Vanguard CT-7500 User Manual

OPERATING INSTRUCTIONS

For the

Model CT-7500

A Digital Circuit-Breaker Analyzer

Manufactured by

Vanguard Instruments Co., Inc.

1711 Grevillea Ct.

Ontario, California 91761

TEL: [phone] Jan 2001
FAX: [phone] Rev 2

MODEL CT-7500 OPERATING INSTRUCTIONS

TABLE OF CONTENTS

1.0 INTRODUCTION…. …..

2.0 CT-7500 DESCRIPTION

2.1 On-Line Timing (Quick-Shot) Mode

2.2 Time-Versus-Travel Circuit Breaker Analyzer Mode

2.2.1 Contact Timing Channels

2.2.1 Analog Voltage Monitoring Channel

2.2.3 Digital Voltage Monitoring Channel

2.2.4 Trip/Close Current Monitoring

2.2.5 Travel Transducer Input Channels

2.2.6 Breaker Initiate Capability

2.2.7 Built-In Thermal Printer

2.2.8 Printer Port

2.2.9 Computer Interface Capabilities

2.2.10 Timing Shots Storage Capabilities

2.2.11 Breaker Test Plan Storage Abilities

2.2.12 Diagnostic Capabilities

2.2.13 CT-7500 Display Control Switches

3.0 TEST RESULTS 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

4.0 TEST-RESULT GRAPHICS

4.1 Thermal Printer Graphic Printout

4.2 Ink-Jet Printer Output

5.0 CONTROLS AND DISPLAY

6.0 CT-7500 ANALYZER SPECIFICATIONS

7.0 CT-7500 SPECIAL FEATURES

7.1 CT-7500 Operating Voltage

7.2 CT-7500 Main Power Fuse

7.3 CT-7500 Printer and Printer Paper

7.4 CT-7500 Printer Paper Control

7.5 Replacing CT-7500 Thermal Paper

7.6 CT-7500 LCD Contrast Control

8.0 TEST HOOKUP 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 AC Current Sensor Hookup

9.0 OPERATING PROCEDURES

9.1 Timing a Circuit Breaker

9.1.1 Timing an Open Operation With No Resistor

9.1.2 Timing an Open Operation With Insertion Resistor

9.1.3 Timing Close-Open Operation Using Channel #1

9.2 Get Tabulated Results Using Thermal Printer

9.3 Get Graphic Timing Results Using Thermal Printer

9.4 Save Timing Shot in EEPROM

9.5 Print EEPROM Timing Shot Directory

9.6 Recall a Timing Shot

9.7 Deleting a Timing Shot

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MODEL CT-7500 OPERATING INSTRUCTIONS

9.8 Recall a Breaker Test Plan

9.9 Print a Breaker Test Plan

9.10 Print Breaker Test Plan Directory

9.11 Shot Description

9.12 CT-7500 Channel Configuration

9.13 Computer Interface

9.14 Breaker Travel Analysis

9.14.1 Breaker Stroke

9.14.2 Breaker Over-Travel Distance

9.14.3 Breaker Bounce-Back Distance

9.14.4 Contact Wipe

9.14.5 Breaker Contact Velocity

9.14.6 Analysis Point Selection

9.14.7 Analysis Point No 1

9.14.8 Analysis Point No 2

9.15 Set-Up Open Timer Analysis Points

9.16 English/Metric Selection

9.17 Set CT-7500 Internal Clock

9.18 Slow-Close Test

9.19 Transducer Self Test

9.20 Check Cable Hookup

9.21 Automatic Print Setting

10.0 Running the CT-7500s in Tandem

11.0 CT-7500 Trouble Shooting Guide

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APPENDIX

A. ITE Circuit Breaker Model 14.4K Timing Chart
B. CT-7500 Test Plan for ITE Circuit Breaker Model 14.4K.
C. CT-7500 Timing Chart for ITE Circuit Breaker Model 14.4K.
D. CT-7500 Tabulated Test Report for ITE Circuit Breaker Model 14.4K.
E. Timing Chart for Siemens TCP-149 Circuit Breaker
F. CT-7500 Test Plan for Siemens TCP-149 Circuit Breaker

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MODEL CT-7500 OPERATING INSTRUCTIONS

LIST OF FIGURES

Figure 5-1. CT-7500 Control Panel
Figure 8-1. Typical Circuit-Breaker Test Cable Hookup
Figure 8-2. Typical Series Contacts Test Cable hookup
Figure 8-3. Typical Dc Trip and Close Control Test Cable Hookup
Figure 8-4. Typical DC Trip and AC Close Control Test Cable Hookup
Figure 8-5. Typical Voltage-Monitoring Test Cable Hookup
Figure 8-6. Typical External Trigger Hookup
Figure 8-7. Transducer Cable Hookup
Figure 8-8. AC Current Sensor Hookup
Figure 9-0. CT-7500 Operating Steps
Figure 9-1. Steering Map of Menus and User Options
Figure 9-2. Typical Tabulated Printout of Open Operation on Thermal Printer
Figure 9-3. Typical Tabular Printout of Open Operation on Ink-Jet Printer
Figure 9-4. Typical Graphic result on Thermal Printer
Figure 9-5. Typical Graphic report on Ink-Jet Printer
Figure 9-6. Typical Graphic-Expansion result Printout on Thermal Printer
Figure 9-7. Open and Close Timing Graph Interpretation
Figure 9-8. Open-Close and Close-Open Graph Interpretation
Figure 9-9. Typical Timing Shot Directory Printout on Thermal Printer
Figure 9-10 Typical Test-Plan Printout on Thermal Printer
Figure 9-11 Typical Test Plan Directory Printout
Figure 9-12 Typical Slow-Close Test Report

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LIST OF TABLES

Table 5-1 Model CT-7500 Controls and Display
Table 7-1 Voltage Selection Jumper Setting
Table 9-1. Open Operation with No Resistor
Table 9-2. Open Operation with Insertion Resistor
Table 9-3. Close-Open Operation with No Resistor
Table 9-4. Get Tabulated Results
Table 9-5. Plot Chart and Tabulated Report
Table 9-6. Save Timing Shot in EEPROM
Table 9-7. Print Timing Shot Directory
Table 9-8. Recall a Timing Shot
Table 9-9. Delete a Timing Shot
Table 9-10.Recall a Test Plan
Table 9-11.Print a Breaker Test Plan
Table 9-12.Print a Breaker Test Plan Directory
Table 9-13.Entering Shot Identification Header
Table 9-14.Select Channel Configuration
Table 9-15.Selecting or Aborting Computer Control
Table 9-16.Setting Up "OPEN" Analysis Points Using Distance
Table 9-17.Select Metric Units of Measure
Table 9-18.Setting the Clock and Calendar
Table 9-19.Programming a Slow-Close Test
Table 9-20.Performing a Transducer Self Test
Table 9-21.Checking the Cable Hookup
Table 9-22.Automatic Print Setting

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MODEL CT-7500 OPERATING INSTRUCTIONS

MODEL CT-7500 OPERATING INSTRUCTIONS

1.0 Introduction

The Model CT-7500 is a microprocessor-based digital time-versus-travel Circuit Breaker
Analyzer with a special on line test mode. This on line test mode (Quick-Shot mode) allows the
user to capture breaker contact close time and contact open (clear) time while the breaker is still in
service. In the off line test, the Model CT-7500 fully analyzes utility circuit-breaker performance:
contact time, stroke, velocity, over-travel, bounce-back, and contact wipe.

Contact-motion analysis includes: Open, Close, Open-Close, Close-Open, and Open-Close­Open. A timing window is selectable between 1-second or 10-second periods. The 10-second
window allows timing of long events (e.g., circuit switcher contacts).

The CT-7500 is available in three models:

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CT-7500-3; three contact channels.

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CT-7500-6; six contact channels.

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CT-7500-12; twelve contact channels.

All the CT-7500 models have the following input:

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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.

There are two modes of operation for the CT-7500: Stand Alone Mode and Computer Control
Mode. This manual will focus on the CT-7500 Stand Alone Mode. The Computer Control Mode is
covered under the CT-7500 PC software manual.

2.0 CT-7500 Description

2.1 On-line Timing (Quick-Shot) mode

A clamp-on AC current probe connected to the breaker bushing CT lets the CT-7500
measure breaker switching time (while the breaker’s still in service). The CT-7500 can time an
OPEN operation by sensing the time when the OPEN coil is energized until the bushing CT
current returns to zero. CLOSE time is detected when the close coil is energized until the bushing
CT current is detected.
This “Quick-Shot” mode provides a quick way to diagnose breaker performance and savings in
maintenance cost.

2.2 Time-Versus-Travel Circuit Breaker Analyzer Mode

The CT-7500 applies a 35Vdc voltage to each of the contact channels. This test voltage is
sensed by an analog to digital converter (A/D) to determine the state of the contact (close, or
open, or insertion resistor). The CT-7500 records the A/D reading at a 10 KHz rate, and stores
these readings in memory. The contact/resistor time is then derived from data stored in memory.

The CT-7500 uses three up-down counters to sense the breaker’s transducer reading. The
CT-7500 travel transducer employs an optical encoder to send quadrature signals to the CT­7500’s counters. With the use of the digital transducer and counters, the user never has to set up

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MODEL CT-7500 OPERATING INSTRUCTIONS

or calibrate the transducer.

