ABB ACS880 Series User guide

Options for ABB industrial drives
Application guide
ATEX-certified Safe disconnection function, Ex II (2) GD
ACS880
33
3~
Ex
motor
Relay
24 - 240 V AC / DC
Sensor
Potentially explosive
atmosphere
3
4
+24 V
Control
circuit
XSTO
1
2
3
4

List of related manuals
You can find manuals and other product documents in PDF format on the Internet. See section
Document library on the Internet on the inside of the back cover. For manuals not available in the
Document library, contact your local ABB representative.
General drive manuals Code (English)
Safety instructions for ACS880 multidrive cabinets and modules 3AUA0000102301
Safety instructions for ACS880 liquid-cooled multidrive cabinets
and modules
3AXD50000048633
Electrical planning instructions for ACS880 multidrive cabinets and
modules
3AUA0000102324
Electrical planning instructions for ACS880 liquid-cooled
multidrive cabinets and modules
3AXD50000048634
Drive hardware manuals and guides Code (English)
ACS880-01 drives (0.55 to 250 kW) hardware manual 3AUA0000078093
ACS880-04 drive modules (200 to 710 kW, 300 to 700 hp) hardware
manual
3AUA0000128301
ACS880-04 single drive module packages hardware manual 3AUA0000138495
ACS880-04XT drive modules (500 to 1200 kW) hardware manual 3AXD50000025169
ACS880-14 and -34 single drive module packages hardware manual 3AXD50000022021
ACS880-104 inverter modules hardware manual 3AUA0000104271
ACS880-104LC inverter modules hardware manual 3AXD50000045610
Drive firmware manuals Code (English)
ACS880 primary control program firmware manual 3AUA0000085967
PC tool manuals
Start-up and maintenance PC tool Drive composer user’s manual 3AUA0000094606
Option manuals and guides Code (English)
ACS-AP-x Assistant control panels user’s manual 3AUA0000085685
FSO-12 safety functions module user's manual 3AXD50000015612
FSO-21 safety functions module user’s manual 3AXD50000015614
FSE-31 pulse encoder interface module user’s manual 3AXD50000016597
FPTC-02 ATEX-certified thermistor protection module, Ex II (2) GD
(option +L537 +Q971) for ACS880 drives user's manual
3AXD50000027782
Manuals and quick guides for I/O extension modules, fieldbus
adapters, etc.
General safety guides
Functional safety; Technical guide No. 10 3AUA0000048753
Safety and functional safety; A general guide 1SFC001008B0201
ABB Safety information and solutions www.abb.com/safety
Potentially explosive atmospheres. The basics you need to know about
motors and drives
3AUA0000037223

Application guide
ATEX-certified Safe disconnection
function, Ex II (2) GD for ACS880 drives
(option +Q971)
3AUA0000132231 Rev D
EN
EFFECTIVE: 2018-06-13
2018 ABB Oy. All Rights Reserved.
Table of contents

5
Table of contents
1. Introduction
Contents of this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Applicability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Target audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
The ATEX-certified Safe disconnection function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Commissioning the drive for a motor in a hazardous area . . . . . . . . . . . . . . . . . . . . . . . . 9
Compliance with the European ATEX Product Directive 2014/34/EU . . . . . . . . . . . . . . . 9
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Related documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Terms and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Exclusion of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2. Implementing a motor thermal protection circuit
Contents of this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Two-channel connection to drive STO terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Resetting the safety function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Indications of the safety function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
One-channel connection to drive STO terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Resetting the safety function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Indications of the safety function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
One-channel or two-channel connection to an FSO module . . . . . . . . . . . . . . . . . . . . . 19
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Resetting the safety function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Indications of the safety function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connection diagram (two-channel connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Connection diagram (one-channel connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Protection relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
General wiring instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3. Parameter settings
Contents of this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Drive/inverter module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Switching frequency limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Reset method and status indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
31.22 STO indication run/stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Motor overtemperature indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
31.11 Fault reset selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6
Other recommended settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
FSO module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
General parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Parameters for the STO function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Parameters for the SSE function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Parameters for the SS1 function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SS1 ramp parameters in the drive/inverter module . . . . . . . . . . . . . . . . . . . . . . . 31
Safety pulse encoder interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Mechanical brake control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4. Technical data
Contents of this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Related standards and directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Safety data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Drive/inverter module STO function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Drive/inverter module STO function and an FSO module . . . . . . . . . . . . . . . . . . . . . 34
Safety block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Response times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Markings of the drive/inverter module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
ATEX certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Declarations of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Further information
Product and service inquiries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Product training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Providing feedback on ABB manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Document library on the Internet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Introduction 7
1
Introduction
Contents of this chapter
This chapter contains information on the guide and gives safety instructions and some
other general information for the reader.
Applicability
This guide is applicable to the ACS880 drives and inverter modules with the ATEX-
certified Safe disconnection function (option +Q971).
Target audience
This guide is intended for personnel who install, start-up, use and service the ATEX-
certified Safe disconnection function (option +Q971) of the drive. Read the guide before
working on the drive. You must know the fundamentals of electricity, wiring, electrical
components, electrical schematic symbols and ATEX/Ex regulations.
Safety instructions
Only qualified specialists are allowed to install, control and maintain the ATEX-certified
motor thermal protection functions (see EN IEC 60079-14). Obey all safety regulations
required with application of Ex motors in Zone 1/21 (equipment category 2) or Zone 2/22
(equipment category 2 or 3).
WARNING! Read and obey all safety instructions given for the drive. If you ignore
them, injury or death, or damage to the equipment can occur.

