Innotech Genesis V4 System User Manual

Page 102

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Installation Instructions for Innotech Genesis Systems

Edition 011100

A-21

Figure A-20 shows the same arrangement as that shown in Figure A-19 but with the screen
earthed in Control Panel No. 1 and GENII 485I cards fitted to all other Digital Controllers.
This provides the same degree of isolation but is more expensive because three isolator
cards are needed. All Digital Controllers remote from the point where the screen is earthed
must be fitted with GENII 485I cards. This does not remove the hazard of the earth voltage
in Control Panel No. 1 being present on the screen of the Comms cable in Control Panel
No. 2.

Figure A-20. Use of GENII 485I Card, Circuit 2.

Switchboard or

Control Panel No. 2

Switchboard or

Control Panel No. 1

Screen

1 2

Connect Screen

Isolated

RS485

GEN485I Card

isolates Digital

Controller from

cable.

Screen

1 2

Connect Screen

Isolated

RS485

GEN485I Card

isolates Digital

Controller from

cable.

Screen

1 2

Connect Screen

Isolated

RS485

GEN485I Card

isolates Digital

Controller from

cable.

Screen

1 2

Connect Screen

Six outer links

fitted. Screen is

earthed via
Terminal 2.

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