Eaton Crouse-Hinds MTL5500 Series - Applications Involving Zone 2 And;Or Zone 22 Hazardous Areas

INM 5500 Rev 11
66
8.5.2 Testing MTL5553 - Isolator/power supply for 31.25kbits/s fieldbuses
Make the safe and hazardous-area connections shown in figure 10.2 and, substituting appropriate
resistors at Rtest, carry out the following checks.
R
test
Voltage across terminals 2 and 1 (V
1)
Open-circuit 17.8 < V
1
< 19V
220Ω 11.5V < V
1
< 13.5V
10Ω V
1
< 5V
20-35V dc
Vs-
Vs+
-ve
+ve
-ve
Host
(31.25kbit/s)
Terminator
1
2
4
5
6
3
2.6W Max
8
9
T
14
13
11
10
7
12
Link 7- 8 for Terminator
Hazardous Area Safe Area
V
1
R
test
+
-
Top Label, MTL5553
Test circuit for MTL5553