Westermo MRI-128-F4G-PSE24 - Manual (Page 10)

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If the DC power input is 53V, the unit will aggregate the power with the AC power
input, if any.
Follow below steps to wire the redundant or aggregated DC power inputs.
1. Insert positive and negative wires into V+ and V- contacts respectively of the
terminal block connector.
2. Tighten the wire-clamp screws to prevent DC wires from being loosened.
3. DC1 and DC2 support polarity reverse protection functions.
Note 1: It is a good practice to turn off input and load power. Otherwise, your
screwdriver blade can inadvertently short your terminal connections to the
grounded enclosure.
Note 2: The range of the suitable electric wire is from 12 to 22 AWG.
Note 3: The unit will alarm for loss of power, for instance, PSU, DC1 or DC2.
2.3 Power Supply Specifications
Power Supply
Type
Input Range Fuse
Rating
Max. Power
Consumption
Min Max All Ethernet Ports
48 VDC 46 VDC 57 VDC 10A(T)
28W HI (250 VDC)
HI (110/230
VAC)
127 VDC
90 VAC
370 VDC
264 VAC
4A(T)
Table: Power Supply Specifications