8 Introduction
This guide does not repeat the complete safety instructions of the drive but it only includes
the instructions related to the scope of this guide. The general instructions are given in this
section and the option-specific instructions in the appropriate chapter.
In addition to this guide,
•for ACS880 single drives, see the hardware manual
•for ACS880 air-cooled multidrive modules and single drive modules, see Safety
instructions for ACS880 multidrive cabinets and modules (3AUA0000102301
[English])
•for ACS880 liquid-cooled multidrive modules and single drive modules, see Safety
instructions for ACS880 liquid cooled multidrive cabinets and modules
(3AXD50000048633 [English]).
The safety function described in this guide activates the Safe torque off (STO) function of
the drive/inverter module. The STO function of the ACS880 drives is certified (SIL 3
according to EN/ IEC 61800-5-2 and IEC 61508). For a detailed description of the STO
function, see the hardware manual of your drive/inverter module.
WARNING! The functions described in this guide do not disconnect the voltage of
the main and auxiliary circuits from the drive. Never work on the electrical parts of
the drive or the motor before you have also disconnected the drive system from
the electric supply, from rotating permanent magnet motors and from rotating motors
equipped with sine filters, and made sure by measuring that there is no dangerous voltage
present.
WARNING! The STO function of ACS880 drives cannot prevent the intermediate
DC current from flowing through, and heating up, the motor in case a short circuit
occurs in the output stage of the drive. The supplier must take this into account
when planning the protection of the installation.
Note: When you connect the temperature sensor(s) of the Ex motor to the drive STO
terminals through a relay, ensure the availability of required reinforced (double) insulation
between the main circuit (motor) and the control unit. For example, the insulation of the
temperature sensor in the Ex motor and the insulation of the protection relay affect the
insulation of the whole circuit. All Ex motors manufactured by ABB have basic insulation
between the main circuit and the temperature sensor. Similarly, ABB protection relays
have basic insulation between the sensor circuit and relay output. This ensures double
insulation for the ATEX-certified motor thermal protection function between the main circuit
and the drive control unit.
The ATEX-certified Safe disconnection function
When the drive/inverter module is equipped with the option +Q971, its Safe torque off
(STO) function is certified as a Safe disconnection function. It can be used as a protective
system to protect equipment in potentially explosive atmospheres. The certificate is an EU
Type examination certificate in accordance with the ATEX Product Directive 2014/34/EU.

Introduction 9
Commissioning the drive for a motor in a hazardous area
Commission the drive according to the requirements and limitations set by the application,
the instructions of the motor manufacturer, drive firmware manual and local laws and
regulations.
The certificate of the Ex motor typically requires that you set a minimum limit for the output
switching frequency of the drive. Make sure that the Ex motor is operated above the
minimum output switching frequency specified by the motor manufacturer. See section
Switching frequency limitation on page 23 for instructions on how to make the setting.
Compliance with the European ATEX Product
Directive 2014/34/EU
The system integrator is responsible for the compliance of the complete motor thermal
protection circuit with the European ATEX Product Directive 2014/34/EU. If the compliance
of the system with the ATEX Product Directive requires the motor thermal protection, make
sure that the:
•drive/inverter module is equipped with the ATEX-certified Safe disconnection function
(option +Q971)
•motor thermal protection relay is ATEX-compliant
•motor thermal protection circuit is wired according to the instructions given in this
guide and in the motor manual and according to the installation requirements of the
relevant standard(s) of EN/IEC 60079 series.
Contents
This guide consists of the following chapters:
•Introduction (this chapter) introduces to this guide and gives safety instructions and
some other general information for the reader.
•Implementing a motor thermal protection circuit gives instructions for implementing an
ATEX-compliant motor thermal protection circuit using the ATEX-certified Safe
disconnection function (option +Q971) of the drive/inverter module.
•Parameter settings for the ATEX-certified motor thermal protection functions.
•Technical data contains a list of related standards and directives, safety data and the
drive ATEX certificates and Declaration of Conformity documents.
Related documents
•Product manuals (see the inside of the front cover)

