Vanguard CT-7000 User Manual
OPERATING INSTRUCTIONS
for the
CT-7000
Digital Circuit Breaker Analyzer
Vanguard Instruments Company
1710 Grevillea Court
Ontario, California 91761
TEL: (909) 923-9390 October 2003
FAX: (909) 923-9391 Rev 3
CT-7000 Operating Instructions
SAFETY WARNINGS AND CAUTIONS
Only trained operators shall use the device. All circuit breakers under test shall be
fully isolated.
DO NOT SERVICE OR TEST ALONE
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
Due to the added risk of introducing additional or unknown hazards, do not install substitute parts
or perform any unauthorized modifications to any CT-7000 test unit. To ensure that all designed
safety features are maintained, it is recommended that repairs be performed only by Vanguard
Instruments Company’s factory personnel or by an authorized repair and service center.
Unauthorized modifications can cause serious safety hazards and will nullify the manufacturer's
warranty.
FOLLOW EXACT OPERATING PROCEDURES
Any deviation from the procedures described in the operator’s manual may create one or more
safety hazards, damage the CT-7000, the test circuit breaker or cause errors in the test results.
Vanguard Instruments Company, Incorporated assumes no liability for unsafe or improper use of
the CT-7000.
off line and
WARRANTY
The CT-7000’s warranty is only valid to the original purchaser to be free from defects in material
and workmanship for a period of one year. The warranty does not apply to normal wear or
damage from misuse, abuse, improper storage, installation, accident, unauthorized repair or
alterations.
CT-7000 Operating Instructions
Table of Contents
1.0 Introduction
2.0 CT-7000 Description
2.1 Contact Timing Channels
2.2 Analog Voltage Monitoring Channel
2.3 Digital Voltage Monitoring Channel
2.4 Trip/Close Current Monitoring
2.5 Travel Transducer Input Channels
2.6 Breaker Initiate Capability
2.7 Built-in Thermal Printer
2.8 Computer Interface Capabilities
2.9 Timing Shots Storage Capabilities
2.10 Breaker Test Plan Storage Abilities
2.11 Diagnostic Capabilities
2.12 CT-7000 Display and Control Switches
3.0 Test Result Tabulation
3.1 Electrical Measurement Results
3.2 Mechanical Measurement Results
3.3 Analog Voltage Input Results
3.4 Digital Voltage Input Results
3.5 Initiate Current Results
3.6 Slow-Close Test Results
4.0 Test Result Graphics
4.1 Thermal Printer Graphic Printout
4.2 Ink-jet Printer Output
5.0 CT-7000 Controls and Display
6.0 CT-7000 Analyzer Specifications
7.0 CT-7000 Special Features
7.1 CT-7000 Supplied Cables
7.2 CT-7000 Operating Voltages
7.3 CT-7000 Main Power Fuse
7.4 CT-7000 Printer and Printer Paper
7.5 CT-7000 Printer Paper Control
7.6 Replacing CT-7000 Thermal Paper
7.7 CT-7000 LCD Contrast Control
8.0 Test Hook-up Connections
8.1 Contact Cable Hookup
8.2 Initiate Cable Hookup
8.3 Analog Voltage Monitor Hookup
8.4 Digital Voltage Monitor Hookup
8.5 External Trigger Input
8.6 Transducer Connection
9.0 Operating Procedures
9.1 Timing a Circuit Breaker
9.1.1 Timing an OPEN Operation With No Insertion Resistors
9.1.2 Timing an OPEN Operation With Insertion Resistors
9.1.3 Timing CLOSE-OPEN Operation Using Contact Channel #1
9.1.4 Timing OPEN-CLOSE-OPEN Operation
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CT-7000 Operating Instructions
9.2 Get Tabulated Timing Results Using the Thermal Printer
9.2.1 Tabulated Results Interpretation
9.3 Get Graphic Timing Results Using the Thermal Printer
9.4 Save Timing Shots in the EEPROM
9.5 Printing Timing Shot Directory Stored in the EEPROM
9.6 Recalling a Timing Shot
9.7 Deleting a Timing Shot
9.8 Shot Description
9.9 Computer Interface
9.10 Breaker Travel Analysis
9.10.1 Breaker Stroke
9.10.2 Breaker Over-Travel Distance
9.10.3 Breaker Bounce-Back Distance
9.10.4 Contact Wipe
9.10.5 Breaker Velocity
9.10.6 Analysis Point Selections
9.10.7 Analysis Point No.1 (AP1)
9.10.8 Analysis Point No. 2 (AP2)
9.11 Set-Up Open Analysis Points
