7
www.bdsensors.de
ASM 400
With Ex-protection the max. supply for a combination of transmitter and ASM 400 is 28 V
DC
.
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
S min
) is 8 V. The connected transmitter is supplied by the
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:
if
V
V
MU
8
min
≥
:
min
min
MU
S
V
V
=
if
V
V
MU
8
min
<
:
V
V
S
8
min
=
V
MU min
= Minimum supply of the used 3-wire transmitter
maximum supply:
The maximum supply of the ASM 400 (
V
S max
) is 36 V. As the connected transmitter is also sup-
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:
if
V
V
MU
36
max
≥
:
V
V
S
36
max
=
if
V
V
MU
36
max
<
:
max
max
MU
S
V
V
=
V
MU max
= Maximum supply of the used 3-wire transmitter
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)
3-wire-system (voltage)
T
ra
n
s
m
it
te
r
Supply -
+V
S
−
V
S
V
S
ASM 400
Contact 1
R
L
Contact 2
R
L
+V
S
T
ra
n
s
m
it
te
r
Supply
−
−
V
S
ASM 400
U
Signal
out
U
Signal
in
U
Signal
V
S
Contact 1
Contact 2
R
L
R
L
Summary of Contents for ASM 400
Page 18: ...ASM 400 Dimensions...
Page 19: ...19 www bdsensors de ASM 400...
