Elevator inverter basics (b)

1, was written in the manual speed range 60 ~ 6Hz, namely 10:1, then the following 6Hz no output power do?
In 6Hz still output power, but according to the temperature rise and motor starting torque of the size of the other conditions, the lowest frequency of use to take 6Hz, at which point the motor rated torque can be output without causing severe heat problems. Actual elevator inverter output frequency (starting frequency) based on models for the 0.5 ~ 3Hz.
2, for the general motor combination is above 60Hz also requires a certain torque, can we?
Normally when not. Above 60Hz (50Hz or more modes also) voltage constant, a substantially constant power characteristics, require the same torque at high speed, we must pay attention to the choice of motor and elevator inverter capacity
3, the so-called open-loop What does it mean?
Motor means to be used for speed detection device (PG), the actual speed back to the control means controls, called "closed loop", without PG operation is called "open loop." Universal Converter, mostly open-loop mode, and some models can be use PG feedback option.
4, the actual speed deviation for a given speed on how to do?
Open loop, even if the output for a given frequency of the elevator inverter, the motor with the load operation, the motor speed at the rated slip of the range (1% to 5%) change. For applications requiring speed accuracy is relatively high, even if the load change also requires close to a given speed operation of the occasion, PG feedback function can be used with the drive (optional part).
5, if a motor with PG, feedback can improve speed accuracy after you?
With PG feedback function of the elevator inverter, the accuracy improves. But the speed depends on the accuracy of implant PG itself elevator inverter output frequency accuracy and resolution.
6, stall prevention function is what does this mean?
If the given acceleration time is too short, the elevator inverter output frequency changes much more than speed (electrical angular frequency) change, the drive will overcurrent flows due to trip, running stop, which is called stall. In order to prevent stalling of the motor continues to run, it is necessary for detection of the current size of the frequency control. When the acceleration current is too large appropriate to slow down the acceleration rate. Deceleration as well. Combine the two is the stall function.
7, there is acceleration time and deceleration time can be given, respectively, models, and ramp time together given the aircraft, what's the point?
Acceleration and deceleration can be respectively given model, for quick acceleration, slow deceleration occasions, or for a small machine requires strict tact time given occasion is appropriate, but for the fan drive and other occasions, acceleration and deceleration time longer acceleration time and deceleration time can be given together.
8 What is regenerative braking?
If you lower the motor during operation command frequency, the motor becomes non-state synchronous generator running, while working as a stopper, which is called regenerative (electric) braking.