4-20mA Linear Conversion Calculation for VFD Drive (Formula)

4-20mA Linear Conversation Calculation for VFD Drive and conversion Formula and with Example table.

4-20mA VFD Drive Formula

Speed % = [(X-4)/16]*100

X = Current Value in mA

The below table shows the different valves for the respective 4-20 mA current and motor speed.

SLHzCurrent mAspeed % =Hz*2RPM        (0-1000)Speed At 90% =(Full speed-10%)Full RPM        (0-1500)Speed At 90% =(Full speed-10%)
004000.0%00
114.3222018300270
224.644036600540
334.9666054900810
445.288807212001080
555.2101009015001350
665.921212010818001620
776.241414012621001890
885.81616014424002160
996.881818016227002430
10107.22020018030002700
11116.42222019833002970
12127.842424021636003240
1312.582525022537503375
14136.82626023439003510
15148.482828025242003780
16158.83030027045004050
17169.123232028848004320
18177.63434030651004590
19189.763636032454004860
201910.083838034257005130
21208.24040036060005400
222110.724242037863005670
232211.044444039666005940
24238.84646041469006210
252411.684848043272006480
2625125050045075006750
27269.45252046878007020
282712.645454048681007290
292812.965656050484007560
3029105858052287007830
313013.66060054090008100
323113.926262055893008370
333214.246464057696008640
343310.86666059499008910
353414.8868680612102009180
363515.270700630105009450
373611.472720648108009720
383715.8474740666111009990
3937.516757506751125010125
403811.8767606841140010260
413916.48787807021170010530
424016.8808007201200010800
434112.4828207381230011070
444217.44848407561260011340
454317.76868607741290011610
464413888807921320011880
474518.4909008101350012150
484618.72929208281380012420
494719.04949408461410012690
504813.8969608641440012960
514919.68989808821470013230
52502010010009001500013500

Download the Excel FileClick Here

Author:

K Ramu

Manager Instrumentation

JP Mukherji & Associates Pvt ltd, Pune

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