ISO 23570-3:2009

Industrial automation systems and integration - Distributed installation in industrial applications - Part 3: Power distribution bus

ISO 23570 specifies the interconnection of elements in the control system of machine tools and similar large pieces of industrial automation, including cable types, sizes and sheath colours, connector types and contact assignments, and diagnostic functions appropriate to the sensors and actuators. ISO 23570-3:2009 specifies the interconnection of single-phase or three-phase auxiliary motors with their power source. ISO 23570 does not address the design or operation of such equipment with respect to safety issues. It is advisable that appropriate safety standards be consulted for such requirements.

Systèmes d'automatisation industrielle et intégration — Installation distribuée dans les applications industrielles — Partie 3: Bus de distribution d'énergie

General Information

• Status: Published
• Publication Date: 17-Jun-2009
• ICS: 25.040.01 - Industrial automation systems in general
• Technical Committee: ISO/TC 184/SC 1 - Industrial cyber and physical device control
• Drafting Committee: ISO/TC 184/SC 1 - Industrial cyber and physical device control
• Current Stage: 9060 - Close of review
• Completion Date: 04-Jun-2030

Relations

• Revises: ISO 23570-3:2006 - Industrial automation systems and integration - Distributed installation in industrial applications - Part 3: Power distribution bus
• Effective Date: 18-Dec-2008

Overview

ISO 23570-3:2009 - "Industrial automation systems and integration - Distributed installation in industrial applications - Part 3: Power distribution bus" defines a standardized power-distribution system for auxiliary motors and motor controllers used in machine tools and similar industrial automation equipment. The part focuses on cable assemblies, connector types and assignments, motor controller interfaces, power supply connections and diagnostic/characterization requirements to simplify wiring, maintenance and spare-part handling for distributed installations.

Key topics and technical requirements

• Power bus topology: A trunk capable of supplying single‑phase or three‑phase auxiliary motors (spindle/high‑power motors are excluded).
• Auxiliary motor definition: Motors with an output of 5.5 kW or less.
• Cables and conductors:
  • Power-bus cables contain seven wires with a minimum conductor cross‑section of 2.5 mm².
  • Outer sheath must be resistant to common industry coolants; sheath colour specified as black.
  • Cables are characterized for applications requiring constant flex (e.g., drag chains).
• Connectors:
  • Robust, polarized connectors with positive coupling requiring no or simple hand tools.
  • Six power contacts plus protective earth (PE) with contact assignments for Phase 1–3, Neutral, and two Brake contacts.
  • Contact current capacity ≥ 10 A per contact.
  • Cable assemblies are terminated with a male connector at one end and a female at the other.
• Motor controllers and power supplies:
  • Motor controllers expected to have one male and one female connector to sit inline on the power bus; can be removable for maintenance.
  • Power supply outputs use female connectors to feed the bus.
• Environmental ratings: Components and connectors specified to meet IP65/IP67 degrees of protection (IEC 60529).
• Documentation and conformance: Annexes provide connector design specifications (multiple connector types) and reference colours; producers can claim conformance when meeting Clause 5 and/or Clause 6 requirements.

Applications and practical value

• Designed for machine tool builders, OEMs and systems integrators implementing distributed motorized subsystems in discrete part manufacturing and similar industrial processes.
• Benefits include:
  • Reduced wiring complexity and fewer cable types.
  • Lower maintenance and spare‑parts inventory.
  • Faster serviceability through standardized cable assemblies and inline motor controllers.
• Suitable for auxiliary drives, conveyors, indexing motors and other low‑power actuators in automated production lines.

Who should use this standard

• Electrical and mechanical design engineers, panel builders, maintenance managers, motor controller manufacturers, cable and connector suppliers, and plant automation teams seeking interoperable, serviceable power-distribution solutions for auxiliary motors.

