Honeywell CTP-20 Stud Sensor User Manual


 
SOLID CORE AND SPLIT CORE 4-20 MA OUTPUT CURRENT SENSORS
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Registered Trademark
© 2007 Honeywell International Inc.
62-0245—01 C.H. Rev. 06-07
TROUBLESHOOTING
CURRENT CONVERSION FORMULA
To convert the current sensor output signal to a current
reading.
Current reading = mA output/20 mA x Amp Span.
For example:
For a reading of 4 mA with a 0-250 Amp span:
Current reading = (4 mA/20 mA) x 250 A = 0 Amp.
(0/16) X 250 = 0
NOTE: 4 mA = 0 Amps
20 mA = 250 Amps
Problem Solution
No reading Confirm that you have +12 to 30 Vdc 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 +12 to 30 Vdc 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.