Witoc100_A User Manual
Contents
1. Power supply e l R6 24VDC ik S 12 30VDC zo Sy o lo m om ns ec9 TYPE i o e o o 5 sli e D3 INPUT PULS el e 5 Switch o _ o oo oL_ e Reed Ensure that red LED is lit and green KEET pee ee ee TA OPUEDUSE Filter switch in OFF position SYMMETRON WITOC100 22. 55 mm WEIGHT 200gr CONNECTION spring loaded terminals OPERATION TEMPERATURE 30 70T WARRANTY 1 year CONNEC TIONS Example 1 Connection to AC anemometer Voltage drop in cable 820 km x 2 x 1km x 20MA 3 28V Voltage drop in measurement resistor 25092 x 20mMA 5V gt Minimum voltage drop required on WITOC terminals 10V gt Minimum power supply voltage 3 28 5 10 18 28V Measurement resistor 2500 1km shielded cable 2 x 0 25 mm Shield connected to power supply terminal OFF J30 4 20mA LOOP ewe LOOP il R4 s J J e le x al te A Power supply 9 20VDC o i 12 30VDC a gt l 1 ES z gt al ls pz c9 pi E m e ej e o lo e e J J D3 INPUT PULSE e R10 pa e e _ e e e e 6020 MD Ensure that red LED is lit and green a eee In a rae LED flashes with input pulse iter Switch in UN position Example 2 Connection to Reed type anemometer Voltage drop in cable 400 km x 2 x 5km x 20mMA 8V Voltage drop in measurement resistor 25092 x 20mMA 5V gt Minimum voltage drop required on WITOC terminals 10V gt gt Minimum power supply voltage 8 5 10 23V Measurement resistor 250Q 5km shielded cable 2 x 0 5 mm Shield connected to power supply terminal J320 4 4 20mA_LOOP_ LOOP ans R49 Noa gt i 3 eE T a c FILTER p e a e
3. i lt P Hadjidakis N Katsampakou T CO Antikythiron 1 Gerakas 153 44 Greece Tel 30 2106034002 Fax 30 2106034003 SYMMETRON http www symmetron ar ELECTRONIC APPLICATIONS 4 20mA FREQUENCY TO CURRENT CONVERTER WITOC100 INTRODUCTION 4 20mA current loop converter transmitter Used to transmit measurements to long distances with just two wires and without accuracy loss SENSOR INPUT A green LED toggles On Off to indicate anemometer operation Input range 0 100Hz Conversion factor F I 6 25 Hz mA Accuracy 0 5Hz Input impedance 1MQ Sensitivity 100MV RMS SIN position 2V peak peak TTL position SENSOR SUPPLY 5V Used for anemometer or other sensor excitation Output voltage 5VDC Maximum output current 0 5 mA Accuracy 1 CURRENT LOOP OUTPUT The power supply and the instrument s output are both carried on two wires A red LED indicator is lit when the loop supply is present Power Supply Voltage difference from 24V terminal to RETURN terminal minimum 10VDC maximum 30VDC SWITCHES FILTER ON OFF switch activates a low pass input filter about 50Hz It is used when excessive noise is present and the output signal is unstable SIN TTL switch selects type of signal low level AC SIN suitable for MAX 40 type anemometers or unipolar 0 5V TTL for REED based sensors e PROTECTION From voltage surges and reverse connections e ENCLOSURE Sealed IP65 with cable glands 80x160x
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