Vanguard CT-7500 - Manual (Page 31)

MODEL CT-7500 OPERATING INSTRUCTIONS
Rev 2 Jan 2001
25
9.1.2 Timing an OPEN Operation With Insertion Resistors
The CT-7500 can time breakers with insertion resistors. The insertion resistor range is 10 to
7000 ohms. Any insertion resistor more than 7,000 ohms is detected as open circuit. Timing
window results will show main contact timing and insertion resistor contact timing. Graphic reports
show main contact and resistor contact activities on each of the channels.
Table 9-2. Open Operation With Insertion Resistor
STEP OPERATION ACTION DISPLAY
1 READY TIMER FOR BREAKER OPERATION. PRESS #1 KEY. INSERTION RESISTOR?
1.NO
2.YES
2 SELECT INSERTION RESISTOR. PRESS #2 KEY. TIMING WINDOWS:
1.WINDOW = 1 SECOND
2.WINDOW = 10 SECONDS
3 SELECT 1-SECOND WINDOW. PRESS #1 KEY. 1.INTERNAL TRIGGER
2.EXTERNAL TRIGGER
4 SELECT INTERNAL TRIGGER. PRESS #1 KEY. TIMING MODE:
1. OPEN
2. CLOSE
3. O-C 4. C-0
5. O-C-O
5 SELECT OPEN OPERATION. PRESS KEY #1. OPEN TIMING
Hold "ARM" Switch,
Then "START".
"STOP" to ABORT
6 INITIATE OPEN COMMAND. HOLD "ARM" KEY AND
PRESS "START" KEY. TEST IN PROGRESS
Hold "ARM" Until
Test complete.
(Up to 15 seconds)
7 ANALYZER IS READY TO OUTPUT RESULTS. NONE. 1.TIME BREAKER
2.GET RESULT
3.SET-UP
4.DIAGNOSTIC
Note
The User can set the CT-7500 to print tabulated and graphic reports automatically after it
completes a test. See section 9-21 for automatic print setting.