Burkert Type 8681 - Manual (Page 50)

50
DeviceNet - Design
design aid 12.6.
power consumption of the electronics:
P
El
= 1.44 W or I
El
= 60 mA at 24 V
power consumption of a valve during activation (200 ms):
P
Valve-ON
= 1.0 W or I
Valve-ON
= 42 mA at 24 V
power consumption of a valve after reduction:
P
Valve
= 0.8 W or I
Valve
= 34 mA at 24 V
power consumption of an optical position report:
P
LED
= 1.0 W or I
LED
= 42 mA at 24 V
Calculation examples:
example 1:
3 valves are activated simultaneously, one position is reported (state for 200 ms):
P
Total
= P
El
+ 3 x P
Valve-ON
+ 1 x P
LED
5.44 W = 1.44 W + 3 x 1.0 W + 1 x 1.0 W
or
I
Total
= I
El
+ 3 x I
Valve-ON
+ 1 x I
LED
228 mA = 60 mA + 3 x 42 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
4.84 W = 1.44 W + 3 x 0.8 W + 1 x 1.0 W
or
I
Total
= I
El
+ 3 x I
Valve
+ 1 x I
LED
204 mA = 60 mA + 3 x 34 mA + 1 x 42 mA
When using an external initiator, its power requirement should be added.
english
Control Head Type 8681