Owner's manual

REV 2 CT-7500 S2 USER’S MANUAL

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