9.12 Circuit Breaker Test Plan
9.13 Recall a Breaker Test Plan
9.14 Print a Breaker Test Plan
9.15 Print a Breaker Test Plan Directory
9.16 English/Metric or Rotary Transducer Selection
9.17 Set CT-7000 Internal Clock
9.18 Slow-Close Test
9.19 Transducer Self-Test
9.20 Check Cable Hookup
9.21 Automatic Print Setting
9.22 CT-7000 Channel Configuration
9.23 Running CT-7000 in Tandem
10.0 CT-7000 Trouble Shooting Guide
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CT-7000 Operating Instructions
List of Figures
Figure 1.0 CT-7000 Control Panel
Figure 2.0 Contact Cable Connection
Figure 3.0 Series Contact Cable Connection
Figure 4.0 DC Trip and DC Close, Initiate Circuit Cable Hook-Up
Figure 5.0 DC Trip and AC Close, Initiate Circuit Cable Hook-Up
Figure 6.0 Voltage Monitoring Cable Hook-Up
Figure 7.0 External Trigger Cable Hook-Up
Figure 8.0 Transducer Connection
Figure 9.0 CT-7000 Operating Steps
Figure 10.0 Typical Tabulated Printout of an Open Operation From the Thermal Printer
Figure 11.0 Typical Tabulated Printout of an Open Operation From Ink Jet Printer
Figure 12.0 Typical Graphic Result From the Thermal Printer
Figure 13.0 Typical Graphic Printout From the Ink Jet Printer
Figure 14.0 Expansion Graph From 0 to 200ms From the Thermal Printer
Figure 15.0 Expansion Graph From 0 to 200ms From Ink Jet Printer
Figure 16.0 Graphical Interpretation of an Open Timing Shot
Figure 17.0 Graphical Interpretation of a Close Timing Shot
Figure 18.0 Graphical Interpretations of an Open-Close and a Close-Open Timing Shot
Figure 19.0 Printout of the Timing Shot Directory From the Thermal Printer
Figure 20.0 Typical Test Results With Pass/Fail Printout
Figure 21.0 Typical Test Plan Printout of a Siemens SPS2 on Thermal Printer
Figure 22.0 Siemens SPS2 121 Close Timing Illustration
Figure 23.0 Siemens SPS2 121 Open Timing Illustration
Figure 24.0 Typical Test Plan Directory Print Out.
Figure 25.0 Typical Slow-Close Test Report
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IV
CT-7000 Operating Instructions
List of Tables
Table 1.0 CT-7000 Controls and Displays
Table 2.0 CT-7000 Cable set
Table 3.0 Voltage Selection Jumper Setting
Table 4.0 Open Operation With No Insertion Resistors
Table 5.0 Open Operation With Insertion Resistor
Table 6.0 Close-Open Operation Using Contact Channel #1
Table 7.0 Open-Close-Open Operation Using Delay
Table 8.0 Get Tabulated Results
Table 9.0 Plot Chart and Tabulated Report
Table 10.0 Save Timing Shot In EEPROM
Table 11.0 Print Timing Shot Directory
Table 12.0 Recalling a Timing Shot
Table 13.0 Deleting a Timing Shot
Table 14.0 Entering Shot Identification Header
Table 15.0 Selecting or Aborting Computer Control
Table 16.0 Setting Up "OPEN" Analysis Points Using Distance
Table 17.0 Recalling a Test Plan
Table 18.0 Print a Test Plan
Table 19.0 Print a Breaker Test Plan Directory
Table 20.0 Select Metric Units of Measure
Table 21.0 Select Rotary Transducer
Table 22.0 Setting the Clock and Calendar
Table 23.0 Performing a Slow-Close Test
Table 24.0 Performing a Transducer Self Test
Table 25.0 Checking the Cable Hookup
Table 26.0 Automatic Print Setting
Table 27.0 Channel Configuration
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CT-7000 Operating Instructions
Appendix
APPENDIX A
APPENDIX B
APPENDIX C
APPENDIX D
APPENDIX E
APPENDIX F
APPENDIX G
APPENDIX H
APPENDIX I
ITE Circuit Breaker model 14.4K Timing Chart
CLOSE-OPEN Timing Chart for ITE Circuit Breaker Model 14.4K
CLOSE-OPEN Tabulated Report for ITE Circuit Breaker Model 14.4K
OPEN-CLOSE Timing Chart for ITE Circuit Breaker Model 14.4K
OPEN-CLOSE Tabulated Report for ITE Circuit Breaker Model 14.4K
SIEMENS TCP Breaker Velocity Calculation
SIEMENS SPS2 Breaker Velocity Calculation
CT-7000 SIEMENS SPS2 Test Plan
CT-7000 Transducer Illustration
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VI
CT-7000 Operating Instructions
1.0 Introduction
