50
AS Interface - Design
NOTE!
If all 3 solenoid valves are simultaneously controlled via the AS interface, the electronics will activate
the valves sequentially with a 200 ms time delay to protect the bus from overloads.
Please follow the instructions on power requirement and maximum expansion stage of the AS interface
network in Chapter "11.3. Number of connectable control heads and maximum length of the bus line" and
in the AS interface specifications, where applicable.
External power supply:
External power supply
19.2 V DC to 31.6 V DC
The power supply unit must include a secure disconnection in
accordance with IEC 364-4-41. It must conform to the SELV standard.
The ground potential must not have a ground connection.
Max. power consumption from external
power supply for
outputs (solenoid valves) -
without integrated current limiting
≤
110 mA at 24 V DC
Max. power consumption from AS-i
for inputs and display
≤
150 mA type.
Integrated short-circuit protection
Please follow the instructions on power requirement and maximum expansion stage of the AS interface
network in Chapter "11.3. Number of connectable control heads and maximum length of the bus line" and
in the AS interface specifications, where applicable.
11.5. Design aid
Design aid for supply of the valves via the AS-i bus
Power consumption of the electronics:
P
El
= 1.0 W
or
I
El
= 33 mA at 30.5 V
Power consumption of a valve during activation (200 ms):
P
Valve-ON
= 0.9 W
or
I
Valve-ON
= 30 mA at 30.5 V
Power consumption of a valve after reduction:
P
Valve
= 0.6 W
or
I
Valve
= 20 mA at 30.5 V
Power consumption of an optical position report:
P
LED
= 1.0 W
or
I
LED
= 33 mA at 30.5 V
For the design of the
maximum line lengths
observe Chapter "11.3. Number of connectable control heads and
maximum length of the bus line".
Also, if several control head valves were to be opened simultaneously via the bus, the switch signal will be
sent staggered to the valves. Only
one
0.9 W valve will ever be recorded.
english