Model ct-7500 operating instructions – Vanguard CT-7500 User Manual

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MODEL CT-7500

OPERATING INSTRUCTIONS

Rev 2 Jan 2001

9.1.3 Timing CLOSE-OPEN Operation Using Contact Channel #1

The CLOSE-OPEN operation of the breaker simulates a condition where a breaker is closed on

a fault. The CT-7500 first initiates a CLOSE command then sends an OPEN command only when
it detects that main contact #1 is closed. This mode truly simulates the breaker closing into a fault
condition in the field.

Table 9-3. Close-Open Operation with No Resistor

STEP

OPERATION

ACTION

DISPLAY

READY TIMER FOR BREAKER OPERATION.

PRESS #1 KEY.

INSERTION RESISTOR?
1.NO
2.YES

SELECT NO INSERTION RESISTOR.

PRESS #1 KEY.

TIMING WINDOWS:
1.WINDOW = 1 SECOND
2.WINDOW = 10 SECONDS

SELECT 1-SECOND WINDOW.

PRESS #1 KEY.

1.INTERNAL TRIGGER
2.EXTERNAL TRIGGER

SELECT INTERNAL TRIGGER.

PRESS #1 KEY.

TIMING MODE:
1. OPEN

2. CLOSE

3. O-C

4. C-0

5. O-C-O

SELECT CLOSE-OPEN OPERATION.

PRESS #4 KEY.

C-O SECOND TRIGGER
1. CONTACT #1 CLOSE
2. SET DELAY
3. NO DELAY

SELECT CONTACT #1 CLOSE.

PRES #1 KEY.

CLOSE-OPEN TIMING
Hold "ARM" Switch,

Then "START".

"STOP" to ABORT

INITIATE OPEN COMMAND.

HOLD "ARM" KEY AND
PRESS "START" KEY.

TEST IN PROGRESS
Hold "ARM" Until
Test complete.
(Up to 15 seconds)

ANALYZER IS READY TO OUTPUT RESULTS.

NONE.

1.TIME BREAKER
2.GET RESULT
3.SET-UP
4.DIAGNOSTIC.

Note

1. Users can program a delay from 10 to 500 ms between the CLOSE and OPEN commands.
When a delay is used in this operation, it may not represent a true breaker condition.

2. Users can also program in no delay for this operation, in which case, the CLOSE and OPEN