The CT-7500 has a built-in initiate circuit to operate circuit breakers. Since this solid-state
circuit is controlled by the micro-processor, the CT-7500 can perform multiple operations (O-C, C­O, O-C-O) with ease. Each Trip and Close initiate circuit is fuse protected. The user is also
required to hold the “ARM” switch during a test to complete the initiate circuit.

The CT-7500 can also store up to 200 breaker-timing test records and 45 breaker test-plans in
FLASH EEPROM. Stored timing test records can be recalled and printed or transferred to the PC.
Using the breaker test plan during a test, the users do not have to set the velocity calculating
points. The CT-7500 will also print “PASS” and “FAIL” results on test report.

2.2.1 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 insertion resistor contacts times (in millisecond and cycles).

Note

The CT-7500 can detect insertion resistors in a 10-7000 ohm range. Resistances over 7000
ohms are detected as an open contact.

2.2.2 Analog Voltage Monitoring Channel

An analog voltage input is dedicated to monitoring a breaker's dc power supply or coil voltages

(0-255 V dc or peak ac).

Note

Input voltage range is 0-300Vdc or peak AC. Reading range is 0-255Vdc.

2.2.3 Digital Voltage Monitoring Channel

One digital voltage input channel monitors voltage on/off status. Voltage threshold from 30-255
Vdc is considered as “ON” status. Voltage threshold less than 30 Vdc is considered as “OFF”
status.

2.2.4 Trip/Close Current Monitoring

A built-in Hall-effect sensor records Trip and Close coil current levels and duration. The
breaker's operate coil current waveform is graphically plotted on a printout. Current reading is also
printed in the tabulated report.

2.2.5 Travel Transducer Input Channels

Each CT-7500 has 3 digital transducer input channels. These transducer channels require
neither setup nor calibration.

2.2.6 Breaker Initiate Capability

A built-in solid-state initiate device lets users operate a breaker from the CT-7500. Operational
modes include: Open, Close, Open-Close, Close-Open, Open-Close-Open. Multiple operations

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MODEL CT-7500 OPERATING INSTRUCTIONS

(e.g., Open-Close, Close-Open, Open-Close-Open) can be initiated with a programmable delay
time or by sensing the breaker's contact state.

Because solid-state switching is used in the initiate circuitry, the CT-7500 can switch a
breaker's ac or dc control circuit. Each trip and close circuit is protected by a 3-ampere fuse. The
initiate circuit is also protected by an interlock "ARM" switch.

2.2.7 Built-in Thermal Printer

A 4.5-inch wide thermal printer prints the breaker's contact analysis results in both tabular and
graphic formats.

2.2.8 Printer Port

A parallel printer port can drive a H-P color ink-jet printer, from which a color graphic of timing
charts and tabulated results can be printed on 8½-11-inch paper.

An Ink-Jet printer is supplied with each CT-7500.

2.2.9 Computer Interface Capabilities

A built-in RS-232C port lets timing shots stored in CT-7500 EEPROMs to be down-loaded to an
IBM-compatible PC. Windows-based (Windows 95, Windows 98, Windows Me, Windows 2000,
and Windows NT) Breaker Analysis Software is supplied with the CT-7500. This software allows
the user to:

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Time Circuit breakers from a PC.

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Retrieve timing shots stored in CT-7500.

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Recall timing shots from a hard drive for re-analysis (at an office PC).

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Create breaker test plans on a PC and load into the CT-7500.

2.2.10 Timing Shots Storage Capabilities

The CT-7500 uses Electrical Erasable PROMs (EEPROM) to store timing-shot data. Unlike
other media, EEPROMs are immune to temperature, shock, and humidity. Stored shots can be
recalled to reanalyze test data, to re-print test reports, or transfer data to an IBM compatible PC
for record keeping. Up to 200 timing shots can be stored in the EEPROMs. The number of shots
stored in EEPROMs can vary, depending on the size of the shot records.

2.2.11 Breaker Test Plan Storage Abilities

Up to 45 breaker’s test plans can be stored in the CT-7500. Test plans comprise breaker
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). Breaker specifications need not be referenced to compare
test results to determine if a breaker passed.

A breaker test plan can be created by using the Breaker Analysis Software (supplied with each
CT-7500). The test plan is then loaded into the CT-7500 via an RS-232C serial port.

2.2.12 Diagnostic Capabilities

The CT-7500 can run diagnostics on its own electronics. Self-testing of contact cable hook-ups
and transducers lets users checkout CT-7500 accessories whenever verification is required.

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MODEL CT-7500 OPERATING INSTRUCTIONS

2.2.13 CT-7500 Display and Control Switches

An alpha-numeric keypad lets the user enter breaker’s name plate data (Substation name,
Breaker Model, etc) and control function. A 4-line by 20-character LCD readout displays user
messages. The LCD is back lighted so messages can be viewed in low light levels.

3.0 Test Result Tabulation

3.1 Electrical Measurement Results

Each CT-7500 contact channel provides the following test results:

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Contact Close time, (Quick-Shot) Mode.

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Contact Open (Clear) time, (Quick-Shot) Mode.

The CT-7500 can detect insertion resistors in a 10-7000 ohm range. Resistances over 7000
ohms are detected as an open contact.

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Main contact and insertion resistor contact times (Time-Travel Test).

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Contact bounce time (Time-Travel Test).

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Contact spread time (Time-Travel Test).

NOTE

3.2 Mechanical Measurement Results

Each digital transducer channel provides the following test results:

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Breaker stroke (Time-Travel Test).

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Over travel (Time-Travel Test).

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Bounce back (Time-Travel Test).

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Contact wipe (Time-Travel Test).

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Velocity (Time-Travel Test).

Breaker contact speed calculation is based on a contact's travel distance over a period of time,

which is defined by the manufacturer's specifications.

A CT-7500 not only calculates simple distance-over-time speeds, but can also support other

formulas. An example is Siemen TCP breaker calculation formula:

V=12.2 x a/b

The formula and analysis points can be stored in a test plan for use later in the field.

NOTE

If operators use a breaker test plan (see paragraph 9.8) 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
operation. Printed voltage readings include nominal voltage (supply voltage at no load) and
minimum voltage (supply voltage under load or when a coil is energized).
This connection allows the user to monitor the DC power supply voltage fluctuation during
breaker’s operation. This feature is handy to detect breaker’s power supply problem; which

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MODEL CT-7500 OPERATING INSTRUCTIONS

normally can not be seen using a volt meter.

NOTE

Voltage reading range is 1.0-255 V dc.

3.4 Digital Voltage Input Results

The Digital Voltage Input channel (V2) monitors voltage on/off conditions and graphs the result.
A voltage level above 30Vdc is considered as “ON” condition. This input channel is dedicated to
monitor breaker’s auxiliary switch action during breaker’s operation.

NOTE

Input voltage range is 1.0-300 V ac/dc.

3.5 Initiate Current Results

The CT-7500 not only plots Trip or Close current waveforms, but also prints steady-state
current readings of trip and close coils during operation.

NOTE

1. If the CT-7500 initiates the OPEN test or CLOSE test under the Quick-Shot test, the test report
will show OPEN or CLOSE coil current reading and current wave form.

2. If the user operates the breaker for the Quick-Shot test (external trigger), no coil current reading
or waveform will be recorded.

3.6 Slow-Close Test

A slow-close test finds the contact touch distance and penetration by using the travel
transducer and dry contact channels.

4.0 Test-Results Graphics

4.1 Thermal Printer Graphic Printout

A 4.5” wide built-in thermal printer prints graphic waveforms of contact channels, travel curves,
and actuator-coil currents. With a zoom graphics mode, the user can select an enlargement by
specifying the timing zone.

4.2 Ink-Jet Printer Output

A color graphic report can be printed on the HP Ink-jet printer (supplied with each CT-7500).
The CT-7500 will print color graphics of contact channels, travel channels, current waveforms on
8½- by 11-inch paper.

5.0 Controls and Display

(See Figure 5-1 and Table 5-1.)

Before using the CT-7500 Analyzer, users should become familiar with all of its controls and
display indications. The keypad and display are used to operate the CT-7500 Analyzer. Figure 5­1 shows the control panel and numbered lines pointing to each control and indicator. The line
numbers refer to Table 5-1, which describes the function of each control and indication.

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Figure 5-1. CT-7500 Control Panel

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Table 5-1. Model CT-7500 Controls and Displays

Fig. 5-1
Index no. PANEL MARKING

FUNCTIONAL DESCRIPTION

1

2

3

4

5

6

7

8

9

CONTACT INPUT (1-12) Connector, 3-pin: each input is a continuity (dry)

sensor for detecting a contact closing or opening (a
timing input to the processor).

(30V-300V) VOLTAGE

V1 & V2/ VOLTAGE INPUT

TRIGGER/VOLTAGE INPUT Connector, 3-pin: input (30-300 Vac, dc, or peak)

CT AC current sensor input channel.

