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Why is the current reading on the S811 so off?

The S811+ current readings should be within 3% when the unit is in bypass.

However, when the S811+ is performing a soft start, the current readings can be off by 25% because the current signal is distorted by the SCR firing. The inaccuracy will be greater at the start of the ramp(Low starting torque) because the current signal has a greater “notch”( distortion ).

As the “notch” closes the current readings get more accurate.

 

S811+ /S801+ Product Overview