34 Program featuresTimed function enables to configure the drive to automatically start and stop thepump at a desired time on any day of a week. The pump start and stop time canbe defined in the parameters 79.31 Pump start time and 79.32 Pump stop time.If the actual time is not set by the assistant control panel, the drive displays awarning and does not start.Note: The Timed function works only with assistant control panel.5. Fieldbus AWith the Fieldbus A mode, the drive can be started and stopped with the fieldbusdevice. You can define the fieldbus adapter parameters in the parameter group 50Fieldbus adapter (FBA) and the start/stop command can be provided from thecontrol bit of the fieldbus device which is connected to the drive.The speed references are provided by MPPT. For more information on MPPT, seesection MPPT functionality on page 34.6. Embedded fieldbusWith the Embedded fieldbus mode, the drive can be started and stopped with theembedded fieldbus. You can define the fieldbus adapter parameters in theparameter group 58 Embedded fieldbus and the start/stop command can beprovided from the control bit of the fieldbus device which is connected to the drive.The speed reference are provided by MPPT. For more information on MPPT, seesection MPPT functionality on page 34.SettingsParameter group 79 Start stop control (page 155). MPPT functionalityThe Maximum Power Point Tracking (MPPT) control program enables the motor tooperate at maximum power with the available DC voltage (PV cell voltage) andadjusts the speed reference of the drive based on the available DC voltage from thesolar panels.Some of the other features of MPPT program are:• Monitors the DC voltage continuously.• Controls sudden variation in DC voltage and avoids sudden change in motorspeed.• Reduces speed whenever the DC voltage decreases.• Avoids continuous start/stop of the motor in auto mode, if the drives fails to start atthe minimum voltage set.