AC 100-240V; 5A MAX Power plug (3-wire), ac fuse, ON/OFF switch: Switch

GROUND Stud, 5/16-18 threads, with wing nut; safety ground

TRANSDUCER INPUT

(T1, T2, T3)

(Printer; No panel marking) Thermal printer; prints on specially treated 4½-inch

PRINTER Printer port connector, 25-pin.

Connector, 3-pin: each input is a voltage detector for
timing voltage (30-300 V dc/peak) of trip or close coil
switching (active period).

triggers timing functions.

is 2-pole rocker, input power on & off.

terminal.

Connector, 16-pin: each input (T1-T3) is a Travel
Encoder output (contact motion data).

wide paper; processor controlled.

10

11

12

13

14

15

1-9, 0, ENTER, START, STOP,
CLEAR, ↑ PAPER LCD,

PAPER LCD

↓

REMOTE ARM SWITCH Remote Arm Switch connector. The remote Arm

"PUSH" TO ARM Pushbutton switch, spring-loaded: press & hold to

(Display; no panel marking) Liquid-Crystal Display (LCD), back lighted: 4-line by

CLOSE/ 3 A Close circuit fuse (3 amperes).

OPEN/ 3 A Open circuit fuse (3 amperes).

Keypad, 16-key; keys are momentary-contact
pushbutton switches: makes menu selections, enters
alpha-numeric data, adjusts LCD contrast, and
moves paper.

switch with a 15ft cable is provided with each CT-

7500.

complete trip & close circuits for breaker tests.

20 characters per line: displays menus, options,
prompts, and test-result data.

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Table 5-1. Model CT-7500 Controls and Displays (cont’)

Fig. 5-1
Index no. PANEL MARKING

FUNCTIONAL DESCRIPTION

16

17

INITIATE Connector, 4-pin; switching circuit for operating the

circuit breaker being tested.

RS-232C Connector, 9-pin:RS-232C computer interface.

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6.0 CT-7500 Analyzer Specifications

CONTACT TIMING

SIZE & WEIGHT

OPERATING POWER

AC CURRENT SENSOR

DRY-CONTACT INPUTS

TIMING WINDOW

RESOLUTION

DRY-CONTACT
CHANNEL PROTECTION

CONTACT RESISTANCE

INSERTION RESISTANCE

TRIGGER INPUT

Open, Close, Open-Close, Close-Open, and Open-Close-Open

16d by 14w by 11h (inches); Less than 32 pounds

3 amps, 90-120Vac/200-240Vac 50/60 Hz

0-25 Ampere, non-contact AC current sensor

3, 6, or 12 dry-input channels; Each detects Main & Insertion-Resistor contacts

Selectable: 1 second or 10 seconds

± 100 microseconds at 1-second duration; ±1.0 millisecond at 10-seconds duration

Fuses protect all isolated power supplies; All contact inputs are grounded until test;

Inputs are MOV protected

CLOSED: <20 ohms; OPEN: >10,000 ohms

Range: 10 to 7,000 ohms

Open/Close: 30 to 300 volts, dc or peak ac

(See table below.)

VOLTAGE INPUTS

CURRENT-SENSOR INPUT

BREAKER INITIATE

TRAVEL TRANSDUCERS

CONTACT TRAVEL
POINT DIFFERENCE

BREAKER ANALYSIS

display,

SOFTWARE (included)

COMPUTER INTERFACE

DISPLAY

HARD-COPY PRINTOUT

COLOR PRINTER

Two: 1.0-300 volts, dc/peak ac; analog voltage recording 1.0-255 V dc

One: Non-contact, Hall-Effect sensor, 0.2 to 25 amp ranges, dc to 5 kHz

Initiate Open, Close, Open-Close, Close-Open, Open-Close-Open

3 travel-transducer channels; Linear motion: 0.0-60.0 (±0.01) inches;
Rotary Range: 0-360o (± 0.36

Measures"Slow-Close" contact point distance (Hard Copy)

Analysis software runs on IBM-compatible. Software package for graphic

numerical reports, and database utility for shop or office

RS-232C Port

Back-lighted LCD screen: 4 lines by 20 characters, sunlight viewable

Contact travel waveforms & tabulated results print on 4.5-inch thermal paper

Built-in parallel printer port. CT-7500 produces both graphic and tabulated test
results in color on 8.5 by 11 (inches) paper via external ink-jet printer

o)

CARRYING CASE (optional)

Hard shipping case for both CT-7500 and Travel Transducer

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WARRANTY

One year warranty on parts and labor; post-warranty service contracts available

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7.0 CT-7500 Special Features

7.1 CT-7500 Operating Voltages

The CT-7500 operating voltage is selectable between 110/120 V, 50/60 Hz or 220/240 V,
50/60 Hz. Voltage selection is set by one jumper/connector on the Initiate PCB (JP3) and one
jumper/connector on the Power Supply PCB (JP1). Jumper setting for both connectors is shown
in table 7-1.

Table 7-1. Voltage Selection Jumper Setting

VOLTAGE SELECTION CONNECTOR PIN

110/120 Vac Pin 1& 2, 3 & 4
220/240 Vac Pin 2 & 3

Note:

Operating voltage is set from the factory.

7.2 CT-7500 Main Power Fuse

The CT-7500 uses an AC input module containing the AC receptacle, Power switch, and
Protective fuse. Replacement fuse should be: 20mm, 2A-250Vac slow blow.

7.3 CT-7500 Printer and Printer Paper

The CT-7500 built-in thermal printer uses 4.5-inch wide thermal paper for printing test
results. To maintain the highest quality test-result printing and to avoid paper jamming, the use
of paper supplied by our factory is highly recommended. 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

OR

BG Instrument Co.

13607 E. Trent Avenue

Spokane, WA 99216

Tel: [phone]

Fax: [phone]

Part Number: TP4 paper

7.4 CT-7500 Printer Paper Control

To advance paper from the printer, press and release the “↑ PAPER LCD” switch; to

retract the paper from the printer, press and release “↓ PAPER LCD” switch.

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7.5 Replacing CT-7500 Thermal Paper

The thermal paper roll is residing in the pocket under the printer cover. To replace the
thermal paper roll, follow these steps:



Remove printer cover.



Remove leftover thermal paper roll from paper holder.



Unroll new thermal paper roll.



Feed thermal paper into the slot between the paper pocket and roller.

The printer will pull paper under the thermal head.



Roll thermal paper roll and place this paper roll in paper holder.



Lift thermal head and align thermal paper if necessary.



Reinstall printer cover.

Note

Thermal paper will show a red stripe to indicate “Close to End of Paper”.

7.6 CT-7500 LCD Contrast Control

To Darken the LCD display, press and hold the “↑ PAPER LCD” switch for two seconds; to
lighten the LCD display, press and hold the “↓ PAPER LCD” switch for two seconds.

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8.0 TEST HOOKUP CONNECTIONS

8.1 Contact Cable Hookup

A typical contact cable connection to a circuit breaker is shown in Figure 8-1.

NOTE

It is advisable to ground one side of the contacts for most testing. If a breaker is floating
(i.e., ungrounded), ensure contact-channel inputs are protected against static discharge.

A typical series contact connection is shown in Figure 8-2.

8.2 Initiate Cable Hookup

A CT-7500 will trip or close breakers with a solid-state device, which will operate on any ac or
dc control voltage from 10 to 300 volts. Both the trip and close circuits are protected by 3-ampere
fuses.

A typical dc trip and dc close control circuit test hookup is shown in Figure 8-3.

A typical dc trip and ac close control circuit is shown in Figure 8-4.

8.3 Analog Voltage Monitor Hookup

The analog voltage input (V1) lets users monitor a breaker's dc-control voltage during
operation. The analog voltage input (V1) will record the norminal dc voltage (at no load) and the
minimum dc voltage (while the Trip or Close coil is energized).

Nominal and minimum voltage readings will print on a tabulated report. Analog waveform will
also plot in a graphic report. This lets the user see the breaker's dc control voltage "dip" under
load. Problems, such as a poor connection or an excessive voltage drop, during operation can
thus be easily detected.

A typical voltage monitoring hook up is shown on Figure 8.5.

NOTE

Maximum voltage recorded is 255 Vdc.

8.4 Digital Voltage Monitor Hookup

The Digital V2 voltage input channel lets users monitor the voltage ON/OFF state. The voltage
ON/OFF state will be plotted on the graphic report. A typical hook up is shown on Figure 8.5.

8.5 External Trigger Input

External trigger mode lets a user start a recording when the CT-7500 senses a voltage. A
typical application for this external trigger mode is to time a circuit breaker in a close operation and
to start timing only when the close coil is energized (bypassing the 52X relay delay time).
Since the 52X relay carries the close coil current, the user wants to connect the CT-7500’s initiate
cable to the close terminal (figure 8-4). The CT-7500 will energize the 52X relay to start the close
operation. The CT-7500 then will start the timing when it senses the voltage across the closing
coil. See Figure 8.6 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.

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NOTE

Minimum trigger voltage is set for 30 V ac/dc. Maximum continous voltage is 300Vac/dc.

Different trigger voltages can be set at the factory, based on specific requests from users.

The CT-7500 will start looking for the external trigger input voltage after the CT-7500 Initiate

Sequence is completed (CT-7500 stops beeping after the user presses “START” key) and

message “LOOKING FOR TRIGGER VOLTAGE” is shown on LCD.

