NominalSpeedLinear

General

Functional Description

The parameter represents 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 an insufficient 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 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).

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. However, up to 1 s can be realized if large amounts of data are transferred on the parameter channel. If the Sercos bus is in phase 0 or 1, then a default 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.