Related standards

• ISO 23570-1 (Sensors and actuators) and ISO 23570-2 (Hybrid communication bus) - parts of the same series.
• IEC 60529 - specifies IP code for enclosure protection used by ISO 23570-3.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 23570-3
Second edition
2009-07-01
Industrial automation systems and
integration — Distributed installation
in industrial applications —
Part 3:
Power distribution bus
Systèmes d'automatisation industrielle et intégration — Installation
distribuée dans les applications industrielles —
Partie 3: Bus de distribution d'énergie

Reference number
©
ISO 2009
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©  ISO 2009
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ii © ISO 2009 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Conformance. 1
3 Normative references . 1
4 Terms and definitions. 2
5 Requirements for power bus . 2
5.1 General. 2
5.2 Cables and cable assemblies . 2
5.3 Connectors . 2
5.4 Motor controllers . 3
5.5 Power supplies. 3
5.6 Cable assembly termination . 3
6 Connection of motors to motor controllers .4
6.1 Connectors . 4
6.2 Cables . 9
Annex A (normative) Design specification for power bus connectors . 13
Annex B (normative) Design specification for type 1 motor/controller connectors . 19
Annex C (normative) Design specification for type 2 motor/controller connectors . 23
Annex D (normative) Design specification for type 3 motor/controller connectors . 28
Annex E (informative) Reference colours. 37
Bibliography . 38

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 23570-3 was prepared by Technical Committee ISO/TC 184, Automation systems and integration,
Subcommittee SC 1, Physical device control.
This second edition cancels and replaces the first edition (ISO 23570-3:2006), of which it constitutes a minor
revision.
The following significant changes have been made to the first edition:
a) addition of a third variant of motor connectors which is especially suitable for smaller motors, either in
physical size, in power capacity, or both, and which can be used to interconnect the motor controller and
the auxiliary motors;
b) extension and reorganizion of the contents of Clause 6 in order to describe the new motor connector;
c) addition of a new Annex D, which describes the design elements of the new motor connector;
d) renumbering of previous Annex D as Annex E.
ISO 23570 consists of the following parts, under the general title Industrial automation systems and
integration — Distributed installation in industrial applications:
⎯ Part 1: Sensors and actuators
⎯ Part 2: Hybrid communication bus
⎯ Part 3: Power distribution bus
iv © ISO 2009 – All rights reserved

Introduction
Modern machine tools for the discrete parts manufacturing industry are complex systems, consisting of
subsystems for material preparation (metal removal, material forming, etc.), material handling, fixturing and
transfer lines for moving parts from one station to another. Each subsystem, in turn, is itself a complex system,
including many sensors, actuators and control elements that receive and transmit electric signals and/or
require electric power. To reduce down time in case of failure, most of them use cable assemblies for quick
replacement. Proper operation of the system as a whole requires co-ordination of the subsystems, which
requires more cables and connectors. As a consequence of this complexity, a large variety of cables and
connectors are required for the proper operation of such a machine tool. The increasing number of sensors,
actuators and control elements leads to an increasing variety of such cable assemblies. This variety results in
increased maintenance costs due to complexity, large spare parts inventory and increased training costs for
maintenance personnel.
ISO 23570 prescribes a set of requirements for cables, connectors and parameter selections within these
elements, which, if implemented completely, will greatly reduce the wiring complexity and maintenance cost of
such machine systems. The manufacturer of such systems will benefit in terms of decreased complexity costs,
and the user of such systems will benefit in terms of decreased down time because of decreased parts
inventory and simplified maintenance training.
The technology described in ISO 23570 may have applicability to other industries and processes, i.e. there is
no intent to restrict it to discrete parts manufacturing.
The following three main areas are addressed within ISO 23570:
⎯ the interconnection of sensors and actuators to the system backbone,
⎯ a hybrid system backbone containing an information path (a fieldbus) and a source of power to the field
devices, and
⎯ a power trunk capable of providing power to all the auxiliary motors in the system.
Large power devices, such as spindle motors for metal removal, are not covered by ISO 23570.
Machine tools described in ISO 23570 are subject to constraints imposed by national and international safety
standards. ISO 23570 is intended to specify system elements that support the compliance to such standards.
Figure 1 illustrates the system components addressed in ISO 23570. In the figure, the solid cable represents
the power distribution bus providing three-phase a.c. power for electric motors. The open cable represents a
hybrid communication bus, containing both a fieldbus communication channel and low voltage power.
The centre of the figure shows a control cabinet (3) serving three sets of distribution buses. This box contains
the fieldbus communication front end, the low voltage power supplies and the three-phase power supplies.
To the left of the control cabinet are a motor with integrated electronics (1) and a fixed speed motor with a
separate motor controller (2). Both units are linked to the control cabinet by both the communication bus and
the power distribution bus.
To the right of the control cabinet are a fixed speed motor with an attached motor controller (4), a variable
speed motor with an integrated I/O module connected to several sensors and actuators (5), and another
I/O module (6) connected to several sensors and actuators, including a hydraulic/pneumatic valve. The
I/O module (6) is linked to the control cabinet only by the hybrid communication bus.
In front of the control cabinet are three more units: a motor with integrated electronics (7), another I/O module
connected to several sensors and actuators including a hydraulic/pneumatic valve (8), and a remote control
terminal (9).
Figure 1 is intended to illustrate the variety of interconnections possible using the elements of ISO 23570.
Key
1 motor with integrated electronics (e.g. a stepping motor)
2 fixed speed motor with separate motor controller
3 power distribution and control cabinet
4 fixed speed motor with attached motor controller
5 variable speed motor with integrated I/O module together with sensors and actuators
6 I/O module with a set of sensors
7 motor with integrated electronics (e.g. a stepping motor)
8 I/O module connected to a set of sensors and actuators including a hydraulic/pneumatic valve
9 remote control terminal
Figure 1 — System components addressed in ISO 23570
ISO 23570-1 provides the requirements for sensors, actuators, and I/O modules that support this system
requirement. ISO 23570-2 provides the requirements for a shared communication and low voltage power
distribution system. This part of ISO 23570 provides the requirements for distribution of power to the low
power motor systems.
While significant reduction in maintenance and operational costs may be achieved by adoption of individual
parts of ISO 23570, the greatest benefit will occur only if all parts are implemented.
This part of ISO 23570 provides requirements for the distribution of power to the low power motor systems.
vi © ISO 2009 – All rights reserved