This external trigger voltage needs to be sensed by the CT-7500 within 5 second after the

Initiate sequence. The CT-7500 will return to main menu if no voltage is sensed.

8.6 AC Current Sensor Hookup

A clamp-on AC current sensor connecting to the breaker bushing CT allows the CT-7500 to
sense breaker bushing current. The AC current sensor requires a 100mA current to operate.
Maximum current is 25 amperes. Typical hookup is shown on figure 8-8.

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Figure 8-1. Typical Single Break Contact Cable Hookup

Figure 8-2. Typical Series Contacts Test Cable Hookup

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Firgure 8-3. Typical DC Trip and Close Control Test Cable Hookup

Figure 8-4. Typical DC Trip and AC Close Control Test Cable Hookup

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Figure 8-5. Typical Voltage-Monitoring Test Cable Hookup

Figure 8-6. Typical External Trigger Hookup

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Figure 8-7. Transducer Cable Hookup

Figure 8-8. AC Current Sensor Hookup

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9.0 OPERATING PROCEDURES

The main steps to time a circuit breaker are listed below (Figure 9-0). Figure 9-1 is a user's
"map" of all menus for operating a CT-7500.

HOOKUP CT-7500

1. GROUND CT-7500 (See note)

2. CONNECT CT-7500 CABLES TO BREAKER

3. INSTALL TRANSDUCER

APPLY POWER

1. TURN CT-7500 POWER ON

2. PERFORM SELF TEST (HOOK-UP TEST,
CABLE TEST)

TIMER BREAKER

1. SELECT CT-7500 TEST

2. OPERATE BREAKER

GET RESULTS

1. GET TABULATED RESULTS

2. GET GRAPHIC RESULTS

Figure 9-0. CT-7500 Operating Steps

Note

To reduce the possibility of damaging the CT-7500 contact channels by static discharge in the
high voltage substation, we recommend the user to ground one side of the breaker’s bushings.

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Figure 9-1 CT-7500 Menu Map

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Figure 9-1 CT-7500 Menu Map

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9.1 Timing A Circuit Breaker

Timing Breaker Under Quick-Shot Mode.

The CT-7500 will provide OPEN or CLOSE time only under the Quick-Shot mode. The user
can have the CT-7500 to initiate the OPEN or CLOSE test, in this case the test report will show
OPEN or CLOSE coil current reading and current wave form.

If the user operates the breaker for the Quick-Shot test (using External Trigger), no coil current
reading or wave form will be recorded.

Timing Breaker Under Time-Travel Mode

The CT-7500 will initiate the breaker operation and do a timing test on the following operations:



OPEN



CLOSE



OPEN-CLOSE



CLOSE-OPEN



OPEN-CLOSE-OPEN

Note

1. The CT-7500 can start OPEN-CLOSE operations, using a programmable delay (between

OPEN and CLOSE commands) or no delay.

2.The CLOSE-OPEN can be started by the CT-7500, using several options:



Contact #1 Close:
CT-7500 initiates a CLOSE command then OPEN command after detecting circuit
breaker’s contact closed. The CT-7500 detects breaker contact closed through contact
channel #1.



Set DELAY:
CT-7500 initiates a CLOSE command then OPEN command after a programmable
delay (from a CLOSE command).



No DELAY:
CT-7500 initiates a CLOSE command and OPEN command together. Since the circuit

breaker is in the open state, the circuit breaker 52B contact allows the close coil to be
energized to start the close command. When the circuit breaker is making the transition
from open state to close state, the 52A contact will close allowing the breaker to initiate
the open command.

3.The OPEN-CLOSE-OPEN operations can be initiated by the CT-7500, using a programmable
delay between each of the operations (e.g., delays between OPEN to CLOSE and between
CLOSE to OPEN).

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9.1.1 Timing an OPEN Operation With No Insertion Resistor

Table 9-1. Open Operation With No Resistor

STEP

1 READY TIMER FOR BREAKER OPERATION. PRESS #1 KEY. INSERTION RESISTOR?

2 SELECT NO INSERTION RESISTOR. PRESS #1 KEY. TIMING WINDOWS:

3 SELECT 1-SECOND WINDOW. PRESS #1 KEY. 1.INTERNAL TRIGGER

4 SELECT INTERNAL TRIGGER. PRESS #1 KEY. TIMING MODE:

5 SELECT OPEN OPERATION. PRESS KEY #1. OPEN TIMING

6 INITIATE OPEN COMMAND. HOLD "ARM" KEY AND

OPERATION

ACTION DISPLAY

1.NO

2.YES

1.WINDOW = 1 SECOND

2.WINDOW = 10 SECONDS

2.EXTERNAL TRIGGER

1. OPEN 2. CLOSE

3. O-C 4. C-0

5. O-C-O

Hold "ARM" Switch,

Then "START".

"STOP" to ABORT

TEST IN PROGRESS

PRESS "START" KEY.

Hold "ARM" Until

Test complete.

(Up to 15 seconds)

7 ANALYZER IS READY TO OUTPUT RESULTS. NONE. 1.TIME BREAKER

2.GET RESULT

3.SET-UP

4.DIAGNOSTIC

Note

One-second timing windows are used for breaker timing; 10-second timing windows are used
for circuit-switcher timing.

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9.1.2 Timing an OPEN Operation With Insertion Resistors

The CT-7500 can time breakers with insertion resistors. The insertion resistor range is 10 to
7000 ohms. Any insertion resistor more than 7,000 ohms is detected as open circuit. Timing
window results will show main contact timing and insertion resistor contact timing. Graphic reports
show main contact and resistor contact activities on each of the channels.

Table 9-2. Open Operation With Insertion Resistor

STEP OPERATION ACTION DISPLAY

1 READY TIMER FOR BREAKER OPERATION. PRESS #1 KEY. INSERTION RESISTOR?

1.NO

2.YES

2 SELECT INSERTION RESISTOR. PRESS #2 KEY. TIMING WINDOWS:

1.WINDOW = 1 SECOND

2.WINDOW = 10 SECONDS

3 SELECT 1-SECOND WINDOW. PRESS #1 KEY. 1.INTERNAL TRIGGER

2.EXTERNAL TRIGGER

4 SELECT INTERNAL TRIGGER. PRESS #1 KEY. TIMING MODE:

1. OPEN 2. CLOSE

3. O-C 4. C-0

5. O-C-O

5 SELECT OPEN OPERATION. PRESS KEY #1. OPEN TIMING

Hold "ARM" Switch,

Then "START".

"STOP" to ABORT

6 INITIATE OPEN COMMAND. HOLD "ARM" KEY AND

PRESS "START" KEY.

7 ANALYZER IS READY TO OUTPUT RESULTS. NONE. 1.TIME BREAKER

TEST IN PROGRESS

Hold "ARM" Until

Test complete.

(Up to 15 seconds)

2.GET RESULT

3.SET-UP

4.DIAGNOSTIC

Note

The User can set the CT-7500 to print tabulated and graphic reports automatically after it
completes a test. See section 9-21 for automatic print setting.

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9.1.3 Timing CLOSE-OPEN Operation Using Contact Channel #1

The CLOSE-OPEN operation of the breaker simulates a condition where a breaker is closed on
a fault. The CT-7500 first initiates a CLOSE command then sends an OPEN command only when
it detects that main contact #1 is closed. This mode truly simulates the breaker closing into a fault
condition in the field.

Table 9-3. Close-Open Operation with No Resistor

STEP OPERATION ACTION DISPLAY

1 READY TIMER FOR BREAKER OPERATION. PRESS #1 KEY. INSERTION RESISTOR?

1.NO

2.YES

2 SELECT NO INSERTION RESISTOR. PRESS #1 KEY. TIMING WINDOWS:

1.WINDOW = 1 SECOND

2.WINDOW = 10 SECONDS

3 SELECT 1-SECOND WINDOW. PRESS #1 KEY. 1.INTERNAL TRIGGER

2.EXTERNAL TRIGGER

4 SELECT INTERNAL TRIGGER. PRESS #1 KEY. TIMING MODE:

1. OPEN 2. CLOSE

3. O-C 4. C-0

5. O-C-O

5 SELECT CLOSE-OPEN OPERATION. PRESS #4 KEY. C-O SECOND TRIGGER

1. CONTACT #1 CLOSE

2. SET DELAY

3. NO DELAY

6 SELECT CONTACT #1 CLOSE. PRES #1 KEY. CLOSE-OPEN TIMING

Hold "ARM" Switch,

Then "START".

"STOP" to ABORT

7 INITIATE OPEN COMMAND. HOLD "ARM" KEY AND

PRESS "START" KEY.

8 ANALYZER IS READY TO OUTPUT RESULTS. NONE. 1.TIME BREAKER

TEST IN PROGRESS

Hold "ARM" Until

Test complete.

(Up to 15 seconds)

2.GET RESULT

3.SET-UP

4.DIAGNOSTIC.

Note

1. Users can program a delay from 10 to 500 ms between the CLOSE and OPEN commands.
When a delay is used in this operation, it may not represent a true breaker condition.

2. Users can also program in no delay for this operation, in which case, the CLOSE and OPEN

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commands are initiated at the same time. The breaker will start closing, the

OPEN circuit

is

then enabled (by the A/B switch) allowing the OPEN operation.

