Vanguard CT-6500 User Manual

OPERATING INSTRUCTIONS

for the

CT-6500

Digital Circuit Breaker Analyzer

Vanguard Instruments Company

1710 Grevillea Court
Ontario, California 91761

TEL: [phone] September 2003
FAX: [phone] Rev 2

CT-6500 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-6500 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-6500, 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-6500.

off line and

WARRANTY

The CT-6500’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-6500 Operating Instructions

Table of Contents

1.0 Introduction

2.0 CT-6500 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 Diagnostic Capabilities

2.11 CT-6500 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

5.0 CT-6500 Controls and Display

6.0 CT-6500 Analyzer Specifications

7.0 CT-6500 Special Features

7.1 CT-6500 Supplied Cables

7.2 CT-6500 Operating Voltages

7.3 CT-6500 Main Power Fuse

7.4 CT-6500 Printer and Printer Paper

7.5 CT-6500 Printer Paper Control

7.6 Replacing CT-6500 Thermal Paper

7.7 CT-6500 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

9.2 Get Tabulated Timing Results Using the Thermal Printer

9.2.1 Tabulated Results Interpretation

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CT-6500 Operating Instructions

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 English/Metric or Rotary Transducer Selection

9.13 Set CT-6500 Internal Clock

9.14 Slow-Close Test

9.15 Transducer Self-Test

9.16 Check Cable Hookup

9.17 Automatic Print Setting

9.18 CT-6500 Channel Configuration

9.19 Running CT-6500 in Tandem

10.0 CT-6500 Trouble Shooting Guide

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CT-6500 Operating Instructions

List of Figures

Figure 1.0 CT-6500 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-6500 Operating Steps
Figure 10.0 Typical Tabulated Printout of an Open Operation From the Thermal Printer
Figure 11.0 Typical Graphic Result From the Thermal Printer
Figure 12.0 Expansion Graph From 0 to 200ms From the Thermal Printer
Figure 13.0 Graphical Interpretation of an Open Timing Shot
Figure 14.0 Graphical Interpretation of a Close Timing Shot
Figure 15.0 Graphical Interpretations of an Open-Close and a Close-Open Timing Shots
Figure 16.0 Printout of the Timing Shot Directory From the Thermal Printer
Figure 17.0 Typical Slow-Close Test Report

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IV

CT-6500 Operating Instructions

List of Tables

Table 1.0 CT-6500 Controls and Displays
Table 2.0 CT-6500 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 Select Metric Units of Measure
Table 17.1 Select Rotary Transducer
Table 18.0 Setting the Clock and Calendar
Table 19.0 Performing a Slow-Close Test
Table 20.0 Performing a Transducer Self Test
Table 21.0 Checking the Cable Hookup
Table 22.0 Automatic Print Setting
Table 23.0 Channel Configuration

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CT-6500 Operating Instructions

Appendix

APPENDIX A
APPENDIX B
APPENDIX C
APPENDIX D
APPENDIX E
APPENDIX F

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

CT-6500 Transducer Illustration

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VI

CT-6500 Operating Instructions

1.0 Introduction

The CT-6500 is a microprocessor-based, digital time travel, circuit breaker analyzer. The CT­6500 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-6500 is available with the following configurations:

CT-6500-3:

n

Three Contact-Input channels

n

Three Digital Travel Transducer Input channels

n

One Analog Voltage Monitor Input channel

n

One Digital Voltage Monitor Input channel

n

One Trip/Close Current Monitor channel

CT-6500-6:

n

Six Contact-Input channels

n

Three Digital Travel Transducer Input channels

n

One Analog Voltage Monitor Input channel

n

One Digital Voltage Monitor Input channel

n

One Trip/Close Current Monitor channel

CT-6500-12:

n

Twelve Contact-Input channels

n

Three Digital Travel Transducer Input channels

n

One Analog Voltage Monitor Input channel

n

One Digital Voltage Monitor Input channel

n

One Trip/Close Current Monitor channel

There are two different modes of operation for the CT-6500 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-6500 Description

The CT-6500 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-6500 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-6500 uses an up-down counter to sense the breaker’s transducer reading. The CT­6500 travel transducer employs optical encoders to send quadrature signals to the CT-6500’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-6500 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-6500 Operating Instructions

The CT-6500 can also store up to 100 breaker timing test records into the FLASH EEPROM.
Stored timing records can be recalled, printed or transferred to a personal computer.