INTERNATIONAL STANDARD ISO 23570-3:2009(E)

Industrial automation systems and integration — Distributed
installation in industrial applications —
Part 3:
Power distribution bus
1 Scope
ISO 23570 specifies the interconnection of elements in the control system of machine tools and similar large
pieces of industrial automation, including cable types, sizes and sheath colours, connector types and contact
assignments, and diagnostic functions appropriate to the sensors and actuators.
This part of ISO 23570 specifies the interconnection of single-phase or three-phase auxiliary motors with their
power source.
ISO 23570 does not address the design or operation of such equipment with respect to safety issues. It is
advisable that appropriate safety standards be consulted for such requirements.
2 Conformance
Producers of power bus cable assemblies may claim conformance to this part of ISO 23570 if they meet the
requirements of Clause 5.
Producers of motor controllers may claim conformance to this part of ISO 23570 if they meet the requirements
of Clause 5 and the requirements of Clause 6.
Producers of connectors may claim conformance to this part of ISO 23570 if they meet the requirements of
Clause 5 or the requirements of Clause 6.
Producers of motors and motor cable assemblies may claim conformance to this part of ISO 23570 if they
meet the requirements of Clause 6.
Producers of discrete part manufacturing equipment may claim conformance to this part of ISO 23570 if all the
components of the discrete part manufacturing equipment that are subject to the requirements of Clause 5
and/or Clause 6 meet those requirements.
3 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
IEC 60529:2001, Degrees of protection provided by enclosures (IP code)
4 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4.1
IP code
International Protection code
coding system to indicate the degrees of protection provided by an enclosure against access to hazardous
parts, ingress of solid foreign objects, ingress of water and to give additional information in connection with
such protection
[IEC 60529:2001]
4.2
auxiliary motor
motor capable of providing 5,5 kW power output or less
5 Requirements for power bus
5.1 General
This part of ISO 23570 specifies a cable system capable of supplying power to auxiliary motors present in the
system. Motors that power cutting spindles are outside the scope of this part of ISO 23570.
All components specified by ISO 23570 shall be rated IP65 and IP67 as defined in IEC 60529.
NOTE Components and systems covered by this part of ISO 23570 can also be subject to requirements on EMC.
5.2 Cables and cable assemblies
The cable for the power bus shall contain seven wires. The minimum cross-sectional area of a wire shall be
2,5 mm .
Cables shall have an outer sheath whose material is resistant to all common industry coolants. The supplier of
cable assemblies shall provide a list of lubricants and coolants that are compatible with the cable. The sheath
colour shall be black.
NOTE See Annex E for further elaboration of the colour specification.
A cable connector meeting the requirements of 5.3 shall terminate each end of a cable assembly. One end of
the cable assembly shall have a male connector; the other end shall have a female connector.
Some uses of such cables may require constant flexing such as use in drag chain operation. Cables shall be
characterised as to whether it is suitable for such operation.
All low voltage control cables that are not otherwise specified in ISO 23570 shall have a sheath colour of grey.
5.3 Connectors
The connectors shall have a positive coupling facility ensuring that the connectors are fully mated. The
coupling facility shall require either no tools or simple hand tools to couple or uncouple. Connectors shall be
polarised so as to avoid incorrect mating.
The contacts for the wires shall be matched in size to the cable wires to ensure physical integrity of the
connection and adequate electrical conductance. The contacts for the wires shall have a current carrying
capacity of 10 A or greater per contact.
2 © ISO 2009 – All rights reserved

