NominalSpeed

General

Type

Devices supporting the parameter

Lexium LXM52 Drive,

Lexium LXM62 Drive,

Lexium ILM62 Drive Module

Traceable

–

Functional Description

The parameter represents 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], when UserMaxVel = 0, is the transformed value of NominalSpeed from RPM to units/second.

A shutdown occurs when the limit speed is exceeded at 111.1 % of MaxVel.

If a motor has MaxSpeed < NominalSpeed (for example, because the encoder rotational speed is too low), 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 transformed from RPM to units/second.

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 induced voltage of the motor used, it is possible that MaxSpeedLinear cannot be reached (the typical DC bus voltage on a 3-phase 400 V network is 560 V, even though MaxSpeedLinear requires up to 780 V). Verify that enough voltage/current is available for the speed requirements of your application (see Drive sizing with Motion Builder).