MIC Series Power Supplies MIC IR Power Supply Units | en 33
Bosch Security Systems, Inc. Installation Manual F.01U.141.598 | 1.0 | 2009.11
HD2 head-end provides the option for connection up to four (4)
alarm inputs to the power supply. These can be tamper
switches or inputs from other sensors or switches.
Earth isolation and termination within the unit provides correct
control of video earthing and thus prevents earth loops.
4.1 Printed Circuit Board Earth Link
The Printed Circuit Board (PCB) has one link option just below
the Mains head-end cover plate, as shown below, allowing the
power supply to be set up for different earthing schemes.
Figure 4.1 IR PSU earth link
The earth link (item 1, above) should be broken if there is a
separate connection between the video screen and the earth.
This usually occurs on copper connected systems where all the
copper video coaxes are taken back to the control room to be
connected to a central earth point. If fiber optics or other
indirect connections are used to get data and video to and from
the control room then the earth link should be left intact
provided it is the only camera end earth reference point.
WARNING!
The washer pump relay is rated only to 24 VAC or VDC
maximum voltage and is not suitable for Mains operated
pumps.
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