The CT-7000 is a microprocessor-based, digital time travel, circuit breaker analyzer. The CT7000 can fully analyze a utility circuit breaker’s performance by measuring: the contact time,
stroke, velocity, over-travel, bounce-back and contact wipe.
The contact motion analysis includes: Open, Close, Open-Close, Close-Open and OpenClose-Open operations. A timing window is selectable between one second, ten second and
twenty second periods. The ten and twenty second windows allow timing of long events such as
circuit switcher contacts.
The CT-7000 is available with the following configurations:
CT-7000-3:
n
Three Contact-Input channels
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Three Digital Travel Transducer Input channels
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One Analog Voltage Monitor Input channel
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One Digital Voltage Monitor Input channel
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One Trip/Close Current Monitor channel
CT-7000-6:
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Six Contact-Input channels
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Three Digital Travel Transducer Input chan nels
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One Analog Voltage Monitor Input channel
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One Digital Voltage Monitor Input channel
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One Trip/Close Current Monitor channel
CT-7000-12:
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Twelve Contact-Input channels
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Three Digital Travel Transducer Input channels
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One Analog Vol tage Monitor Input channel
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One Digital Voltage Monitor Input channel
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One Trip/Close Current Monitor channel
There are two different modes of operation for the CT-7000 which are Stand Alone Mode and
Computer Control Mode. The manual will focus on the Stand Alone Mode. The Computer Control
Mode is covered under the CT-6500/7000/7500/DIGITMR PC software manual.
2.0 CT-7000 Description
The CT-7000 applies a test voltage of 35 Vdc to each of the contact channels thus allowing an
analog to digital converter (A/D) to determine if a close, an open or an insertion resistor was the
state of contact. The CT-7000 records into the memory 10,000 readings from the A/Ds and the
transducer position counters. The contact time, circuit breaker stroke and velocity is then derived
from the data that was stored in the memory.
The CT-7000 uses an up-down counter to sense the breaker’s transducer reading. The CT7000 travel transducer employs optical encoders to send quadrature signals to the CT-7000’s
counters. With the use of digital transducers and counters, the need to set up or calibrate the
transducers is eliminated.
A built-in, initiate circuit allows the user to operate the circuit breakers. Since the solid-state
circuit is controlled by a microprocessor, the CT-7000 can perform multiple contact operations
with ease. The initiate circuit is fuse protected for trip and close operations. The user is required
to hold the “ARM” switch during a test to complete the initiate circuit as a safety feature.
CT-7000 Operating Instructions
The CT-7000 can also store up to 100 breaker timing test records and 99 breaker test-plans
into the FLASH EEPROM. Stored timing records can be recalled, printed or transferred to a
personal computer. Using the breaker test plan with a timing test, the users do not have to set the
velocity calculating points. The test report will also print “PASS” and “FAIL” results.
2.1 Contact Timing Channels
A breaker's interruption of contacts is timed with the dry-contact input channels. Each channel
can detect the main contacts and the insertion resistor contact times in milliseconds and cycles.
