4RF Aprisa XE User Manual - page 39
Mounting and Installing the Terminal | 37
Aprisa XE User Manual
Power Supplies
US and Canada: Installations should be in accordance with US National Electrical Code ANSI / NFPA 70,
and Canadian Electrical Code, Part 1 C22.1.
WARNING:
Do not apply power to the terminal until you have completed installing the interface
cards and connecting the antenna.
Before disconnecting the safety earth during maintenance, remove AC or DC power
supply connections, antenna cable and all interface cables from the terminal.
DC Power Supply
There are four DC power supply options for the terminal; 12 VDC, 12 VDC Low Power, 24 VDC and 48 VDC.
The DC inputs are polarity critical so the DC voltage must be applied with the correct polarity.
Nominal voltage
Input voltage
range
Maximum Power
input
Maximum input
current
Recommended
DC breaker
rating
+12 VDC LP
10.5 to 18 VDC
53 W
5 A
8 A
±12 VDC
10.5 to 18 VDC
180 W
18 A
25 A
±24 VDC
20.5 to 30 VDC
180 W
8 A
10 A
±48 VDC
40 to 60 VDC
180 W
4 A
5 A
CAUTION: An all-pole switch or DC circuit breaker of the rating shown in the table above must be fitted
between the terminal DC input and the DC power source.
Each terminal or MHSB terminal should have its own separate fuse or DC circuit breaker.
12 VDC / 24 VDC / 48 VDC Power Supply
The power supply DC input is isolated from ground, so the DC power input can be either positive grounded
or negative grounded. The positive or negative terminal should be connected to ground.
12 VDC LP Power Supply
The 12 VDC Low Power is a high efficiency power supply for low power consumption applications up to a
maximum of 53 watts input power (see ‘Power Consumption’ on page 312).
The DC input on this power supply is not isolated from ground as the negative input is internally connected
to ground via the Aprisa XE chassis. The DC power input for this power supply must be a positive 12 V
supply with the negative grounded.