SenSmart 3000 User's Manual
Document: UM-1003
Revision Level B
35
S1
TB1
TP1
C1
C2
TB2
C7
S2
Ribbon to Display Assy.
C8
Q1
Assy 10-0233_18VAC
+
+
+
+
1
1
24VDC OUT is unregulated DC power
generated from 18VAC~ input power.
*Apply 18VAC between
18VAC Terms. on TB2.
4-20 OUT +SIG Term. on
TB2
sources
output.
Use 24VDC COMMMON
term. on TB1 for 4-20
OUT -SIG Term.
*10-0233_18VAC is a special
configuration allowing power
from an 18VAC~ power source
and is available by special
order. DO NOT APPLY 18VAC~
TO STANDARD UNITS!
4-20mA IN+ accepts milliamp signal inputs.
24VDC COMMON is
“RETURN” rail for
both 4-20mA Input and Output.
(See Block / Wiring diagram)
I/V
Amplifier
TB1
3
2
1
10ohm R13
Amplifier
V/I
+
TB2
3
2
1
A/D
Transmitter
2-Wire
3-Wire
+4-20mA Input
24VDC Common
Neg
+24VDC Output
4-20mA
(Unregulated)
5-Watt
D/A
Microcontroller
+4-20mA OUTPUT
Wiring
Monitor
Field
18VAC~
4-20mA OUTPUT
Pos
18VAC~
Bridge
Rectifier
Filter
Capacitor
Supply board with
I/O Power
18VAC Power Input
(Order 10-0233-18VAC)
1
2
3
1
2
3
4
4
Electrochemical
+4-20mA OUTPUT
Figure 7-2: 10-0233-18VAC Block / Wiring Diagram
7.3
Special Order; 4-20mA Input to Bridge Channel
A special model SenSmart 3000 is available for applications requiring a 4-20mA input (includes
I/O Power Supply part # 10-0233-4-20mA). Solder bridges are factory installed to rewire TB1 to
continue 24VDC power on to a 4-20mA transmitter as shown in Figure 7-3 below.