NOTE
The CT-7000 can detect insertion resistors ranging from 10 to 7,000 Ohms.
Resistances over 7,000 Ohms are detected as an open contact.
2.2 Analog Voltage Monitoring Channel
One analog voltage, input channel, “V1” is dedicated to monitoring the breaker's DC power
supply or coil voltages from 0 to 255 Vdc or peak Vac.
NOTE
Input voltage ranges from 0 to 300 Vdc or peak Vac. Reading ranges from 0 to 255 Vdc.
2.3 Digital Voltage Monitoring Channel
One digital voltage, input channel, “V2” monitors the status voltage as “ON” or “OFF.” Voltages
from 30 to 255 Vdc is considered as “ON” status. Voltages less than 30 Vdc is considered as
“OFF” status.
2.4 Trip/Close Current Monitoring
A built-in, hall-effect, current sensor records the trip and close coil current levels and duration.
The coil current waveform can be graphically plotted onto a printout. The current reading is also
printed in the tabulated report.
2.5 Travel Transducer Input Channels
Each CT-7000 has three digital transducer, input channels. The CT-7000 will interface with a
linear, a rotary and other special transducers developed by Vanguard Instruments Company.
Please refer to Appendix I for more details.
2.6 Breaker Initiate Capability
A built-in, solid-state, initiate device allows the user to operate a breaker from the CT-7000.
Operational modes include: Open, Close, Open-Close, Close-Open and Open-Close-Open. The
multiple operations of: Open-Close, Close-Open and Open-Close-Open can be initiated with a
programmable delay time or by sensing the breaker's contact state.
The solid-state switching implemented in the initiate circuitry allows the CT-7000 to switch a
breaker's AC or DC control circuit. Two 5 Ampere, fast-blow fuses protect each trip and close
circuits. An interlock, “ARM” switch also protects the initiate circuit.
2.7 Built-in Thermal Printer
The breaker's contact analysis results can be outputted in both tabular and graphical formats
by a built-in, 4.5 inch wide, thermal printer. Refer to paragraph 7.4 for ordering thermal paper.
2.8 Computer Interface Capabilities
A built-in, RS-232C port permits the CT-7000 to be interfaced with an IBM-compatible
CT-7000 Operating Instructions
personal computer. A Windows-based Breaker Analysis Software is supplied with each CT-7000.
The software is compatible with Windows 95, 98, Me, 2000, NT and XP. The software allows the
user to:
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Remotely time circuit breakers from a personal computer.
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Retrieve timing shots stored in the CT-7000.
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Down-loading circuit-breaker test plans to CT-7000.
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2.9 Timing Shots Storage Capabilities
store timing-shot data. Unlike other media, EEPROMs are immune to temperature, shock and
humidity. Stored shots can be recalled to reanalyze the test data, to reprint test reports or to
transfer data to a personal computer for record keeping. Up to 100 timing shots can be stored in
the EEPROMs. The number of shots stored in the EEPROMs may vary depending upon the size
of the shot records.
2.10 Breaker Test Plan Storage Abilities
specifications (i.e., stroke, velocity, contact time). By recalling and using a test plan, operators can
immediately test breakers and view a pass/fail report (made by comparing test performance with
specifications in the test plan.
CT-7000). Test plan is then loaded into the CT-7000 via the RS-232C serial port.
Recall timing shots from a hard drive for reanalysis at an office PC.
The CT-7000 uses Electrically Erasable Programmable Read-Only-Memory (EEPROM) to
Up to 99 breaker’s test plan can be stored in the CT-7000. Test plans comprise breaker
A breaker test plan can be created by using the Breaker Analysis Software (supplied with each
2.11 Diagnostic Capabilities
The CT-7000 is designed with self diagnostic capability to check the integrity of the
electronics. Self testing of the contact cable hook-up and transducers permits the user to examine
the CT-7000‘s components whenever verification is required.
2.12 CT-7000 Display and Control Switches
An alphanumeric keypad enables the user to operate the CT-7000 and to enter the breaker’s
nameplate data such as: the substation name, breaker model and other descriptions. A 4-line by
20-character LCD readout displays user messages and menus. The LCD is backlit to allow
messages can be viewed in low light conditions.
