Burkert 8681 - Design Aid

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