NominalSpeedLinear

General

Functional Description

Serves to display the rated speed of the motor in m/s. This value is determined during the phase up of the Sercos.

If UserMaxVel = 0, the default value for the parameter MaxVel [units/second] is identical to the rated speed [m/s].

A shutdown due to overspeed is at 111.1 % of MaxVel.

If a motor has MaxSpeedLinear < NominalSpeedLinear (for example, because of a too low maximum 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 MaxSpeedLinear.

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).

NOTE: The parameter value is transferred from the slave to the master via the parameter channel of the Sercos by every access. Typically, this takes about 10 ms. By a high capacity of the parameter channel, times up to 1 s can occur. If the Sercos bus is in phase 0 or 1, then a standard value is indicated here. If the Sercos bus is in phase 3 or 4, then the parameter value is transferred and indicated. In the Sercos phase 2, the parameter can be read through the application.