MBF-40 SMR700/SMR800 PS REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
www.cobham.com/wireless Date: 28-Jan-16 Cobham Wireless – Coverage
Page | 10
Rev. 2.1 Doc. No. 00046UM
2.2.3 Power Requirements
This section describes the circuit breaker requirements and power cabling and connection
considerations for 230VAC power source and for -48VDC power sources.
2.2.3.1 Circuit Breaker Requirements
The power connections to the unit are hard-wired. To disconnect the unit (either manually or
automatically in case of overcurrent), it is required to install a circuit breaker
on the wall
near
the
unit
, at an easily accessible distance and location from the unit.
Circuit-breaker minimum requirements
• 115 VAC - Maximum current 10A
• Needs to be SAFETY approved
• Use only a two-pole disconnect device.
• Requires minimum contact separation of 3mm.
• Install on the wall near the unit.
2.2.3.2 115 VAC Power Source Cable Requirements
Cable requirements:
• Cable should be NRTL (safety) approved with a minimum of 14AWG or 2.5mm
2
per conductor,
and maximum of 12AWG or 4mm
2
per conductor.
• For safety, the GND cable must be 10mm longer than the Phase and Neutral cables.
2.2.3.3 -48V Power Source Connection Requirements
Note: The -48VDC version of the power supply is designed to turn off if the supply voltage falls below -36V
(±1V), not to drain the feeding battery. It will turn on again as the supply voltage reaches -43V (± 1V).
-48V power supply requirements
The 48VDC power supply must comply with SELV requirements, as defined in EN60950, which
implies double isolation. The output power needs to be 48VDC +25%/-15%. The maximum input
current is 8A.
Recommended cable areas for 48VDC
Distance Cable Area
0 - 10 meters between repeater and
power supply
2,5 mm²
10 – 50 meters between repeater
and power supply
4 mm²
Over 50 meters between repeater
and power supply
Recommendation is to reconfigure the installation, or to make
special arrangements to increase cable area
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