Safe speed monitors with SIL3/PLe and SIL2/PLd certification

Often there is a high risk to people and machinery in industrial applications. In these cases, it is necessary and required by law to fulfill certain safety criteria to reduce these risks. This is precisely where the application field of our speed monitors of the DS series is. They are used to monitor underfrequencies, overfrequencies, direction of rotation and machine standstill. With their SIL3/PLe and SIL2/PLd certifications according to the DIN 61508 and ISO 13849 standards, the safety relays ensure maximum safety and reliability.
 

Safety Speed Monitor for incremental encoders / sensors for monitoring of ramp, underspeed, overspeed, standstill an direction of rotation, with cable break monitoring of the sensor signals. Up to SIL3/PLe with one equally certified sensor.

 

  • Safety functions equivalent to EN 61800-5-2
    (SS1, SS2, SOS, SLS, SDl, SSM, SLI, SBC, STO, SMS)
  • 1 incremental encoder input with format A, /A, B, /B, Z, /Z
    [HTL differencial, HTL single ended, RS422]
  • 8 control inputs [HTL / PNP]
  • Input frequency up to 500 kHz
  • 2 relay outputs 5... 250 VAC / VDC (NO)
  • 4 x 2 control outputs with push-pull characteristic, short-circuit-proof,
    [HTL], antivalent or equivalent redundant or simply used
  • Safety related 14 bit analog output for 4 ... 20 mA (scalable)
Safety Speed Monitor for Incremental Encoders / Sensors

Performance as DS260, but up to SIL3/PLe with two independent, non-certified sensors and two incremental encoder Inputs.

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The plug-in display unit BG200 is used for the motrona safety devices of the DS series. This devices contains a huge variety of visualization applications. Thanks to its intuitive operation, it is fast, simple and flexible to use.

The BG200 offers the following features on the safety device:
 

  • Dual channel frequency indicator
  • Individual scalable for speed indicator, production rates, etc.
  • Visualization of operating and error mode
Plug-in Display Unit

The Safety Motion Monitors for SinCos sensors are suitable for safety-related monitor tasks, e.g. direction of rotation, standstill, overspeed and underspeed.

 

  • Safety functions equivalent to EN 61800-5-2
    (SS1, SS2, SOS, SLS, SDl, SSM, SLI, SBC, STO, SMS)
  • 1 encoder input with format SIN+, SIN-, COS+, COS- [1 Vss]
  • 2 control inputs [HTL / PNP]
  • Input frequency up to 500 kHz
  • Forced-guided redundant output relay (NO)
  • 4 control outputs with push-pull characteristic, short-circuit-proof, [HTL],
    each inverse and redundant
  • Safety related 14 bit analog output for 4 ... 20 mA (scalable)
Certified Safety Monitors with SinCos Encoder and Signal Splitter

Performance as DS240, but different input configuration.

 

  • Safety functions equivalent to EN 61800-5-2
    (SS1, SS2, SOS, SLS, SDl, SSM, SLI, SBC, STO, SMS)
  • 2 encoder inputs with format SIN+, SIN-, COS+, COS- [1 Vss]
  • 2 pulse inputs with format A, /A, B, /B [RS422]
  • 2 pulse- or control inputs with format A, B, 90° [HTL / PNP]
    (for rotary encoder, proximity switches or commands)
  • Input frequency up to 500 kHz
  • Forced-guided redundant output relay (NO)
  • 4 control outputs with push-pull characteristic, short-circuit-proof,
    [HTL], each inverse and redundant
  • Safety related 14 bit analog output for 4 ... 20 mA (scalable)
[Translate to Englisch:] SIL3 Drehrichtungswächter Drehzahlwächter Stillstandswächter

The plug-in display and programming unit BG230 is used for the motrona safety devices of the DS230 - DS246 series. This devices contains a huge variety of functions and options of applications. Thanks to its intuitive operation, it is fast, simple and flexible to use. Easy "copy & paste" of system parameters allows the quick transfer to other devices with the same or similar configuration.

 

The BG230 offers the following features on the safety device:

 

  • Dual channel frequency indicator
  • Individual scalable for speed indicator, production rates, etc.
  • Editing and saving of the BG230 scaling and safety devices parameters
  • Editing and copying of the safety devices parameters
  • Visual error messaging
[Translate to Englisch:] Aufsteckbares Anzeige- und Programmiermodul

SIL3/PLe & SIL2/PLd what is it?

The speed and standstill monitors of the DS-series are SIL3/PLe and SIL2/PLd certified.

SIL is the abbreviation for Safety Integrity Level. The term comes from the field of functional safety and is used in the international standard IEC 61508. The sector-specific standard for the realization of safety-relevant electrical control systems is defined in the IEC or EN 62061.

Classified into four different safety integrity level, the reliability of safety functions of electrical systems is described. The classification is from SIL1 to SIL4. SIL1 stands for the lowest reliability and SIL4 for the highest. Depending on the sensors used, the speed monitors of the DS series can achieve a SIL3 safety integrity level.

The abbreviation PL stands for Performance Level and is used, like the safety integrity level, for the classification into safety classes. The performance level falls under the standard ISO 13849. This classification takes place from PLa to PLe. PLa stands for the lowest risk reduction, PLe for the highest. DS-series safety relays are certified up to PLe.

The picture besides illustrates the risk analysis, which helps to calculate the required performance level. The first analysis step S determines the severity of the injuries that can happen in an accident. The analysis F deals with the frequency, which an error can occur or the duration of the user's stay under the risk. Finally, there is a decision about the possibility of avoiding the threat, or even limiting the damage. Consequently, high-risk applications require components with the highest performance level PLe, such as the DS-series speed monitors. But also for applications that require a "non-safe" speed monitoring, motrona has the appropriate speed monitors in the range.

The table in the picture compares the performance level to the corresponding safety integrity level. As a result, the combinations SIL3/PLe and SIL2/PLd can be derived.

Besides SIL and PL, there are a few other classification standards. For example, according to categories in the EN954-1 standard, or according to the Design Assurance Level (DAL) according to the DO-178B. (image source: Baumüller Nürnberg GmbH)