The connectors shall have six contacts plus protective earth. Table 1 provides the contact assignments for
these connectors.
Table 1 — Contact assignment for power bus connectors
Contact Assignment
1 Phase 1 power
2 Phase 2 power
3 Phase 3 power
4 Neutral
11 Brake
12 Brake
PE Protective earth
NOTE Annex A provides further specification for connectors satisfying these requirements.
5.4 Motor controllers
Each motor controller shall be equipped with two connectors each meeting the requirements of 5.3, one male
connector, and one female connector. In some applications only one male connector could be sufficient
terminating the power bus.
NOTE 1 The intention is that the motor controller will be placed in the power bus so that the power is fed to the male
connector. Strict adherence to the requirements for cable assemblies and for power supplies provided in this part of
ISO 23570 will ensure that this occurs.
The use of the neutral circuit and the brake circuit specified in 5.3 is optional, depending on the requirements
of the motors being controlled.
NOTE 2 This subclause specifies requirements for motor controllers with respect to the power bus. Further
requirements on motor controllers are specified in 6.2.2 and 6.2.3.
NOTE 3 If a motor controller is addressable as part of a fieldbus network, further requirements for this motor controller
are specified in ISO 23570-2.
In some applications, it may be required that the motor controller can be removed from the power bus for
servicing without interrupting the power service to other units. The details of how this is to be accomplished
are outside the scope of this part of ISO 23570. Motor controllers shall be characterised as to whether they
are suitable for such operation.
5.5 Power supplies
Each power supply output shall be equipped with a female connector meeting the requirements of 5.3 for
transmission of power to the auxiliary motors.
NOTE If a power supply is addressable as part of a fieldbus network, further requirements for this power supply are
specified in ISO 23570-2.
5.6 Cable assembly termination
The final motor controller on the power bus shall include a cover on its downstream plug to meet
environmental requirements.
6 Connection of motors to motor controllers
6.1 Connectors
6.1.1 General
The connectors shall have a positive coupling facility ensuring that the connectors are fully mated. The
coupling facility shall require either no tools or simple hand tools to couple or uncouple. Connectors shall be
polarised so as to avoid incorrect mating.
The contacts for the wires shall be matched in size to the cable wires to ensure physical integrity of the
connection and adequate electrical conductance. The contacts for the wires shall have a current carrying
capacity of 10 A or greater per contact.
Three types of connectors are specified both for the motor and the motor controller; they differ in physical size
and number of contacts.
a) The type 1 connector has 11 contacts (10 contacts plus PE) and is a large size connector. Annex B
provides further specification for this connector. This connector supports two ancillary circuits:
⎯ AN1 is normally assigned to motor brakes;
⎯ AN2 is assigned to a temperature sensor.
NOTE 1 By proper use of the female connector of this type, a three phase motor can be configured to operate with
either star or delta wiring (see 6.1.4).
b) The type 2 connector has 9 contacts (8 contacts plus PE) and is a medium size connector. Annex C
provides further specification for this connector. This connector supports two ancillary circuits:
⎯ AN1 is normally assigned to motor brakes;
⎯ AN2 is assigned to a temperature sensor.
c) The type 3 connector has 13 contacts (12 contacts plus PE) and is a small size connector. Annex D
provides further specification for this connector. This connector supports three ancillary circuits:
⎯ AN1 is normally assigned to motor brakes but may be customized to other functions;
⎯ AN2 is assigned to the primary temperature sensor;
⎯ AN3 is customized to match the application – such uses may include a secondary temperature
sensor, fan control or stagnation heating.
NOTE 2 By proper use of the female connector of this type, a three phase motor can be configured to operate with
either star or delta wiring (see 6.1.4).
4 © ISO 2009 – All rights reserved

