A-4.2.2. genesis i connections – Innotech Genesis V4 System User Manual

Page 88

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Installation Instructions for Innotech Genesis Systems

Edition 011100

A-7

A-4.2.2.

Genesis I Connections.

The Common connection provided by the tracks

on the printed circuit board permanently links the following points:

Terminal 2 (the Zero Volts of the AC supply)

Terminals 19 and 20 (the connections for the screens of the analogue inputs)

Terminal 91 (the connection for the screen of the Comms cable)

The shell and Pin 5 of the DB9 connector for RS232.

If the screen of the Comms cable is connected into Terminal 91, the screen will be earthed
via the earth connection on Terminal 2. To isolate the screen at a Genesis I Digital
Controller, the screen must not be connected to Terminal 91. To maintain the continuity of
the screen, it has to be joined externally from the Genesis I Digital Controller. Refer to
Figure A-7.

Figure A-7. Genesis I Connections.

Internal Connection to

Terminal 91 is Fixed &

Cannot be Opened.

1 2

19 20

Screen

89 90 91 92 93

Terminals 2, 19 & 20

(Screen), 91 & Pin 5

of RS232 are Joined

InsideThe Digital

Controller.

END CONNECTION,

SCREEN CONNECTED

89

90

91

92

93

89

90

91

92

93

89

90

91

92

93

LOOPING CONNECTION,

SCREEN CONNECTED

89

90

91

92

93

EQUIVALENT CIRCUIT

Screen Continuity Maintained

by Joining at Terminal 91

89

90

91

92

93

89

90

91

92

93

89

90

91

92

93

Screen Isolated From

Digital Controller Ground

by NOT Connecting at

Terminal 91

LOOPING CONNECTION, SCREEN ISOLATED

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