9.2 Get Tabulated Timing Results Using Thermal Printer

Table 9-4. Get Tabulated Results

STEP OPERATION ACTION DISPLAY

1 GET TIMING RESULTS. PRESS #1 KEY. 1.PRINT TEST RESULTS

2.PLOT FULL CHART

3.PLOT EXPANSION

4.PLOT 0-200 MS

2 PRINT TABULATED RESULTS. PRESS #1 KEY. SELECT PRINTER

1. INTERNAL THERMAL

2. EXTERNAL INKJET

3 OUTPUT TABULATED RESULTS ON

THERMAL PRINTER.

PRESS #1 KEY. 1. PRINT TEST RESULTS

2. PLOT FULL CHART

3. PLOT EXPANSION

4. PLOT 0-200 MS

Note

To get a tabulated report on the ink-jet printer, press key #2 in step #2. Ensure the ink-jet printer
is connected to the CT-7500 for this report.

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Figure 9-2. Typical Tabulated Printout of Open Operation on Thermal Printer

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Note

1. Contact time is shown in both millisecond and cycles. From figure 9-2, contact channel #1 time
is 181.50 ms or 10.89 cycles.

2. Contact bounce duration is 1.70 ms

3. Contact wipe is measured as .77 inch.

4. The slowest contact and fastest contact differential time is shown as contact delta:0.10 ms.

5. AC current sensor time is shown as CT Channel Analysis time in millisecond cycles. The CT
time is shown as 184.70ms or 11.08 cycles.
Since this print out was generated to show both Quick-Shot mode and Time-Travel mode; both
CT time and contact-travel readings are shown on this report.

6. Breaker contact stroke is 7.08 inches.

7. Contact velocity calculation is 5.72 feet per second.

8. Contact over-travel distance is 0.29 inch.

9. Contact bounce-back distance is 0.16 inch.

10. Contact velocity calculation is from the 2 analysis points:

Analysis point # 1 is 1.00 inch from fully closed position.

Analysis point # 2 is 5.00 inches from fully closed position.

11. The DC power supply was monitored during test. The nominal voltage is 52V and the
minimum is 37 V.

12. Initiate current is 5.1 amperes.

13. Timing shot duration is 1 second.

14. There is no insertion resistor in this test (no insertion resistor time is measured).

15. Trigger mode is internal (timing window starts at the same time the CT-7500 energized the
circuit breaker).

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Pass/Fail on Contact
Parameters

Pass/Fail on Travel
Parameters

Figure 9-3. Typical tabulated Printout of an Open Operation on Ink-jet Printer.

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9.3 Get Graphic Timing Results Using Thermal Printer

Table 9-5. Plot Chart and Tabulated Report

STEP OPERATION ACTION DISPLAY

1 GET TIMING RESULTS. PRESS #2 KEY. 1 PRINT TEST RESULTS

2 PLOT FULL CHART

3 PLOT EXPANSION

4 PLOT 0-200 MS

2 PLOT FULL CHART. PRESS #2 KEY. SELECT PRINTER

1. INTERNAL THERMAL

2. EXTERNAL INKJET

3 PRINT CHART ON THERMAL PAPER. PRESS #1 KEY. PLEASE WAIT

PLOTTING GRAPH

4 RETURN TO MAIN MENU AFTER

PRINT CHART.

NO ACTION. 1. TIME BRKR

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

Note

1. Figure 9-4 shows a timing chart of a circuit breaker with contact activity on channel 1 and 3. A
CT channel is also shown on this chart. Since this print out was generated to show both Quick­Shot mode and Time-Travel mode; both CT time and contact-travel readings are shown on this
chart.

2. To get a graphic report on the ink-jet color printer, press key #2 in step # 2.

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g

yp

p

Contact Trace

Travel Trace

Initiate Current Trace

AC Current Sensor

Digital Voltage Channel V2

Analog Voltage Channel V1

hic Result on Thermal Printer

ical Gra

ure 9-4. T
Fi

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Figure 9-5. Typical Graphic Report on Ink-Jet Printer

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Analysis Point #1

Analysis Point #2

Figure 9-6. Expansion Graph from 0ms to 200ms on Thermal Printer

Note

Analysis point # 1 and point #2 is shown on chart.

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Figure 9-7. Open Timing Shot Graphics Interpretation

Figure 9-7A. Close Timing Shot Graphics Interpretation

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Figure 9-8. Open-Close and Close-Open Timing Shot Graphics Interpretation

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9.4 Save Timing Shot in EEPROM

Table 9-6. Save Timing Shot In EEPROM

STEP OPERATION ACTION DISPLAY

1 SELECT SAVE/RECALL MENU. PRESS #3 KEY. 1 ANALYSIS POINTS

2 MEASUREMENT UNITS

3 SAVE / RESTORE

4 NEXT PAGE

2 SELECT SAVE MENU. PRESS #3 KEY. 1. SAVE SHOT

2. RECALL SHOT

3. SHOT DIRECTORY

4. ERASE SHOT

3 SELECT SAVE SHOT. PRESS #1 KEY. SAVE SHOT # XXXX

TEST: CLOSE

DATE: MM/DD/YY HH:MM

"ENTER" TO CONFIRM

4 CONFIRM SAVING SHOT. PRESS "ENTER"

KEY.

5 RETURN TO MAIN MENU. PRESS ANY KEY. 1. TIME BRKR

SAVE IN PROCESS

PLEASE WAIT

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

Notes

Timing shot storage capability varies, depending upon the size of the shots.

The CT-7500 will assign an ID for each of the shots stored in EEPROM.

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9.5 Print EEPROM Timing Shot Directory

Table 9-7. Print Timing Shot Directory

STEP OPERATION ACTION DISPLAY

SELECT SAVE / RESTORE MENU.

1

2 SELECT SHOT DIRECTORY MENU. PRESS #3 KEY. 1. SAVE SHOT

3 SELECT SHORT DIRECTORY. PRESS # 1 KEY. 1. SHORT DIRECTORY

4 PRINT SHOT DIRECTORY NOW. NO ACTION. PRINTING ABBREVIATED

PRESS #3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2. RESTORE SHOT

3. SHOT DIRECTORY

4. ERASE SHOT

2. FULL DIRECTORY

"STOP" TO QUIT

DIRECTORY

"STOP" TO QUIT

5 RETURN TO MAIN DIRECTORY. NO ACTION. 1. TIME BRKR

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

Note

1. The CT-7500 will print out shot IDs of 10 last timing shots stored in EEPROM when "Short
Directory" is selected.

2. The CT-7500 will print out shot IDs of all timing shots stored in EEPROM if "Full Directory" is
selected.

A typical shot directory print out is shown on next page.

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Figure 9-9. Timing Shot Directory Printout On Thermal Printer

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9.6 Recall a Timing Shot

The following steps are used to recall a timing shot stored in EEPROM to working memory.
Once a timing shot is recalled, the user can ask for test results from the thermal printer or the
color ink-jet printer.

Table 9-8. Recall a Timing Shot

STEP OPERATION ACTION DISPLAY

1 SELECT SETUP MENU. PRESS #3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT SAVE/RESTORE SHOT. PRESS # 3 KEY. 1. SAVE SHOT

2. RESTORE SHOT

3. SHOT DIRECTORY

4. ERASE SHOT

3 SELECT RESTORE SHOT. PRESS #2 KEY. ENTER SHOT NUMBER TO BE RESTORED

xxxx

"ENTER" TO CONFIRM

4 ENTER SHOT NUMBER TO BE

RESTORED.

5 CONFIRM SHOT TO BE RESTORED. PRESS "ENTER"

6 RETURN TO MAIN MENU. PRESS ANY KEY. 1. TIME BRKR

PRESS KEY 0 TO 9

FOR SHOT ID THE

"ENTER" KEY.

KEY.

ENTER SHOT NUMBER TO BE RESTORED

XXXX

"ENTER" TO CONFIRM

RESTORING SHOT # XXXX

TEST: YYYY

DATE: MM\DD\YY HH:MM

"ENTER" TO CONFIRM

2. GET RSLT

3. SET UP

4. DIAGNOSTICS

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9.7 Deleting a Timing Shot

Users can delete a specific timing shot from the CT-7500 EEPROM memory by using the steps
described in the table below.

Table 9-9. Delete a Timing Shot

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS # 3 KEY. 1. ANALYSIS POINTS

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT SAVE / RESTORE MENU. PRESS # 3 KEY. 1. SAVE SHOT

2. RESTORE SHOT

3. SHOT DIRECTORY

4. ERASE SHOT

3 SELECT ERASE SHOT. PRESS # 4 KEY. ENTER SHOT NUMBER

TO BE ERASED

XXXX

"ENTER" TO CONFIRM

4 ENTER SHOT NUMBER. PRESS KEY 0-9 TO

SELECT SHOT

NUMBER, PRESS

"ENTER" TO

CONFIRM.

