Vanguard CT-7500 S2 - Manual (Page 53)

REV 2 CT-7500 S2 USER’S MANUAL
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3.2.1. Timing an OPEN Operation
The CT-7500 S2 can time breakers with or without insertion resistors. The insertion resistance
can range from 10 to 5,000 Ohms. Any insertion resistance greater than 5,000 Ohms is detected
as an open circuit. The timing results will show the main contact time and the insertion resistor
contact time. Graphic reports will show the main contact and the resistor contact activities on
each of the channels. Use the steps below to time an OPEN operation.
a. When the unit is turned on and the firmware has been loaded, you will be presented
with the “START-UP” menu as shown below:
Press the [1] key (TIME BRKR).
b. The following screen will be displayed:
1. NO
Press the
[1]
key if you are timing a circuit breaker without insertion resistors.
Continue to step c.
2. YES
Press the [2] key if you are timing a circuit breaker with insertion resistors. The
following screen will be displayed:
Select the resistance value by pressing the corresponding key ( [1] , [2] , or [3] ).
Continue to step c.
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 02/22/11
2. GET RSLT 07:17:07
3. SETUP
4. DIAGNOSTICS