on the CT-7500 S2 is indicated as [KEY] and [SWITCH].
Menu options are referenced as (MENU OPTION).
•
Screen and menu names are referenced as “SCREEN/MENU NAME”.
•
The terms “test record” and “test shot” are used interchangeably.
•
• CT-7500 S2 LCD screen output is shown as:
1. OPTION 1
2. OPTION 2
3. OPTION 3
4. OPTION 4
• When instructions are provided, the menu item that should be selected is shown in bold as
shown below (option 3 should be selected):
1. OPTION 1
2. OPTION 2
3. OPTION 3
4. OPTION 4
• Warning messages are indicated as:
Warning message
WARNING
• Important notes are indicated as:
Note details
NOTE
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1.0 INTRODUCTION
1.1 General Description and Features
The CT-7500 S2 is an easy to use, stand-alone, microprocessor-driven EHV circuit-breaker
analyzer. It can operate either in Time-Travel analyzer mode or in Quick-Shot mode (for on-line
timing). In Time-Travel mode, the CT-7500 S2 can fully analyze a circuit-breaker’s performance
by testing the contact time, stroke, velocity, over-travel, and contact wipe. Contact-motion
analysis can be performed for all breaker contact operations (Open, Close, Open – Close, Close
– Open, and Open – Close – Open). The CT-7500 S2’s timing window is selectable between 1second, 10-second, or 20-second periods. The 10-second and 20-second timing windows are
ideal for timing long duration events such as circuit-switcher contact testing.
Quick-Shot Mode
In Quick-Shot mode, the CT-7500 S2 captures the breaker’s trip or close time, the trip/close-coil
current “fingerprint,” and the battery supply voltage while the breaker is still in service. The
trip/close time is derived from the time of trip, or close-coil initiation, to the breaker’s bushing
current-break-or-make as detected by an AC clamp-on current sensing probe.
With a simple connection (see Figure 11), the Quick-Shot mode can detect a breaker’s
operating conditions with little or no down time. In Quick-Shot mode, the first trip operation
time of the breaker is captured. If a breaker has been in service for a long period of time and
sitting in close position, the first trip time of the breaker may be slow possibly due to a sticky
mechanism. The Quick-Shot mode is very useful in such cases because traditional breaker
timing may not detect this condition since several operations may have occurred before the
first timing test is conducted.
Conventional Time-Travel Analysis Mode
The CT-7500 S2 is available in models with either 3 (CT-7500-3 S2), 6 (CT-7500-6 S2), or 12 (CT7500-12 S2) dry-contact inputs. All models feature three digital travel transducer input
channels.
Contact Timing Inputs
Dry-contact input channels are used for timing breaker contacts. Each contact input channel
can detect main contact and insertion-resistor contact times in milliseconds and cycles.
Voltage Monitoring Inputs
One analog voltage input channel, designated as V1, is dedicated to monitoring a circuitbreaker’s DC power supply or coil voltage (0 – 255 volts, DC or peak AC). A second voltage input
channel, designated as V2, is dedicated to detecting the voltage on/off status (presence or
absence) of an A/B switch.
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CT-7500 S2 USER’S MANUAL REV 2
Trip/Close Current Monitoring
A built-in Hall-effect current sensor records the Trip/Close current level and duration. The
breaker’s operate-coil current waveform duration (effectively, a performance "fingerprint" or
"current profile") can be used as a diagnostic tool for analyzing a breaker’s performance.
Breaker Stroke and Velocity
Three digital travel transducer channels are available on the CT-7500 S2 for measuring circuitbreaker velocity, stroke, over-travel, and bounce-back. Unlike other transducer types, the
digital transducer requires neither calibration nor setup. A breaker’s contact-velocity is
calculated based on the contact’s travel distance over a period of time. A special feature is also
available to “slow-close” test a breaker and obtain a test result report.
Resistor Type Transducer Input
One resistor type input channel is also available on the CT-7500 S2. This input channel allows
the unit to measure circuit-breaker motion by directly interfacing with resistive type
transducers. The transducer resistance ranges from 200 ohms to 10K Ohms.
