Output module of a drive control system

A drive control system for an electrical drive, having an output module, a further output module and a feed module, the drive control system being an electrical supply network via the feed module, the output module, the further output module and the feed module being connected between a DC voltage intermediate circuit,

• the output module and the further output module each having a frequency converter which is connected between a DC voltage intermediate circuit and an output of the output module, the frequency converter being configured to convert a DC voltage of the DC voltage intermediate circuit into an AC voltage at the output of the output module, and
• the output module and the further output module each having a module controller for controlling the frequency converter,
• the module controller of the output module being configured to control the frequency converter in a first operating mode of the output module, in the first operating mode an electrical motor being connected to the output module, in such a manner that the electrical motor is driven with an electrical drive current from the DC voltage intermediate circuit via the output, and
• the module controller of the further output module being configured to control the frequency converter in a second operating mode of the further output module, in the second operating mode the electrical supply network being connected to the output module, in such a manner that an electrical feedback current from the DC voltage intermediate circuit is fed back into the electrical supply network via the output.

A method for operating an output module which can be connected to a DC voltage intermediate circuit of a drive control system for an electrical drive, the output module having a frequency converter which can be connected between the DC voltage intermediate circuit and an output of the output module, the frequency converter being configured to convert a DC voltage of the DC voltage intermediate circuit into an AC voltage at the output of the output module,

• the method comprising checking an operating mode of a module controller of the output module,
• the method also comprising if a first operating mode, in the first operating mode an electrical motor being connected to the output module, has been determined:
• controlling a frequency converter of the output module via a current regulating module based on a value set by a rotational speed regulating module in order to drive the electrical motor with an electrical drive current from the DC voltage intermediate circuit via an output of the output module, and
• the method also comprising if a second operating mode, in the second operating mode an electrical supply network being connected to the output module, has been determined:
• controlling the frequency converter of the output module via the current regulating module based on a value set by a feedback regulating module in order to feed an electrical feedback current from the DC voltage intermediate circuit back into an electrical supply network via the output.