Nord Drivesystems SK 500P Series Instructions and recipes

BU 0630 – en
Functional Safety
Supplementary manual for series SK 500P

Functional Safety – Supplementary manual for series SK 500P
2 BU 0630 en-2020

1 Introduction
BU 0630 en-2020 3

Functional Safety – Supplementary manual for series SK 500P
4 BU 0630 en-2020
Pos: 3/ A ll gem ei n/ S t euer m od ul e/ In h alts v er zei c h nis @ 0\mod_1317978518480_388.docx@ 4078@ @ 1
Table of Contents
=== En de d er List e f ür T ex tm ar ke Inh alts v er z eic h nis = ==
1Introduction .................................................................................................................................................6
1.1 General ..............................................................................................................................................6
1.1.1 Documentation .....................................................................................................................6
1.1.2 Document history..................................................................................................................6
1.1.3 About this manual.................................................................................................................7
1.2 Other applicable documents ..............................................................................................................7
1.3 Presentation conventions...................................................................................................................7
1.3.1 Warning information .............................................................................................................7
1.3.2 Other information..................................................................................................................7
1.4 Safety, installation and application information ..................................................................................7
2Function description.................................................................................................................................11
2.1 Design of the safe shut-down method..............................................................................................11
2.2 Safe shut-down methods .................................................................................................................12
2.2.1 Safe Pulse Block ................................................................................................................12
2.2.2 Safety Digital Input .............................................................................................................13
2.3 Safety functions ...............................................................................................................................14
2.3.1 Safe Torque Off, STO.........................................................................................................14
2.3.2 Safe stop 1 with time control, SS1-t....................................................................................15
2.3.3 Priorities and response to faults .........................................................................................15
2.4 Examples / Implementation..............................................................................................................15
2.4.1 STO function.......................................................................................................................15
2.4.2 SS1-t function.....................................................................................................................19
2.4.3 Simple re-start block...........................................................................................................21
2.4.4 Example without Safe Pulse Block .....................................................................................22
2.4.5 Exclusion of wiring faults ....................................................................................................25
3Assembly and installation ........................................................................................................................28
3.1 Installation and assembly.................................................................................................................28
3.1.1Assembly of an SK CU5-STO and SK CU5-MLT customer unit.........................................28
3.2 Electrical connection ........................................................................................................................29
3.2.1 Wiring guidelines ................................................................................................................29
3.2.2 Mains connection................................................................................................................29
3.2.3 Control cable connections ..................................................................................................31
3.2.4 Control terminal details.......................................................................................................31
3.3 Details of the safe shut-down method..............................................................................................32
3.3.1 Wiring and shielding ...........................................................................................................32
3.3.2 Operation with OSSD .........................................................................................................32
3.3.2.1 Individual operation 33
3.3.2.2 Multiple device operation 34
3.3.3 EMC ...................................................................................................................................35
4commissioning..........................................................................................................................................36
4.1 Commissioning steps for STO .........................................................................................................36
4.2SS1-t commissioning steps..............................................................................................................37
4.3 Validation .........................................................................................................................................40
5Parameters.................................................................................................................................................41
5.1 Parameterisation..............................................................................................................................41
5.2 Description of parameters................................................................................................................42
5.2.1 Control terminals ................................................................................................................43
5.2.2 Additional parameters.........................................................................................................47

1 Introduction
BU 0630 en-2020 5
6Operating status messages .....................................................................................................................48
7Additional information ..............................................................................................................................51
7.1 Protective switching devices ............................................................................................................51
7.1.1 Output voltage of safety devices.........................................................................................51
7.1.2 Switching capacity and current load ...................................................................................51
7.1.3 OSSD outputs, test pulses .................................................................................................53
7.2 Safety categories .............................................................................................................................54
7.2.1 IEC 60204-1:2016 ..............................................................................................................54
7.2.2 IEC 61800-5-2:2016 ...........................................................................................................54
7.2.3 IEC 61508:2010..................................................................................................................54
7.2.4 ISO 13849-1:2015 ..............................................................................................................55
8Technical Data...........................................................................................................................................56
8.1 Safe Pulse Block and Safety Digital Input........................................................................................56
9Appendix....................................................................................................................................................58
9.1 Maintenance information..................................................................................................................58
9.2 Repair information............................................................................................................................58
9.3 Service and commissioning information...........................................................................................59
9.4 Documents and software .................................................................................................................59
9.5 Certificates .......................................................................................................................................59
9.6 Abbreviations ...................................................................................................................................60
Pos: 6/ A nl eit ung en /El ek tr oni k /B us sys tem e/ Al le Baur ei h en/ 1. ( 1 .)Ei nlei t ung / !K a pitel Ei nlei t ung @ 8\mod_1441625462919_388.docx @2235978@ 1 @ 1

