ABB Advant Controller 450 User Manual

Advant
®
Controller 450 User’s Guide
Section 2.2.5 Grounding
3BSE 002 415R701 Rev A 2-19
2.2.5 Grounding
This section shows you where to ground in an Advant Controller cabinet. If necessary, it also
shows you how to ground.
You should be aware of the common Advant OCS Installation Rules, which establish the
principles of grounding and answer the questions of when a piece of equipment, a circuit or a
cable shield should be grounded and why it should be grounded. It also gives alternative
solutions adapted to specific plant requirements.
2.2.5.1 General
A RM500 cabinet forms a stable ground plane for all equipment accommodated.
The signal processing electronics in the controller, as well as all interference suppression for
external signals, are normally directly grounded to chassis and plant earth.
2.2.5.2 Protective Earth
The mains distribution normally includes a protected earth (PE) wire. Connect this to the PE
terminal block on the primary Power Switch Unit or the Mains Net Filter, if included. (See the
circuit diagram enclosed at delivery.)
You are directed to use cable lug connectors when connecting to any earth screw.
2.2.5.3 Earth Line
Ground the cabinet with a copper lead (
≥
35 mm) to the plant earth line.
Use the left front M10 marked “Protection Ground” of the four screws placed in the corner of
the cabinet floor. You are directed to use a cable lug connector.
One common connection from a row of cabinets is sufficient. The cabinets should be well
bounded together.
2.2.5.4 Grounding of Process Cable Shields
General
Advant OCS or rather the application itself put some limited requirement on cable shielding.
Only a few types of process signals must be shielded and treated in a special way in the
controller cabinet. In the continued description of CE-marked and not CE-marked controller
design these cables are denoted category A and they include:
• Low level analog input signals
– Accuracy requirement shall be greater or equal to 12 bits
– Pt 100 and Thermocouple.
• High-frequency pulse transmitter signals.
Normally a single shield is used and it is grounded in the controller end of the cable.
Sometimes the application require a local grounding of the cable shield close to the transducer.
Specific rules apply then.

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English