4�7 Electrical Connections - Honeywell Midas User Manual

4.7 Electrical Connections
Midas can be powered by either 24 VDC via
®
traditional discrete wiring or by approximately 48
VDC delivered through the Ethernet cable from
a PoE source. In either case the 4-20 mA analog
output can be used. This can be configured for
fully isolated operation. With 24 VDC power the
4-20 mA output can be configured for sink, source
or isolated output operations. Below are some
schematic diagrams of typical electrical connection
Diagram 4-7. Generic Example
Midas 4-Wire Isolated Output
®
MIDAS
Simplified Internal Schematic
2
+
+
Internal
Current Source
24 VDC
Power
Loads
-
-
1
Diagram 4-8. Generic Example
Midas 3-Wire Sourcing
®
MIDAS
Simplified Internal Schematic
2
+
+
Controlled
Internal
Current Source
24 VDC
Power
Loads
-
-
1
J4
INT EXT
11
+
24 VDC
4-20 mA
-
Controlled
10
J5
EXT INT
R
Load
9
J4
INT EXT
11
4-20 mA
10
J5
EXT INT
R
9 Load
Midas
configurations. Specific wiring instructions for
connecting a Midas to a Honeywell Analytics Sieger
System-57 are provided on pages 4-12 to 4-16.
TM
Specific instructions for connection to a Honeywell
Analytics TouchPoint
and 4-18 and the HA71 on pages 4-19 and 4-20.
Note:
When wiring the Midas Transmitter to a
controller, program the controller for a 1-2
second delay before reporting to prevent
false alarms.
Diagram 4-9. Generic Example
Midas
®
MIDAS
Simplified Internal Schematic
2
+
+
Internal
24 VDC
Power
Loads
-
-
1
Diagram 4-10. Generic Example
Midas Isolated 4-20 mA Output w/PoE Power
®
MIDAS
Simplified Internal Schematic
2
+
+
Internal
Ethernet
Power
48 VDC
- Loads
-
1
4-11
Gas Detector
®
are provided on pages 4-17
TM
3-Wire Sinking Output
R
J4
INT EXT
11
4-20 mA
Controlled
Current Source
10
J5
EXT INT
9
J4
INT EXT
11
24 VDC
4-20 mA
Controlled
Current Source
10
J5
EXT INT
R
Load
9
Load
+
-