Vanguard CBCT User Manual
Page 12
CBCT USER’S MANUAL
REV 1
9
2.3
CBCT Timer Start Input
Timer Start Input mode can be selected only when the “Main Menu” is being displayed. Select
the Timer Start input mode by pressing the
[Arrow]
key. The LED will be lit next to the label for
the currently selected mode. The CBCT timer can be started in three selectable modes: internal,
wet input, and dry input. Each mode is described below:
• Internal Mode
In this mode, the timer will start when the
[PULSE]
switch is pressed. The CBCT will
output the preset voltage to the Pulse output terminals and start the timer.
• Dry Contact Mode
In this mode, the timer will look for a change in the Start input terminals after the
[PULSE]
switch is pressed. The CBCT will output a DC voltage to the Start input
terminals to detect the dry contact status.
• Wet Contact Mode
In this mode, the timer will look for a change in the Start input terminals after the
[PULSE]
switch is pressed. In this mode, the input will look for a change in voltage or
no-voltage condition to start the timer. A voltage from 24 Vdc to 300 Vdc is considered
as ‘Voltage Present’.
Figure 5. Typical CBCT Timer Connection
(Internal Start, Dry Contact Stop)