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E4102 = "power stage I2t".The drive creates a warning message (WarnLatched bit 30) and reduces to nominal current. There's no stop reaction in case of warnings.
A warning is an error class 0 meaning there's no reaction in transition. If there are warnings (error class 0), the two dots to the right of the 7-segment display (2) flash.
The parameters _WarnLatched and _SigLatched contain information on warnings and errors.
It's also possible to define an output for a warning or error.
The reason why the speed could drop to 0 is maybe because of reduced current or if there has been a stop command from the PLC.