Burkert 8681, Operating Instructions Manual, Page: 58 / 166

58
AS Interface - Design
Calculation examples:
Example 1:
3 valves are activated “simultaneously”, one position is reported (status for 200 ms):
P
Slave
= P
El
+ 1 x P
Valve-ON
+ 2 x P
Valve
+ 1 x P
LED
4.1 W = 1.0 W + 1 x 0.9 W + 2 x 0.6 W + 1 x 1.0 W
or
I
Slave
= I
El
+ 1 x I
Valve-ON
+ 2 x I
Valve
+ 1 x I
LED
136 mA = 33 mA + 1 x 30 mA + 2 x 20 mA + 1 x 33 mA
Example 2:
3 valves have been activated “simultaneously”, one position is reported (persistent state):
P
Slave
= P
El
+ 3 x P
Valve
+ 1 x P
LED
3.8 W = 1.0 W + 3 x 0.6 W + 1 x 1.0 W
or
I
Slave
= I
El
+ 3 x I
Valve
+ 1 x I
LED
126 mA = 33 mA + 3 x 20 mA + 1 x 33 mA
When using an external initiator, its power requirement should be added.
12.7 Safety instructions
DANGER!
Danger of explosion in a potentially explosive atmosphere (only in the event of a fault as zone 2)!
`
Opening the hood or the housing in a potentially explosive atmosphere is only allowed in a not ener-
gised state!
WARNING!
Risk of injury due to electric shock!
`
Before reaching into the system (except for the Teach procedure in a non-explosive atmosphere) switch
off the power supply and secure it to prevent restarting!
`
Observe applicable accident prevention and safety regulations for electrical equipment!
Risk of injury from improper installation!
` Installation may be carried out by trained technicians only and with the appropriate tools!
Risk of injury from unintentional activation of the system and uncontrolled restart!
`
Secure system against unintentional activation.
`
Following installation, ensure a controlled restart.
english
Control Head Type 8681