5 CONFIRM ERASE SHOT. PRESS "ENTER". ERASE IN PROCESS

6 WAIT FOR SHOT BEING ERASED. NO ACTION. ERASE COMPLETE

7 RETURN TO MAIN MENU. PRESS ANY KEY. 1. TIME BRKR

ERASE SHOT # XXXX

TEST: YYYY

DATE: MM\DD\YY HH:MM

"ENTER" TO CONFIRM

PLEASE WAIT

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

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9.8 Recall a Breaker Test Plan

A breaker test plan contains breaker maximum/minimum operating parameters. A typical list of
operating parameters is shown as follows:



Max/Min Contact/Resistor Trip Time.



Max/Min Contact/Resistor Close Time.



Max Contact Spread Time.



Max Resistor Contact Spread Time.



Max/Min Stroke.



Max/Min Trip Velocity.



Max/Min Close Velocity.



Max/Min Over Travel.



Max/Min Bounce Back.



Trip Analysis Points.



Close Analysis Points.

By recalling a Test Plan before testing, a user doesn't have to set analysis points to calculate
the Trip or Close velocity of the circuit-breaker contacts. Since a Test Plan contains other breaker
test parameters, the test report also displays a Pass/Fail status for each parameter tested.

Table 9-10. Recalling a Test Plan

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS #3 KEY. 1. ANALYSIS POINTS

2. MEASUREMENT UNIT

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT ANALYSIS MENU. PRES # 1 KEY. 1. OPEN TIMING

2. CLOSE TIMING

3. PRINT SETTING

4. TEST PLANS

3 SELECT TEST PLANS. PRESS # 4 KEY. 1. LOAD TEST PLAN

2. PRINT TEST PLAN

3. PRINT DIRECTORY

4 SELECT LOAD TEST PLAN. PRESS # 1 KEY. LOAD TEST PLAN

"UP" TO SCROLL

"ENTER" TO SELECT

5 VIEW TEST PLAN HEADER. PRESS UP ARROW

KEY TO SCROLL.

6 CONFIRM TEST PLAN TO BE

LOADED.

PRESS "ENTER"

KEY.

DISPLAY TEST PLAN HEADER

1. TEST BRKR

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

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9.9 Print a Breaker Test Plan

The user can print a breaker test plan stored in the CT-7500 EEPROM

Table 9-11. Print a Breaker Test Plan

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS # 3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT ANALYSIS POINTS. PRESS # 1 KEY. 1. OPEN TIMING

2. CLOSE TIMING

3. PRINT SETTINGS

4. TEST PLAN

3 SELECT TEST PLAN. PRESS # 4 KEY. 1. LOAD TEST PLAN

2. PRINT TEST PLAN

3. PRINT DIRECTORY

4 SELECT PRINT TEST PLAN. PRESS # 2 KEY. ENTER PLAN NUMBER

"ENTER" TO CONTINUE

5 ENTER PLAN NUMBER. PRESS # 0-9 KEY. ENTER PLAN NUMBER:

02

"ENTER" TO CONTINUE

6 CONFIRM TEST PLAN. PRESS “ENTER" KEY. SELECT PRINTER

1. INTERNAL THERMAL

2. EXTERNAL INK JET

7 PRINT ON THERMAL PRINTER. PRESS # 1 KEY. 1. TIMER BRKR

2. GET RESLT

3. SET UP

4. DIAGNOSTIC

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Figure 9-10. Typical Test-Plan Printout on Thermal Printer

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9.10 Print Breaker Test Plan Directory

The user can print a breaker test plan directory stored in the CT-7500 EEPROM using the
steps in table below:

Table 9-12. Print a Breaker Test Plan Directory

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS # 3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT ANALYSIS POINTS. PRESS # 1 KEY. 1. OPEN TIMING

2. CLOSE TIMING

3. PRINT SETTINGS

4. TEST PLAN

3 SELECT TEST PLAN. PRESS # 4 KEY. 1. LOAD TEST PLAN

2. PRINT TEST PLAN

3. PRINT DIRECTORY

4 SELECT PRINT TEST PLAN DIRECTORY. PRESS # 3 KEY. 1. TIMER BRKR

2. GET RESLT

3. SET UP

4. DIAGNOSTIC

Figure 9-11. Typical Test Plan Directory Printout.

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9.11 Shot Description

The CT-7500 lets users enter breaker and test data identification (ID). This data includes the
names of the company, station, circuit, and manufacturer, as well as the breaker's model and
serial number, and the operator's name. These ID data will print out on the header section of the
shot tabulated report.

If the user saves the timing shot, this data will also be saved with the timing shot and the time
and date.

The user selects the alpha-numeric entry by pressing the appropriate key: To select a letter "A,"
the user must press key #2 twice. To select letter "C," the user must press key #2 four times etc.

To move the cursor forward, use the UP ARROW key. To move cursor backwards, use the
DOWN ARROW key. Use the CLEAR key to enter a space.

Table 9-13. Entering Shot Identification Header

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS #3 KEY. 1. ANALYSIS POINTS

2. MEASUREMENT UNIT

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT NEXT PAGE. PRESS # 4 KEY. 1. SHOT DESCRIPTION

2. NUMBER OF CHANNELS

3. COMPUTER IF

4. SET CLOCK

3 SELECT SHOT DESCRIPTION. PRESS # 1 KEY. ENTER COMPANY NAME

XXXXXX

"ENTER" TO CONFIRM

4 ENTER COMPANY NAME. PRESS # 0-9 KEYS

PRESS "ENTER"

TO CONFIRM.

5 ENTER STATION NAME. PRESS # 0-9 KEYS

PRESS "ENTER"

TO CONFIRM.

6 ENTER CIRCUIT NAME. PRESS # 0-9 KEYS

PRESS "ENTER"

TO CONFIRM.

7 ENTER MANUFACTURER NAME. PRESS # 0-9 KEYS

PRESS "ENTER"

TO CONFIRM.

ENTER STATION NAME

XXXXXX

"ENTER" TO CONFIRM

ENTER CIRCUIT NAME

XXXXXX

"ENTER" TO CONFIRM

ENTER MANUFACTURER NAME

XXXXXX

"ENTER" TO CONFIRM

ENTER BREAKER MODEL

XXXXXX

"ENTER" TO CONFIRM

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Table 9-13. Entering Shot Identification Header (Con’t)

STEP OPERATION ACTION DISPLAY

8 ENTER SERIAL NUMBER. PRESS # 0-9 KEYS

PRESS "ENTER"

TO CONFIRM.

9 ENTER OPERATOR NAME. PRESS # 0-9 KEYS

PRESS "ENTER"

TO CONFIRM.

10 RETURN TO MAIN MENU. NO ACTION. 1. TIME BRKR

ENTER SERIAL NUMBER

XXXX

"ENTER" TO CONFIRM

ENTER OPERATOR NAME

XXXX

"ENTER" TO CONFIRM

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

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9.12 CT-7500 Channel Configuration

The CT-7500 is available with 3-, 6-, or 12- contact inputs. Under most common timing
conditions, the user needs to use only 3 contact timing channels and 1 travel transducer. There is
no need to print more than 3 timing channels and 1 transducer channel on the graphic and
tabulated report. The CT-7500 will always default to 3 contact channels (channel 1, 2, and 3) and
1 transducer channel (transducer channel #1) after power is applied to the unit. The user can
always turn on the rest of the timing channels and transducer channels by following steps shown
in table below:

Table 9-14. Select Channel Configuration

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS #3 KEY. 1. ANALYSIS POINTS

2. MEASUREMENT UNIT

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT NEXT PAGE. PRESS #4 KEY. 1. SHOT DESCRIPTION

2. NUMBER OF CHANNELS

3. COMPUTER IF

4. SET CLOCK

3 SELECT NUMBER OF CHANNEL. PRESS #2 KEY. NUMBER OF CHANNELS

1. 3 CONTACTS

2. 6 CONTACTS

3. 12 CONTACTS

SELECT 3 CHANNELS ,OR 6

4

CHANNELS, OR 12 CHANNELS.

5 SELECT 1 TRANSDUCER, OR 2, OR 3. PRESS # 1, OR 2, OR

PRESS # 1, OR 2, OR

3 KEY.

3 KEY.

1. TRANSDUCER 1

2. TRANSDUCER 1,2

3. TRANSDUCER 1,2,3

1. TIME BRKR

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

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9.13 Computer Interface

Each CT-7500 has an RS-232C port. A Breaker Analysis Software package (provided with the
CT-7500) allows an IBM PC to communicate with a CT-7500. This software (operating under
Windows 95, Windows 98, Windows Me, Windows 2000, and Windows NT environment) allows
users to upload timing shots stored in EEPROM to the IBM PC. From the user's IBM PC, the user
can now re-analyze breaker timing shots and output timing report through an office printer. Since
timing shots are stored in an office PC, users can create a data base of a breaker's timing history.

A breaker's test plan can also be downloaded and stored in the CT-7500 EEPROM. Up to 20
test plans can be stored in a CT-7500. Consult the CT-7500 software manual for further details.