Functional Safety – Supplementary manual for series SK 500P
6 BU 0630 en-2020
1 Introduction
Pos: 7/ A nl eit ung en /El ek tr oni k /B us sys tem e/ Al le Baur ei h en/ 1. ( 1 .)Ei nlei t ung / !A bsc h ni tt Al lg em ei n es @ 8\mod_1441352725095_388.docx@ 2235719@ 2 @ 1
1.1 General
Pos: 11 /A nl eitu ng e n/ Elek tro ni k/ Sa fe ty / 1. Ei nl ei t ung/ D ok um e nt ati on ( sa fet y ) [ SK 5x x P] @ 44\m od_1593165143738_388.docx@ 2638668@ 3 @ 1
1.1.1 Documentation
Designation: BU 0630
Part number: 6076302
Series:
Functional safety for frequency inverters from the
series
NORDAC PRO SK 500P
Scope of application: • Frequency inverters with integrated safety inputs:
SK 510P, SK 540P
• Frequency inverters in combination with customer
unit extensions with safety inputs: SK 530P,
SK 550P
• Customer unit extensions: SK CU5-STO, SK_CU5-
MLT
• From NORDAC PRO software version V1.2 R0
Pos: 15 /A nl eitu ng e n/ Elek tro ni k/ Sa fe ty / 1. Ei nl ei t ung/ D ok um e nt hist or i e [S af ety : SK 5xx P] @ 4 4\mod_1594729085636_388.docx@ 2645361@ 3 @ 1
1.1.2 Document history
Edition Series Version Remarks
Order number Software
BU 0630,
July 2020
SK 500P
V1.2 R0
First edition
6076302/ 2020
Pos: 16 /Al lg em ein/ Allg em eing ül tig e M od ul e/---------Seite num br uc h k om pak t --------- @ 13 \mod_1476369695906_0.docx@ 2265495@ @ 1

1 Introduction
BU 0630 en-2020 7
Pos: 17 /A nl eitu ng e n/ Elek tro ni k/ Sa fe ty / 1. Ei nl ei t ung/ Z u di e sem Hand b uch [Sa fe ty ] @ 16\mod_1487169353324_388.docx@ 2327660@ 3 @ 1
1.1.3 About this manual
This manual is intended to help you with the commissioning of the Safe Stop function (STO or SS1-t)
with a frequency inverter from Getriebebau NORD GmbH & Co. KG (NORD). It is intended for
qualified electricians who plan, install and set up corresponding drive solutions (Section 1.4 "Safety,
installation and application information"). The information in this manual assumes that the qualified
electricians who are entrusted with this work are familiar with the handling of electronic drive
technology, in particular with NORD devices.
This manual only contains information and descriptions of the functional safety and additional
information which is relevant for the functional safety of frequency inverters manufactured by
Getriebebau NORD GmbH & Co. KG.
Pos: 20 /A nl eitu ng e n/ Elek tro ni k/ PO SIC ON/ 1. Einl ei tu ng /Mi tg el te n de D ok um ente [POS IC ON , P LC , S af ety ] @ 1 4\mod_1479993719061_388.docx@ 2308206@ 2 @ 1
1.2 Other applicable documents
This document is only valid in combination with the operating instructions for the frequency inverter
which is used. Safe commissioning of the drive application depends on the availability of the
information contained in this document.. A list of the documents can be found in Section 9.4
"Documents and software".
The necessary documents can be found under www.nord.com.
Pos: 21 /A nl eitu ng e n/ Elek tro ni k/ Bus s yst em e/Al l e Ba ur ei he n/ 1. (1.) Ei nl ei tu ng/ ! A bsc hni t t D ars t ell ung sk o nv enti one n @ 8\mod_1441373607811_388.docx@ 2235851@ 2 @ 1
1.3 Presentation conventions
Pos: 22 /A nl eitu ng en/ Elek tr oni k/ Bus sys tem e/ All e Ba urei he n/ 1. ( 1.) Einl ei tung /W ar nhi nw eise @ 8\m od_1441373791790_388.docx@ 2235882@ 33 @ 1
1.3.1 Warning information
Warning information for the safety of the user and the bus interfaces are indicated as follows:
DANGER
This warning information warns against personal risks, which may cause severe injury or death.
WARNING
This warning information warns against personal risks, which may cause severe injury or death.
CAUTION
This warning information warns against personal risks, which may cause slight or moderate injuries.
NOTICE
This warning warns against damage to material.
1.3.2 Other information
Information
This information shows hints and important information.
Pos: 24 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s-, I nst al la ti o ns- un d Anwe ndung shinw eise _01 [alle G erät e -für Handbuecher BU....]@ 17\mod_1488973491253_388.docx@ 2333815@2 @ 1
1.4 Safety, installation and application information
Pos: 25 /A nl eitu ng e n/ Elek t ro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - und I nstal lati onshi nweise u nd War n- Gef ahr en hinw eis e/ ne u/ Si c her hei t s-, I nst al l at io ns- un d A nw e nd ung s hi nwei s e _0 2 [ al l e G erä te ] @ 12\mod_1466690028867_388.docx@ 332586@ @1
Before working on or with the device, please read the following safety instructions extremely carefully.
Please pay attention to all other information from the device manual.
Non-compliance can result in serious or fatal injuries and damage to the device or its surroundings.

