Burkert 8681 - Design Aid

42
24VDC - Design
10.3 Design aid
Power consumption of the electronics:
P
El
=0.7W or I
El
=30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 report:
P
LED
=1.0W or I
LED
=42mA at 24 V
Also, if several control head valves were to be opened simultaneously, the switch signal will be sent
staggered to the valves. Only one 0.9 W valve will ever be recorded.
Calculation examples:
Example 1:
3valvesareactivatedsimultaneously,onepositionisreported(statusfor200ms):
P
Total
=
P
El
+ 1 x P
Valve-ON
+ 2 x P
Valve
+ 1 x P
LED
3.8W = 0.7 W + 1 x 0.9 W + 2 x 0.6 W + 1 x 1.0 W
or
I
Total
= I
El
+ 1 x I
Valve-ON
+ 2 x I
Valve
+ 1 x I
LED
160mA= 30 mA + 1 x 38 mA + 2 x 25 mA + 1 x 42 mA
Example 2:
3valveshavebeenactivatedsimultaneously,onepositionisreported(persistentstate):
P
Total
= P
El
+ 3 x P
Valve
+ 1 x P
LED
3.5W= 0.7 W + 3 x 0.6 W + 1 x 1.0 W
or
I
Total
= I
El
+ 3 x I
Valve
+ 1 x I
LED
147mA= 30 mA + 3 x 25 mA + 1 x 42 mA
Whenusinganexternalinitiator,itspowerrequirementshouldbeadded.
english
Control Head Type 8681