NominalSpeed

General

Functional Description

Is used to display the rated speed of the motor in RPM. This value is determined during the phase up of the Sercos.

The default value of the parameter MaxVel [units/second] equates by UserMaxVel = 0 the rated speed [RPM].

A shutdown because the limit speed is exceeded takes place at 111.1 % of MaxVel.

If a motor has MaxSpeed < NominalSpeed (for example, because of a too low encoder rotational speed), then the motor cannot be operated with the rated speed. In this case, the default value of MaxVel [units/seconds] is the velocity of MaxSpeed [RPM].

NOTE:  If the rated speed is exceeded, then the motor picks up less current by increasing rotational speed. The amplitude of the current depends on the momentary voltage in the DC bus. The current is reduced until a further increasing of the speed is not possible anymore. Depending on the EMC of the used motor, it is possible that MaxSpeedLinear cannot be reached (the typical DC bus voltage on a 3-phase 400 V network is 560 V, for MaxSpeedLinear up to 780 V are assumed). Provide that in the requested operating case of a machine enough current can be driven (see Drive sizing with Motion Builder).