Design Aid - Burkert 8681 Operating Instructions Manual

Feedback signal output:
Input / proximity switches (external initiator: S4 in):
Power supply:
Design:
Input current 1-signal:
Inputs valve actuation (Y1 - Y3):
Signal level - active:
Signal level - inactive:
Impedance:
13.3.

Design aid

Power consumption of the electronics:
P =
El
Power consumption of a valve during activation (200 ms):
P =
Valve-ON
Power consumption of a valve after reduction:
P =
Valve
Power consumption of an optical position report:
P =
LED
Also, if several control head valves were to be opened simultaneously, the switch signal will be sent stag-
gered to the valves. Only one valve 1.7 VA will ever be recorded.
Calculation examples:
Example 1:
3 valves are activated simultaneously, one position is reported (state for 200 ms):
P =
Total
7.3 VA =
or
I =
Total
61 mA =
66
S4 out is directly connected to S4in
voltage present at control head U
DC 2 and 3-wire,
Normally open contact, L-switching
I < 2 mA
Sensor
U > 60 V AC
U < 20 V AC
> 40 kOhm
1.2 VA
1.7 VA
1.4 VA
1.6 VA
P + 1 x P
El Valve-ON
1.2 VA + 1 x 1.7 VA
I + 1 x I
El Valve-ON
10 mA + 1 x 14 mA
English
Nominal
or I =
El
or I =
Valve-ON
or I =
Valve
or I =
LED
+ 2 x P + 1 x P
Valve
+ 2 x 1.4 VA + 1 x 1.6 VA
+ 2 x I + 1 x I
Valve
+ 2 x 12 mA + 1 x 13 mA
Control Head Type 8681
120VAC-Design
= 120 V AC, 50/60 Hz
10 mA at 120 VA
14 mA at 120 VA
12 mA at 120 VA
13 mA at 120 VA
LED
LED