CT-7000 Operating Instructions
3.0 Test Result Tabulation
3.1 Electrical Measurement Results
Under the Time Travel Mode, each CT-7000 contact channel provides the following test
results:
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Contact Close time
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Contact Open time
The CT-7000 can detect insertion resistors ranging from 10 to 7,000 Ohms.
Resistances over 7,000 Ohms are detected as an open contact.
3.2 Mechanical Measurement Results
Under the Time Travel Mode the digital, transducer channel provides the following test results:
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Insertion Resistor Contact Open and Close times
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Contact Bounce time
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Resistor On time
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Contact Spread time
NOTE
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Breaker stroke
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Over travel
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Bounce back
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Contact wipe
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Contact velocity
Breaker contact speed calculations are based upon a contact's travel distance over a period
of time, which is defined by the manufacturer's specifications.
A CT-7000 not only calculates simple distance over-time speeds, but can also support other
formulas. An example is the Siemens SPS2 breaker calculation formula:
V=12.2 x a/b
The formula and analysis point can be stored in a test plan for use later in the field.
NOTE
If operators use a breaker test plan (See paragraph 9.13) during testing, the test
report will also indicate a Pass/Fail condition for each test parameter (i.e contact
time, stroke, velocity, etc.).
3.3 Analog Voltage Input Results
The analog voltage, input channel, “V1” measures the breaker's DC control voltage during an
operation. Printed voltage readings include nominal voltage, when the supply voltage has no load;
and minimum voltage, when the supply voltage is under load or when a coil is energized.
The “V1” connection allows the user to monitor the DC power supply’s voltage fluctuations during
a breaker operation. The feature is effective in detecting the breaker’s power supply problem,
which normally can not be seen by using a voltmeter.
NOTE
Voltage readings can range from 1 to 255 Vdc.
CT-7000 Operating Instructions
3.4 Digital Voltage Input Results
The digital voltage, input channel, “V2” monitors the voltage status as “ON” or “OFF” conditions
and graphs the result. A voltage level above 30 Vdc is considered as the “ON” state. The input
channel is dedicated to monitor the breaker’s auxiliary switch action during a breaker operation.
NOTE
Input voltage ranges from 1 to 300 Vac/dc.
3.5 Initiate Current Results
The CT-7000 not only plots the trip or close current waveforms, but also prints the steady-state
current readings of the trip and close coils during an operation. A typical circuit breaker timing
report is shown on Figure 10.0.
3.6 Slow-Close Test Results
A Slow-Close test determines the contact touch distance and penetration by using the travel
transducer and dry contact channels.
4.0 Test Result Graphics
4.1 Thermal Printer Graphic Printout
A 4.5 inch wide, built-in, thermal printer can output graphic waveforms of the contact channels,
travel curves and actuator-coil currents. Using the Zoom Graphics Mode, the user can enlarge the
graphical outputs by specifying the timing zone. Typical graphical results are shown in Figures
12.0 and14.0.
4.2 Ink-jet Printer Output
A color graphic report can be printed on the HP Ink-jet printer (supplied with each CT-
7000). The CT-7000 will print color graphics of contact channels, travel channels, current wave
forms on 8½ by 11-inch paper.
CT-7000 Operating Instructions
5.0 CT-7000 Controls and Display
Before using the CT-7000, users should become familiar with all of the controls and display
indications. The keypad and display are used to operate the CT-7000. Figure 1.0 represents the
control panel and the numbered lines pointing to each control and indicator refer to Table 1.0,
which describes the function of each control and indicator.
Figure 1.0 CT-7000 Control Panel
CT-7000 Operating Instructions
Table 1.0 CT-7000 Controls and Displays
Fig. 1.0
Index no.
1
2
3
4
5
6
7
PANEL MARKING FUNCTIONAL DESCRIPTION
CONTACT INPUT
Female connectors for the contact channels.
