Lenze DSD - Manual (Page 301)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
301
10 Structure of the drive axis
10.3 Drive concept
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10.3.5.1 Encoderless motor control for vertical conveyors/hoists
An application is defined as a vertical conveyor if the gravitational force acts significantly on the mo-
tor torque. Cable-guided hoists and linear applications with an angle of tilt of more than 45° (belt
drives, rack drives, spindle drives, travelling drives) are recognised as vertical conveyors by DSD.
Drive systems for vertical conveyors must ensure a reliable and continuous operation of the appli-
cation at all times. For this task, a special motor management is required.
Drive systems with feedback are very well-suited for vertical conveyors. For applications without
feedback, the motor management must also ensure a continuous and safe operation of the drive,
even without encoder, and for the transition phases lifting/lowering and lowering/lifting in partic-
ular. During this four-quadrant operation, the motor control must also ensure safe operation of the
"Zero-Hertz field frequency" operating status.
DSD efficiently supports the user during the drive dimensioning phase and
• provides suitable control types and encoderless drive systems for certain power ranges,
• considers the operating behaviour of the drive system during the dimensioning phase,
• checks necessary overdimensioning of the drive components and the max. permissible motor
utilisation,
• detects the utilisation of the selected drive components,
• signalises exceedances of limit values by means of warning signals or notes.