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SP7Control functionsThis table describes the protection provided by MP 204.Control parameters Function Problem AdvantagesMSThe motor temperature is measured bymeans of the built-in Tempcon temperaturetransmitter and a signal is sent to MP 204 viathe phase leads. In MP 204 the measuredtemperature is compared with the factory-setvalue (167 °F (75 °C)).Overload, frequentstarts/stops, operationagainst blocked dischargepipe, insufficient flowvelocity past the motor.Longer motor life,safe operatingconditions, serviceindication.AccessoriesTemperatureOvervoltage/undervoltageOverloadUnderload(dry running)Current unbalancePhase sequencePhase failureMMSThe motor temperature is measured bymeans of the Pt100. The signal is sent to theMP 204 where the measured temperature iscompared with the factory-set value.Temperature protection requires asubmersible motor with a Pt100.The motor temperature must be monitoredduring frequency converter operation.If the set trip value is exceeded, the motor willstop.The motor power input is measured on eachof the three phases. The registered powerinput is an average of these three values. Ifthe factory-set value is exceeded, the motorwill stop.The motor power input is measured on eachof the three phases. The registered powerinput is an average of these three values. Ifthe average value is lower than thefactory-set value, the motor will stop.The power input of the motor is measured oneach of the three phases.MP 204 and motor are installed so that thephase sequence corresponds to correctdirection of rotation. MP 204 monitorschanges in the phase sequence.MP 204 checks the phases connected, phasefailure will cause an alarm.The installation is close toa transformer. The mainsdo not absorb loadvariations.Incorrect sizing ofpump/motor, voltagesupply failure, defectivecable, blocking, wear orcorrosion.Pump exposed to dryrunning or underload, forexample caused by wear.Mains load is uneven,incipient motor defect,phase voltages diverging.Two phases are wronglyconnected.Phase failureImportant installationparameter,possibility ofimproving operatingconditions.Longer pump life,safe operatingconditions, serviceindication.Traditionaldry-runningprotection is nolonger necessary, noextra cables.Motor protectionagainst overload,service indication.Ensures correctpump performance.Indication of phasefailure, and alarm.89