(1 –12)
30-300V
V1 & V2
VOLTAGE INPUT
30-300V
TRIGGER
3-pin connectors. Each input is a voltage detector for
the timing voltages of the trip or close coil switching
during the active period. Voltage detection level ranges
from 30 to 300 Vdc or peak.
3-pin connector triggers timing functions. Voltage levels
ranging from 30 to 300 Vac, dc or peak.
VOLTAGE INPUT
120/240Vac, 2A, 50-60Hz
Fuse: 250Vac, 3A Fast-Blow
GROUND
T1, T2, T3
TRANSDUCER INPUT
(Printer; No panel marking)
3-wire power plug. 3 Ampere, AC fuses. The ON/OFF
switch is a 2-pole rocker.
Safety, ground terminal. 5/16-18 thread stud, with wing
nut.
16-pin connectors. Each input is a travel encoder input
used for contact, motion data.
Thermal printer. Microprocessor controlled printer that
uses specially treated, 4.5 inch wide paper.
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1-9, 0, ENTER, START,
STOP, CLEAR,
PAPER LCD,
↑
PAPER LCD
↓
“PUSH” TO ARM
(Display; no panel marking)
CLOSE
250V, 5A FAST-BLOW
OPEN
250V, 5A FAST-BLOW
INITIATE
RS-232C
PRINTER
16 button keypad. The keys are momentary-contact,
pushbutton switches. Allows users to make menu
selections, enter alphanumeric data, adjust the LCD
contrast and reposition the printer paper.
Spring-loaded, pushbutton switch. Press and hold to
complete the Trip or Close circuits for breaker tests.
4-line by 20-character, backlit LCD. Displays menus,
options, prompts and test result data.
Close circuit fuse: 5 Ampere, 250V, Fast-Blow.
Open circuit fuse: 5 Ampere, 250V, Fast-Blow.
4-pin connector used for the switching circuit for
operating the circuit breaker under test.
9-pin connector for serial computer interface.
Parallel printer port.
CT-7000 Operating Instructions
6.0 CT-7000 Analyzer Specifications
CONTACT TIMING Open, Close, Open-Close, Close-Open, and Open-Close-Open.
SIZE & WEIGHT 16d by 14w by 11h (inches), less than 32 pounds.
OPERATING POWER 2 Ampere, 90-120 Vac / 200-240 Vac 50/60 Hz.
TIMING WINDOW Selectable between: 1, 10, or 20 second.
RESOLUTION ±100 microseconds at 1 second duration.
±1.0 millisecond at 10 second duration.
±2.0 millisecond at 20 second duration.
DRY-CONTACT INPUT 3 or 6 or 12 contact channels. All contact inputs are grounded until testing
is started. Each contact detects main and insertion resistor contacts.
CONTACT RESISTANCE CLOSED: less than 20 Ohms.
OPEN: greater than 10,000 Ohms.
INSERTION RESISTANCE Ranges from 10 to 7,000 Ohms.
TRIGGER INPUT Open/Close: 30 to 300 Vdc, peak Vac.
VOLTAGE INPUTS 2 voltage inputs, sensitivity ranging from 1.0 to 300 Vdc, peak Vac.
Analog voltage recording ranges from 1.0 to 255 Vdc.
CURRENT-SENSOR INPUT 1 non-contact, hall-effect sensor ranging from 0.2 to 20 Amperes, DC to 5 kHz.
BREAKER INITIATE Initiate Open, Close, Open-Close, Close-Open, Open-Close-Open.
TRAVEL TRANSDUCER 3 travel-transducer channels. Linear motion from 0.0 to 60.0 inches (±0.01) inch.
INPUT Rotary ranges from 0 to 360o (± 0.36º).
BREAKER SLOW-CLOSE
TEST Measures the contact point distance.
STORAGE CAPABILITIES Store 99 Circuit Breaker Test Plans.
Store up to 100 timing records.
BREAKER ANALYSIS Windows 95, 98, 2000, NT, XP compatible.
SOFTWARE (included) The analysis software can be installed on a IBM-compatible computer for graphical
display, numerical reports and database utility for office use.
COMPUTER INTERFACE RS-232C Port.
DISPLAY Backlit LCD screen, 4-lines by 20-characters, sunlight viewable.
