Danfoss VLT AutomationDrive FC 360 Application Manual

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Danfoss VLT AutomationDrive FC 360 Application Manual Manual pdf 16 page image

- Select [155] HW Limit Positive or [156]HW Limit Negative in parameters 5-10 to5-16.- Enable or disable the software positiveand negative limits in 33-44 PositiveSoftware Limit Active and 33-43 NegativeSoftware Limit Active respectively.For both hardware and software limits, set thepositive position in user units in 33-42 PositiveSoftware Limit, and negative position in user unitsin 33-41 Negative Software Limit.• Maximum allowed velocitySet the maximum allowed velocity in 32-80Maximum Allowed Velocity.Fault handlingSet the fault behavior in 37-17 Pos. Ctrl Fault Behaviour.Fault reasons can be read out from 37-18 Pos. Ctrl FaultReason.Brake settingsEnable or disable the auto brake control in 37-07 Pos. AutoBrake Ctrl. Set brake time in 37-09 Pos. Coast Delay, 37-11Pos. Brake Wear Limit, and 37-12 Pos. PID Anti Windup.4.2.3 Defining a User UnitThe frequency converter measures distance in quad-count(QC) internally. It is possible to define a user unit by usingparameter 32-11 User Unit Denominator andparameter 32-12 User Unit Numerator according to thefollowing formula:QC=UU*32-12 User Unit Numerator/32-11 User UnitDenominatorFor example, if the user unit is mm and, based onmeasurement, 100.25 mm corresponds to 2000 QC.2000 QC=100.25 UU, therefore:QC=(100.25/2000)UU=(401/8000)UU.Parameter 32-11 User Unit Denominator andparameter 32-12 User Unit Numerator can be set to 8000and 401 respectively.4.3 Homing4.3.1 Selecting Homing ModeFC 360 provides 3 homing modes. Select the homingmode in parameter 33-00 Homing Mode.The 3 modes are described in details as follows.• [0] Not forced modeIn this mode, homing is not conducted prior topositioning. If the go to home position commandis issued by digital inputs or PROFIBUS, thefrequency converter sets the current position ashome position.• [1] Forced manual modeIn this mode, homing is conducted prior topositioning. The homing direction is determinedby the sign of parameter 33-03 Homing Velocity.Find out the current position, and decide whetherit is in the forward or backward direction relativeto the home position.• [2] Forced automated mode In this mode, the homing process starts with thevelocity set in parameter 33-03 Homing Velocity,and the velocity will be reversed automaticallywhenever the hardware position limit is reacheduntil the home position is found. If the homeposition is not found after the hardware limits arereached twice, the alarm position ctrl. fault will bereported with fault reason can not find homeposition, which can be viewed inparameter 37-18 Pos. Ctrl Fault Reason.4.3.2 Homing Settings• Set the home offset in parameter 33-01 HomeOffset.• Set the homing velocity in parameter 33-02 HomeRamp Time.• Set the homing ramp time inparameter 33-03 Homing Velocity.• Select the homing type inparameter 33-04 Homing Behaviour.• Select 1 digital input as home reference switchinput by setting the corresponding digital inputparameter (5-10 to 5-16) to [151] Home Ref.Switch. Home reference switch input is used formarking the home position. Switching onindicates the home position is reached, andswitching off indicates the position is notreached.4.3.3 Homing ControlYou can control the homing process via digital inputs orPROFIBUS.• Digital inputsSelect a particular digital input as homing switchby setting the corresponding parameter (5-10 to5-16) to [151] Home Ref. Switch. In forced manualand automatic modes, switching on the digitalPositioning Control Application GuideMG06E102 Danfoss A/S © 11/2014 All rights reserved. 154 4