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General setup rules

An ABB AC 31 system always includes an AC 31 central unit. There are three types of central units:

– The 40 series central unit, with a local inputs / outputs extensions interface

– The 50 series central unit, with a local inputs / outputs extensions interface

and a CS 31 bus interface

– The 90 series central unit, with a CS 31 bus interface

Each central unit incorporates a specific number of binary inputs / outputs and occasionally

analog. It is possible, depending on the central unit, to increase the number of inputs / outputs,

to add input / output extensions connected directly to the central units or remote input / output

units via the CS 31 twisted pair.

Central units with extensions

The 40 and 50 series. It’s possible to increase the number of inputs / outputs of the basic

central unit by adding up to 6 local extension units of either type, binary or analog (Figure 1-1).

2.2. Central units with CS 31 bus

The 50 and 90 series. It’s possible to increase the number of inputs / outputs of the basic

central unit by adding remote units. The central unit controlling the system is called the

MASTER central unit. The maximum bus length is 500 m without an amplifier and 2000 m with

3 amplifiers (1 NCB or NCBR unit enables bus amplification for 500 m).

AC31 maintenance seminars

Getting knowledge of the programming language and

the hardware components, possible combinations,

start-up of a model plant including trouble shooting in

the automation system, in the area of the process interface level and in the model plant itself.

AC31 project planning seminars

Project planning, programming and commissioning of

model plants. Principles of networking and the data

exchange via serial interfaces (process control). Practical training at the automation systems.

AC31 maintenance seminars

Getting knowledge of the programming language and

the hardware components, possible combinations,

start-up of a model plant including trouble shooting in

the automation system, in the area of the process interface level and in the model plant itself.

Accuray Systems

AccuRay designed, manufactured and marketed computer-based automation and management

information systems for manufacturing processes to save raw materials and energy,

increase productivity, lower costs and improve product quality. AccuRay automation systems

controlled manufacturing processes in the pulp and paper, rubber, plastics, textile and metals industries.

AccuRay systems measured the basic properties of materials, such as weight, moisture, thickness, width, opacity and component content.

The technologies for performing such measurements employed a variety of physical and electronic principles that included nuclear,

X-ray, infrared, radio frequency, optical, pneumatic and electromagnetic techniques.

AccuRay technology and expertise has helped ABB maintain its status as the leading provider

of measurement and control technologies for the Pulp and Paper industries.

Technology Trends

Technology is changing our behavior at a fast pace. A large part

of today’s modern process automation system now consists of

server-client technology, inherited from the office automation

(IT) world. With the introduction of open standards for operating

systems and standard PC hardware and software, a new

challenge was introduced to process automation system owners.

In the past there was a level of protection from frequent software

updates and constantly increasing connectivity requirements,

now these parameters are in a constant state of flux. The

industry has embraced this technology as process automation

supplier’s shift from proprietary hardware and software to

custom-off-the-shelf (COTS).

MNS incoming solutions are verified by testing in

accordance with IEC 61439 series, in addition to

IEC 60947-1 required for the individual apparatus,

and engineered to meet the requirements of

IEC 61641. This ensures ABB’s offering of ‘Proven

Safety Plus’ for operators and plant.

Incoming options

All ACBs have as a minimum the following

features:

• Manual charging lever and ‘charged’ indication

• Manual open/close push buttons

• Mechanical ‘open’/’closed’ indication

• Mechanical signalling of ‘overcurrent’ release

• 4 auxiliary contacts

Project specific options

• Gas sealed connections to the main busbars

(separation wall)

• 3 or 4 pole solutions

• Withdrawable/fixed configuration

• Top or bottom cable entry/bus duct

• 50% or 100% neutral

• Shunt opening/closing release

• Undervoltage release

• Electrical signalisation of ACB status

• Key locking facilities

• Shutter locking facilities

• Mechanical indication ‘racked in’/’racked

out’/’test isolated’ position

• Locking in racked in/racked out/test

isolated position

• Switch disconnector option

• ACB handling truck

• Configuration and test unit

Power contact

Connection to the distribution bars is realized

using the precision-engineered MNS power

contacts. The power contact is characterized by a

turn-able bearing, thus decoupling cable stress

and electrical contact. Consequently any cable

bending forces cannot affect the stability of the

power contact.

The mechanical stabilisation is taken over by

the supporting plate and the contact spring

where the contact fingers ensure positive

electrical contact. Contact fingers are silver

plated as standard.

The contact has been subjected to several tests in

order to prove the sophisticated design and the

high quality:

• Verification by testing acc. IEC 61439 series

• Corrosion test acc. DIN 50017 and

IEC 60068-2-60

• Crimping quality check acc. IEC 61238-1

• Vibration and shock test acc. IEC 60068-2-6

and IEC 60068-2-27

A condaptor unit facilitates the horizontal

distribution of power from the vertical

distribution bars for 6E/4 and 6E/2 modules, see

illustration on page 35. The condaptor enables

the modules to be located adjacently within the

same horizontal position of the cubicle.

Modules of size 6E and above are connected

directly to the vertical distribution bars.

Switchboard construction

MNS iS as part of the ABB low voltage switchgear

solution uses the well proven ABB MNS standard

design aspects. MNS aspects described in this

section are fully applicable to MNS iS.

MNS system is a verified low voltage switchgear

design in accordance with IEC 61439 series and IEC 61641.

The consistent application of the modular

principle both in electrical and mechanical design

as well as the use of standardized components

allows its flexible and compact design.

Depending on operating and environmental

conditions different design levels are offered.

Notable system advantages with regard to

design aspects:

• Optimum personal protection

• Design verified by testing

• Arc fault containment acc. criteria 1-7

• High operational reliability and availability

• Earthquake-, vibration- and shock-proof

designs are available

• Maintenance-free busbar construction

• Simple retrofitting procedures

• Compact, space-saving design

• Easy project and detail engineering through

standardised components