Supply 3-Wire-System; Wiring Diagrams - BD ASM 400 Operating Manual

With Ex-protection the max. supply for a combination of transmitter and ASM 400 is 28 V
Insure that no external power can flow into the contacts.

3.6 Supply 3-wire-system

minimum supply:
The minimum supply of the ASM 400 (V
ASM 400, so the minimum supply of the transmitter must be used for the total appliance if it is
higher than 8 V. The following formulas are valid:
8
V ≥ V
if :
MU min
< 8
V V
if :
MU min
V = Minimum supply of the used 3-wire transmitter
MU min
maximum supply:
The maximum supply of the ASM 400 (V
plied by the ASM 400, the maximum supply does not only depend on the supply of the ASM
400. If the maximum supply of the transmitter is lower than 36 V, the maximum supply of the
total appliance may not exceed the transmitter's value. The following formulas are valid:
V ≥ 36 V
if :
MU max
36
V < V
if :
MU max
V = Maximum supply of the used 3-wire transmitter
MU max

3.7 Wiring diagrams

For the usage with BD SENSORS pressure transmitters, the following wiring diagrams are
given: For electrical connection a sheathed and twisted multicore cable is recommended.
2-wire-system (current)
+V
S
ASM 400
−V
S
3-wire-system (voltage)
+V
S
U U
ASM 400
Signal Signal
out in
−V
S
7
) is 8 V. The connected transmitter is supplied by the
S min
V = V
S min MU min
8
V = V
S min
S max
V = 36 V
S max
=
V V
S max MU max
Supply +
R
L
Contact 1
R
Contact 2
Supply -
Supply +
Contact 1
Contact 2
Supply −
U
Signal
) is 36 V. As the connected transmitter is also sup-
L
V
S
R
L
V
R
S
L
www.bdsensors.de
ASM 400
.
DC