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ATV28 trips with SCF, driving a submerged pump. ATV38 runs without any problem in the same case!

Goals and Symptoms

ATV28 trips with SCF, driving a submerged pump. ATV38 runs without any problem in the same case!

Facts and Changes

ATV28 submerged pump we often have this problems with ATV28

Causes and Fixes

This fault is detected by the ZCT (zero current transformer).
Trip level is a differential current > 2.5 A

But if there is a 2.5A leakage current (or unbalance between phase)

So we advise to check the earth and unbalanced current with an oscilloscope at the moment of the fault.
If the cable is shielded check that it is correctly connect (no high current circulation in the shield).
Test with disconnecting one side of the shield.
Test with a motor inductance (may be the capacitance of cable and motor is high and generate leak current peak.
Check that the supply voltage is stable and at the good value when the fault occurs.

Concerning the ATV38, it's not similar process.

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