Breaker Initiate Features
A built-in solid-state initiate device is used to operate a breaker from the CT-7500 S2. The
operational modes include Open, Close, Open – Close, Close – Open, and Open – Close – Open.
Multiple operations, such as Open – Close and Open – Close – Open, can be initiated by using
programmable delay time or by sensing a breaker’s contact condition.
Internal Test Record Storage
The CT-7500 S2 can store up to 150 test records in Flash EEPROM. Test records can be retrieved
and printed on the built-in thermal printer, or they can be transferred to a PC via the unit’s RS232C or USB interface.
Internal Breaker Test Plan Storage
The CT-7500 S2 can store up to 99 circuit-breaker test plans. Test plans are comprised of all
circuit-breaker performance specifications (stroke, velocity, and contact time). A test plan can
be used to immediately test a circuit-breaker. A pass/fail report is then generated by comparing
actual performance with the specifications in the stored test plan. Test plans can also be
generated on a PC and transferred to the CT-7500 S2 via the unit’s RS-232C or USB interface.
Computer Interface
The CT-7500 S2 can be computer-controlled via its RS-232C or USB interface. A Windows®
XP/Vista-based Breaker-Analysis software application is provided with each unit. Using this
software, circuit-breakers can be timed from the PC. Test records can be retrieved from the CT7500 S2 and then stored on the PC for future analysis and report generation. Circuit-breaker
test plans can also be created on the PC and transferred to the CT-7500 S2. Additionally, test
records can be exported in Microsoft® Excel format for further analysis.
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Diagnostic Capabilities
The CT-7500 S2 can perform diagnostics on its internal electronics. Diagnostics can be
performed to verify contact cable connections and to test the travel transducer’s electronics.
User Interface
The CT-7500 S2 features a back-lit LCD screen (20 characters by 4 lines) that is viewable in both
bright sunlight and low-light levels. A rugged, 16-key, membrane keypad is used to control the
unit.
Built-in Thermal Printer
The CT-7500 S2’s built-in 4.5-inch wide thermal printer can print the breaker contact analysis
results in both tabular and graphic formats.
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1.2 Technical Specifications
Table 1. CT-7500 S2 Technical Specifications
TYPE Portable circuit-breaker analyzer
PHYSICAL SPECIFICATIONS 16”W x 11”H x 14”D (40.6 cm x 29.9 cm x 35.6 cm); Weight: less than 25 lbs (11.3 kg)
INPUT POWER 100 – 120 Vac or 200 – 240 Vac (selectable), 50/60Hz
DRY-CONTACT INPUTS 3, 6 or 12 dry-input channels (depending on model). Each channel detects main and
TIMING WINDOWS 1-second, 10-seconds, or 20-seconds
TIMING RESOLUTIONS ±50 micro-seconds @ 1-second duration,
TIMING ACCURACY 0.05% of reading ±0.05 ms @ 1-second duration
DRY-CONTACT CHANNEL
PROTECTION
DRY-CONTACT DETECTION
RANGE
RESISTOR DETECTION RANGE 50 – 5,000 ohms
CT CURRENT SENSOR One, non-contact, 0 – 100 Amperes
TRIGGER INPUT VOLTAGE Open/Close: 30 – 300V, DC or peak AC
VOLTAGE SENSING INPUT
RANGE
BREAKER OPERATIONS Initiate Open, Close, Open– Close, Close – Open, Open – Close – Open
BREAKER INITIATE CAPACITY 30A, 250Vac/dc max
INITIATE CURRENT READING
RANGE
DIGITAL TRAVEL TRANSDUCER
INPUTS
RESISTOR TYPE TRANSDUCER
INPUT
CONTACT TRAVEL POINT
DIFFERENCE
DISPLAY Back-lit LCD Screen (20 characters by 4 lines); viewable in bright sunlight and low-light
PRINTER Built-in 4.5-inch wide thermal printer can print both graphic contact travel waveforms
INTERNAL TEST RECORD
STORAGE
COMPUTER INTERFACES One RS-232C port, One USB port
PC SOFTWARE Windows® XP/Vista-based Breaker-Analysis software is included with purchase price
