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Speed Monitoring Systems - Overspeed Protection
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Überwachungsysteme |
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Speed Monitoring Systems with Enhanced Safety,
for turbines, pumps, motors, as typically found in power plants.
A system intended to protect persons and assets against overspeed danger must be equipped accordingly (overspeed protection). This concerns its parts, but also the redundancy of its structure. We offer different gradations to regard the individual requirements of the application.
Safety Aspects
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Redundancy by the number of participating channels
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With one channel only, safety is determined by the equipment of this one element. Sensor monitoring, plausibility (function presence) check, and failure signal are indispensable hereto. With a 2-channel redundancy 2 such units operate in parallel. Their outputs are tied together, but this requires a pre-decision what to do in case of a discrepancy, whether trip or not. The 3-channel redundancy allows the majority to determine the action. This not only enhances safety in event of danger but also increases security against false alarm and thereby promotes machine availability. True functional tests are possible during operation. The E16 design may do this automatically, saving cost of maintenance.
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D521
E16
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| Intrinsic Self Tests |
A plausibility test reports any channel performance failure. The sensor monitoring facility detects a peripheral failure at an early stage. Regularly repeated response tests by an independent Test Generator, as possible with the E16 ensure the maximum in safety.
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Test Routine
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E16 performs these tests automatically and regularly under full load. The user is exempted from the otherwise obligatory manual tests. The test routine of E16x3 fulfils all requirements up to SIL3 of IEC 61508.
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| Failure Signal |
Indispensable for true safety, by calling for the necessary measures, in time
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| Certification compliant |
Series E16x3 for SIL3 according to IEC61508 (without restriction) and compliant with API 670.
Series E16x4 compliant with API 670.
Series D521 for SIL 2 according to IEC 61508
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click system No. for detailed information
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System
Characteristic
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E16 
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D521
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Redundancy
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3-channels, plug-in monitors, 2of3 voting incorporated
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1 channel per unit
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Intrinsic self tests
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plausibility check, channel comparison, test generator optional
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Plausibility, utilizing 1 setpoint
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Sensor monitor
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in each channel, for supply circuit and signal lead (with adequate sensors)
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supply, and signal lead of A5S..sensors
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Test Routine
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optionally integrated
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Setpoint alarms
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1 to trip 2v3voted, 1 extra per channel, up to 8 more as option
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2 with SPDT contacts, 2 optional electronic
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Failure announce
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incorporated
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utilizing 1 setpoint
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System test
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optionally incorporated, with manual or automatic test routine
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Analog outputs
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optional 1 up to 3 per channel
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one as standard
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Sensor inputs
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to hi-level A5S sensors, optionally to magnetic pick-ups
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input paths to standard and pickup sensors
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Pulse outputs
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24 V square wave, isolated
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10v with input, o/c following predivider
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Data interface
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RS232 = standard, PROFIBUS = option
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RS 232
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Further functions
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direction, ratio/difference, acceleration, as integrated options
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by separate units
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overspeed danger, overspeed protection, speed monitoring
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Ausdruck von Datenblättern bitte über die zugehörigen Downloads
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High Safety Speed Monitoring Systems
