3.3.3 Scaling of Analog and Pulse References and FeedbackReferences and feedback are scaled from analog and pulse inputs in the same way. The only difference is that a reference above or below the specifiedminimum and maximum “endpoints” (P1 and P2 in the graph below) are clamped whereas a feedback above or below is not.The endpoints P1 and P2 are defined by the following parameters depending on which analog or pulse input is usedAnalog 53S201=OFFAnalog 53S201=ONAnalog 54S202=OFFAnalog 54S202=ONPulse Input 29 Pulse Input 33P1 = (Minimum input value, Minimum reference value)Minimum reference value par. 6-14Ter-minal 53 LowRef./Feedb.Valuepar. 6-14Termi-nal 53 Low Ref./Feedb. Valuepar. 6-24Ter-minal 54 LowRef./Feedb.Valuepar. 6-24Termi-nal 54 Low Ref./Feedb. Valuepar. 5-52Term.29 Low Ref./Feedb. Valuepar. 5-57Term. 33Low Ref./Feedb. ValueMinimum input value par. 6-10Ter-minal 53 LowVoltage [V]par. 6-12Termi-nal 53 Low Cur-rent [mA]par. 6-20Ter-minal 54 LowVoltage [V]par. 6-22Termi-nal 54 Low Cur-rent [mA]par. 5-50Term.29 Low Frequen-cy [Hz]par. 5-55Term. 33Low Frequency [Hz]P2 = (Maximum input value, Maximum reference value)Maximum reference value par. 6-15Ter-minal 53 HighRef./Feedb.Valuepar. 6-15Termi-nal 53 High Ref./Feedb. Valuepar. 6-25Ter-minal 54 HighRef./Feedb.Valuepar. 6-25Termi-nal 54 High Ref./Feedb. Valuepar. 5-53Term.29 High Ref./Feedb. Valuepar. 5-58Term. 33High Ref./Feedb. Val-ueMaximum input value par. 6-11Ter-minal 53 HighVoltage [V]par. 6-13Termi-nal 53 High Cur-rent [mA]par. 6-21Ter-minal 54 HighVoltage[V]par. 6-23Termi-nal 54 High Cur-rent[mA]par. 5-51Term.29 High Fre-quency [Hz]par. 5-56Term. 33High Frequency [Hz]3.3.4 Dead Band Around ZeroIn some cases the reference (in rare cases also the feedback) should have a Dead Band around zero (i.e. to make sure the machine is stopped when thereference is “near zero”).To make the dead band active and to set the amount of dead band, the following settings must be done:• Either Minimum Reference Value (see table above for relevant parameter) or Maximum Reference Value must be zero. In other words; EitherP1 or P2 must be on the X-axis in the graph below.• And both points defining the scaling graph are in the same quadrant.FC 300 Design Guide 3 Introduction to AutomationDrive FC 300MG.33.BC.02 - VLT® is a registered Danfoss trademark 273