6.1.2 Motor connector
The motor shall be provided with a male connector of one of the three types specified in 6.1.1. Table 2
provides the contact assignments for these connectors and references to the annexes providing further
specifications.
Table 2 — Contact assignment for motor male connector
Type 1 Type 2 Type 3
a b c
connector assignment connector assignment connector assignment
Contact
Motor Motor Motor
Three phase Single phase Three phase Single phase Three phase Single phase
1 Winding end U1 Winding end U1 Winding end U1 Winding end U1 Winding end U1 Winding end U1
Winding end Winding end
2 Winding end V1 — — Winding end V1
U2 (N) U2 (N)
3 Winding end W1 — Winding end W1 — Winding end W1 —
4 AN1 AN1 AN1 AN1 AN3 AN3
5 AN1 AN1 AN2 AN2 Winding end W2 —
6 Winding end W2 — AN1 AN1 Winding end U2 —
Winding end
7 Winding end U2 — Winding end V1 Winding end V2 —
U2 (N)
8 Winding end V2 — AN2 AN2 AN3 AN3
9 AN2 AN2 — — AN1 AN1
10 AN2 AN2 — — AN2 AN2
11 — — — — AN1 AN1
12 — — — — AN2 AN2
PE Protective earth Protective earth Protective earth Protective earth Protective earth Protective earth
a
See Clause B.1.
b
See Clause C.1.
c
See Clause D.1.
6.1.3 Motor controller connector
The motor controller shall provide a connection to the motor by a female connector of one of the three types
specified in 6.1.1, either mounted on the controller or as a termination of the cable assembly hard wired to the
controller.
Table 3 provides the contact assignments for these three types of connectors and references to the annexes
providing further specifications.
Table 3 — Contact assignment for controller female connector
a b c
Type 1 connector assignment Type 2 connector assignment Type 3 connector assignment
Contact
Motor Motor Motor
Three phase Single phase Three phase Single phase Three phase Single phase
1 Phase L1 power L1 power Phase L1 power L1 power Phase L1 power L1 power
2 Phase L2 power L2 power (N) — — Phase L2 power L2 power (N)
3 Phase L3 power — Phase L3 power — Phase L3 power —
4 AN1 AN1 AN1 AN1 AN3 AN3
Shunt selector
5 AN1 AN1 AN2 AN2 —
W2
Shunt selector Shunt selector
6 — AN1 AN1 —
W2 U2
Shunt selector Shunt selector
7 — Phase L2 power L2 power (N) —
U2 V2
Shunt selector
8 — AN2 AN2 AN3 AN3
V2
9 AN2 AN2 — — AN1 AN1
10 AN2 AN2 — — AN2 AN2
11 — — — — AN1 AN1
12 — — — — AN2 AN2
PE Protective earth Protective earth Protective earth Protective earth Protective earth Protective earth
a
See Clause B.2.
b
See Clause C.2.
c
See Clause D.2.
6.1.4 Motor configuration determination
In addition to single phase motors, this part of ISO 23570 supports the operation of three phase motors in both
the delta and the star configuration. Such configuration as a delta or star operated motor may be made in one
of the three ways described below.
a) Within the motor itself
In this case, no further specification is required and the pins labelled “shunt selector” in Table 3 are not
used. This case will be denoted as the internal selection (I).
b) Within the female cable connector that couples to the motor (see 6.1.3)
This configuration is possible only if the motor connector and its matching connector are type 1 or type 3.
This case will be denoted as the local selection (L).
6 © ISO 2009 – All rights reserved

c) Within the motor controller
This configuration is possible only if both the motor connector and the controller connector are not type 2.
This case will be denoted as the remote sel
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