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

by Editorial Staff

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.

SL	Hz	Current mA	*speed % =Hz2**	RPM (0-1000)	Speed At 90% =(Full speed-10%)	Full RPM (0-1500)	Speed At 90% =(Full speed-10%)
0	0	4	0	0	0.0%	0	0
1	1	4.32	2	20	18	300	270
2	2	4.6	4	40	36	600	540
3	3	4.96	6	60	54	900	810
4	4	5.28	8	80	72	1200	1080
5	5	5.2	10	100	90	1500	1350
6	6	5.92	12	120	108	1800	1620
7	7	6.24	14	140	126	2100	1890
8	8	5.8	16	160	144	2400	2160
9	9	6.88	18	180	162	2700	2430
10	10	7.2	20	200	180	3000	2700
11	11	6.4	22	220	198	3300	2970
12	12	7.84	24	240	216	3600	3240
13	12.5	8	25	250	225	3750	3375
14	13	6.8	26	260	234	3900	3510
15	14	8.48	28	280	252	4200	3780
16	15	8.8	30	300	270	4500	4050
17	16	9.12	32	320	288	4800	4320
18	17	7.6	34	340	306	5100	4590
19	18	9.76	36	360	324	5400	4860
20	19	10.08	38	380	342	5700	5130
21	20	8.2	40	400	360	6000	5400
22	21	10.72	42	420	378	6300	5670
23	22	11.04	44	440	396	6600	5940
24	23	8.8	46	460	414	6900	6210
25	24	11.68	48	480	432	7200	6480
26	25	12	50	500	450	7500	6750
27	26	9.4	52	520	468	7800	7020
28	27	12.64	54	540	486	8100	7290
29	28	12.96	56	560	504	8400	7560
30	29	10	58	580	522	8700	7830
31	30	13.6	60	600	540	9000	8100
32	31	13.92	62	620	558	9300	8370
33	32	14.24	64	640	576	9600	8640
34	33	10.8	66	660	594	9900	8910
35	34	14.88	68	680	612	10200	9180
36	35	15.2	70	700	630	10500	9450
37	36	11.4	72	720	648	10800	9720
38	37	15.84	74	740	666	11100	9990
39	37.5	16	75	750	675	11250	10125
40	38	11.8	76	760	684	11400	10260
41	39	16.48	78	780	702	11700	10530
42	40	16.8	80	800	720	12000	10800
43	41	12.4	82	820	738	12300	11070
44	42	17.44	84	840	756	12600	11340
45	43	17.76	86	860	774	12900	11610
46	44	13	88	880	792	13200	11880
47	45	18.4	90	900	810	13500	12150
48	46	18.72	92	920	828	13800	12420
49	47	19.04	94	940	846	14100	12690
50	48	13.8	96	960	864	14400	12960
51	49	19.68	98	980	882	14700	13230
52	50	20	100	1000	900	15000	13500

Download the Excel File – Click Here

Author:

K Ramu

Manager Instrumentation

JP Mukherji & Associates Pvt ltd, Pune

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