10 Introduction
Terms and abbreviations
Term/
abbreviation
Description Reference
ATEX Directives 2014/34/EU and 1999/92/EC refers to the ATEX
directives (from “ATmosphères EXplosibles”).
CM-MSS.41 ABB thermistor motor protection relay
Ex An IEC term used in the context of explosive atmospheres. IEC 60079 series
Ex d Type of protection, flameproof enclosures EN/IEC 60079-1
Ex e Type of protection, increased safety, replaced with Ex eb EN 60079-7:2007 and
IEC 60079-7:2006
Ex eb, Ex ec Types of protection, increased safety EN/IEC 60079-7:2015
Ex motors Motors used in explosive atmospheres -
Ex nA Type of protection, non-sparking enclosures, replaced with
Ex ec
EN/IEC 60079-15:2010
FSE-31 Pulse encoder interface module which can be used in
safety applications
-
FSO Safety functions module (FSO-12 or FSO-21) -
FSO-12 Safety functions module which does not support the use of
safety encoders
-
FSO-21 Safety functions module which supports the FSE-31
module and the use of safety encoders
-
HFT Hardware fault tolerance IEC 61508
PFH Probability of dangerous failures per hour IEC 61508
PFD Probability of failure on demand IEC 61508
Pt100 Platinum resistance temperature detector, platinum
resistance thermometer.
-
PTC Positive temperature coefficient; PTC thermistor, PTC
resistor temperature sensor.
-
SAR Safe acceleration range. In the FSO module, there are two
sets of SAR parameters (SAR0 and SAR1) that are used to
define and/or monitor the deceleration ramp in safety
functions. SAR0 parameters are used in the SSE function.
SAR1 parameters are used in the SS1 function.
-
SBC Safe brake control. A safety function in the FSO module. -
SFF Safe failure fraction (%) IEC 61508
SIL Safety integrity level IEC 61508
SS1 Safe stop 1. A safety function in the FSO module. EN/IEC 61800-5-2
SSE Safe stop emergency. A safety function in the FSO module.

Introduction 11
Exclusion of liability
ABB is not responsible for the implementation, verification and validation of the overall
safety system. It is the responsibility of the end user (or other party) who is responsible for
the overall system, system safety and compliance with ATEX/Ex regulations.
The end user (or other responsible party) must make sure that the entire implementation
complies with all relevant standards, directives and local electrical code, and that the
system is tested, verified and validated correctly.
STO Safe torque off. In this manual, this term is used in two
different contexts:
• the STO circuit in the drive (the drive STO function)
• the STO safety function in the FSO module.
Safety functions in the FSO module (eg, STO, SSE and
SS1) activate the drive STO function, that is, open the drive
STO circuit. In addition, some safety functions can activate
the STO safety function in the FSO module, which in turn
opens the drive STO circuit.
EN/IEC 61800-5-2
Stop category 0 Uncontrolled stop EN/IEC 60204-1
Stop category 1 Controlled stop EN/IEC 60204-1
T1 Proof test interval IEC 61508
Zone An IEC term for hazardous areas. Hazardous areas are
divided into zones, according to the degree of hazard. The
degree of hazard is defined according to the probability of
the occurrence of explosive atmospheres.
EN/IEC 60079 series
Term/
abbreviation
Description Reference

