ABB DSQC 664 3HAC030923-001 Drive Unit
Step 1: Locate the OP AMP U2 and place a precision DC voltage meter on the output (case) of U2, thus providing a precision DC voltage reading between the output and ground. This will be referred to as the DC offset.
Step 2:With the DC offset from U2 recorded, locate the OP AMP U3 and place a precision DC voltage meter between the output (case) of U3 and ground.
Step 3:Locate the calibration trim pot R17 and alter the resistance value by trimming the pot to provide U3 with the same exact DC offset as was recorded for U2.
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