Danfoss VLT AQUA Drive FC 202 Programming Manual

Also see for VLT AQUA Drive FC 202: Service guide Installation guide Installation guide Operating guide Installation guide

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22-61 Broken Belt TorqueRange: Function:10 %* [0 - 100 %] Sets the broken-belt torque as a percentageof the rated motor torque.22-62 Broken Belt DelayRange: Function:10 s [0 - 600s]Sets the time for which the broken beltconditions must be active before carrying outthe action selected in parameter 22-60 BrokenBelt Function.3.19.7 22-7* Short Cycle ProtectionIn some applications, a need for limiting the numbers ofstarts often exists. One way to do this is to ensure aminimum run time (time between a start and a stop) and aminimum interval between starts.This means that any normal stop command can beoverridden by parameter 22-77 Minimum Run Time and anynormal start command (start/jog/freeze) can be overriddenby parameter 22-76 Interval between Starts.None of the 2 functions are active if hand-on mode or offmode have been activated via the LCP. If pressing [HandOn] or [Off], the 2 timers are reset to 0 and do not startcounting until [Auto On] is pressed, and an active startcommand is applied.22-75 Short Cycle ProtectionOption: Function:[0] * Disabled Timer set in parameter 22-76 Interval betweenStarts is disabled.[1] Enabled Timer set in parameter 22-76 Interval betweenStarts is enabled.22-76 Interval between StartsRange: Function:Size related* [ par. 22-77 -3600 s]Sets the minimum time between 2starts. Any normal start command(start/jog/freeze) is disregardeduntil the timer has expired.22-77 Minimum Run TimeRange: Function:0 s* [ 0 - par.22-76 s]NOTICEDoes not work in cascade mode.Sets the minimum run time after a normal startcommand (start/jog/freeze). Any normal stopcommand is disregarded until the set time has22-77 Minimum Run TimeRange: Function:expired. The timer starts counting following anormal start command (start/jog/freeze).A coast (inverse) or an external interlockcommand overrides the timer.22-78 Minimum Run Time OverrideOption: Function:[0] * Disabled[1] Enabled22-79 Minimum Run Time Override ValueRange: Function:0 ProcessCtrlUnit* [-999999.999 - 999999.999ProcessCtrlUnit]3.19.8 22-8* Flow CompensationIn certain applications, it is not possible for a pressuretransducer to be placed at a remote point in the system,and it can only be located close to the fan/pump outlet.Flow compensation operates by adjusting the setpointaccording to the output frequency, which is almost propor-tional to flow. Thus, it compensates for higher losses athigher flow rates.HDESIGN (required pressure) is the setpoint for closed-loop(PI) operation of the frequency converter and is set as forclosed-loop operation without flow compensation.130BA383.11Illustration 3.70 Flow Compensation Set-upThere are 2 methods which can be employed, dependingon whether the speed at system design working point isknown.Parameter Description Programming GuideMG20OB02 Danfoss A/S © 05/2018 All rights reserved. 1873 3