Functional Safety – Supplementary manual for series SK 500P
8 BU 0630 en-2020
These safety instructions must be kept in a safe place!
Pos: 26 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s- u n d Ins t all a tio ns hi nw ei se - Einz el p unk te/ 1. Allg emei n ( Sic h erh ei ts hinw ei se) [SK 2xx E, SK 1xxE ] @ 1 9\m od_1508746494449_388.docx@ 2368636@ @ 1
1. General
Do not use defective devices or devices with defective or damaged housings or missing covers (e.g.
blind plugs for cable glands). Otherwise there is a risk of serious or fatal injuries caused by electric
shock or bursting electrical components such as powerful electrolytic capacitors.
Unauthorised removal of covers, improper use, incorrect installation or operation causes a risk of
serious personal injury or material damage.
During operation and depending on the protection class of the devices, there may be live, bare,
moving or rotating parts or hot surfaces.
The device operates with a dangerous voltage. Dangerous voltage may be present at the supply lines,
contact strips and PCBs of all connecting terminals (e.g. mains input, motor connection), even if the
device is not working or the motor is not rotating (e.g. caused by electronic disabling, jamming of the
drive or a short circuit at the output terminals).
The device is not equipped with a mains switch and is therefore always live when connected to the
power supply. Voltages may therefore be connected to a connected motor at standstill.
Even if the drive unit has been disconnected from the mains, a connected motor may rotate and
possibly generate a dangerous voltage.
If you come into contact with dangerous voltage such as this, there is a risk of an electric shock, which
can lead to serious or fatal injuries.
The device and any power plug connectors must not be disconnected while a voltage is applied to the
device. Failure to comply with this may cause arcing, which in addition to the risk of injury, also results
in a risk of damage or destruction of the device.
The fact that the status LED or other indicators are not illuminated does not indicate that the device
has been disconnected from the mains and is without voltage.
The heat sink and all other metal components can heat up to temperatures above 70 °C.
Touching these parts can result in local burns to the body parts concerned (cooling times and
clearance from neighbouring components must be complied with).
All work on the device, e.g. transportation, installation, commissioning and maintenance work must be
carried out by qualified experts (observe IEC 364 or CENELEC HD 384 or DIN VDE 0100 and
IEC 664 or DIN VDE 0110 and national accident prevention regulations). In particular, the general and
regional installation and safety regulations for work on high voltage systems (e.g. VDE) must be
complied with as must the regulations concerning correct use of tools and the use of personal
protection equipment.
During all work on the device, take care that no foreign bodies, loose parts, moisture or dust enter or
remain in the device (risk of short circuit, fire and corrosion).
Further information can be found in this documentation.
Pos: 28 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s- u n d Ins t all at io nshi nw eise - Ei nz elp unk te /2. Q u ali fizi er tes Fac h pers on al ( Si ch erh eits hi nw ei s e) @ 12\m od_1466690573079_388.docx @ 332620@ @ 1
2. Qualified experts
For the purposes of these basic safety instructions, qualified personnel are persons who are familiar
with the assembly, installation, commissioning and operation of this product and who have the
relevant qualifications for their work.
Furthermore, the device and the associated accessories may only be installed and started up by
qualified electricians. An electrician is a person who, because of their technical training and
experience, has sufficient knowledge with regard to
• switching on, switching off, isolating, earthing and marking power circuits and devices,
• proper maintenance and use of protective devices in accordance with defined safety standards.
Pos: 29 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s- u n d Ins t all a tio ns hi nw ei se - Einz el p unk te/ 3. Besti mm u ngs gem äß e V er we ndu ng – al lg em ei n ( Si ch erh ei ts hi nwei s e) [ all e FU - auß er S K 5 xx E ] @ 1 2\mod_1466686844876_388.docx @ 332279@ @ 1