HARD-COPY PRINTOUT Contact travel waveforms and tabulated results printout on 4.5 inch thermal paper.
CARRYING CASE (optional) Hard shipping case for CT-7000 and cables.
Hard shipping case for Travel Transducers.
WARRANTY One year warranty on parts and labor. Post-warranty service contracts available.
7.0 CT-7000 Special Features
7.1 CT-7000 Supplied Cables
ITEM DESCRIPTION QTY
1 GND Cable 1
2 Power Cord 1
3 Contact Cable 3 or 6 or 12
4 Contact Extension Cable 3 or 6 or 12
5 Transducer cable 1
6 Voltage & Trigger Leads 3
7 Voltage & Trigger Extension cables 3
8 Initiate Lead 1
9 Initiate Extension Cable 1
10 RS-232C Cable 1
CT-7000 Operating Instructions
Table 2.0 CT-7000 Cable set
CT-7000 Operating Instructions
7.2 CT-7000 Operating Voltages
The CT-7000 operating voltage is selectable between 110/120 Vac, 50/60 Hz or 220/240
Vac, 50/60 Hz. Voltage selection is set by the JP1 connector on the Power Supply board and the
JP3 connector on the Initiate board of the CT-7000. The jumper settings for the connectors are
shown in Table 3.0.
Table 3.0 Voltage Selection Jumper Setting
VOLTAGE SELECTION CONNECTOR PIN
110-120 Vac Pin 1& 2, 3 & 4
220-240 Vac Pin 2 & 3
An initiate circuit relay with the corresponding operating voltage must also be installed in the
CT-7000 Initiate board.
NOTE
The factory sets the operating voltage.
7.3 CT-7000 Main Power Fuse
The CT-7000 uses an AC input module that contains the AC receptacle, power switch and
protective fuses. The 3 Ampere replacement fuses should be 20mm, 250Vac, fast-blow types.
NOTE
The OPEN and CLOSE initiate are 5 Ampere fuses that should be 3AG, 250Vac,
fast-blow types.
7.4 CT-7000 Printer and Printer Paper
The built-in, thermal printer uses 4.5 inch wide, thermal paper for printing test results. To
maintain the highest, quality printing and to avoid paper jamming, it is highly recommended that
the thermal paper be supplied by the factory. Additional paper can be ordered from either of the
two sources listed below:
Vanguard Instruments Co, Inc.
1710 Grevillea Court
Ontario, CA 91761
Tel: 909-923-9390
Fax: 909-923-9391
Part Number: TP-4 Paper
BG Instrument Co.
13607 E. Trent Avenue
Spokane, WA 99216
Tel: 509-893-9881
Fax: 509-893-9803
Part Number: TP-4 paper
CT-7000 Operating Instructions
7.5 CT-7000 Printer Paper Control
To advance the paper from the printer, press and release the “↑ PAPER LCD” button. To
retract the thermal paper from the printer, press and release the “↓ PAPER LCD” button.
7.6 Replacing CT-7000 Thermal Paper
The roll of thermal paper resides inside a pocket underneath the printer cover. To replace the
paper, follow the steps below:
n Remove the printer cover.
n Remove the leftover thermal paper roll from the paper holder.
n Unroll the new thermal paper.
n Feed the thermal paper into the slot between the paper pocket and the rubber
roller. The printer will au tomatically pull the paper under the thermal head.
n Place the paper roll into the paper holder.
n Lift the thermal head and align the thermal paper if necessary.
n Replace the printer cover back.
NOTE
The thermal paper will show a red stripe in the margin to indicate that the roll is
about to run out of paper.
7.7 CT-7000 LCD Contrast Control
To darken the LCD screen, press and hold the “↑ PAPER LCD” button, while to decrease the
contrast of the LCD screen, press and hold the “↓ PAPER LCD” until the desired contrast is
reached.
CT-7000 Operating Instructions
8.0 Test Hook-up Connections
8.1 Contact Cable Hookup
A typical, contact cable connection to a circuit breaker is shown in Figure 2.0. Red clips are
connected to phase A, B and C of the breaker’s bushings. The black clips are connected on the
grounded or common, side of the bushings. For circuit breakers with series contacts, connect the
contact cables as shown in Figure 3.0.
