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Installation Manual
2.3.3
Installation
ULAF+ V4.2
Power supply to the subrack, fusing
The subrack power supply is -48 VDC or -60 VDC . Power is supplied redundantly via connectors Power 1 and Power 2 and is decoupled with diodes.
Recommended fuse protection for a fully equipped subrack is as follows:
– For a 48 VDC supply → 20 A fuse
– For a 60 VDC supply → 16 A fuse
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Operation with one voltage source:
⇒ Connector Power 1 and Power 2 must be short circuited
Failure of the power supply or the power supply dropping below a threshold of
around 36 VDC triggers an urgent alarm.
Operation with redundant power supply:
⇒ Power sources are connected to separately connector Power 1 or connector
Power 2.
Failure of one power supply or the power supply dropping below a threshold of
around 36 VDC triggers an alarm.
The unit is connected with a 3W3 D-Sub mixed-pole connector with high current contacts. The cable must have a line diameter of 2.5 mm2.
You must fuse the cables to the subrack with 20 AT.
2.3.4
Protective grounding of the subrack
The subrack must be effectively grounded, i.e. the casing must be connected with
ground in such a way that the requirements (cable line diameter, ground resistance, labeling, contacts, etc.) fulfill safety standard EN 60950-1:2006. It is grounded in the following way
• normally via the rack in which the subrack is installed, or
• with a screw and a serrated lock washer on the side panel.
The line diameter must be at least 2.5 mm2.
2 – 14
A3118-X300-M100-1-76D1