1 Introduction
BU 0630 en-2020 9
3. Correct purpose of use – general
The frequency inverters are devices for industrial and commercial systems used for the operation of
three-phase asynchronous motors with squirrel-cage rotors and Permanent Magnet Synchronous
Motors – PMSM. These motors must be suitable for operation with frequency inverters, other loads
must not be connected to the devices.
The devices are components intended for installation in electrical systems or machines.
Technical data and information for connection conditions can be found on the rating plate and in the
documentation, and must be complied with.
The devices may only be used for safety functions which are described and explicitly approved.
CE-labelled devices fulfil the requirements of the Low Voltage Directive 2014/35/EU. The stated
harmonized standards for the devices are used in the declaration of conformity.
a. Supplement: Correct purpose of use within the European Union
When installed in machines, the devices must not be commissioned (i.e. commencement of
proper use) until it has been ensured that the machine fulfils the provisions of EC Directive
2006/42/EC (Machinery Directive); EN 60204-1 must also be complied with.
Commissioning (i.e. start-up of proper use) is only permitted if the EMC directive (2014/30/EU)
has been complied with.
b. Supplement: Correct purpose of use outside the European Union
The local conditions of the operator for the installation and commissioning of the device must be
complied with at the usage location (see also "a) Supplement: Correct purpose of use within the
European Union").
Pos: 30 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s- u n d Ins t all a tio ns hi nw ei se - Einz el p unk te/ 4_ a. T r an sp ort, Ei nlag er ung ( Sic her h eits hi nw eis e) @ 19\mod_1508761292824_388.docx@ 2369021@ @ 1
Transport, storage
The information in the manual regarding transport, storage and correct handling must be complied
with.
The permissible mechanical and climatic ambient conditions (see technical data in the manual for the
device) must be complied with.
If necessary, suitable, adequately dimensioned means of transport (e.g. lifting gear, rope guides) must
be used.
Pos: 31 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s- u n d Ins t all a tio ns hi nw ei se - Einz el punk te /4 _b. Aufst ell ung un d M on tage ( Sic her hei ts hi nw eise) @ 19 \mod_1508741535965_388.docx@ 2368416@ @ 1
Installation and assembly
The installation and cooling of the device must be implemented according to the regulations in the
corresponding documentation. The permissible mechanical and climatic ambient conditions (see
technical data in the manual for the device) must be complied with.
The device must be protected against impermissible loads. In particular, components must not be
deformed and/or insulation distances must not be changed. Touching of electronic components and
contacts must be avoided.
The device and its optional modules contain electrostatically sensitive components, which can be
easily damaged by incorrect handling. Electrical components must not be mechanically damaged or
destroyed.
Pos: 32 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - und Instal lati on shi nw eis e u nd W ar n- Gef ahr enhi nw ei s e/ ne u/ Si c her hei t s- u n d I ns t all a tio ns hi nw ei se - E i nz elp unk te /4 _c. El ektr is c her A nsc hl us s (Si c h erh eits hi nw eis e) [dez en tral e G er äte ] @ 40\mod_1582025990419_388.docx@ 2590430@ @ 1
Electrical connection
Ensure that the device and the motor are specified for the correct supply voltage.
Installation, maintenance and repair work must not be carried out unless the device has been
disconnected from the voltage and at least 5 minutes have elapsed since the mains was switched off!
(Due to charged capacitors, the equipment may continue to carry hazardous voltages for up to 5
minutes after being switched off at the mains). Before starting work it is essential to check by
measurement that all contacts of the power plug connections or the connection are voltage-free.

Functional Safety – Supplementary manual for series SK 500P
10 BU 0630 en-2020
The electrical installation must be implemented according to the applicable regulations (e.g. cable
cross-section, fuses, earth lead connections). Further instructions can be found in the documentation
or manual for the device.
Information regarding EMC-compliant installation such as shielding, earthing, location of filters and
routing of cables can be found in the documentation for the devices and in the technical information
manual TI 80-0011. This information must always be observed even with inverters with a CE label.
Compliance with the limit values specified in the EMC regulations is the responsibility of the
manufacturer of the system or machine.
In case of a fault, inadequate earthing may result in electric shock, possibly with fatal consequences.
The device may only be operated with effective earth connections which comply with local regulations
for large leakage currents (> 3.5 mA). Detailed information regarding connections and operating
conditions can be obtained from the technical Information manual TI 80-0019.
Connection of the supply voltage may directly or indirectly set the inverter into operation. Contact with
electrically live components will result in electric shock, possibly with fatal consequences.
All poles of cable connections (e.g. power supply) must always be disconnected.
Pos: 33 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s- u n d Ins t all a tio ns hi nw ei se - Einz el p unk te/ 4_ e. Be tr ie b ( Sic h er hei ts hinw eise (Umrichter))@ 19\mod_1508746864938_388.docx@ 2368741@ @ 1
Operation
Where necessary, systems in which the devices are installed must be equipped with additional
monitoring and protective equipment according to the applicable safety requirements (e.g. legislation
concerning technical equipment, accident prevention regulations, etc.).
All covers must be kept closed during operation.
With certain setting conditions, the device or the motor which is connected to it may start automatically
when the mains are switched on. The machinery which it drives (press / chain hoist / roller / fan etc.)
may then make an unexpected movement. This may cause various injuries, including to third parties.
Before switching on the mains, secure the danger area by warning and removing all persons from the
danger area.
Due to its operation, the device produces noises within the audible frequency range. These noises
may cause long-term stress, discomfort and fatigue, with negative effects on concentration. The
frequency range or the noise can be shifted to a less disturbing or almost inaudible range by
adjustment of the pulse frequency. However, this may possibly result in derating (lower power) of the
device.
Pos: 34 /A nl eitu ng e n/ Elek tro ni k/ Sa fe ty / 2. Si c her hei t /Si c h erh ei ts hi nw ei se [ Sa fet y ] - StörungdurchHandfunkgeräte@ 39\mod_1571297002057_388.docx@ 2565250@ @ 1
The PDS (SR) may suffer interference if mobile radio devices are used within a distance of less than
20 cm from the PDS (SR).
Pos: 35 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s- u n d Ins t all a tio ns hi nw ei se - Einz el p unk te/ 4_f . War tu ng, I ns ta nd hal tu ng un d A uß er be tri ebn ahm e ( Si ch erh eits hi nw ei s e) @ 19\m od_1508748695495_388.docx@ 2368881@ @ 1
Maintenance, repair and decommissioning
Installation, maintenance and repair work must not be carried out unless the device has been
disconnected from the voltage and at least 5 minutes have elapsed since the mains was switched off!
(Due to charged capacitors, the equipment may continue to carry hazardous voltages for up to
5 minutes after being switched off at the mains). Before starting work it is essential to check by
measurement that all contacts of the power plug connections or the connection are voltage-free.
For further information, please refer to the manual for the device.
Pos: 37 /A nl eitu ng e n/ Elek tro ni k/F U und S tar t er/ 1. Allg em ei n es/ Si ch er h eits - u nd Instal lati onshi nweis e und War n- Gef ahr en hinw eis e/ ne u/ Si c her heit s- u nd I ns t all a tio ns hi nw ei se - E i nz elp unk te /5 . Expl osi ons g ef ähr de te U mg ebu ng ( AT EX) [ S K x xx E-FD S, SK 5xxE] @ 1 2\mod_1466688226647_388.docx @ 332517 @ @ 1
4. Potentially explosive environment (ATEX)
The device is not approved for operation or maintenance work in potentially explosive environments
(ATEX).
Pos: 39 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ F unk tio ns bes chr eib ung _0 1 [Ü b ersc hr if t] @ 15\mod_1484812699011_388.docx@ 2312909@ 1 @ 1

