Vanguard DigiTMR User Manual download pdf (Page 7)

REV 3 DIGITMR USER’S MANUAL

1.0 INTRODUCTION

1.1 General Description and Features

The DigiTMR is a microprocessor-based, time-versus-travel, circuit breaker analyzer. In Quick-

Shot Mode (optional), the DigiTMR has the capability of online testing and can capture the

breaker’s trip or close time, the trip/close-coil current “fingerprint,” and the battery supply

voltage while the breaker is still in service. In Time-Travel mode, the DigiTMR can fully analyze a

circuit-breaker’s performance by testing the contact time, stroke, velocity, over-travel, and

contact wipe. Contact-motion analysis can be performed for all breaker contact operations

(Open, Close, Open – Close, Close – Open, and Open – Close – Open). The DigiTMR’s timing

window is selectable between 1-second, 10-second, or 20-second periods. The 10-second and

20-second timing windows are ideal for timing long duration events such as circuit-switcher

contact testing.

The DigiTMR can also perform a Slow-Close test. A Slow-Close test determines the contact

touch distance and penetration by using the travel transducer and dry contact channels.

The DigiTMR can be computer-controlled via its RS-232C interface. Computer control is fully

covered in the Vanguard Circuit Breaker Analyzer (VCBA) software manual. This manual focuses

on operating the DigiTMR in stand-alone mode.

The DigiTMR features:

• Three contact-input channels

• One analog voltage monitoring input channel

• One digital voltage monitoring input channel

• One external trigger input channel

• One digital travel transducer input channel

• One Trip/Close current monitoring channel

• One CT input channel (optional)

Contact Timing Channels

A breaker’s interruption of contacts is timed with the dry-contact input

channels. Each channel can detect the main contact’s and the insertion resistor

contact’s times in milliseconds and cycles.

In Time Travel Mode, each DigiTMR contact channel measures contact close

time, contact open time, insertion resistor contact open and close times,

contact bounce time, resistor on time, and contact spread time.

NOTE

The DigiTMR can detect insertion resistances ranging from 10 to 7,000 Ohms.

Resistance over 7,000 Ohms is detected as an open contact. In Quick-Shot mode,

the DigiTMR can provide the contact Close time and contact Cleared time using

the circuit breaker CT.

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Vanguard DigiTMR User Manual Page 7