SAFETY Designed to meet UL 6101A-1 and CAN/CSA C22.2 No 1010.1-92 standards
ENVIRONMENT Operating: -10°C to 50°C (+15°F to +122°F); Storage: -30°C to70°C (-22°F to +158°F)
HUMIDITY (MAX) 90% RH @ 40˚ C (104˚ F) non-condensing
ALTITUDE (MAX) 2000m (6562 ft) to fully safety specifications
OPTIONS Transportation case (available for the CT-7500 S2 and the travel transducers)
WARRANTY One year on parts and labor
insertion-resistor contacts
±500 micro-seconds @ 10-second duration,
±1.0 milli-seconds @ 20-second duration
All contact inputs are grounded until test; input channels are protected against static
discharge
Closed: less than 20 ohms;
Open: greater than 5,000 ohms
V1: analog input; 0 – 255V DC or peak AC; Sensitivity ±1V
V2: voltage presence/absence detector input; 30 – 300V DC or peak AC
One, non-contact, Hall-effect sensor, 0 – 20 amp range, dc to 5Khz
3 digital travel transducer channels; Linear range, 0.0 – 60.0 in (±0.01 in); Rotary
range: 0 – 360 degrees (±0.36 degrees)
200 Ohms – 10K Ohms
Measures “slow-close” contact-point distances; results can be printed
levels
and tabulated test results
Stores up to 150 test records and 99 test plans
CT-7500 S2 USER’S MANUAL REV 2
The above specifications are valid at nominal operating voltage and at a
temperature of 25°C (77°F). Specifications may change without prior notice.
NOTE
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1.3 CT-7500 S2 Controls and Indicators
The CT-7500 S2’s controls and indicators are shown in Figure 1 below. A leader line with an
index number points to each control and indicator, which is cross-referenced to a functional
description in Table 2. The table describes the function of each item on the control panel. The
purpose of the controls and indicators may seem obvious, but users should become familiar
with them before using the CT-7500 S2. Accidental misuse of the controls will usually cause no
serious harm. Users should also be familiar with the safety summary found on the front page of
this User’s Manual.
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Figure 1. CT-7500 S2 Controls and Indicators
CT-7500 S2 USER’S MANUAL REV 2
Table 2. Functional Descriptions of CT-7500 S2 Controls and Indicators
Item
Number
1
2
3
4
5
6
7
8, 9, 10
11
12
13
14
15
16
17
18
19
20
Panel Markings Functional Description
CONTACT INPUT
(C1-C12)
0-300V
V1
0-300V
V2
0-300V
TRIGGER
CT CT input channel. Detects CB loa d current for Quick-Shot application.
100-120 Vac, 8A,
50-60Hz
GROUND Safety ground terminal.
D1, D2, D3
TRANSDUCER
INPUT
R1 5-pin connector. Resistor type transducer input.
INITIATE 4-pin connector used for the switching circuit for op era ting the circuit breaker
OPEN
250V,
5A FAST-BLOW
CLOSE
250V,
5A FAST-BLOW
Built-in 4.5-inch wide thermal printer.
“PUSH” TO ARM Spring-loaded pushbutton switch. Press and hold to co mpl ete the Trip or Close
Rugged alpha-numeric membrane keypad.
Back-lit LCD screen (20 characters by 4 lines); viewable in bright sunlight and
RS-232C RS-232C serial computer interface port.
USB USB computer interface port.
Female connectors for the contact channels. The CT-7500-12 S2 is pictured
with 12 channels.
3-pin connector. V1 voltage input channel is dedica ted to mon i toring circui t
breaker DC power supply o r co il voltages. Voltage sensing range is from 0-255
volts, dc or pe ak ac.
3-pin connector. V2 voltage input channel is dedicated to detecting voltage
on/off status (present or absent) of an A/B switch. Voltage input ranges from
0-300 volts, dc or peak ac.
3-pin connector. Triggers voltage input for external trigger application. Voltage
levels ranging from 30 to 300 V, dc or peak ac.
Power plug and power switch. Built-in 12 Ampe re circuit breaker.
16-pin connectors. Digital travel transducer input channels.
under test.
