INM 725B Rev 21535 11 Optional 48VAC Signal Input WiringNOTE:In applications that require 48VAC signal inputs we supply optional 4 channel alarmcards in place of the standard version48VAC Signal SupplyOn RTK 725B systems where 48VAC is required as a signal supply voltage this needs to bederived 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 signalsupply input terminals i.e. OV and OVC and +V and +VC before applying the high voltage signalsupplyLED F2 is used to indicate that the signal supply fuse has blown.Fuse F2, (5 X 20mm 1A), is provided on the power input card to protect the signal supplyvoltage and the 48VAC is internally linked to all of the associated input card *C terminals toallow distribution to the external field contacts.As all *C terminals are internally linked the customer can connect each input contact to adedicated terminal as shown in the middle cell or a single feed can be used for multiplecontacts 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 48VAC a drop-down menu is provided in theConfiguration Software. Selection is made under the Input tab using the drop-down menulabelled “Field Contact Voltage (V)”WR725B SMALL WINDOW VERSION TYPICAL REAR VIEWOV OV +V+V OVC +VCRx F1 F2 TxCHANNEL215 - 83CINPUTS43 1C 2CA4CAPINPUTSCHANNEL31 2 1C41 - 4P3P1 P2CR1 CR2 CR3 CR4F2 - 1ASUPPLY VOLTAGEEXT PBINTERNAL SIGNALSUPPLY COMMONCELL 2 CELL 1 CELL 0+V48VAC SIGNAL
