Burkert 8681, Operating Instructions Manual, Page: 91 / 166

91
büS/CAN open-Design
15.8 Design aid
Power consumption of the electronics:
P
El
= 1.3 W or I
El
= 54 mA at 24 V
Power consumption of a valve during activation (200 ms):
P
Valve-ON
= 0.9 W or I
Valve-ON
= 38 mA at 24 V
Power consumption of a valve after reduction:
P
Valve
= 0.6 W or I
Valve
= 25 mA at 24 V
Power consumption of an optical position feedback:
P
LED
= 0.7 W or I
LED
= 30 mA at 24 V
Calculation examples:
Example 1:
3 valves are activated, one position is reported (status for 200 ms): the control head switches automatically one
valve after another to keep the current consumption low - i.e.: max. current consumption I
Total l, max.
= current con -
sumption of 2 valves (already activated) + 1 valve (just switching)
P
Total
= P
El
+ 2 x P
Valve
+ 1 x P
Valve-ON
+ 1 x P
LED
4.1 W = 1.3 W + 2 x 0.6 W + 1 x 0.9 W + 1 x 0.7 W
or
I
Total
@ 24 V = I
El
+ 2 x I
Valve
+ 1 x I
Valve-ON
+ 1 x I
LED
172 mA = 54 mA + 2 x 25 mA + 1 x 38 mA + 1 x 30 mA
Example 2:
3 valves have been activated, one position is reported (persistent state):
P
Total
= P
El
+ 3 x P
Valve
+ 1 x P
LED
3.8 W = 1.3 W + 3 x 0.6 W + 1 x 0.7 W
or
I
Total
@ 24 V = I
El
+ 3 x I
Valve
+ 1 x I
LED
159 mA = 54 mA + 3 x 25 mA + 1 x 30 mA
When using an external initiator, its power requirement should be added.
english
Control Head Type 8681