Install Instructions

SOLID CORE AND SPLIT CORE 4-20 MA OUTPUT CURRENT SENSORS
3 31-00142—01
Application Example
Fig. 3. Analog circuit.
TROUBLESHOOTING
Table 2. Troubleshooting.
CURRENT CONVERSION FORMULAS
WEEE DIRECTIVE
At the end of their useful life the packaging and product should be disposed of via a suitable recycling center. Do not
dispose of with household waste. Do not burn.
M37403
SHIELDED CABLE
AI
COMMON
GND (SHIELDED)
BUILDING AUTOMATION
SYSTEM
4 TO 20mA
SIGNAL INPUT
+
DC
POWER
SUPPLY
13.5 TO 30 VDC
–
Problem Solution
No reading • Confirm that you have +13.5 to 30VDC in series with the current sensor output terminals and the analog input of the
control panel.
• Check the polarity of the circuit.
• Verify that the terminals are screwed down, wires are firmly in place.
• Disconnect the input to the control panel and then insert a current meter (mA range) in series with the current sensor
output to verify that the circuit is working properly.
Erratic readings • Verify that the wires are terminated properly.
• Check that the +13.5 to 30VDC input is clean. In areas of high RF interference, shielded cable may be necessary to
stabilize signal.
Inaccurate readings • If you suspect that the current sensor is not reading within the accuracy specifications, please contact the factory for
assistance.
Current Sensor is operating at
a low-level current or failing to
operate within the accuracy
specifications.
• Visually check the mating parts of the core to ensure there is no debris between the split contacts. See Fig. 2.
• Remove all debris or dust manually and close the current sensor.
• Continue to retest the sensor in your application.
TO CONVERT THE CURRENT SENSOR OUTPUT SIGNAL TO A CURRENT READING:
4-20mA output to Current reading
(4mA = 0 Amps and 20mA = 250 Amps for A/CTA2-250)
Example: 12mA current sensor output signal
Total Span = 250 Amps
Multiplier = 20mA-4mA/Total Span = 0.064
(12mA-4mA)/0.064= 125 AMPS