2 Function description
BU 0630 en-2020 11
2 Function description
Pos: 40 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ F unk tio ns bes chr eib ung _0 2 @ 15\mod_1484812747040_388.docx@ 2312945@ @1
To avoid danger to persons and to prevent damage to material, machines must be able to be switched
off safely. The frequency inverters stated in this document provide safe shut-down methods.
The following basic explanation of the function of a frequency inverter serves to provide better
understanding of the function of safe shut-down methods:
The mains voltages are rectified and the resulting DC links circuit voltage is reconverted to AC
according to the requirements of the operating status of the motor (frequency and voltage).
The semiconductor switches of the inverter (T1 to T6) are controlled by a highly complex pulse
pattern. This pulse pattern is generated by the micro-controller (µC) and amplified by the driver. The
drivers convert the logic signals on the control voltages of the semiconductor switch. The
semiconductor switches are switched via the control voltage and the pulse pattern is amplified and
applied to the motor terminals. Due to the low-pass effect of the motor, a three-phase pulse width
modulated sine wave voltage, a three-phase system, results from the pulsed voltage. The motor
generates a torque.
Pos: 44 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ F unk tio ns bes chr eib ung _0 3 [S K 5xxP] @ 44\mod_1594729359570_388.docx @ 2645399@ 2 @ 1
2.1 Design of the safe shut-down method
Structure of the Safe Pulse Block for SK 510P, SK 540P
1
Safety Digital Input
2
Micro-controller
3 Driver
4
Safe Pulse Block

Functional Safety – Supplementary manual for series SK 500P
12 BU 0630 en-2020
Structure of the Safe Pulse Block for SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
1 Safety Digital Input
2
Micro-controller
3
Driver
4 Safe Pulse Block
By the use and combination of the safe shut-down methods Safe Pulse Block and/or Safety Digital
Input, the safety-related stop functions STO and SS1, as well as a simple restart block, can be
implemented with various safety and performance levels.
Pos: 46 /Al lg em ein/ Allg em eing ül tig e M od ul e/---------Seite num br uc h k om pak t --------- @ 13 \mod_1476369695906_0.docx@ 2265495@ @ 1
Pos: 48 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ Sic h ere Absc hal tw eg e_ 01 [ SK 500 P] @ 40\mod_1574333326841_388.docx@ 2577707@ 2 @ 1
2.2 Safe shut-down methods
Two safe shut-down methods are available for SK 500P series frequency inverters:
1. SK 510P and SK 540P are equipped with a permanently installed safety module.
2. SK 530P and SK 550P can be equipped with optional control terminals. The plug-in modules
SK CU5-SSTO and SK CU5-MLT provide safe shut-down methods.
Both variants provide the following safe shut-down methods:
• Safe Pulse Block
• Safety Digital Input
With the aid of safe shut-down methods, the following safe stop functions can be implemented:
• STO (Safe Torque Off) safely switched off torque
• SS1-t (Safe Stop 1 time controlled)
Pos: 53 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ Sic h ere Puls sp err e _01 [ SK 500 P] @ 44\mod_1594729516977_388.docx@ 2645437@ 3 @ 1
2.2.1 Safe Pulse Block
With the aid of an additional DC/DC converter, the Safe Pulse Block generates the supply voltage for
the drivers. For this, the Safe Pulse Block must be provided with a 24 V voltage or two 24 V voltages.
This must be provided as follows:
• SK 510P, SK 540P: 1 x 24 V via contact VIS_24V with reference potential VIS_0V
• SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT: 2 x 24 V via contacts VIS1_24V and
VIS2_24V with common reference potential VIS12_0V
Pos: 55 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ Sic h ere Puls sp err e _02 [ SK 500 P] @ 44\mod_1594729769814_388.docx@ 2645475@ @ 1
If this 24 V voltage is switched off, the DC/DC converter does not transmit any power to the drivers. As
the drivers are now no longer supplied with power, no pulses reach the semiconductor switches (T1 to
T6) of the inverter. The flow of current in the semiconductor switches and in the motor is interrupted.
I.e. after a certain response time of the electronics and the reduction of the motor current, the motor
does not develop a driving torque.
Switch-off of the 24 V voltages must be performed by a fail-safe switching device. This can be
implemented in various ways, depending on the safe shut-down method.

