Vanguard DigiTMR User Manual download pdf (Page 29)

REV 3 DIGITMR USER’S MANUAL

3.5.2. Timing an OPEN Operation WITH Insertion Resistors

The DigiTMR can time breakers with insertion resistors. The insertion resistor can range from 10

to 7,000 Ohms. Any insertion resistor greater than 7,000 Ohms is detected as an open circuit.

When a breaker with insertion resistors is timed, the timing window results show the main

contact timing and the insertion resistor contact timing. The graphic reports also show the main

and the resistor contact activities on each of the channels. To time an OPEN operation with

insertion resistors:

a. Start from the “START-UP” menu:

Press the [1] key (TIME BRKR) to start a test.

b. The following screen will be displayed:

Press the [2] key (YES).

c. The following screen will be displayed:

Select the resistor value by pressing the corresponding key (

[1], [2], or [3]).

d. The following screen will be displayed:

Press the

[1] key (WINDOW = 1 SEC) to select the 1-second timing window.

TIMING WINDOW:

1. WINDOW = 1 SEC

2. WINDOW = 10 SEC

3. WINDOW = 20 SEC

RESISTOR VALUE:

1. LESS THAN 1000 OHM

2. 1000 TO 2000 OHM

3. MORE THAN 2000 OHM

INSERTION RESISTOR?

1. NO

2. YES

1. TIME BRKR 04/17/09

2. GET RSLT 10:49:23

3. SET-UP

4. DIAGNOSTICS

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Vanguard DigiTMR User Manual Page 29