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A power limited power supply, listed for Fire Protection Signaling, (may be located remotely) with both
Primary and Secondary power, must be used for Fire Protective Signaling Applications.
Operating Voltage Range
18-28 VDC
Maximum current draw; (All states)
RPT-485W
RPT-485WF
The maximum allowed voltage drop along the supply loop is limited by the minimum input voltage (18VDC)
measured across TB3 (+24V, power supply common) of the RPT-485W/WF.
Calculating the maximum wiring resistance (Rmax) permitted for the +24V power supply connection.
Formula:
Rmax= (Lowest Power Supply Voltage Possible) - (Minimum Operating Voltage of RPT-485W/WF )
For a Listed Power Supply (listed for Fire Protective Signaling use) with battery supplied secondary power,
the lowest supply voltage possible is 20.4V.
Example: MPS-24A with batteries
RPT-485W:
RPT-485WF:
14
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Section Five:
Power Supply Specifications
0.047 A
0.049 A
Maximum Current Required by RPT-485W/WF
Rmax = 20.4V-18V = 51 Ohm
0.047A
Rmax = 20.4V-18V = 49 Ohm
0.049A
Document 15640 Rev B1 08/13/97 P/N 15640:B1
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