Veris Industries H221 Install - Manual (Page 4)

Z201198-0F Page 4 of 4 ©2013 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected] 06131
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Installation Guide
Current Sensors
H221/H221SP
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 H221SP 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.
0A
Controller:
4mA Output =
0A Load
0A
Zero
Zero
Out
Span
100 300
150 A
300 100
Zero
Out
Span
100 300
A
OK!
200 A
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.
16 mA x — + 4 mA
B
A
16 mA x — + 4 mA
150
200
150A
Controller:
16 mA Output
= 150 A Load
150A
Calibration
(H221 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.