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-6500 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-6500 has one digital transducer, input channel. The CT-6500 will interface with a
linear, a rotary and other special transducers developed by Vanguard Instruments Company,
Incorporated. Please refer to Appendix F 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-6500.
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-6500 to switch a
breaker's AC or DC control circuit. Two 5 Ampere, slow-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-6500’s EEPROMs to be interfaced with an IBM­compatible personal computer. A Windows-based Breaker Analysis Software is supplied with
each CT-6500. The software is compatible with Windows 95, 98, Me, 2000, NT and XP. The

CT-6500 Operating Instructions

software allows the user to:

n

Remotely time circuit breakers from a personal computer.

n

Retrieve timing shots stored in the CT-6500.

n

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 Diagnostic Capabilities

electronics. Self testing of the contact cable hook-up and transducers permits the user to examine
the CT-6500‘s components whenever verification is required.

2.11 CT-6500 Display and Control Switches

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.

Recall timing shots from a hard drive for reanalysis at an office PC.

The CT-6500 uses Electrically Erasable Programmable Read-Only-Memory (EEPROM) to

The CT-6500 is designed with self diagnostic capability to check the integrity of the

An alphanumeric keypad enables the user to operate the CT-6500 and to enter the breaker’s

3.0 Test Result Tabulation

3.1 Electrical Measurement Results

Under the Time Travel Mode, each CT-6500 contact channel provides the following test
results:

n

Contact Close time

n

Contact Open time

n

Insertion Resistor Contact Open and Close times

n

Contact Bounce time

n

Resistor On time

n

Contact Spread time

CT-6500 Operating Instructions

NOTE

The CT-6500 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:

n

Breaker stroke

n

Over travel

n

Bounce back

n

Contact wipe

n

Contact velocity

Breaker contact speed calculations are based upon a contact's travel distance ove r a period
of time, which is defined by the manufacturer's specifications.

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.

3.4 Digital Voltage Input Results

The digital voltage, input channel, “V2” monit ors 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-6500 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.

CT-6500 Operating Instructions

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

11.0 and12.0.

5.0 CT-6500 Controls and Display

Before using the CT-6500, users should become familiar with all of the controls and display
indications. The keypad and display are used to operate the CT-6500. 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-6500 Control Panel

CT-6500 Operating Instructions

Table 1.0 CT-6500 Controls and Displays

Fig. 1.0

Index no.

1

2

3

4

5

6

7

PANEL MARKING FUNCTIONAL DESCRIPTION

CONTACT INPUT

Female connector for the 3 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, 5A 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.

8

9

10

11

12

13

14

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

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.

CT-6500 Operating Instructions

6.0 CT-6500 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.

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-6500 and cables.

Hard shipping case for Travel Transducers.

WARRANTY One year warranty on parts and labor. Post-warranty service contracts available.

7.0 CT-6500 Special Features

7.1 CT-6500 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-6500 Operating Instructions

Table 2.0 CT-6500 Cable set

CT-6500 Operating Instructions

7.2 CT-6500 Operating Voltages

The CT-6500 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-6500. 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-6500 Initiate board.

NOTE

The factory sets the operating voltage.

7.3 CT-6500 Main Power Fuse

The CT-6500 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-6500 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: [phone]
Fax: [phone]
Part Number: TP-4 Paper

BG Instrument Co.
13607 E. Trent Avenue
Spokane, WA 99216
Tel: [phone]
Fax: [phone]
Part Number: TP-4 paper

CT-6500 Operating Instructions

7.5 CT-6500 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-6500 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 automatically 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-6500 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-6500 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-6500 Operating Instructions

Figure 3.0 Series Contact Cable Connection

CT-6500 Operating Instructions

8.2 Initiate Cable Hookup

The CT-6500 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-6500 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.