2 Function description
BU 0630 en-2020 13
SK 510P, SK 540P
For this, either the VIS_24V or VIS_0V contact may be disconnected from the 24 V voltage source.
Preferably, the VIS_24V contact is disconnected.
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
This variant has a dual-channel input circuit. Contacts VIS1_24V and VIS2_24V have a common
reference potential VIS12_0V. This reference potential must not be disconnected if a dual-channel
Safe Pulse Block is used. With this variant, the Safe Pulse Block can also be used with a single
channel. I.e. the two contacts VIS1_24V and VIS2_24V are connected in parallel.
In this case, both the 24 V voltage as well as the reference potential VIS12_0V can be disconnected.
Preferably, the parallel contacts VIS1_24V and VIS2_24V are separated.
Pos: 56 /A nl eitu ng e n/ Elek tro ni k/ Sa fe ty / 3. F unk ti ons b es c hrei bung /S af et y Digitaleingang[SK 500P]@ 40\mod_1574336094503_388.docx@ 2578102 @ 3@ 1
2.2.2 Safety Digital Input
The Safety Digital Input is explicitly intended for implementing a safety function. This means that the
standard digital inputs must not be used to implement a safety function.
With the Safety Digital Input, safe triggering is carried out using the micro-controller. This interrupts the
control signal to the drivers or provides a pulse pattern which shuts down the connected motor.
The Safety Digital Input can be parameterised with the following functions:
• Disable Voltage
The micro-controller interrupts the control signals to the drivers. No control pulses are provided to the
semiconductor switches (T1 to T6) of the inverter. I.e. the current in the semiconductor switches and in
the motor is interrupted and the motor runs down to a standstill.
• Quick Stop
The micro-controller shuts down the motor with control pulses according to a pre-set quick stop time.
With regard to function, the Safety Digital Input is identical for the two variants of the safe shut-down
method. However, there are differences with regard to the reference potential.

Functional Safety – Supplementary manual for series SK 500P
14 BU 0630 en-2020
SK 510P, SK 540P
In this case the Safety Digital Input with contact VISD_24V has the reference potential GND. This is
the same reference potential as for all other analogue and digital inputs and outputs of the frequency
inverter. For this reason, the Safety Digital Input cannot be triggered by disconnecting the reference
potential.
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
The Safety Digital Input of the CU5 modules has a separate reference potential VISD_0V. I.e. in this
case this reference potential can be disconnected to trigger the Safety Digital Input. Preferably, the
VISD_24V contact is disconnected
Pos: 63 /Al lg em ein /All gem ei ng ülti ge M od ul e/---------Seite num br uc h k om pak t --------- @ 13 \mod_1476369695906_0.docx@ 2265495@ @ 1
Pos: 64 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ Sic h erh ei tsf u nkti on e n @ 1 5\mod_1485168492973_388.docx @ 2314154@ 2 @ 1
2.3 Safety functions
Pos: 65 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ WAR NU N G - Ver s ag en einer Brem s e @ 3 9\mod_1570798924238_388.docx@ 2563904@ @ 1
WARNING
Mechanical brake failure
Control of a mechanical brake by means of the frequency inverter is not fail-safe. Triggering of the
STO and the fault response function causes the application of a mechanical brake which is controlled
by the frequency inverter. The brake takes the entire load of the drive units and all of its rotating
masses and attempts to stop it.
A brake which is not designed to take the full load (e.g. a holding brake) may be damaged and may
fail. This can cause severe or fatal injuries or damage to the equipment, e.g. due to falling loads.
• Design the brake as an operating brake
• Ensure that the drive unit is stopped before the STO function is activated.
Pos: 68 /A nl eitu ng e n/ Elek tro ni k/ Sa fe ty / 3. F u nkt i ons bes c hrei bu ng /Si c her hei tsf u nkti one n_ Sic her abg esc hal t et es M om en t, ST O @ 15\mod_1485168854901_388.docx@ 2314190@ 3 @ 1
2.3.1 Safe Torque Off, STO
The STO function prevents the supply of motive power to the motor. According to ISO 1411, this
function can be used to prevent unexpected starting and/or switch off the driving torque as quickly as
possible (see technical data response time) and allow the drive run down to a standstill (motor with
work machine).
This behaviour corresponds to stop category 0 (uncontrolled stopping) according to EN 60204-1.
Depending on the application the movement while running down to a standstill can cause a hazard for
an undefined time. Detection of whether or when the drive unit has achieved a safe state is not
integrated into the frequency inverter.
Depending on the switching equipment and use of a safe shut-down method, an STO function with
safety category 4 as per DIN EN ISO 13849-1 can be implemented.
Pos: 69 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ Sic h erh ei tsf u nkti on e n_Si ch er abg esc halt et es M om en t Erg ä nz ung , ST O [SK 50 0P ] @ 44\mod_1593153101665_388.docx @ 2638250@ @ 1
Bei einer Synchronmaschine kann es beim Versagen des Leistungsteils des Frequenzumrichters trotz
aktivierter STO-Funktion zu einer Ausrichtbewegung um eine Polteilung kommen.
Das verknüpfte Bild kann nicht angezeigt werden. Möglicherweise wurde die Datei verschoben, umbenannt oder gelöscht. Stellen Sie sicher, dass die Verknüpfung auf die korrekte Datei und den korrekten Speicherort zeigt.

