Vacon 100 hvac Applications Manual

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Vacon 100 hvac Applications Manual Manual pdf 148 page image

P3.9.12 STALL CURRENT (ID710)You can set the value of this parameter between 0.0 and 2*IL. For a stall status to occur, thecurrent must be higher than this limit. If parameter P3.1.1.7 Motor Current Limit changes,this parameter is automatically calculated to 90% of the current limit.NOTE!The value of the Stall Current must be below the motor current limit.fIID710ID712Stall areaFig. 26: The stall characteristics settingsP3.9.13 STALL TIME LIMIT (ID711)You can set the value of this parameter between 1.0 and 120.0 s. This is the maximum timefor the stall status to be active. An internal counter counts the stall time.If the stall time counter value goes above this limit, the protection causes the drive to trip.9.7.3 UNDERLOAD (DRY PUMP) PROTECTIONThe motor underload protection makes sure that there is a load on the motor when the driveoperates. If the motor loses the load, a problem can occur in the process. For example, a beltcan break or a pump become dry.You can adjust the motor underload protection with parameters P3.9.16 (UnderloadProtection: Field Weakening Area Load) and P3.9.17 (Underload Protection: Zero FrequencyLoad). The underload curve is a squared curve between the zero frequency and the fieldweakening point. The protection is not active below 5 Hz. The underload time counter doesnot operate below 5 Hz.The values of the underload protection parameters are set in percentage of the nominaltorque of the motor. To find the scaling ratio for the internal torque value, use the data in thename plate data of the motor, the motor nominal current and the nominal current of thedrive IL. If you use another current than the nominal motor current, the precision of thecalculation decreases.VACON · 148 PARAMETER DESCRIPTIONS9 TEL. +358 (0)201 2121 · FAX +358 (0)201 212 205