Setting 4 - 20 Ma D/A Trim; Setting The 4 Ma Trim; Setting The 20 Ma Trim - ABB LWT300 series User Manual

Setting 4 – 20 mA D/A trim
LWT instruments are factory-calibrated to reflect the published declared performance specifications.
No further calibration is required in normal usage condition.
Once an LWT is installed and wired, the field wiring and other current loop components may affect the
mA output that is received at the point of control. The D/A trim is used to compensate for the presence
of the loop components and allow the point of control to receive a true 4 mA and 20 mA currents.
Performing this calibration requires a 24 V DC input in series with an ammeter.
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Figure 40 Setting the D/A trim
3.09 A

Setting the 4 mA trim

To set the 4 mA trim:
1 Select Calibrate > 4-20 mA D/A Trim > 4 mA Trim.
2 Press Edit.
3 Change the default value to the value indicated on the ammeter and press OK.

Setting the 20 mA trim

To set the 20 mA trim:
1 Select Calibrate > 4-20 mA D/A Trim > 20 mA Trim.
2 Press Edit.
3 Change the default value to the value indicated on the ammeter and press OK.
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User Guide