6420 - 2 Pages

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6420

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www.nokeval.com sales@nokeval.com Frequency conversion in the range 0.0003 Hz..20 kHz Sensors NPN, PNP, Namur, pickup or contact Alarm level or pulse divider/ multiplier Output 0..20 mA, 4..20 mA, 0..5 V or 0..10 V Output linearisation Adjustable digital input filter Pulse counter with analog output (optional) Configuration by PC software or hand held programmer Power supply 24 VDC The pulse converter 6420 is designed for pulse sensors whose input frequency needs to be converted into analog output 0/4..20 mA or 0..5/10 V. The converter has an exceptionally wide frequency range 0.0003 Hz..20 kHz, so that it is ideally suited to e.g. flow sensors providing very low pulse frequencies. Configuration is easy by PC-based MekuWin software or the hand-held programmer 6790 Besides the current output the converter features one alarm level and a digital output. Making use of the alarm level the converter may function as a batch controller as well. Alternatively, the digital output may function as an internal configurable pulse divider/ multiplier that transmits impulses to an external counter, e.g. 1 pulse/ litre. The converter can also be used as a pulse counter that increases the output signal according to the scaling. The counter is reset via an external contact. The processor-based converter is easy to program by the general-purpose MekuWin PC-software or with the handheld programmer 6790. Schematic drawing Power supply 24 VDC Frequency counter Sensors: NPN PNP Namur Contact Push-pull Pick-up Pulse divider or multiplier NPN Cumulative pulse counter Counter reset Alarm or pulse output NPN- tai PNPtransistor (max. 100 mA) Cumulative counter Pulse/ mA (V), e.g. 0-2000

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Technical specification: Counter function: Sensors: Namur, NPN and Contact: Alarms: Hysteresis Digital output input current range <1and >2,7 mA open input voltage 9,7 V input resistance 1.2 kΩ shortage input current 8 mA input resistance 5 kΩ trigger level 2.5V (common) signal level 20...500 mV input resistance >1 MΩ counting of incoming pulses; the counter value increases the output (mA/V); reset via external push button. Counter function is alternative to the frequency input. 1 alarm level freely adjustable freely selectable PNP- or NPN-transistor, max. 28 V, 100 mA NPN, PNP, Namur,...

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