MIC412TI and MIC412TF Camera Installation and Operation Manual
Earthing of the MIC 412 camera
1.The camera module and housing are electrically isolated so the housing should be safety earthed regardless. The safety earth should be a bonding connection to the cameras outside case for example one of the securing bolts.
2.The camera should be earthed at one point only to prevent earth loops & thus hum bars showing on the control room monitor.
3.If the system is copper throughout & the camera pictures are fed back to the control room coaxial copper cable, then the camera should be earthed at the video termination point in the control room & nowhere else. In this case the PCB “Earth Link” should be broken.
4.If the video is transmitted back to the control room via some non electrical connecting medium, e.g. fibre optic, radio or microwave link, then the camera should be earthed at the transmitter point in the PSU. The PSU “Earth Link” may be used for this purpose.
5.If dual earthing is unavoidable then a video isolation transformer should be fitted between the two earths.
Lightning Protection
If the camera is fitted in a highly exposed place then consideration should be given to lightning protection. A good earth bonding connection to the case itself will provide protection against damage from secondary strikes.
Where there is a risk of a primary strike hitting the camera housing directly, it is recommended that a separate lightning conductor be fitted within 0.5m of the camera and at least 1.5 m higher than the camera.
The construction of the housing itself is very capable of coping with secondary strikes and no damage to the internal electronics or camera should result if correct lightning protection is applied.
EN 14
Electrical Connections
WARNING: Electrical Danger: Ensure all power is disconnected before opening or working upon the Power Supply Unit.
Installation must be carried out by suitably qualified persons. Ensure that the National Electric Code, ANSI/NFPA, Canadian Electric Code, and all local country codes are observed.
A purpose built composite cable for use with the camera is available; these cables are
The composite cable has no termination (free wires) at the other end for wiring into the appropriate power supply. The standard colour coding used in these cables is as shown below.
Table A – MIC412 Composite Cable Pin table
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| Connector Pin |
| Signal Name |
| Wire Colour |
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| A |
| Video Output |
| Coax core |
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| B |
| Video Return |
| Coax screen |
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| C |
| Tamper Sw |
| Black |
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| D |
| Tamper Sw Rtn |
| Brown |
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| E |
| Washer drive Rtn |
| Grey |
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| F |
| Washer drive |
| Orange |
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| G |
| Full Duplex Tx A. |
| Blue |
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| H |
| Full Duplex Tx B. |
| Violet |
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| I |
| Full Duplex Rx A. |
| Yellow |
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| Half Duplex Tx/Rx A. |
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| K |
| Full Duplex Rx B. |
| White |
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| Half Duplex Tx/Rx B. |
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| L |
| Power input 1. |
| Red |
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| M |
| Power input 2. |
| Green |
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Bosch Security Systems | Issue 8 |
