Vacon 20 CP/X Applications Manual

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Vacon 20 CP/X Applications Manual Manual pdf 58 page image

vacon • 55 Parameter description33.7 SupervisionsP7.1 F REQUENCY SUPERVISION FUNCTION0:No supervision1:Low limit2: High limitP7.2 F REQUENCY SUPERVISION LIMITThreshold value for frequency supervision.P7.3 CURRENT SUPERVISION LIMITThreshold value for current supervision.P7.4 A NALOGUE INPUT SUPERVISIONAnalogue input selection for supervision:0: AI11: AI22: AIE (analogue input on OPTB4 option board).P7.5 A NALOGUE SUPERV ON LEVELDigital output (programmed as Analogue input supervision) goes high when AI is higher thanvalue.P7.6 A NALOGUE SUPERV OFF LEVELDigital output (programmed as Analogue input supervision) goes low when AI is lower than val-ue.P7.7 E XTERNAL BRAKE OPEN FREQUENCY LIMITThis value is the output frequency limit of the drive to open the mechanical brake. In open loopcontrol, we recommend that you use a value that is equal to the nominal slip of the motor.P7.8 E XTERNAL BRAKE OPEN CURRENT LIMITThe Mechanical brake opens if the motor current is above the limit set in this parameter. Werecommend that you set the value to approximately half of the magnetization current.When the drive operates on the field weakening area, the brake current limit decreases auto-matically as a function of output frequency.Note: if a digital output has been programmed for brake control, the frequency reference is in-ternally limited to P7.7 + 0.1Hz until the brake is opened.P7.9 E XTERNAL BRAKE CLOSE FREQUENCY LIMITThe brake is closed when the start command is low and output frequency is below this thresh-old. The brake is also closed whenever the drive is no more in Run state.