Vanguard CT-6500 S2 - Manual (Page 25)

CT-6500 Series 2 Operating Instructions
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8.5 External Trigger Input
The External Trigger Mode enables the user to start recording data when the CT-6500 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 user will need to connect the CT-6500’s
initiate cable to the close terminal shown in Figure 5.0. The CT-6500 will energize the 52X relay
to start the close operation, which will then start the timing when the CT-6500 senses the voltage
across the closing coil. See Figure 8.0 for a typical test hookup. Another application for external
trigger is to start timing the breaker when the user trips or closes the breaker remotely.
NOTE
Minimum trigger voltage is set for 30 Vac/dc. Maximum, continuous voltage is limited to
300 Vac/dc. Different trigger voltages can be set at the factory, based upon specific
requests.
The CT-6500 will start looking for the external trigger voltage when the message,
“AWAITING TRIGGER…” is shown on the LCD screen. The external trigger voltage
needs to be sensed by the CT-6500 within 15 seconds after the initiate sequence has
begun. The CT-6500 will return to the main menu if no voltage is sensed.
Figure 8.0 External Trigger Cable Hook-Up