2 Function description
BU 0630 en-2020 15
Pos: 72 /A nl eitu ng e n/ Elek tro ni k/ Sa fe ty / 3. F unk ti ons b es c hrei bung /S ic h er h eits f unk ti on e n_ Sic h erer St opp mit Z ei tst e uer ung, SS1-t [SK 500P]@ 40\mod_1574336646834_388.docx@ 2578141@ 3 @ 1
2.3.2 Safe stop 1 with time control, SS1-t
SK 500P series frequency inverters support implementation of the SS1 function in the variant SS1-t
(safe stop 1 with time control).
To stop the motor, the frequency inverter triggers a quick stop. After a time which is specific to the
application the STO function can be switched on. This behaviour corresponds to stop category 1
(controlled stopping) according to IEC 60204-1. The changeover to the STO function is time-controlled
via an external, fail-safe time relay (delayed output of an external safety device).
Information
Controlled stopping
Controlled stopping is triggered via the Safety Digital Input and meets lower safety requirements than
the STO function, which is triggered via the Safe Pulse Block.
Controlled stopping with SS1-t can fail without detection and must not be used if this failure can cause
a hazardous situation in the application.
Pos: 73 /A nl eitu ng e n/ Elek t ro ni k/ Sa fe ty/ 3. F u nk ti ons b es c hrei bung /Pr i or i tä te n un d F ehl er re ak ti o n [ S K 5 0 0P] @ 44\mod_1594730066229_388.docx@ 2645512@ 3 @ 1
2.3.3 Priorities and response to faults
As the Safe Pulse Block is based on switching off the supply voltage to the drivers of the inverter’s
semiconductor switches (T1 to T6), this shut-down method has the highest priority. I.e. if the safety
function STO is implemented with the Safe Pulse Block, the safety function STO also has the highest
priority. If the safety functions STO and SS1-t are implemented in parallel, it must be noted that
controlled stopping of the motor via the Safety Digital Input is interrupted by triggering the Safe Pulse
Block.
The Safety Digital Input has an internal fault diagnosis. If this diagnosis detects a fault, the control
signals to the drivers of the semiconductor switches (T1 to T6) of the inverter are switched off. This
fault response corresponds to the behaviour of the safety function STO with the special feature that
this fault state can only be acknowledged by resetting the mains voltage of the frequency inverter.
Acknowledgement via a bus system or the digital inputs is not possible.
NOTE: The SS1-t function must not be used if a hazardous situation can result in the application due
to the fault response.
Pos: 76 /Al lg em ein/ Allg em eing ül tig e M od ul e/---------Seite num br uc h k om pak t --------- @ 13 \mod_1476369695906_0.docx@ 2265495@ @ 1
Pos: 78 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ Bei s piel e / R e ali sier ung/ Bei s pi ele / R eali si eru ng [ SK 5 00P] @ 4 0\mod_1580802975694_388.docx@ 2588400@ 2@ 1
2.4 Examples / Implementation
The following shows some examples of solutions for the safety functions STO and SS1-t.
Pos: 79 /A nl eit ung en/ El ekt ro nik/ Sa fet y/ 3. F unk ti ons bes chr ei bung /B eis pi el e / R eal isi er ung/F u nkti on STO_ 0 1 @ 1 5\mod_1485263814224_388.docx@ 2314825@ 3 @ 1
2.4.1 STO function
Implementation of a safety function usually requires the use of a protective switching device. The
category of the function is determined by the component with the lowest category.
Pos: 83 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ Bei s piel e / R e ali sier ung/ F unk ti on ST O _0 2 [ SK 5xxP ] @ 4 4\m od_1594730243433_388.docx@ 2645550@ @ 1

