Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone:
1-888-967-5224 |
Website:
workaci.com
Page 3
Version: 2.0
I0000857
FIGURE 5:
MULTIPLE TRANSMITTER CONNECTIONS
Power Supply
+ -
+ -
+ -
Temp.Transmitter #1
Temp.Transmitter #N
Temp.Transmitter #2
-
VDC
+
Controller
Gnd In1 In2 In3
= Connections
In1 = Controller Input #1
In2 = Controller Input #2
In3 = Controller Input #3
WIRING INSTRUCTIONS
(Continued)
Note:
All RTD’s are supplied with (2) or (3) flying lead
wires. ACI’s transmitters are supplied with a 2 pole
terminal block for RTD sensor connections. When wiring a
3 wire RTD, connect the (2) common wires (same color)
together into the same terminal block - see
FIGURE 4
(right).
Formula for Number of Transmitters
Several transmitters may be powered from the same supply
as shown in
FIGURE 5
(below). Each transmitter draws
25mA; refer to the following equation to obtain the number
of permissible transmitters:
[# Transmitters] = [Current] /
(25 mA)
.
FIGURE 4:
3 WIRE RTD
3 WIRE RTD
SAME COLOR WIRES
RTD
TROUBLESHOOTING
TEMPERATURE PROBLEM
No Reading
•
No power to board - check voltage at power terminal - should be b8.5 and 32 VDC.
Reading too Low
•
RTD wires shorted. Disconnect wies from terminal block and check with ohmmeter. Reading should be close to 100 Ω or 1 KΩ.
•
RTD Improper range of transmitter (too low). Check current or voltage - should be between 4-20 mA, 1-5 V, or 2-10 V.
Reading too High
•
RTD opened. Disconnect sensor wires from terminal block and check with ohmmeter. Reading should be close to 100 Ω or 1 KΩ.
•
Improper range of transmitter (too high). Check current or voltage - should be between 4-20 mA, 1-5 V, or 2-10 V.
Reading is Inaccurate
•
Sensor check:
Disconnect sensor wires from terminal block and check with ohmmeter. Compare the resistance reading
to the Temperature vs Resistance curves located on ACI’s website.
•
Transmitter check:
Make sure sensor wires are connected to terminal block. Determine that the proper output is being
transmitted based on predetermined span:
1. Go to ACI Website, Span to Output Page: http://www.workaci.com/content/span-output
2. Enter the low end of the span
3. Enter the high end of the span
4. Click on the output of the transmitter. This will generate a span to output chart.
5. Measure output of transmitter.
6. Compare measured output to calculated output