Open circuit fuse: 5 Ampere, 250V, Fast-Blow.
Close circuit fuse: 5 Ampere, 250V, Fast-Blow.
circuits for breaker tests.
low-light levels.
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2.0 PRE-TEST SETUP
2.1 Operating Voltages
The CT-7500 S2’s operating voltage is selectable between 110-120 Vac, 50/60 Hz and 220-240
Vac, 50/60 Hz. In older production models of the CT-7500 S2, the operating voltage is set by the
voltage selection switch as shown in Figure 2. To change the voltage setting, remove the CT7500 S2 from its enclosure, locate the voltage setting switch on the right side of the unit, and
set the new operating voltage. Newer production models of the CT-7500 S2 can auto-sense the
voltage and do not have a voltage selection switch.
Figure 2. CT-7500 S2 Operating Voltage Setting Switch
2.2 LCD Screen Contrast Control
To increase the LCD screen contrast, press and hold the
[PAPER ∧ Contrast] key for two
seconds. Release the button when the desired contrast level has been reached.
To decrease the LCD screen contrast, press and hold the [PAPER ∨ Contrast] key for two
seconds. Release the button when the desired contrast level has been reached.
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CT-7500 S2 USER’S MANUAL REV 2
2.3 Printer Paper Control
To advance the thermal printer paper, press and release the [PAPER ∧ Contrast] key.
To retract the thermal printer paper, press and release the [PAPER ∨ Contrast] key.
2.4 Printer Paper
The CT-7500 S2’s built-in thermal printer uses 4.5-inch wide thermal paper for printing test
results. To maintain the highest print quality and to avoid paper jams, the use of thermal paper
supplied by Vanguard Instruments Company is highly recommended. Additional paper can be
ordered from the following sources:
Vanguard Instruments Co, Inc.
1520 S. Hellman Avenue
Ontario, CA 91761
Tel: 909-923-9390
Fax: 909-923-9391
Part Number: VIC TP-4 paper
BG Instrument Co.
13607 E. Trent Avenue
Spokane, WA 99216
Tel: 509-893-9881
Fax: 509-893-9803
Part Number: VIC TP-4 paper
2.5 Replacing the Thermal Printer Paper
The roll of thermal paper is housed inside a dispenser underneath the printer cover. To replace
the paper, follow the steps below:
• Unscrew the two large printer cover screws and remove the printer cover.
• Remove the leftover thermal paper roll from the paper holder.
• Unroll the new thermal paper roll.
• Feed the thermal paper into the slot between the paper pocket and the rubber roller.
The printer will automatically pull the paper under the thermal head.
• Place the paper roll into the paper holder.
• Lift the thermal head and align the thermal paper if necessary.
• Re-install the printer cover.
Thermal paper has a chemical coating on one side of the paper. This side should be
facing the thermal print head. Incorrect paper loading may result in blank output on
NOTE
the thermal paper.
The thermal paper will show a red stripe to indicate that the roll is about to run out
of paper.
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3.0 OPERATING PROCEDURES
3.1 Cable Connections
3.1.1. Contact Cable Connections
A typical contact cable connection to a circuit breaker is shown in Figure 3. Red and black clips
are connected across the circuit contact phases A, B, and C. A typical circuit breaker with series
contacts is shown in Figure 4.
It is advisable to ground one side of the contacts for most testing purposes. If a
breaker is floating or un-grounded, ensure that the contact channel inputs are
NOTE
protected against static discharge.
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Figure 3. Typical 3-Phase Circuit Breaker Connections
CT-7500 S2 USER’S MANUAL REV 2
Figure 4. Typical Connections for Series Contact Circuit Breaker
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3.1.2. Initiate Cable Connections
The CT-7500 S2 can trip or close breakers through a solid-state device operating on any AC or
DC control voltage ranging from 10 to 300 Volts. Both the trip and close circuits are protected
by 5 Ampere fuses. A typical DC trip and DC close control circuit connection is shown in Figure
5. A typical DC trip and AC close control circuit connection is shown in Figure 6.
Figure 5. Typical DC Trip and DC Close Control Circuit Connection
Auxiliary switches, in series with the OPEN and CLOSE coil control circuit, are used to
interrupt the coil current.
