Votoc_3 User Manual
Contents
1. lt 2 N Hadzidakis T Katsabakou Co 1 Antikythiron St Gerakas 153 44 GREECE Tel 30 2106034002 Fax 30 2106034003 SYMMETRON http www symmetron gr ELECTRONIC APPLICATIONS 4 20mA VOLTAGE TO CURRENT CONVERTER VOTOCS3 INTRODUCTION 4 20mA current loop converter transmitter Used to transmit measurements to long distances with just two wires and without accuracy loss SENSOR INPUT Two options of input range by request 0 4 5VDC Conversion factor 0 28125 Volt MA On 2VDC Conversion factor 0 125 Volt MA Conversion accuracy V I 40 15 Input impedance 5MQ SENSOR SUPPLY V OUT Used for wind vane or other sensor excitation Two options of output voltage 4 5VDC Maximum output current 1 25 mA Accuracy 40 15 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 15VDC maximum 30VDC e PROTECTION From voltage surges and reverse connections e ENCLOSURE Sealed IP65 with cable glands 80x82x55 mm WEIGHT 160gr CONNECTION spring loaded terminals OPERATION TEMPERATURE 30 70T WARRANTY 1 year SYMMETRON VOTOC3 1 CONNEC TIONS Example 1 Connection to wind vane Voltage drop in cable 820 km x 2 x 1km x 20MA 3 28V Voltage drop in measurement resistor 25092 x 20mMA 5V Minimum vol2. tage drop required on VOTOC3 terminals 15V gt Minimum power supply voltage 3 28 5 15 23 28V SYMMETRON 2001 VOTOC V3 0 Vane Resistance 1km shielded cable 2 x 0 25 mm gt 5KO Shield connected to power supply terminal 0 0e00e00000 gp EN LOdd Measurement resistor 2500 C3 i O en D1 4 20mA LOOP he R4 e e te Uiz z2 S aae Power supply 24VDC 20 30VDC Ensure that loop sensor is lit Example 2 Connection to temperature sensor 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 VOTOC3 terminals 15V gt gt Minimum power supply voltage 8 5 15 28V 5km shielded cable 2 x 0 5 mm Shield connected to power supply terminal sensor Measurement resistor 2500 e 0e0e0000 gp EN Power supply 28VDC 20 30VDC Ensure that loop sensor is lit SYMMETRON VOTOC3 2
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