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Atlas Copco Airpower NV

ELEKTRONIKON MkIV Compressor Area Network (CAN) Cabling Instructions

Name

Secr. Class

Technical Note : Compressor Network C

abling Instruction
Detail

1102 K/1
Owner

PC
Edition

AII

01
Family Design Checked

Modified from Written By

:
Compare Replaces Date

print date

21/12/05
Designation

CTE
Product Checked Approved

27/10/2005

9820 3582 00

9820 3582 00 Ed.01

Preface
This document describes how to prepare a Compressor Area Network (CAN) both physically and logically. The physical sections discuss the cabling for MkIV compressor controllers, while the logical part explains the use of ‘address’ or ‘node ID’s’ in the compressor network.. This manual describes the use of the standard Atlas Copco components. For the use of other available components check the accompanying instruction manuals

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Table of Contents 1.
1.1 1.2 1.3 1.4

The Physical Network________________________________________________4
The Components________________________________________________________ 4 Connectors ____________________________________________________________ 5 Cable _________________________________________________________________ 6 Connector Cabling Procedure _____________________________________________ 6
Terminal Connector Cabling ___________________________________________________7 Node Connector Cabling ______________________________________________________8 Line Termination ____________________________________________________________9

1.4.1 1.4.2 1.4.3

1.5

Repeater Cabling Procedure _____________________________________________ 10

2.

The Logical Network________________________________________________13

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1. The Physical Network
1.1 The Components
Each Elektronikon MkIV network is composed of - maximum 26 machines (compressors, dryers, blowers etc.) o with MkIV controllers o or with Mk1/2 and MkIII controllers, upgraded with MkIV Communication Processors that are programmed for RS232C to MkIV Network Conversion - maximum 2 MkIV Communication Processors programmed for Modbus or Profibus - maximum 1 Energon or ES controller of the Elektronikon MkIV generation Each device is connected to the Compressor Network through its LAN connector, in a ‘bus’ topology, i.e. starting from Device 1 to 2, from 2 to 3,…

This topology requires 2 cables to be connected to each device (except first and last), though there is only 1 connector foreseen on the MkIV devices. Therefore special connectors, as described below, are used, allowing the incoming and outgoing cables to be attached to the device using 1 single connection point. Another advantage is that the devices can be disconnected, without destroying the network.

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1.2 Connectors
The connectors exist in two variants: normal node and service node. A service node can be used on the device where the service computer will be connected. It allows the connection of another device without disconnecting any other device. There can be as many service points a needed, but only one can be connected to a PC at any one time. Normal connector : 1088 0017 28 – pictured below on the left Service connector : 1088 0017 27 – pictured below on the right

Service CAN connector

Normal CAN connector

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1.3 Cable
The Atlas Copco BUS-CAN cable (1 pair + ground) should be used to connect the machines and controllers together. This cable has been fully tested and qualified for use with Atlas Copco equipment and as such is the only CAN cable Atlas Copco recommends. Atlas Copco Part Number. 0017 2610 13 per metre Atlas Copco Part Number. 1900 0707 92 for reel of 305m This cable is in accordance with ISO 11898 and allows network segments of maximum 250m. A total network length of 500m is possible, but then a repeater has to be used as described in paragraph 1.5.

1.4 Connector Cabling Procedure
Prepare the end of each cable for the CAN connector by removing either 45mm or 60mm of the cable insulation, depending on whether the cable is incoming or outgoing. Next, remove the plastic foil, leaving 10mm of cable shielding. Then remove the fill-up material and the white/blue conductor. Finally, remove 5mm of insulation from the blue, orange and white/orange conductors.

10mm

10mm

45mm Incoming CAN cable preparation

60mm Outgoing CAN cable preparation

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1.4.1 Terminal Connector Cabling
For the connector at the beginning and end of the network, the cable should be connected to the terminals designated 1C-, 1C+, and GND, as shown below. Make sure that the wire shielding touches the shielding plate of the connector. Close the connector and set the terminating switch to ON. Plug the connector into the LAN port of the device, which can be found on the back of machine regulators and on the front of the AIRmonitor box.

