FieldPort SWA50
Electrical connection
Hauser
29
6
Electrical connection
6.1
Supply voltage
• Loop-powered 4 to 20 mA
• 24 V DC (min. 4 V DC, max. 30 V DC): min. 3.6 mA loop current required for start-up
• The supply voltage or the power unit must be tested to ensure it meets safety
requirements and the requirements for SELV, PELV or Class 2
Voltage drop
• If internal HART communication resistor is deactivated
• 3.2 V in operation
• < 3.8 V at start-up
• If internal HART communication resistor is activated (270 Ohm)
• < 4.2 V at 3.6 mA loop current
• < 9.3 V at 22.5 mA loop current
To select the supply voltage, pay attention to the voltage drop via the FieldPort
SWA50. The remaining voltage must be high enough to enable the start-up and
operation of the HART field device.
6.2
Cable specification
Use cables that are suitable for the anticipated minimum and maximum temperatures.
Observe grounding concept of the plant.
2 x 0.25 mm² to 2 x 1.5 mm²
You can use unshielded cable with or without ferrules and shielded cable with or without
ferrules.
If you select the "direct mounting" version and the "4-wire HART field device with
active current output and PLC or transmitter" electrical connection version, you can
use core cross-sections of 0.75 mm² at maximum. If larger core cross-sections are
required, we recommend remote mounting.
6.3
Terminal assignment
1
2
1 234
ON
OFF
–
+
IN
OUT
–
+
-
+
IN
OUT
–
+
A0040495
8
FieldPort SWA50 terminal assignment
1
Input terminal IN
2
Output terminal OUT
