Danfoss FC 300 Design Manual

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Danfoss FC 300 Design Manual Manual pdf 29 page image

3.2.10. Scaling of References and FeedbackReferences and feedback are scaled from analog and pulse inputs in the same way. The onlydifference is that a reference above or below the specified minimum and maximum “endpoints” (P1and 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 orpulse input is usedAnalog 53S201=OFFAnalog 53S201=ONAnalog 54S202=OFFAnalog 54S202=ONPulse Input29Pulse Input 33P1 = (Minimum input value, Minimum reference value)Minimum reference val-uePar. 6-14 Par. 6-14 Par. 6-24 Par. 6-24 Par. 5-52 Par. 5-57Minimum input value Par. 6-10 [V] Par. 6-12[mA]Par. 6-20 [V] Par. 6-22[mA]Par. 5-50[Hz]Par. 5-55 [Hz]P2 = (Maximum input value, Maximum reference value)Maximum reference val-uePar. 6-15 Par. 6-15 Par. 6-25 Par. 6-25 Par. 5-53 Par. 5-58Maximum input value Par. 6-11 [V] Par. 6-13[mA]Par. 6-21 [V] Par. 6-23[mA]Par. 5-51[Hz]Par. 5-56 [Hz]3.2.11. Dead Band Around ZeroIn some cases, the reference (in rare cases also the feedback) should have a Dead Band aroundzero (in order to ensure that the machine is stopped when the reference is “near zero”).To make the dead band active and to set the amount of dead band, the followingsettings must be made:• Either Minimum Reference Value (see table above for relevant parameter) or MaximumReference Value must be zero. In other words, either P1 or P2 must be on the X-axis inthe graph below.• And both points defining the scaling graph are in the same quadrant.The size of the Dead Band is defined by either P1 or P2 as shown in the graph below.FC 300 Design Guide 3. Introduction to FC 300MG.33.B9.22 - VLT® is a registered Danfoss trademark. 293