The selection of the acceleration form and deceleration form of the inverter is also called the selection of acceleration and deceleration curves. Generally, there are several forms of inverter, such as linear, S-shaped, semi-S-shaped, etc., and the characteristics and uses of each form are as follows.
1. Linear form
This form causes the output frequency of the inverter to increase proportionally with the moment, and usually selects a linear curve, which can be adapted to most loads.
2. S-shaped form
In the beginning and end stages of acceleration and deceleration, the rise and fall of the frequency are slow, and the acceleration and deceleration process is S-shaped, with the intention of reducing the impact and oscillation of the mechanical system. The S-curve is suitable for constant torque loads.
3. Semi-S-shaped form
There are two methods in this form, one method is to accelerate and decelerate in a linear form at the beginning or end stage of acceleration and deceleration, about variable torque loads such as fans, etc., because the load is lighter at low speed, it can be accelerated in a linear form, and the acceleration process should be slowed down when the load is heavier at high speed to reduce the acceleration current. Another method is to accelerate and decelerate in the form of S at the beginning or end. It is often used for loads with high inertia.
When selecting the acceleration and deceleration forms of the inverter, the corresponding form can be selected according to the load torque characteristics. However, sometimes there are exceptions, such as when the engineer debugs the inverter of a boiler induced draft fan, he first selects the acceleration and deceleration form as a semi-S-shaped form, and trips as soon as the working inverter is started. The reason is that the induced draft fan rotates by itself because of the flue gas flow before starting, and reverses to become a negative load, so that the S form is selected to make the frequency speed slower when it is just started, and then the inverter tripping is avoided, of course, this is the method adopted for the inverter without the DC braking function.
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