The CAN wires should be connected inside the CAN connector as follows: ? ? ? Blue wire to terminal GND White/orange wire to terminal 1COrange wire to terminal 1C+

Connector wiring for the beginning or end of the network

The switch on the back of the connector should be in the “ON” position for connectors at the beginning and end of the network Important Be absolutely sure that the cable is connected to the correct terminals inside the start and end connectors. Failure to do this will prevent the network from functioning properly and will certainly mean that the start and/or end machines do not become connected to the network at all.

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1.4.2 Node Connector Cabling
For the connectors in the middle of the network, connect the wires as follows: Incoming Wire o Blue wires to terminal GND o White/orange wires to terminal 1Co Orange wires to terminal 1C+ Outgoing Wire o Blue wires to terminal GND o White/orange wires to terminal 2Co Orange wires to terminal 2C+ Make sure that the wire shielding touches the shielding plate of the connector. Close the connectors and set the terminating switches OFF. Plug the connector into the LAN port of the device, which can be found on the back of machine regulators and on the front of the AIRmonitor box.

Wiring for connectors in the middle of the network

The switch on the back of the connector should be in the “OFF” position for connectors in the middle of the network

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1.4.3 Line Termination
Correctly "terminating" the CAN network is important for a properly functioning network. This is done by inserting so-called line termination resistors at the beginning and at the end of the network cable.
1 2 N-1 N

OFF

ON

In the connectors as specified above, this termination function is included and can be set by means of a small terminator switch. Make sure this switch is in the ON position for both the first and last device, and in the OFF position for all other devices. Both connector types are equipped with this switch …

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1.5 Repeater Cabling Procedure
Whenever the network length exceeds 250m, a repeater needs to be used. This way, a total network length of maximum 500m can be achieved. The location of the repeater in the CAN network depends on the network structure, but should always be around 250m. Necessary components: Atlas Copco CAN Repeater : AC Nr. 1089 9543 01

The repeater can be mounted on a DIN-rail and requires a power supply of 9-35V DC. Suggested power supply : OMRON S82K-00324 : AC Nr. 1089 0457 73 Make sure the DIN-rail on which the repeater is mounted is connected to ground. Since there is no shielding connection available on the repeater, the cable shieldings of both network segments can be grounded by using a DIN-rail mountable shielding carrier and shielding clamping saddle. Shielding carrier : AC Nr. 1088 0034 02 Shielding clamping saddle : AC Nr. 1088 0034 01

To integrate the repeater in the CAN network, first of all remove 150 mm of the cable insulation and plastic foil, leaving 20 mm of cable shielding. Then remove the fill-up material and white conductor. Finally, strip the blue, orange and white conductors such that 7mm of bare wire is exposed.

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Next, place the shielding carrier on the DIN-rail, unscrew the shielding clamping saddles and click them on the carrier.

Insert a cable segment in each clamping saddle and firmly screw down the saddles to make sure the cable shielding makes contact with the carrier .

Put the repeater on the DIN-rail, next to the shielding carrier and connect both segments to the repeater.

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The CAN connections on the repeater are: Segment 1 : 6 : CAN High 7 : CAN Low 8 : GND : Orange : White/Orange : Blue

Segment 2 :

3 : CAN High 4 : CAN Low 5 : GND

: Orange : White/Orange : Blue

Finally, connect the power supply to the repeater. Pin 1 : 9-35V DC Pin 2 : GND

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2. The Logical Network
The AC network (as any network) requires that each device connected to it has its own address, also referred to as Node ID. The AC compressor net allows for 31 different addresses: 1 to 31. On each AC device it will be possible to change this value, either from the display, or by means of special switches on the apparatus itself. As standard each device has node ID 31 as factory setting. This value should not be used in a real network, to allow the fast and easy integration of new devices on a running network. If none of the devices in a net has ID 31, a new compressor can safely be connected to the net with default values. (however change the ID asap to another valid value) Following rules should be followed : ? Each device on the same net should have a different node ID ? Node ID 31 is for default purpose only, always change this ID once the device is installed ? Some applications require fixed node ID’s for some device, please check in the application manuals e.g. the Energon 1 sequencer only operates on devices 1,2,3 and 4 !!!

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