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•Adjustments<br />
Motor acceleration time (n5-02)<br />
The motor acceleration time n5-02 the time which is needed to accelerate the to the rated speed with the rated<br />
torque of the motor. The time can be estimated like follows:<br />
• Make the general setup (V/f pattern, Motor Setup, etc.)<br />
• Balance the elevator (car in middle position, Car weight = Counter weight)<br />
• Set the torque limits to 100% using the L7- parameters.<br />
• Set the acceleration time very short (the inverter must reach the torque limit very fast).<br />
• Start in any direction and measure the time from zero speed to top speed.<br />
• Set this time in n5-02.<br />
Feed Forward Gain (n5-03)<br />
This value usually has not to be changed.<br />
• Increase the time to improve the response to the speed reference<br />
• Decrease the time if vibrations occur<br />
Improving the Leveling Accuracy by Slip compensation<br />
This function can be used in V/f and Open Loop Vector control to compensate the motor slip influence at low<br />
speed under different load conditions. Thereby the leveling accuracy can be improved.<br />
The inverter measures the current level or torque reference 1.0 sec after speed-agree condition (acceleration<br />
finished) for 0.5 sec and calculates the average value to estimate the load. This value is used for the calculation<br />
of slip which is added to the speed reference at leveling speed (see Fig 5.42).<br />
measure<br />
apply<br />
Fig 5.42 Slip Compensation Working Principle<br />
•Related Parameters<br />
Parameter<br />
No.<br />
Name<br />
Factory<br />
setting<br />
Change<br />
during<br />
operation<br />
V/f<br />
Open<br />
Loop<br />
Vector<br />
S2-01 Motor Rated rpm 1380rpm No A No No<br />
S2-02 Slip Compensation Gain at Motoring 0.7 No A A No<br />
S2-03 Slip Compensation Gain at Regenerating 1.0 No A A No<br />
S2-07 Slip Compensation primary Delay Time 200ms No No A No<br />
Closed<br />
Loop<br />
Vector<br />
5-32