Vanguard CT-7500 - Manual (Page 20)

MODEL CT-7500 OPERATING INSTRUCTIONS
14
Rev 2 Jan 2001
NOTE
Minimum trigger voltage is set for 30 V ac/dc. Maximum continous voltage is 300Vac/dc.
Different trigger voltages can be set at the factory, based on specific requests from users.
The CT-7500 will start looking for the external trigger input voltage after the CT-7500 Initiate
Sequence is completed (CT-7500 stops beeping after the user presses “START” key) and
message “LOOKING FOR TRIGGER VOLTAGE” is shown on LCD.
This external trigger voltage needs to be sensed by the CT-7500 within 5 second after the
Initiate sequence. The CT-7500 will return to main menu if no voltage is sensed.
8.6 AC Current Sensor Hookup
A clamp-on AC current sensor connecting to the breaker bushing CT allows the CT-7500 to
sense breaker bushing current. The AC current sensor requires a 100mA current to operate.
Maximum current is 25 amperes. Typical hookup is shown on figure 8-8.