5-32
Adjustments
Motor acceleration time (n5-02)
The motor acceleration time n5-02 the time which is needed to accelerate to rated speed with the rated torque
of the motor. The time can be estimated like follows:
• Make the general setup (V/f pattern, Motor Setup, etc.)
• Balance the elevator (car in middle position, Car weight = Counter weight)
• Set the torque limits to 100% using the L7- parameters.
• Set the acceleration time very short (the inverter must reach the torque limit very fast).
• Start in any direction and measure the time from zero speed to top speed.
• Set this time in n5-02.
Feed Forward Gain (n5-03)
This value usually has not to be changed.
• Increase the time to improve the response to the speed reference
• Decrease the time if vibrations occur
Improving the Leveling Accuracy by Slip compensation
This function can be used in V/f and Open Loop Vector control to compensate the motor slip influence at low
speed under different load conditions. Thereby the leveling accuracy can be improved.
The inverter measures the current level or torque reference 1.0 sec after speed-agree condition (acceleration
finished) for 0.5 sec and calculates the average value to estimate the load. This value is used for the calculation
of slip which is added to the speed reference at leveling speed (see Fig 5.13).
Fig 5.13 Slip Compensation Working Principle
Related Parameters
Parameter
No.
Name
Factory
setting
Change
during
operation
V/f
Open
Loop
Vector
Closed
Loop
Vector
S2-01 Motor Rated rpm 1380rpm No A No No
S2-02 Slip Compensation Gain at Motoring 0.7 No A A No
S2-03 Slip Compensation Gain at Regenerating 1.0 No A A No
S2-07 Slip Compensation primary Delay Time 200ms No No A No
measure
apply
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