User's Manual

Bronx Justice Centre Radio Repeaters
Handbook Number: 80-283501HBKM Page: 41 of 86
4.1.14.1 VHF/UHF PSU Shelf Description
The power supply shelf consists of two, 400Watt 24V DC O.E.M modules which are commonly
supplied from the mains but separately switched. The DC outputs are separately monitored and this
data becomes half of the alarm data for the shelf (the two monitor loops are summed to form a single
alarm relay contact pair). A pair of low-loss power diodes combine the outputs from the PSU modules
in a redundant configuration such that if either module fails, the other supply would still be active but
the faulty supply’s DC LED on the front panel would be extinguished and the alarm loop would be
broken.
4.1.14.2 VHF/UHF PSU Shelf Technical Specification
PARAMETER SPECIFICATION
Height: 5U
Width: 19" (482.6mm)
Shelf
dimensions:
Depth: <450mm (excluding connectors & handles)
operational: -20°C to +60°C Temperature
range:
storage: -40°C to +70°C
Weight: <10kg
Humidity: 5 – 95% non-condensing
DC Output connectors: 6 x XLR female
DC Output Voltage: 24V DC (x 6)
24V DC O/P fuse rating: 10A (x 6)
Environmental protection: IP44
Alarms: PSU1 & 2 (‘D’ connector pins 1 & 2)
Case: Iridite NCP coat
Heatsinks: Black anodised aluminium
Handles: Silver anodised aluminium alloy
Finish
Fascia Painted to RAL7035