High Country Tek HFS-J-Bus - Manual (Page 23)

Electronic Controller Solutions for the Global Fluid Power Industry
Hydraulic Fan System Controller with SAE J1939 Interface
HFS-J User Guide
Part No:- 021-00158 Rev C HFS-J Hydraulic Fan System Controller User Guide Page | 23
Channel controlling fan speed:
Channel 1 % = 100 x = 80f – 50f = 30f
120f – 50f = 70f
= 0.4285 x 100 = 42.85%
Controlling channel = largest percentage value
In this example – Channel 2 would control fan speed
Channel 2 % = 100 x = 80f – 40f = 40f
110f – 40f = 70f
= 0.5714 x 100 = 57.14%
Channel 3 % = 100 x = 80f – 60f = 20f
130f – 60f = 70f
= 0.2857 x 100 = 28.57%
10F
20F
30F
40F
50F
60F
70F
90F
100F
110F
120F
130F
140F
Fan Max Temp
120F
Fan Start
Temp 50F
Channel 1
Channel 2
Fan Max Temp
110F
Fan Start
Temp 40F
Channel 3
Fan Start
Temp. 60F
Fan Max Temp
130F
80F= Current Temp.
80F
Controlling
Channel
= 100 x
Current Temp. – Fan Start temp.
Fan Max Temp. – Fan Start temp.