SIEMENS
7/114
Siemens D 21.4 · 2017
SINAMICS S120 drive system
Chassis format
7
Power unit protection
■
Technical specifications
The most important directives and standards are listed below. These are used as the basis for the SINAMICS S120 built-in units
in chassis format and they must be carefully observed to achieve an EMC-compliant configuration that is safe both functionally and
in operation.
Motor blocking protection
A blocked motor is detected and protected against thermal overloading by a fault trip.
Brake control
"Simple brake control" for control of holding brakes:
The holding brake is used to secure drives against unwanted motion when deactivated.
"Extended brake control" function module for complex brake control, e.g. for motor holding brakes and operational brakes:
When braking with a feedback signal, the brake control reacts to the feedback signal contacts of the brake.
Write protection
Write protection to prevent unintentional changing of the setting parameters (without password function).
Know-how protection
Know-how protection for encrypting stored data, e.g. to protect configuration know-how, and to protect against changes and
duplication (with password function).
Web server
The integrated web server provides information about the drive unit via its web pages. The web server is accessed using a
web browser via unsecured (http) or secured transfer protocol (https).
Software and protective
functions
Description
Power unit protection
Description
Ground fault monitoring
at the output
A ground fault at the output is detected by a total current monitor and results in shutdown in grounded systems.
Electronic short-circuit
protection at the output
A short-circuit at the output (e.g. at the converter output terminals, in the motor cable or in the motor terminal box) is detected
and the converter shuts down with a "fault".
Thermal overload
protection
An alarm is issued first when the overtemperature threshold responds. If the temperature continues to rise, the unit either shuts
down or independently adjusts the pulse frequency or output current so that thermal load is reduced. Once the cause of the
fault has been eliminated (e.g. cooling has been improved), the original operating values are automatically resumed.
European directives
2014/35/EU
Low Voltage Directive:
Directive of the European Parliament and
Council of February 26, 2014 for the harmo-
nization of the laws of the member states
relating to the provision of electrical equip-
ment designed for use within certain voltage
limits on the market (amended version)
2014/30/EU
EMC Directive:
Directive of the European Parliament and
Council of February 26, 2014 for the harmo-
nization of the laws of the member states
relating to electromagnetic compatibility
(amended version)
2006/42/EC
Machinery Directive:
Directive of the European Parliament and
Council of May 17, 2006, on machinery and
amending Directive 95/16/EC (amended
version).
European standards
EN ISO 3744
Acoustics – Determination of the sound
power level and sound energy level for noise
sources that result from sound pressure mea-
surements – envelope surface procedure of
the accuracy class 2 for a largely free sound
field over a reflecting plane
EN ISO 13849-1
Safety of machinery – safety-related parts of
control systems;
Part 1: General design guidelines
(ISO 13849-1: 2006) (replaces EN 954-1)
EN 60146-1-1
Semiconductor converters – General require-
ments and line-commutated converters
Part 1-1: Specification of basic requirements
EN 60204-1
Safety of machinery – Electrical equipment
of machines;
Part 1: General requirements
EN 60529
Degrees of protection provided by
enclosures (IP code)
EN 61508-1
Functional safety of electrical/electronic/
programmable electronic safety-related
systems
Part 1: General requirements
European standards
(continued)
EN 61800-2
Adjustable speed electrical power drive
systems
Part 2: General requirements – Rating
specifications for low voltage adjustable
frequency AC power drive systems
EN 61800-3
Adjustable speed electrical power drive
systems
Part 3: EMC requirements and specific test
methods
EN 61800-5-1
Adjustable speed electrical power drive
systems
Part 5: Safety requirements
Main section 1: Electrical and thermal
requirements
EN 61800-5-2
Adjustable speed electrical power drive
systems
Part 5-2: Safety requirements – Functional
safety (IEC 61800-5-2: 2007)
North American standards
UL 508A
Industrial Control Panels
UL 508C
Power Conversion Equipment
UL 61800-5-1
Adjustable Speed Electrical Power Drive
Systems – Part 5-1: Safety requirements –
Electrical, thermal and energy
CSA C22.2 No. 14
Industrial Control Equipment
Certificates of suitability
cULus, cURus
Testing by UL (Underwriters Laboratories,
www.ul.com
) according to UL and CSA
standards
■
Function
(continued)
© Siemens AG 2017