ABB Advant Controller 450 User Manual

Advant
®
Controller 450 User’s Guide
Chapter 2 Installation
2-8 3BSE 002 415R701 Rev A
2.1.5 Grounding
Grounding in General
The signal processing electronics in Advant OCS, as well as all interference suppression for
external signals, are normally directly grounded to chassis and plant earth.
The plant earth potential must be stable and well defined, even in the event of ground fault in
low- and high-voltage equipment or lightning stroke. This claim for a grounding system is
common to the high-voltage equipment. The earth line joining the grounding systems should be
≥
35 mm
2
Cu.
Protective Earth
Always provide Advant OCS cabinets supplied with 230 V a.c. with a protective earth.
Grounding of Signals and Voltage Supply
For minimum interference and maximum accuracy, it is normally most effective to ground the
signals from transducers directly in the grounding bar in the Advant Controller. For freedom
from interference, it is also advantageous to ground supply voltages for transducers, sensing
voltage for contacts, load supply voltage, and so on.
You may have to deviate from these two basic rules in order to adapt to other requirements such
as measurement techniques or safety regulations. In such cases, you must ensure that,
for example, differential inputs for analog input signals are used or that digital inputs and
outputs are divided into groups in the connection unit, with the possibility of supply voltage
distribution and earthing in other equipment.
A consequence of requiring local grounding of a signal at the transducer location may be a
requirement for a completely individual voltage supply to each transducer. This normally
Figure 2-4. Grounding of Electronic Equipment
M
Earth line
≥
35 mm
2
Cabinetry
or equal
Protective
earth

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English