12 Introduction

Implementing a motor thermal protection circuit 13
2
Implementing a motor thermal
protection circuit
Contents of this chapter
This chapter contains instructions on implementing an ATEX-compliant motor thermal
protection circuit using the ATEX-certified Safe disconnection function (option +Q971) of
the ACS880 drive/inverter module.
Overview
You can implement the motor thermal protection circuit with or without an FSO safety
functions module.
The FSO safety functions module (FSO-12 or FSO-21) is an optional device used with the
ACS880 drives to implement safety functions. When installed, it reserves the standard
STO connection of the drive. In this case, the FSO module activates the STO function of
the drive (that is, opens the drive STO circuit) either immediately or after a deceleration
ramp.
Note: You cannot connect the temperature sensor directly to the FSO module. You must
use an ATEX-compliant protection relay in between.
Without an FSO module: The opening contacts of the protection relay(s) open the STO
circuit of the drive (see sections Two-channel connection to drive STO terminals on
page 15 and One-channel connection to drive STO terminals on page 17).
With an FSO module: The opening contacts of the protection relay(s) activate the STO or
Safe stop 1 (SS1) function of the FSO module and the FSO module opens the STO circuit
of the drive (see section One-channel or two-channel connection to an FSO module on
page 19).

14 Implementing a motor thermal protection circuit
For more information on the safety functions of the FSO module, see FSO-12 safety
functions module user’s manual (3AXD50000015612 [English]) or FSO-21 safety
functions module user’s manual (3AXD50000015614 [English]).
You can also use the FPTC-02 ATEX-certified thermistor protection module, Ex II (2) GD
(option +L537+Q971) to implement the ATEX-compliant motor thermal protection function.
For more information, see FPTC-02 ATEX-certified thermistor protection module, Ex II (2)
GD (option +L537 +Q971) for ACS880 drives user’s manual (3AXD50000027782
[English]).

Implementing a motor thermal protection circuit 15
Two-channel connection to drive STO terminals
General
This section describes an implementation of the ATEX-compliant motor thermal protection
circuit. The circuit uses the ATEX-certified Safe disconnection function (option +Q971) of
the drive and a two-channel (redundant) connection to the drive STO terminals.
Resetting the safety function
A manual reset is mandatory in the temperature protection function, if it is required for
ensuring the compliance of the system with Ex/ATEX regulations. When the protection
relay detects motor overtemperature, the drive must not restart before a manual reset
command. You can implement a manual reset in the ATEX-compliant protection relay
(recommended).
In this example, it is also possible to use the STO indication in the drive to implement the
manual reset (see section Reset method and status indications on page 24).
Indications of the safety function
In this example, you can use the drive STO indication to indicate the motor
overtemperature. See section Reset method and status indications on page 24.
Note: Make sure that this indication generates a fault if the protection relay does not
contain a manual reset.

16 Implementing a motor thermal protection circuit
Connection diagram
The diagram below shows the connections. The system integrator must acquire the
components and do the installations drawn outside the drive border line.
1) An ATEX-compliant protection relay. The relay monitors a sensor circuit, and activates the STO function of
the drive by opening the control circuits when necessary.
2) You can use the drive STO function for several external safety functions at the same time (for example,
ATEX-compliant motor thermal protection and emergency stop). If you do, you must connect the STO
activation switches or relays used in other safety functions in series with the protection relay.
When you install the equipment, make sure that you maintain separation of the switching (safety) signal with
any other signals.
ACS880
33
3~
Ex
motor
3~supply
Protection relay1)
24 - 240 V AC / DC
Sensor
Potentially explosive
atmosphere
3
4
+24 V
Control
circuit
XSTO
1
2
3
4
2)

Implementing a motor thermal protection circuit 17
One-channel connection to drive STO terminals
General
This section describes an implementation of the ATEX-compliant motor thermal protection
circuit:
•The circuit uses the ATEX-certified Safe disconnection function (option +Q971) of the
drive.
•There is a one-channel (non-redundant) connection of the motor protection relay to
the drive STO terminals. Both STO inputs of the drive are connected to same output
contact of the protection relay.
•One output contact of the protection relay is connected to a digital input of the drive.
•The drive shows an overtemperature indication when the digital input switches off (the
protection relay trips).
If you plan to use the one-channel (non-redundant) connection, make sure that you can
reach the necessary safety integrity level (SIL). According to EN 50495, SIL1 is sufficient
for the protection of category 2 and 3 equipment.
Note: The STO function of the drive must always have a redundant connection. See
Connection diagram on page 18.
Resetting the safety function
A manual reset is mandatory in the temperature protection function, if it is required for
ensuring the compliance of the system with Ex/ATEX regulations. When the protection
relay detects motor overtemperature, the drive must not restart before a manual reset
command. You can implement a manual reset in the ATEX-compliant protection relay
(recommended).
In this example, you can also configure a manual reset in the drive with the motor
overtemperature or STO indication parameters (see section Reset method and status
indications on page 24).
Indications of the safety function
In this example, you can use the drive STO or the motor overtemperature indication. See
section Reset method and status indications on page 24.
If you want to avoid parallel indications in motor overtemperature situations, you can set
one or several of the indication parameters value to No indication (or None) or Event:
•the motor overtemperature indication with drive parameters 31.01...31.02 or
35.11...35.12 (see page 24),
•the STO indication in the drive with drive parameter 31.22 STO indication run/stop
(see page 24).
Note: Make sure that at least one of these indications generates a fault if the protection
relay does not contain a manual reset.