Functional Safety – Supplementary manual for series SK 500P
16 BU 0630 en-2020
SK 510P, SK 540P
1
Supply voltage
2
Reset circuit
3
Input circuit with cross-circuit detection
4
Safety output
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
1
Supply voltage
2
Reset circuit
3
Input circuit with cross-circuit detection
4
2 x safety output with a common reference (GND)

2 Function description
BU 0630 en-2020 17
If the Safe Pulse Block is triggered for an enabled frequency inverter, this results in the error E018
(18.0 “Safety circuit”). To prevent this, the Safety Digital Input can additionally be used with the
Voltage Disable function (P424 = 1).
The typical response time can be reduced by additional use of the Safety Digital Input. A second
safety output is required to control this.
This solution is preferable, especially in cases where the switching device only checks its safety
outputs in the course of an enabling cycle, as is the case with some electro-mechanical switching
devices. A suitable inspection interval must be specified according to the safety requirements.
SK 510P, SK 540P
1
Supply voltage
2
Reset circuit
3
Input circuit with cross-circuit detection
4
Safety output
5
Safety output

Functional Safety – Supplementary manual for series SK 500P
18 BU 0630 en-2020
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
1
Supply voltage
2
Reset circuit
3
Input circuit with cross-circuit detection
4
Safety output
5
2 x safety output with a common reference (GND)
A separate shielded cable must be used to connect each of the safety outputs. However, with the use
of a protective switching device with cross-circuit monitoring of OSSD outputs, the cables of both
safety outputs can also be run in a common shielded cable.
The requirements for category 4 and PL e are only fulfilled by the Safe Pulse Block. The Safety Digital
Input only achieves category 2 and PL d (Performance Level d).
During the period between activation of the safety function via the Safety Digital Input and activation of
the STO via the Safe Pulse Block, the frequency inverter can also only fulfil category 2 and PL d.
Pos: 94 /Al lg em ein/ Allg em eing ül tig e M od ul e/---------Seite num br uc h k om pak t --------- @ 13 \mod_1476369695906_0.docx@ 2265495@ @ 1

2 Function description
BU 0630 en-2020 19
Pos: 96 /A nl ei tu nge n/ Elek tr o nik/ Sa fe ty/ 3. F u nkti ons b esc hr ei bu ng/ Bei s piel e / R e ali sier ung/ F unk ti on S S1-t [ SK 500P] @ 44\mod_1594209009459_388.docx @ 2643823@ 3@ 1
2.4.2 SS1-t function
The Safety Digital Input with the Quick Stop function (P424 = 2) is always required to implement the
function SS1-t.
SK 510P, SK 540P
1
Supply voltage
2
Reset circuit
3
Input circuit with cross-circuit detection
4
Safety output
5
Safety output, delayed by a safety timing element

Functional Safety – Supplementary manual for series SK 500P
20 BU 0630 en-2020
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
1
Supply voltage
2
Reset circuit
3
Input circuit with cross-circuit detection
4
Safety output
5
2 x safety output with a common reference (GND), delayed by a safety timing element
Actuation of the emergency stop button (call-up of the safety function) initially triggers a controlled
stopping action via the Safety Digital Input. In this case, it must be ensured that the drive is brought to
standstill within the parameterised “Quick stop time” (P426). After the elapse of a delay time which is
controlled by the protective switching device, the STO function is triggered via the Safe Pulse Block.
The delay time must be dimensioned so that the delay is longer than the quick stop time plus the “DC
Run-on time” (P559). The delay time must be selected so as to be fail-safe.
After the delay time which is set in the protective switching device has elapsed, the frequency inverter
always switches to the STO function. This also applies in the case of failure of the controlled stopping
action.
SK 500P series frequency inverters are equipped with additional control which is set via the “Safety
SS1 max. time” parameter (P423). If the motor is not stopped within the “Safety SS1 max time”
(P423), the frequency inverter performs the fault response action and generates an error message.
I.e. in this case the motor also runs down to a standstill.
A separate shielded cable must be used to connect each of the safety outputs. If a protective
switching device with cross-circuit monitoring of OSSD outputs is used, the cables of both safety
outputs can also be run in a common shielded cable.
The requirements for category 4 and PL e are only fulfilled by the Safe Pulse Block. The Safety Digital
Input only achieves category 2 and PL d (Performance Level d).
During the period between activation of the SS1-t safety function via the Safety Digital Input and
activation of the STO function via the Safe Pulse Block, the frequency inverter can also only fulfil the
requirements of category 2 and PL d.
Pos: 103 /Al lg em ein/ All gem eing ült ig e M od ule /---------Seiten um br uc h k om pak t --------- @ 13\mod_1476369695906_0.docx@ 2265495@ @ 1