Vanguard CT-8000 - Manual (Page 20)

CT-8000 USER’S MANUAL REV 2
15
3.1.4. External Trigger Input Connections
The External Trigger Mode can be used to start recording data when the CT-8000 senses a
voltage. A typical application for the External Trigger Mode is to time a circuit breaker in a Close
operation and to start timing only when the Close coil is energized, thus bypassing the 52X relay
delay time.
Since the 52X relay carries the Close coil current, the CT-8000’s initiate cable must be
connected to the Close terminal as shown in Figure 5. The CT-8000 will energize the 52X relay
to start the Close operation, which will then start the timing when the CT-8000 senses the
voltage across the closing coil. Typical external trigger input connections are shown in Figure 8.
Another application for the External Trigger is to start timing the breaker when the user trips or
closes the breaker remotely.
NOTES
• The minimum trigger voltage is 30 Vac/dc. Maximum, continuous voltage is limited
to 300 Vac/dc. Different trigger voltages can be set at the factory by request.
• The CT-8000 will start looking for the external trigger voltage when the message
“AWAITING TRIGGER…” is displayed on the LCD screen. The external trigger
voltage must be sensed by the CT-8000 within 15 seconds after the initiate
sequence has begun. The CT-8000 will return to the “START-UP” menu if no
voltage is sensed.
Figure 8. Typical External Trigger Input Cable Connections