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ABB PPD113 PPD103B101 3BHE020455R0101 3BHE023784R2 (CPU)

ABB PPD113 PPD103B101 3BHE020455R0101 3BHE023784R2 (CPU)

Classification of frequency converters

1. Divided by modulation method

(1) PAM (Pulse Amplitude Modulation): A control method that controls the amplitude of the output voltage in the rectifier circuit and the output frequency in the inverter circuit

(2) PWM (Pulse Width Modulation): A method of changing the equivalent output voltage by changing the width of the output pulse while keeping the DC voltage obtained from rectification unchanged.

PFEA112-65 tension control unit, PFEA112-65 3BSE050091R65, PFEA111 series optical disc, PFEA113-20, PFEA111-20,

2. Classified by working principle

(1) V/F control: Adjust the frequency and voltage of the frequency converter simultaneously

(2) Shift frequency control: an improved method for V/F control

(3) Vector control: a method of decomposing the stator current of an AC motor into magnetic field component current and torque component current, and controlling them separately

(4) Direct torque control: Using torque as the control variable, directly controlling torque is a new type of AC variable frequency speed control technology following vector control variable frequency speed control technology

3. Classified by purpose

(1) Universal frequency converter: can be used in conjunction with ordinary cage motors, can adapt to various types of loads with different properties, and has multiple selectable functions

(2) High performance dedicated frequency converter: For systems with high control requirements (elevators, fans, pumps, etc.), vector control is mostly used

(3) High frequency inverter: used in conjunction with high-speed motors

4. Divided by transformation stage

(1) AC-AC frequency converter: Directly converts fixed frequency AC power into continuously adjustable frequency and voltage AC power. No intermediate links, high efficiency, but a narrow range of continuously adjustable frequencies.

(2) AC-DC-AC frequency converter: First, convert alternating current into direct current, and then invert the alternating current into direct current through power electronic devices. The advantage is obvious, and it is currently widely adopted.

5. According to the energy storage methods of the DC link

(1) Current type: The intermediate link uses a large inductor as the energy storage link, and the reactive power will be buffered by this inductor. Regenerated electricity is directly fed back to the power grid.

(2) Voltage type: The intermediate link uses a large capacitor as the energy storage link, which will buffer the reactive power of the load. It is difficult to feed back non functional quantities to the AC power grid.

Selection principles of frequency converters

Considering the economy and safety of frequency converter operation, it is necessary to retain appropriate margins in frequency converter selection. To accurately select models, it is necessary to grasp the following principles:

1. Fully understand the performance requirements of the controlled object. Generally speaking, in situations where high requirements are placed on starting torque, speed regulation accuracy, and speed regulation range, vector frequency converters should be considered. Otherwise, universal frequency converters can be used.

2. Understanding the load characteristics, if it is a general application, it is necessary to determine whether the frequency converter is a G-type or P-type.

3. Understand the main nameplate parameters of the motor used: rated voltage and rated current.

4. The maximum current that may occur with a fixed load, using this current as the rated current of the selected frequency converter. If the current is less than the rated current of the adapted motor, select the corresponding frequency converter according to the adapted motor, considering cost factors. The following situations need to consider increasing the capacity by one level:

Long term high temperature and high load

The occurrence of catastrophic consequences due to XOR failure shutdown

The target load fluctuates greatly

The on-site power grid has been consistently low and the load is close to the rated value

Winding motor, synchronous motor or multipole motor (6 poles or more)

5. A thorough understanding of the optional accessories supported by each frequency converter is the foundation for correct selection. For the selection of accessories for frequency converters, the following principles must be followed:

(1) In the following situations, AC input reactors and DC reactors should be selected: for civil applications, such as hotel central air conditioning, motor power greater than 55KW; In situations where the quality of the power grid is poor or the capacity is too small; If not selected, it may cause interference, large three-phase current deviation, and frequent frequency converter failure

(2) AC output reactors should be used in the following situations: the frequency converter to motor line exceeds 100 meters (general principle)

(3) The following situations generally require the selection of braking units and braking resistors: increasing the load; Frequent rapid acceleration and deceleration; Large inertia (equipment that requires more than 1 minute for free parking and operates at a constant speed with a current smaller than the acceleration current)

Other models:

PFCL 301E-0.5 PFCL 301E-1.0 PFXC 141 PFTC 101X PFEA 112

PFEA 113 PFEA 111 PFEA 112 PFEA 113 PFEA 111-20

PFEA 112-20 PFEA 113-20 PFEA 111-65 PFEA 112-65 PFEA 113-65

PFEA 113-65.1PXV PFEA 113-65.2PXV PFEA 113-65.3PXV

PFEA 113-65.4PXV PFEA 113-65.1PXC PFEA 113-65.2PXC

PFEA 113-65.3PXC PFEA 113-65.4PXC PXUB 201 PXKB 201

ABB PPD113 PPD103B101 3BHE020455R0101 3BHE023784R2 (CPU)