Dwyer MTL5045 User Manual
Page 26
Table 6.10
6.19
MTL5043 repeater power supply
dual output, 4 to 20mA for 2-wire
transmitters
The MTL5043 provides fully-floating dc supplies for a single
conventional 2-wire 4 to 20mA transmitter located in a hazardous area
and driving two safe-area loads. The MTL5043 design changed to
add HART functionality at the end of 2003.
6.19.1
Wiring connections (earlier non-HART version)
See figure 6.40 for wiring connections.
6.19.2
Wiring connections (HART version)
See figure 6.41 for wiring connections.
22
INM5000-6 Jul 2010
Current
Current
Voltage
Voltage
Output
reading
reading
(terminal 2 with respect
(terminal 2 with respect
current
(A1)
(A1)
to terminal 1)
to terminal 1)
(A2)
(MTL5041)
(MTL5042)
(MTL5041)
(MTL5042)
4 to 20mA
<±20µA
<±10µA
—
—
20mA
—
—
>16.5V
>16.5V
6.19.3
Testing
Make the safe- and hazardous-area connections shown in figure 6.42
and, using RVI to vary the output current, carry out the following checks:
6.20
MTL5044 repeater power supply
The MTL5044 provides fully-floating dc supplies for two conventional 2-
wire 4 to 20mA transmitters located in a hazardous area and repeating
the current in two floating circuits to drive two safe-area loads.
6.20.1
Wiring connections
See figure 6.43 for wiring connections.
Safe area
Figure 6.40: MTL5043 wiring diagram and connections
Hazardous area
Safe area
Hazardous area
7
8
9
6
5
4
3
2
1
13
14
10
11
12
I
I
I
Vs
Vs+
20 to 35V dc
+
4/20mA
4/20mA
Load
+
4/20mA
Load
+
HHC
HHC
7
8
9
6
5
4
3
2
1
13
14
10
11
12
I
I
I
V
Vs
Vs+
20 to 35V dc
+
4/20mA
4/20mA
Load 2
+
4/20mA
Load 1
+
+
4/20mA
current
source mode
current
sink mode
Figure 6.41: MTL5043 wiring diagram and connections
Terminal
Function
1
Input –ve
2
Input +ve
7
Output –ve (Ch 2 passive current sink)
8
Output –ve (Ch 2 active/+ve current sink)
9
Output +ve (Ch 2 active)
10
Output +ve (Ch 1 via 220
Ω for HART apps.)
11
Output –ve (Ch 1)
12
Output +ve (Ch 1)
13
Supply –ve
14
Supply +ve
6
5
4
3
2
1
7
8
9
10
11
12
13
14
I
I
I
I
Ch 2
Ch 1
Vs
Vs+
20 to 35V dc
4/20mA
Load
+
4/20mA
Load
+
+
4/20mA
+
4/20mA
Ch 2
Ch 1
Figure 6.43: MTL5044 wiring diagram and connections
Hazardous area
Safe area
Output
Current
Voltage
current
reading
terminal 2 with
(A2)
(A1)
respect to terminal 1)
4 to 20mA
<±20µA
—
20mA
—
>16.5V
6
5
4
3
2
1
7
8
9
10
11
12
13
14
I
I
I
Vs
Vs+
20 to 35V dc
10kW lin
RV1
A1
A2
+
+
Output 1
Output 2
+
Figure 6.42: Test circuit for MTL5043
Terminal
Function
1
Input –ve (Ch 1)
2
Input +ve (Ch 1)
4
Input –ve (Ch 2)
5
Input +ve (Ch 2)
8
Output –ve (Ch 2)
9
Output +ve (Ch 2)
11
Output –ve (Ch 1)
12
Output +ve (Ch 1)
13
Supply -ve
14
Supply +ve
Terminal
Function
1
Input –ve
2
Input +ve
8
Output –ve (Ch 2)
9
Output +ve (Ch 2)
11
Output –ve (Ch 1)
12
Output +ve (Ch 1)
13
Supply –ve
14
Supply +ve