Follow the steps in the Table 9-15 below to put the CT-7500 under computer control:

Table 9-15. Selecting or Aborting Computer Control

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS # 3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT NEXT PAGE. PRESS # 4 KEY. 1. SHOT DESCRIPTION

2. NUMBER OF CHANNELS

3. COMPUTER IF

4. CLOCK 5.PRINT

3 SELECT COMPUTER INTERFACE. PRESS # 3 KEY. COMPUTER IF MODE

"STOP" TO ABORT

Notes

1. An interconnect cable must be run between Timer's RS-232C port and a compatible IBM PC.

2. Refer to the Breaker timing software manual for the software to run on the IBM-compatible
computer.

3. The CT-7500's RS-232 connector pinout is in the chart at

the right:

4. The operator is required to put the CT-7500 under

PIN No. SIGNAL NAME

2 Tx

computer control before executing the PC program.

3 Rx

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9.14. Breaker Travel Analysis

The CT-7500 travel analysis includes breaker stroke, over-travel, bounce-back, and contact-

wipe distances, and contact velocity calculation.

9.14.1 Breaker Stroke

The CT-7500 uses a digital transducer to measure a breaker's contact stroke, over-travel, and
bounce-back. The digital transducer output is 200 counts per linear inch of travel; the resolution is
accurate to 1/200 inch. The output resolution is ±0.01 inch on the test result report.

Unlike slide-wire transducers, the CT-7500 transducer needs no calibration or setup. A user
verifies transducer function by selecting a diagnostic test for the transducer (paragraph 9.19).

9.14.2 Breaker Over-travel Distance

Over-travel is a distance the contact moves beyond the resting position. Over-travel is typically
found in the Close Operation.

9.14.3 Breaker Bounce-Back Distance.

Bounce-back is the distance the breaker contact moves before the resting position after over­travel. Again, bounce-back is typically found in the Close Operation.

9.14.4 Contact Wipe

.

Contact wipe is the distance measured from the close position to the contacts touching (or
parting). In the Close Operation, contact wipe is measured from the contacts touching position to
the final close position.

In the Open Operation, contact wipe is measured from the close position to contact break (or
parting) position.

NOTE

Contact wipe is measured during operation. This measurement may not be as accurate as

measurement done using the slow close mode. It is recommended the user use the Slow

Close Test (paragraph 9.18) to verify wipe measurement if required.

9.14.5 Breaker Velocity

The CT-7500, when used with a travel transducer, calculates the breaker contact velocity
through the arc zone. Users must program the calculation points (analysis points) on the travel
curve for the unit to calculate contact velocity. Analysis points selection and setup are discussed
in the following paragraphs.

9.14.6 Analysis Point Selections.

Analysis points are used to calculate average contact speed through the contact's arc zone.
The analysis points are usually specified by the breaker manufacturers. The analysis points are
fully programmable in the Timer by the user. The Timer will store two setups for calculating
velocity (one each for open and close). These setups remain in the Timer's RAM memory until
changed by the operator.

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9.14.7 Analysis Point No.1.

Three selections are available to the user for setting analysis point No. 1:

1. PERCENTAGE OF STRK

2. DISTANCE FROM CLOSE

3. CONTACT #1

a. Percentage of Stroke:

Percentage of stroke is distance based upon percentage of total breaker stroke distance.

This distance is always measured from the starting point at the fully closed position of the

breaker contacts.

b. Distance From Close:

Distance from Close range is selectable from 00.0 inch to 99.99 inches or from 0.0

centimeter to 99.90 centimeters.

closed position.

c. Contact Point #1:

Contact point is the distance from the contact's closed position to the point where it is in

transition from close-to-open (or open-to-close position).

this selection.

Again, this distance is referenced from the contact's

Contact channel #1 will be used for

9.14.8 Analysis Point No. 2.

Only two selections for analysis point 2 are available to the user:

1. PERCENTAGE OF STRK

2. DISTANCE FROM CLOSE

The selection of analysis point No. 2 is the same as for analysis point No. 1.

1. Average velocity through the arc zone is calculated by using the following formula:

2. The current breaker contact velocity will be recalculated based on data stored in memory

(RAM) after any new analysis point(s) is selected. The user does NOT need to operate the

breaker again to acquire new contact velocity data after changing the analysis points (a new

velocity is calculated from travel data stored in memory from the last operation).

3. For complex velocity calculations, the user can download a test plan to the CT-7500 from an
IBM PC. This test plan can be recalled and used to calculate a breaker's contact velocity.

NOTE

V

= Distance

ave

÷

Time

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9.15 Set-Up Open Analysis Points

Table 9-16. Setting Up "OPEN" Analysis Points Using Distance

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS # 3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT ANALYSIS POINT. PRESS # 1 KEY. 1. OPEN TIMING

2. CLOSE TIMING

3. PRINT SETTING

4. TEST PLAN

3 SELECT OPEN ANALYSIS. PRESS # 1 KEY. OPEN ANALYSIS PT 1

1. PERCENT OF STROKE

2. DISTANCE FROM CLOSE

3. CONTACT #1

4 SELECT DISTANCE FROM CLOSE. PRESS # 2 KEY. OPEN ANALYSIS PT 1

DISTANCE FROM CLOSE

VALUE: XX.XX in

"ENTER" TO CONFIRM

5 ENTER 1 INCH. PRESS # 0-9 KEY. OPEN ANALYSIS PT 1

DISTANCE FROM CLOSE

VALUE: 01.00 in

"ENTER" TO CONFIRM

6 CONFIRM ENTRY. PRESS "ENTER" KEY. OPEN ANALYSIS PT 2

1. PERCENTAGE OF STROKE

2. DISTANCE FROM CLOSE

7 SELECT DISTANCE FROM CLOSE. PRESS # 2 KEY. OPEN ANALYSIS PT 2

DISTANCE FROM CLOSE

VALUE: XX.XX in

"ENTER" TO CONFIRM

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Table 9-16. Setting Up "OPEN" Analysis Points Using Distance (Con’t)

STEP OPERATION ACTION DISPLAY

8 ENTER 5 INCHES. PRESS # 0-9 KEYS. OPEN ANALYSIS PT 2

DISTANCE FROM CLOSE

VALUE: 02.00 in

"ENTER" TO CONFIRM

9 CONFIRM ENTRY. PRESS "ENTER"

KEY.

1.TIME BRKR

2.GET RSLT

3.SET UP

4.DIAGNOSTICS

NOTES

1. If an entry is not correct, re-enter digits until display shows desired numbers, then press

“ENTER” key.

2. Analysis Point #1 is 1.00 inch from the fully closed position.

3. Analysis Point #2 is 2.00 inches from the fully closed position.

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9-16. English/Metric Selection

The CT-7500 supports and displays both English and Metric calculations from the breaker's
travel parameters (stroke, velocity, (etc.). The user can switch from one to the other by following
the steps in Table 9-17, below:

Table 9-17. Select Metric Units of Measure

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS # 3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT MEASUREMENT UNITS. PRESS # 2 KEY. SELECT UNITS

1. ENGLISH

2. METRIC

3 SELECT METRIC. PRESS # 2 KEY. 1. TIME BRKR

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

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9.17 Set CT-7500 Internal Clock

The CT-7500 has an internal clock with a lithium battery. The clock's time and date is
displayed on the LCD screen. When a timing shot is stored in EEPROM, time and date are also
stored. To set the clock, perform the steps in the following table:

Table 9-18. Setting the Clock and Calendar

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS # 3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT NEXT PAGE. PRESS # 4 KEY. 1. SHOT DESCRIPTION

2. NUMBER OF CHANNELS

3. COMPUTER IF

4. CLOCK 5.PRINT

3 SELECT SET CLOCK. PRESS # 4 KEY. TIME: HH:MM:00

XX:YY:00

4 ENTER HOURS AND MINUTES. PRESS # 0-9 KEY. TIME: HH:MM:00

XX:YY:00 XX:YY:00

DATE: MM/DD/YY

XX/YY/ZZ

5 ENTER MONTH, DATE, YEAR. PRESS # 0-9 KEY. TIME: HH:MM:00

XX:YY:00 XX:YY:00

DATE: MM/DD/YY

XX/YY/ZZ XX/YY/ZZ

6 RETURN TO MAIN MENU. NO ACTION. 1. TIME BRKR

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

Note

The real time clock battery is good for 3 years. Loosing the clock battery will not affect the CT­7500 performance.

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9.18 Slow-Close Test

The CT-7500 offers a unique feature called a "slow-close" test. This test lets users measure
the distance of a breaker's contact travel from fully opened position to contact "touch" position and
contact wipe (or penetration) distance. This test requires the operator manually jack the breaker's
contact from the fully open position to the fully closed position.

Contact channel 1, 2, 3, and transducer channel 1 will be used for this test. The CT-7500 will
measure the contact touch and contact wipe (penetration) of each contact channel.

Contact touch is the distance measured from contact fully open to the first position contact
channel electrically closed.
Contact wipe (or penetration) distance is measured from the contact position first electrically
closed to the final closed (latching) position.

