User Manual

5 Ch. VHF Radio Repeater Equipment
Document Number 50-189201HBK – Issue 1 Page 29 of 48
4.8. 24V PSU Shelf (50-146512)
The power supply shelf (50-146512) 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 DC LED on the front panel would be extinguished and the alarm loop
would be broken.
4.8.1. 24V PSU Shelf (50-146512) 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: 95% RHNC
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
4.8.2. 24V PSU Shelf (50-146512) Major Components
Component Part Component Part Description Qty Per
Assembly
13-003301 Mains Filter Assembly 8 AMP 1
20-001601 12V Relay Board 1
80-008921 PSU 4U Rack mount chassis 1
93-510077 Aluminium Clad Resistor 0R02 50W 2
94-100004 60A DUAL DIODE 1
96-300054 24V 17A PSU 400W 2
96-700034 LED RED 5mm IP67 1
96-700035 LED GREEN 5mm IP67 2
96-920023 5A Circuit Breaker 2