NOTE
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CT-7500 S2 USER’S MANUAL REV 2
Figure 6. Typical DC Trip and AC Close Control Circuit Connection
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3.1.3. Analog and Digital Vo ltage Monitoring Connections
The analog voltage input “V1” can monitor a breaker’s DC control voltage during an operation.
The analog voltage input records the nominal DC voltage at no load and the minimum DC
voltage while the Trip or Close coil is energized. The nominal and minimal voltage readings are
printed on a tabulated report, and the analog waveforms are plotted in graphical format. This
allows the user to see the breaker’s DC control voltage “dip” under load conditions and helps
detect problems such as a poor connection or an excessive voltage drop during operation.
Please note that the maximum voltage that can be recorded is 255 Vdc.
The digital voltage input channel “V2” can monitor the voltage status as “ON” or “OFF” states.
The voltage “ON” or “OFF” states are plotted on the graphical report. Typical analog (“V1”) and
digital (“V2”) voltage monitoring connections are shown in Figure 7.
Figure 7. Typical Analog and Digital Voltage Monitoring Connections
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CT-7500 S2 USER’S MANUAL REV 2
3.1.4. External Trigger Input Connections
The External Trigger Mode can be used to start recording data when the CT-7500 S2 senses a
voltage. A typical application for the External Trigger Mode is to time a circuit breaker in a Close
operation and to start timing only when the Close coil is energized, thus bypassing the 52X relay
delay time.
Since the 52X relay carries the Close coil current, the CT-7500 S2’s initiate cable must be
connected to the Close terminal as shown in Figure 5. The CT-7500 S2 will energize the 52X
relay to start the Close operation, which will then start the timing when the CT-7500 S2 senses
the voltage across the closing coil. Typical external trigger input connections are shown in
Figure 8.
Another application for the External Trigger is to start timing the breaker when the user trips or
closes the breaker remotely.
• The minimum trigger voltage is 30 Vac/dc. Maximum, continuous voltage is limited
to 300 Vac/dc. Different trigger voltages can be set at the factory by request.
NOTES
• The CT-7500 S2 will start looking for the external trigger voltage when the message
“AWAITING TRIGGER…” is displayed on the LCD screen. The external trigger
voltage must be sensed by the CT-7500 S2 within 15 seconds after the initiate
sequence has begun. The CT-7500 S2 will return to the “START-UP” menu if no
voltage is sensed.
Figure 8. Typical External Trigger Input Cable Connections
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3.1.5. Digital Transducer Connection
A typical digital transducer connection is shown in Figure 9.
Figure 9. Typical Digital Transducer Connection
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CT-7500 S2 USER’S MANUAL REV 2
3.1.6. Resistor Type Transducer Connection
The CT-7500 S2 provides one channel for resistor type transducers. The transducer resistance
input can range from 200 Ohms to 10K Ohms. The CT-7500 S2 supplies a 5 Vdc reference
voltage to power the resistor type transducer. The sense voltage is translated into a travel
distance based on the transducer calibration parameters. The user is required to setup the
resistor transducer before performing a test. Up to nine transducer setups can be stored in the
CT-7500 S2’s internal memory. Once a transducer setup is stored, it can be recalled quickly
before running a test. A typical resistor type transducer connection is shown in Figure 10.
• When a resistor type transducer is used, the test results are shown as travel
transducer channel 1 (see Figure 16).
NOTES
• A 15-foot transducer cable with 3 quick disconnect clips is provided with each CT-
7500 S2. The 3 clips are labeled “+5V”, “Signal”, and “GND”.
• See section 3.1.19 for resistor type transducer calibration information.
Figure 10. Typical Resistor Type Transducer Connection
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REV 2 CT-7500 S2 USER’S MANUAL
3.1.7. On-line Test AC Current Sensor Connection
A typical CT-7500 S2 AC current sensor connection is shown in Figure 11. The non-contact AC
current sensor must be connected to one of the circuit breaker bushing CT terminals. A
minimum current of 100 mA is required for the CT-7500 S2 AC current sensor.