18 Implementing a motor thermal protection circuit
Connection diagram
The diagram below shows the connections. The system integrator must acquire the
components and do the installations drawn outside the drive border line.
1) An ATEX-compliant protection relay. The relay monitors a sensor circuit, and activates the Safe torque off
function of the drive by opening the control circuits when necessary.
2) You can use the drive STO function for several external safety functions at the same time (for example,
ATEX-compliant motor thermal protection, and emergency stop). If you do, you must connect the STO
activation switches or relays used in other safety functions in series with the protection relay.
3) The STO function of the drive must always have a redundant connection. Connect the XSTO terminals 3 and
4 as shown in this figure.
4) Connect to a digital input on the control board for the protection relay status indication. In this example,
digital input DI6 is in use.
When you install the equipment, make sure that you maintain separation of the switching (safety) signal with
any other signals.
+24 V
Control
circuit
ACS880
33
3~
Ex
motor
3~supply
Protection relay1)
Control
circuit
24 - 240 V AC / DC
Sensor
Potentially explosive
atmosphere
XSTO
3)
1
2
3
4
4)
2)
DI6
+24VD

Implementing a motor thermal protection circuit 19
One-channel or two-channel connection to an FSO
module
General
This section describes two implementations of the ATEX-compliant motor thermal
protection circuit with an FSO module:
•The circuit uses the ATEX-certified Safe disconnection function (option +Q971) of the
drive.
•The FSO module (FSO-12 or FSO-21) is connected to the drive STO terminals.
•The protection relay is connected to the FSO module either with:
•a two-channel (redundant) connection, or
•a one-channel connection (non-redundant). In this case, one output contact of the
protection relay is used for monitoring the status of the relay by the drive.
Note: The STO function of the drive must always have a redundant connection. See
Connection diagram (two-channel connection) on page 20 or Connection diagram (one-
channel connection) on page 21.
If you plan to use the one-channel connection in the protection relay, make sure that you
can reach the necessary safety integrity level (SIL). According to standard EN 50495, SIL1
is sufficient for the protection of category 2 and 3 equipment.
Resetting the safety function
A manual reset is mandatory in the temperature protection function, if it is required for
ensuring the compliance of the system with Ex/ATEX regulations. When the protection
relay detects motor overtemperature, the drive must not restart before a manual reset
command. You can implement a manual reset in the ATEX-compliant protection relay
(recommended).
In this example, you can also configure a manual reset either in:
•the drive with the motor overtemperature (one-channel connection only) or STO
indication parameters (see page 24)
•the FSO module by connecting a reset circuit to the FSO module (see page 26).
Indications of the safety function
In this example, an indication of the safety function can come from several sources:
•the motor overtemperature indication in the drive (one-channel connection only)
•the STO indication in the drive
•the STO indication in the FSO module.
If you want to avoid parallel indications after overtemperature activation, you can set one
or several of the indication parameters value to No indication (or None) or Event:
•the motor overtemperature indication with drive parameters 31.01...31.02 or
35.11...35.12 (see page 24),
•the STO indication in the drive with drive parameter 31.22 STO indication run/stop
(see page 24),
•the STO indication in the FSO module with FSO parameter FSOGEN.61 STO
indication ext request (see page 27).
Note: Make sure that at least one of these indications generates a fault if the protection
relay does not contain a manual reset.

20 Implementing a motor thermal protection circuit
Connection diagram (two-channel connection)
The diagram below shows the wiring of the two-channel connection. The system integrator
must acquire the components and do the installations drawn outside the drive border line.
1) An ATEX-compliant protection relay. The relay monitors a sensor circuit, and de-energizes the FSO module
input by opening the control circuits when necessary.
When you install the equipment, make sure that you maintain separation of the switching (safety) signal with
any other signals.
Control
circuit
ACS880
333~
Ex
motor
Protection relay1)
24 - 240 V AC / DC
Sensor
Potentially explosive
atmosphere
XSTO
FSO
1
2
3
4
1234 1 2
24 V / 1 A
X111 X112
X110 X112
1234…10
1234…10
X113
X114