Owner's manual

CT-7500 S2 USER’S MANUAL REV 2

Trip/Close Current Monitoring

A built-in Hall-effect current sensor records the Trip/Close current level and duration. The

breaker’s operate-coil current waveform duration (effectively, a performance "fingerprint" or

"current profile") can be used as a diagnostic tool for analyzing a breaker’s performance.

Breaker Stroke and Velocity

Three digital travel transducer channels are available on the CT-7500 S2 for measuring circuit-

breaker velocity, stroke, over-travel, and bounce-back. Unlike other transducer types, the

digital transducer requires neither calibration nor setup. A breaker’s contact-velocity is

calculated based on the contact’s travel distance over a period of time. A special feature is also

available to “slow-close” test a breaker and obtain a test result report.

Resistor Type Transducer Input

One resistor type input channel is also available on the CT-7500 S2. This input channel allows

the unit to measure circuit-breaker motion by directly interfacing with resistive type

transducers. The transducer resistance ranges from 200 ohms to 10K Ohms.

Breaker Initiate Features

A built-in solid-state initiate device is used to operate a breaker from the CT-7500 S2. The

operational modes include Open, Close, Open – Close, Close – Open, and Open – Close – Open.

Multiple operations, such as Open – Close and Open – Close – Open, can be initiated by using

programmable delay time or by sensing a breaker’s contact condition.

Internal Test Record Storage

The CT-7500 S2 can store up to 150 test records in Flash EEPROM. Test records can be retrieved

and printed on the built-in thermal printer, or they can be transferred to a PC via the unit’s RS-

232C or USB interface.

Internal Breaker Test Plan Storage

The CT-7500 S2 can store up to 99 circuit-breaker test plans. Test plans are comprised of all

circuit-breaker performance specifications (stroke, velocity, and contact time). A test plan can

be used to immediately test a circuit-breaker. A pass/fail report is then generated by comparing

actual performance with the specifications in the stored test plan. Test plans can also be

generated on a PC and transferred to the CT-7500 S2 via the unit’s RS-232C or USB interface.

Computer Interface

The CT-7500 S2 can be computer-controlled via its RS-232C or USB interface. A Windows®

XP/Vista-based Breaker-Analysis software application is provided with each unit. Using this

software, circuit-breakers can be timed from the PC. Test records can be retrieved from the CT-

7500 S2 and then stored on the PC for future analysis and report generation. Circuit-breaker

test plans can also be created on the PC and transferred to the CT-7500 S2. Additionally, test

records can be exported in Microsoft® Excel format for further analysis.