Figure 11. AC Current Sensor Connection
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CT-7500 S2 USER’S MANUAL REV 2
3.1.8. Pre-Test Setup
3.1.9. Entering Test Record Header Information
You can enter the test record header information before performing tests. The record header
includes identifying information such as the company, station, circuit, model number, etc. Once
the header information has been entered, it will apply to all subsequent test records. To enter
the header information:
a. When the unit is turned on and the firmware is loaded, you will be presented with the
“START-UP” menu as shown below:
1. TIME BRKR 02/17/11
2. GET RSLT 14:15:16
3. SETUP
4. DIAGNOSTICS
Press the [3] key (SETUP).
b. The following screen will be displayed:
1. ANALYSIS POINTS
2. MEASUREMENT UNITS
3. SAVE / RESTORE
4. NEXT PAGE
Press the [4] key (NEXT PAGE).
c. The following screen will be displayed:
1. SHOT DESCRIPTION
2. NUMBER OF CHANNELS
3. SET DATE & TIME
4. NEXT PAGE
Press the [1] key (SHOT DESCRIPTION).
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REV 2 CT-7500 S2 USER’S MANUAL
d. The following screen will be displayed:
COMPANY:
↑↓ TO POSITION
“ENTER” TO ACCEPT
Type the company name using the alpha-numeric keypad.
When pressing a key, the corresponding number on the key will be displayed first.
Pressing the key again will display the first letter on the key. Pressing the key again will
display the second letter on the key. For example, to type the letter “A”, you must press
[2] key twice. To erase the character at the cursor position, press the [CLEAR] key.
the
Press the
∨ Contrast]
[PAPER ∧ Contrast] key to move to the next character. Press the [PAPER
key to move to the previous character. Press the [ENTER] key when you
are done typing the company name.
e. The following screen will be displayed:
STATION:
↑↓ TO POSITION
“ENTER” TO ACCEPT
Type the station name using the alpha-numeric keypad and then press the [ENTER]
key.
f. The following screen will be displayed:
CIRCUIT:
↑↓ TO POSITION
“ENTER” TO ACCEPT
Type the circuit information using the alpha-numeric keypad and then press the
[ENTER] key.
g. The following screen will be displayed:
MANUFACTURER:
↑↓ TO POSITION
“ENTER” TO ACCEPT
Type the manufacturer name using the alpha-numeric keypad and then press the
[ENTER] key.
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h. The following screen will be displayed:
MODEL:
↑↓ TO POSITION
“ENTER” TO ACCEPT
Type the model information using the alpha-numeric keypad and then press the
[ENTER] key.
i. The following screen will be displayed:
SERIAL NUMBER:
↑↓ TO POSITION
“ENTER” TO ACCEPT
Type the serial number using the alpha-numeric keypad and then press the [ENTER]
key.
j. The following screen will be displayed:
CT-7500 S2 USER’S MANUAL REV 2
OPERATOR:
↑↓ TO POSITION
“ENTER” TO ACCEPT
Type the operator’s name using the alpha-numeric keypad and then press the [ENTER]
key. All header information will be saved, and you will be returned to the “START-UP”
menu.
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REV 2 CT-7500 S2 USER’S MANUAL
3.1.10. Setting the Clock
Follow the steps below to set the CT-7500 S2’s internal clock:
a. Start from the “START-UP” menu:
1. TIME BRKR 02/17/11
2. GET RSLT 15:05:15
3. SETUP
4. DIAGNOSTICS
Press the [3] key (SETUP).
b. The following screen will be displayed:
1. ANALYSIS POINTS
2. MEASUREMENT UNITS
3. SAVE / RESTORE
4. NEXT PAGE
Press the [4] key (NEXT PAGE).
c. The following screen will be displayed:
1. SHOT DESCRIPTION
2. NUMBER OF CHANNELS
3. SET DATE & TIME
4. NEXT PAGE
Press the [3] key (SET DATE & TIME).
d. The following screen will be displayed:
ENTER
MM-DD-YY HH:MM:SS
Enter the month, date, time, hours, minutes, and seconds (in 24-hour format) using the
alpha-numeric keypad. When the last digit is entered, the clock will be set and you will
be returned to the “START-UP” menu.
