Omega Engineering LVC521 User's Manual
Contents
1. state LED will not be lit The control remains de energized until the liquid level recedes below electrode on terminal L The control then energizes OPTIONAL Time Delays With time delay on increasing level the liquid must be in contact with the short electrode for the full duration of the time delay before control will operate With delay on decreasing level the liquid must be below long electrode for the full duration of the time delay before control will operate In single level service H and L terminals must be jumpered together to achieve time delays on both increasing and decreasing levels or just decreasing level Copyright 1990 OMEGA ENGINEERING INC All rights reserved including illustrations Nothing in this manual may be reproduced in any manner either wholly or in part for any purpose whatsoever without written permission from OMEGA ENGINEERING INC M1222 12902. CJz0MEGA ENGINEERING INC An OMEGA Technologies Company One Omega Drive Box 4047 Stamford Connecticut 06907 0047 203 359 1660 Telex 996404 Cable OMEGA FAX 203 359 7700 INSTALLATION OF LVC521 STANDARD RELAY ELECTRONICS This bulletin should be used by experienced per sonnel as a guide to the installation of LVC521 modules Selection or installation of equipment should always be accompanied by competent technical assistance We encourage you to contact OMEGA if further information is required SPECIFICATIONS CONTROL DESIGN Open Circuit Board Design CONTACT DESIGN SPDT 1 form C one normally open N O and one normally closed N C non powered contacts CONTACT RATINGS 10A 120 240 VAC resistive 1 3 H P 120 240 VAC CONTACT LIFE Mechanical 5 million operations Electrical 100 000 operations minimum at rated load SUPPLY VOLTAGE Standard 120 VAC optional 24 240 VAC models plus 10 minus 15 50 60 Hz SUPPLY CURRENT 120 240 24 VAC Relay energized 4 4 VA SECONDARY CIRCUIT 12 VAC RMS voltage on probes 1 5 milli amp current SENSITIVITY Models operate from 0 1 000 000 OHM maximum specific resistance TEMPERATURE 40 to 150 degrees F ambient TERMINALS Probe connections 3 16 spade line and power connections 1 4 spade TIME DELAYS Standard H probe 5 seconds on rising level LISTING ULL Contro 508 recognized Industrial Motor BACKPLATE SUPPLIEO BY OTHERS FOR TH
3. E PANEL MOUNT STANO OFF S TO BE DRILLED IN BACK PLATE SHOULO BE 187 DIA il i doo So FOR THE RETROFIT STAND OFF THAU HOLES TO BE DRILLED IN BACK PLATE SHOULD BE pei i 1 v DIMENSIONAL DIAGRAM INSTALLATION 1 Drill 3 three 187 dia holes in customer supplied backplate using stick on template supplied with control Standard standoffs are designed for backplate thickness of 062 1 16 Standoffs are available for backplate of 125 1 8 nominal thickness If retro fit plate standoffs are used drill 3 three 250 dia holes in proper location 2 Install 3 three standoffs into backplate Snap circuit board onto standoffs See sketch for proper installation Install control in appropriate enclosure 3 Wire control per wiring diagram following N E C and local codes Use appropriately sized spade terminals STAND OFF STYLE DIAGRAM CONTROL CIRCUIT BOARD JM RETRO FIT PLATE ce OR BACKPLATE A i BACKPLATE SUPPLIED BY CUSTOMER PANEL MOUNT STANDOFF RETROFIT STANDOFF SENSITIVITIES VS MAXIMUM PROBE WIRE DISTANCE SENSITIVITY KOHMS DISTANCE FT 4 7 10 000 10 5 700 26 2 200 50 1 075 100 570 470 270 1 000 38 Based on type MTW or THHN wire 14 or 16 Awg OPERATION OF LVC521 MODULES A C SUPPLY ul TRANSFORMER WIRING DIAGRAM NOTE LOAD CONTACTS ARE NON POWERED HiGH PROBE REFERENCE PROBE TANK IF METALLIC MAY B
4. E USED INSTEAD OF REFERENCE PROBE FOR SINGLE LEVEL SERVICE USE H AND G CONNECTIONS OPERATION Direct Mode Single Leve Service When the liquid rises to the electrode on terminal H the control energizes changing state of the load contacts LED will be lit The control remains energized unti the liquid level recedes below electrode on terminal H The control then de energizes LED will not be lit returning load contacts to original state Inverse Mode Single Level Service Control energizes with power changing the state of the load contacts LED will be lit When the liquid rises to the electrode on terminal H the control de energizes returning load contacts to shelf state LED will not be lit The control remains de energized until the liquid level recedes below electrode on terminal H The control then energizes Direct Mode Differential Service When the liquid rises to the electrode on terminal H the control energizes changing the state of the load contacts LED will be lit The control remains energized until the liquid level recedes below electrode on terminal L The control then de energizes LED will not be lit returning load contacts to original state Inverse Mode Differential Service Control energizes with power LED will be lit changing the state of the load contacts When the liquid rises to the electrode on terminal H the control de energizes returning load contacts to shelf
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