Power Supply Layout And Connections; Pcb Earth Link - Bosch MIC440 Installation And Operation Manual

MIC440 Explosion Protected CCTV Camera System| Installation and Operation Manual
Connecting the MIC-24PSU, MIC-240PSU or MIC-115PSU
Once installed on site please connect the composite cable from the MIC440 to the
MIC-PSU as per the following instructions.
WARNING: Electrical Danger: Ensure all power is disconnected
before opening or working upon any Power Supply Unit.
Installation must be carried out by suitably qualified persons & all
local safety regulations should be followed.
The Power Supply Unit comprises of the following:
1) A weather resistant (IP55) plastic box fitted with four cable glands.
2) A power supply for the MIC440 camera.
3) A second power supply for driving various interface cards mounted internally
to the power supply box. e.g. washer drive card, alarm interface card.
4) Provision for a signal interface card, to connect telemetry to third party
equipment.
5) Screw termination of all cable into and out of the box.
6) Correct video termination for the camera coaxial cable.
7) Earth isolation and termination within the unit to correctly control Video
earthing and thus prevent Earth loop.

Power Supply Layout and Connections

The Power supply PCB has the following connections as shown overleaf on Figure
C:-
HD1 – Power Input Connector (screw terminal)
HD2 - Tamper Switch header (screw terminal)
HD3 - Composite cable header (Connections to camera head, screw terminal)
HD4 - Telemetry header (Molex Connection)
HD5 - Telemetry header (screw terminal)
HD6 - Washer pump header (screw terminal)
HD8 - Keyboard power connector (demo purposes only, not normally fitted)
CN1 - Video out connection header (BNC)
CN2 - Add on card header (plug in)
Bosch Security Systems
Dimensions
Power supply enclosure:-225mm (W) x 70mm (H) x 195mm (D)
Figure C - MIC24PSU/MIC-240PSU/MIC-115PSU Layout

PCB Earth Link

The PCB has one link option next to HD1 to allow the power supply to be set up for
different earthing schemes: The Earth Link should be broken if there is a separate
connection between video screen and earth. 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 fibre 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.
Issue 6
EN | 17