5.8 Optional 125VDC Signal Input Wiring
Each channel on the alarm card is provided with a 3 pin header and 2 way shorting bar which
allows the user to select the inputs to operate on 125V.
On RTK 725B systems where 125VDC is required as a signal supply voltage this needs to be
derived externally and connected to terminals OVC and +VC as typically shown above.
IMPORTANT:- Please ensure there are no external links between the logic supply and the signal
supply input terminals i.e. OV and OVC and +V and +VC before applying the high voltage signal
supply
LED F2 is used to indicate that the signal supply, (+VC), fuse has blown.
Fuse F2, (5 X 20mm 1A), is provided on the power input card to protect the signal supply voltage
and the 125VDC is internally linked to all associated input card *C terminals to allow distribution
to the external field contacts.
As all *C terminals are internally linked the customer can connect each input contact to a
dedicated terminal as shown in the middle cell or a single feed can be used for multiple contacts
as shown in the right hand cell.
The common return for all remote pushbuttons is +V (+24VDC)
To set the signal supply voltage on each input to 125VDC a drop-down menu is provided in
the Configuration Software. Selection is made under the Input tab using the drop-down menu
labelled “Field Contact Voltage (V)”
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