Analogue Output Modules; Mtl5546/Mtl5546Y/Mtl5546Y-T - Isolating Driver - Eaton MTL5501-SR Instruction Manual

6 .5
The analogue output (AO) modules accept 4/20mA floating signals from safe-area controllers to
drive current/pressure converters (or any other load up to 800Ω) in a hazardous area.
6 .5 .1
Single channel, for 4/20mA HART® valve positioners with line-fault detection
The MTL5546 accepts a 4/20mA floating signal from a safe-area controller to drive a current/
pressure converter (or any other load up to 800Ω) in a hazardous area. For HART valve
positioners, the module also permits bi-directional transmission of digital communication
signals so that the device can be interrogated either from the operator station or by a hand-held
communicator. Process controllers with a readback facility can detect open or short circuits in
the field wiring: if these occur, the current taken into the terminals drops to a preset level. The
MTL5546Y(-T) is very similar to the MTL5546 except that it provides open circuit detection only
(i.e. no short-circuit detection).
MTL5546
PWR
MTL5546Y
PWR
Figure 6 .25:
Top labels
for MTL5546
& MTL5546Y
46

Analogue Output modules

MTL5546/MTL5546Y(-T) - Isolating Driver
Hazardous area
+
P
4/20mA
I
–
Terminal Function
1 Output –ve
2 Output +ve
11 Input –ve
12 Input +ve
13 Supply –ve
14 Supply +ve
Input characteristics
Field wiring state
Normal
Open-circuit
Short-circuit
Safe area
6 7
5 8
4 9
I
10
3
–
11
2
4/20mA
I
12
1
+
13
14
20 to 35V dc
MTL5546 MTL5546Y
<6.0V
<0.9mA <0.5mA
<0.9mA
Vs–
Vs+
<6.0V
N.A.
INM 5500 Rev 10