Eaton MTL4516 - MTL4544;MTL4544 S - Repeater Power Supply

INM 4500/4600 Rev 12
44
DRAFT - 22 March 2018 DRAFT - 22 March 2018
6.4.4 MTL4544/MTL4544S - Repeater Power Supply
Two channel, 4/20mA, HART® for 2- or 3-wire transmitters
The MTL4544 is intended for use as a replacement for a previous MTL4000 range of
modules on existing backplane installations. It provides fully-floating dc supplies for
energising two conventional 2-wire or 3-wire 4/20mA or HART transmitters located in a
hazardous area, and repeats the current in other circuits to drive two safe-area loads. For
HART transmitters, the unit allows bi-directional transmission of digital communication
signals superimposed on the 4/20mA loop current. Alternatively, the MTL4544S acts as
a current sink for a safe-area connection rather than driving a current into the load.
Seperately powered current sources, such as 4-wire transmitters, can be connected but
will not support HART communication.
Hazardous
area
Safe area
The MTL4544 or MTL4544S
can also be used to drive
two safe-area loads from
a single 2-wire transmitter
(i.e. 1 in, 2 out) by
interconnecting the input
channels as shown in the
diagram (right).
Note: In this mode the
HART data is transferred
via channel 1 output only.
See also the MTL4544D.
+
–
Vs–
Vs+
20 to 35V dc
4/20mA
I
I
I
I
6
5
4
3
2
1
9
8
7
12
11
10
14
Terminal Function
1 Ch1 current input
2 Ch1 transmitter supply +ve
3 Ch1 common
4 Ch2 current input
5 Ch2 transmitter supply +ve
6 Ch2 common
8 Ch1 output –ve (+ve current sink)
9 Ch1 output +ve (–ve current sink)
11 Ch2 output –ve (+ve current sink)
12 Ch2 output +ve (–ve current sink)
13 Supply –ve
14 Supply +ve
Hazardous area Safe area
+
–
4/20mA
Load
Ch 2
Ch 1
MTL4544 MTL4544S
4/20mA
4/20mA
Load
+
–
Vs–
Vs+
20 to 35V dc
Ch 2
Ch 1
+
–
4/20mA
Load
Load
+
–
Com
Tx+
Input
Com
Tx+
Input
I
I
I
I
6
5
4
3
2
1
9
8
7
12
11
10
13
14




Figure 6.27:
Top labels for
MTL4544 &
MTL4544S