NOTE
It is advisable to ground one side of the contacts for most testing purposes. If a breaker
is floating or ungrounded, ensure that the contact channel inputs are protected against
static discharge.
Figure 2.0 Contact Cable Connection
CT-7000 Operating Instructions
Figure 3.0 Series Contact Cable Connection
CT-7000 Operating Instructions
8.2 Initiate Cable Hookup
The CT-7000 will trip or close breakers through a solid-state device, which will operate 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 test hookup is shown in Figure 4.0.
A typical DC trip and AC close, control circuit test hookup is shown in Figure 5.0.
Figure 4.0 DC Trip and DC Close, Initiate Circuit Cable Hook-Up
Figure 5.0 DC Trip and AC Close, Initiate Circuit Cable Hook-Up
CT-7000 Operating Instructions
8.3 Analog Voltage Monitor Hookup
The analog, voltage input, “V1” permits the user to monitor a breaker's DC control voltage
during an operation. The analog, voltage input will record 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 will be printed on a tabulated report. Analog
waveforms will also be plotted in a graphical format. Thus, the user is able to see the breaker's
DC control voltage "dip" under load conditions. Problems, such as a poor connection or an
excessive voltage drop, during operation can be easily detected.
A typical voltage monitoring hook up scheme is shown on Figure 6.0.
NOTE
The maximum voltage that can be recorded is set at 255 Vdc.
Figure 6.0 Voltage Monitoring Cable Hook-Up
8.4 Digital Voltage Monitor Hookup
The digital, voltage input channel, “V2” permits the user to monitor the voltage status as “ON”
or “OFF” states. The voltage “ON” or “OFF” states will be plotted on the graphical report. A typical
hook up is shown in Figure 6.0.
CT-7000 Operating Instructions
8.5 External Trigger Input
The External Trigger Mode enables the user to start recording data when the CT-7000 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 user will need to connect the CT-7000’s
initiate cable to the close terminal shown in Figure 4.0. The CT-7000 will energize the 52X relay
to start the close operation, which will then start the timing when the CT-7000 senses the voltage
across the closing coil. See Figure 7.0 for a typical test hookup. Another application for external
trigger is to start timing the breaker when the user trips or closes the breaker remotely.
NOTE
Minimum trigger voltage is set for 30 Vac/dc. Maximum, continuous voltage is limited at
300 Vac/dc. Different trigger voltages can be set at the factory, based upon specific
requests.
The CT-7000 will start looking for the external trigger voltage when the message,
“AWAITING TRIGGER…” is shown on the LCD screen. The external trigger voltage
needs to be sensed by the CT-7000 within 30 seconds after the initiate sequence has
begun. The CT-7000 will return to the main menu if no voltage is sensed.
Figure 7.0 External Trigger Cable Hook-Up
CT-7000 Operating Instructions
8.6 Transducer Connection
A typical transducer connection is shown on Figure 8.0. See Appendix I for more transducer
connections.
Figure 8.0 Transducer Connection
CT-7000 Operating Instructions
HOOKUP CT-7000
APPLY POWER
TIMER BREAKER
GET RESULTS
9.0 Operating Procedures
The main steps to time a circuit breaker are listed in Figure 9.0.
.
1. GROUND THE CT-7000 (See NOTE)
2. CONNECT CT-7000 CABLES TO BREAKER
3. INSTALL TRANSDUCER WITH CABLE
1. TURN THE CT-7000 ON
2. PERFORM SELF TESTS: HOOK-UP TEST,
CABLE TEST, IF NECESSARY
1. SELECT THE CT-7000 TEST
2. OPERATE THE BREAKER
1. READ OR PRINT THE TABULATED RESULTS
2. PRINT THE GRAPHICAL RESULTS
3. SAVE THE TIMING SHOT
Figure 9.0 CT-7000 Operating Steps
NOTE
To reduce the possibility of damaging the CT-7000 contact channels due to static
discharge in the high voltage substations, it is recommend to ground one side of
the breaker’s bushings.
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