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CT-7500 S2 USER’S MANUAL REV 2
3.1.11. Configuring the Automatic Printing Feature
The CT-7500 S2 can be configured to print graphs and tabulated results automatically after each
test. To configure the automatic printing feature:
a. Start from the “START-UP” menu:
1. TIME BRKR 02/17/11
2. GET RSLT 14:16:11
3. SETUP
4. DIAGNOSTICS
Press the [3] key (SETUP).
b. The following screen will be displayed:
1. ANALYSIS POINTS
2. MEASUREMENT UNITS
3. SAVE / RESTORE
4. NEXT PAGE
Press the [4] key (NEXT PAGE).
c. The following screen will be displayed:
1. SHOT DESCRIPTION
2. NUMBER OF CHANNELS
3. SET DATE & TIME
4. NEXT PAGE
Press the [4] key (NEXT PAGE).
d. The following screen will be displayed:
1. SET PRINT MODE
2. SET 50/60 Hz
Press the
[1] key (SET PRINT MODE).
e. The following screen will be displayed:
SET PRINT MODE:
1. AUTOMATIC PRINT
2. BY REQUEST ONLY
Press the
[1] key (AUTOMATIC PRINT) if you would like to automatically print tabulated
and graphic results after each test is performed.
Press the [2] key (BY REQUEST ONLY) to turn off automatic printing of test results.
Please see section 3.2.5 for instructions on how to manually print test results.
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REV 2 CT-7500 S2 USER’S MANUAL
3.1.12. Setting the Units of Measure
The CT-7500 S2 supports and displays both English and Metric calculations. You can switch
between the English and Metric systems using the steps below:
a. Start from the “START-UP” menu:
1. TIME BRKR 02/17/11
2. GET RSLT 13:08:25
3. SETUP
4. DIAGNOSTICS
Press the [3] key (SETUP).
b. The following screen will be displayed:
1. ANALYSIS POINTS
2. MEASUREMENT UNITS
3. SAVE / RESTORE
4. NEXT PAGE
Press the [2] key (MEASUREMENT UNITS).
c. The following screen will be displayed:
SELECT UNITS:
1. ENGLISH
2. METRIC
3. ROTARY ENCODER
Press the [1] key (ENGLISH) or the [2] key (METRIC) to select the corresponding
measurement system. The measurement system will be set and you will be returned to
the “START-UP” menu.
If the measurement system is changed, any relevant values in the working
memory will be automatically converted to the new system. Also, if retrieving
NOTE
a test record from the Flash EEPROM, all data will be converted to the new
measurement system. There is no need to re-run a test.
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CT-7500 S2 USER’S MANUAL REV 2
3.1.13. Setting the Open Timing Analysis Points
Two analysis points are used to calculate the velocity of the circuit breaker in the open
operation. To configure the OPEN timing analysis points:
a. Start from the “START-UP” menu:
1. TIME BRKR 02/17/11
2. GET RSLT 09:04:05
3. SETUP
4. DIAGNOSTICS
Press the [3] key (SETUP).
b. The following screen will be displayed:
1. ANALYSIS POINTS
2. MEASUREMENT UNITS
3. SAVE / RESTORE
4. NEXT PAGE
Press the [1] key (ANALYSIS POINTS).
c. The following screen will be displayed:
1. OPEN TIMING
2. CLOSE TIMING
3. PRINT SETTINGS
4. TEST PLANS
Press the [1] key (OPEN TIMING).
d. The following screen will be displayed:
OPEN ANALYSIS PT 1
1. PERCENT OF STROKE
2. DIST FROM CLOSE
3. CONTACT #1
1. PERCENT OF STROKE
Press the [1] key (PERCENT OF STROKE) to set the open analysis point #1 as a
percentage of the total stroke value.
Percentage of stroke is the distance based upon the percentage of the total
breaker’s stroke distance. The distance is always measured from the starting
NOTE
point at the fully closed position of the breaker contacts.
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