Z201200-0G
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Installation Guide
Current Sensors
H421/H421SP
TM
2. Calculate the maximum and target readings.
A. Determine the maximum current likely to occur in the application.
The following calculation is given as an example and uses
sample current values. In an actual application, any values
appropriate to the application (within the range of the device)
can be substituted.
The H421SP is factory-calibrated.
1. Set Zero.
Apply power to the sensor with no load
in the monitored conductor. Turn the
zero setpoint screw until the controller
reads 4 mA output.
B. Establish normal load conditions on the conductor. Measure this current using
an external measurement device, such as a portable amp clamp.
C. Calculate target output:
If A = the max. current, and B = the reading from the amp clamp, then:
target output =
e.g. target output = = 16 mA
3. Set Span.
Turn the span setpoint screw until the controller reading equals the target output.
Calibration
(H421 Only)
Troubleshooting
Problem
Solution
No Reading at Controller
• Confirm that a 12-30 VDC power supply is in series with the sensor output terminals and the control
panel analog input terminals.
• Assure that sensor core mating surfaces are clean and that the core clamp is completely closed.
1200 A
0A
Controller:
4mA Output =
0A Load
0A
Zero
Zero
Out
Span
1000 2400
A
OK!
1600 A
2400
1000
Zero
Out
Span
1000 2400
16 mA x — + 4 mA
B
A
16 mA x — + 4 mA
1200
1600
1200 A
Controller:
16 mA Output
= 1200 A Load
1200 A
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