Table 9-19. Performing a Slow-Close Test

STEP OPERATION ACTION DISPLAY

1 SELECT DIAGNOSTIC MENU. PRESS # 4 KEY. 1. SLOW CLOSE TEST

2. PRINT DATA

3. TEST TRANSDUCER

4. CHECK HOOK UP

2 SELECT SLOW CLOSE TEST. PRESS # 1 KEY. BREAKER SLOW CLOSE TEST

RMV CB GND (1 SIDE)

"ENTER" TO BEGIN

3 START SLOW CLOSE TEST. PRESS "ENTER" KEY. CONTACT 1:OPEN

CONTACT 2:OPEN

CONTACT 3:OPEN

LIFT TO CLS BREAKER NOW

4 CONTINUE TO CLOSE BREAKER. NO ACTION. LIFT BRKR TO CLS POS

THEN PRESS "ENTER"

TO FIND CONTACT WIPE

5 RETURN TO MENU. NO ACTION. 1. TIME BRKR

2. GET RSLT

3. SET UP

4. DIAGNOSTIC

Notes

The user can also save a slow-close test report in EEPROM. A typical report of a slow-close test
is shown on next page.

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Figure 9-12. Typical Slow-Close test report

9.19 Transducer Self-Test

The users can check transducer electronics by connecting transducer to the CT-7500 and
running a “Transducer Self Test”.

Table 9-20. Performing a Transducer Self Test

STEP OPERATION ACTION DISPLAY

1 SELECT DIAGNOSTIC. PRESS # 4 KEY. 1. SLOW-CLOSE TEST

2. PRINT DATA

3. TEST TRANSDUCER

4. CHECK HOOKUP

2 SELECT TRANSDUCER. PRESS # 3 KEY. TRANSDUCER TEST

1= XXX.XX INCHES

2= XXX.XX INCHES

3= XXX.XX INCHES

Note

1. After selecting transducer test mode, move transducer slider and observe display on the CT­7500 LCD.

2. If slider is moved 1.00”, the CT-7500 LCD should display 1.00”.

3. Press STOP key to return to main menu.

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9.20 Check Cable Hookup

Table 9-21. Checking the Cable Hookup

STEP OPERATION ACTION DISPLAY

1 SELECT DIAGNOSTIC. PRESS # 4 KEY. 1. SLOW-CLOSE TEST

2. PRINT DATA

3. TEST TRANSDUCER

4. CHECK HOOKUP

2 SELECT CHECK HOOK UP. PRESS # 3 KEY. MAKE SURE BREAKER

IS IN CLOSE POSITION,

THEN PRESS "START"

3 INITIATE TEST. PRESS "START" KEY. 1 2 3 4 5 6

C - - - - -

7 8 9 10 11 12

- - - - - -

4 RETURN TO MAIN MENU. PRESS "STOP" KEY. 1. TIME BREAKER

2. GET RESULT

3. SET UP

4. DIAGNOSTIC

Notes

1. The CT-7500 will also print the test report with the thermal printer.

2. A contact closure is shown as "C" on the LCD and printout.

3. An open contact is shown as "-" on the LCD and printout.

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9-21 Automatic Print Setting

The CT-7500 can be set to print graph and tabulated results automatically after timing a
breaker. To turn on “Auto Print Results” mode, follows steps in table below

Table 9-22. Automatic Print Setting

STEP OPERATION ACTION DISPLAY

1 SELECT SET UP MENU. PRESS # 3 KEY. 1. ANALYSIS POINT

2. MEASUREMENT UNITS

3. SAVE / RESTORE

4. NEXT PAGE

2 SELECT NEXT PAGE. PRESS # 4 KEY. 1. SHOT DESCRIPTION

2. NUMBER OF CHANNELS

3. COMPUTER IF

4. CLOCK 5.PRINT

3 SELECT SET PRINT. PRESS # 5 KEY. SET PRINT MODE

1. AUTOMATIC PRINT

2. BY REQUEST ONLY

4 SELECT “AUTOMATIC PRINT”. PRESS # 1 KEY. 1. TIME BREAKER

2. GET RESULT

3. SET UP

4. DIAGNOSTIC

Note

Select print “BY REQUEST ONLY” will disable Automatic Print mode.

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10.0 Running CT-7500s in Tandem

For timing application requiring more than 12 timing contact channels, the user can use two or
more CT-7500s to time a circuit breaker. A typical application is to use a CT-7500-12 and a CT­7500-6 to time a 18 contact ATB. To time this circuit breaker, the user can use the following steps:

Connect the CT-7500-12 to phase A and B of the circuit breaker.
Connect the CT-7500-6 to phase C on the circuit breaker.
Connect the CT-7500-12 initiate cable to the breaker control circuit. The

operate

the circuit breaker.

CT-7500-12

Connect the external trigger cable of the CT-7500-6 to the OPEN coil for the OPEN test or

CLOSE coil for the CLOSE test. The

Set the CT-7500-6 to start a test using
Set the CT-7500-12 to start a test using

Press the “START” key on the CT-7500-6 to start the sequence then press the “START”

CT-7500-6

will

operate as the slave device

“External Trigger”.

“Internal Trigger”.

.

key and hold the “ARM” switch on the CT-7500-12.

The CT-7500-12 will operate the circuit breaker and start the timing sequence; The CT-7500-6 will
start its timing sequence as soon as it senses the voltage applied to the breaker coil.
The timing report of the CT-7500-12 will show the contact time for phase A and B. The timing
report of the CT-7500-6 shows contact time for phase C.
If the user down-loads the test results of both the CT-7500s to the PC, the user then can combine
the 2 test reports to generate a 18 channel test report.

will

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11.0 CT-7500 Trouble Shooting Guide

Problems Suggestion

1. CT-7500 will not trip or close breaker.

2. No contact time (0 ms) in Trip or Close test.

3. No contact time (0 ms) in Close-Open.



Make sure you hold the “ARM” switch down during

test.



Check OPEN or CLOSE fuses.



Check initiate leads. For a “Positive Trip” circuit,
one Close lead and one Open lead should be
connected to the Positive of the power supply.



Check initiate leads. For a “Negative Trip” circuit,
one Close lead and one Open lead should be
connected to the Negative of the power supply.



Make sure one side of breaker in not grounded.



Make sure the breaker operates on OPEN or Close
test only. A dual operation OPEN-CLOSE or CLOSE­OPEN will resulting in 0ms reading.

 Bad CT-7500 contact channels or bad cables. Try
“CHECK HOOK-UP” test.



Make sure breaker contacts complete the transition
from Open (initial state) to Close then Open (final
state). You can see this transition by looking at the
timing chart.

4. Select Open-Close test. The breaker opens and will
not close.

5. No tabulated and timing chart for contact channels
above #3.

6. No tabulated or timing chart for travel 2 and 3.

7. No data or erratic reading on travel transducer.

8. No activity on V2 voltage input channel.



Make sure the contact close state is longer than
10ms. The CT-7500 has a 10ms de-bounce time, any
contact state less than or equal to 10ms is invalid.
If you have this problem, your delay time is probably
too slow.



Try Close-Open using contact channel #1 option.



Delay between Open to Close is probably too
small. Increase delay time.



The CT-7500 always defaults to contact channels
1,2 and 3. You need to turn on contact channels
above 3.



Turn on travel channel 2 and 3.



Bad transducer. Try “TRANSDUCER” test.



Transducer slider is not secured to timing rod.



Transducer is not secured properly.



The V2 voltage input channel requires a voltage
change (0v to above 30v) to see activities on the
timing chart.

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Problems Suggestion

9. No “PASS/FAIL” on tabulated report.

10. CT-7500 will not communicate with PC.

11. Turn on Automatic Print Results mode.

12. CT-7500 will not print results on external printer.

13. Where can I get some thermal paper?

14. How do I darken or lighten the LCD?

15. How do I move thermal paper forward or
backward?



Test plan is not loaded before taking test. You can
load test plan then re-print the tabulated report.



Make sure CT-7500 is under computer control.



Make sure your PC com port is selected correctly.



Make sure your serial cable is connected properly.



See section 9-21.



The CT-7500 will support HP ink-jet printer only.



Check your printer cable.



Call the factory at 909-923-9390 or BG Instruments
at 509-893-9881. The CT-7500 uses TP-4 thermal
paper.



In case of an emergency, you can get thermal
paper from Radio Shack. Radio Shack carries 4.25”
wide thermal paper. It is not the right size but it will
work.



Press and hold the “↑ PAPER LCD” key for 3
seconds will darken LCD.



Press and hold the “↓ PAPER LCD” key for 3
seconds will lighten LCD.



Press and release the “↑ PAPER LCD” key will
advance thermal paper.



Press and release the “↓ PAPER LCD” key will
move thermal paper backward.

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APPENDIX A

ITE Circuit Breaker model 14.4K Timing Chart.

AP1= 1.5”

AP2= 3.5”

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APPENDIX B

CT-7500 Test Plan for ITE Circuit Breaker Model 14.4K.

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APPENDIX C

CT-7500 Timing Chart for ITE Circuit Breaker Model 14.4K.

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APPENDIX D

CT-7500 Tabulated Report for ITE Circuit Breaker Model 14.4K.

CT-7500 Timing Chart for ITE Circuit Breaker Model

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APPENDIX E

Timing Chart for Siemens TCP-149 Circuit Breaker.

AP1= Contact Point

b= Breaker Stroke

a= Distance between AP1 & AP2

AP2= Contact - 10ms

Note

Velocity calculation for this breaker requires a formula:

V= 31.5 x (a/b) m/s

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APPENDIX F

CT-7500 Test Plan for Siemens TCP-149 Circuit Breaker.

Note

Formula to calculate velocity is programmed in breaker test plan.

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