Edwards Signaling EBPS Remote Booster Power Supply - Manual (Page 44)

38 Remote Booster Power Supply Technical Reference Manual
The maximum voltage is the highest voltage measured at the NAC terminals.
This value is not used in the calculations, but is given so you can ensure
appliance compatibility.
The source voltage is the BPS is 19.1 VDC operating minimum for the power
supply, and is calculated as 85% of 24 volts minus the internal panel loss.
The load factor is a measure of how the power supply voltage reacts when a load
is applied. The load factor measures the voltage drop per ampere of current
drawn by the load.
The power type reflects the type of power supplied to the NAC terminals at
minimum voltage. The current draw of notification appliances can vary
substantially with the type of power supplied: full-wave rectified (VFWR) or direct
current (VDC). It is important to know the power type at minimum terminal
voltage.
You’ll need to calculate the following values relating to your power supply and to
the NAC circuit current. These are:
• Minimum voltage
• Voltage drop
The minimum voltage is the lowest voltage measured at the NAC terminals when
the power supply is under the maximum load for that circuit (i.e. for the
appliances that constitute the NAC.)
The voltage drop is the difference between the minimum voltage and 16 V. This
value is for use with the worksheet only.