There are two types of inverter parking.
One form is called "free parking". As the name suggests, it is to quickly "power off" the motor, so that the motor can slide and park by its own inertial force (OFF2 parking);
The other form is called "brake parking". Then there are many ways to "brake parking". For example, OFF1 parking is to brake according to a certain slope deceleration, or OFF3 "emergency braking" parking (parking can only be done according to the extreme braking of the motor).
Second, the braking and parking methods are: DC braking (that is, the electricity is given into a certain direct current); power braking (energy dissipation with resistors); hybrid braking (DC braking + power braking); Regenerative braking (injecting generating current into the grid); Mechanical braking of the brake.
Parking is divided into ramp wave parking and free parking (fast parking is also ramp wave parking, only the ramp wave is steeper).
Braking also includes mechanical braking (such as brake brake), energy consumption braking (braking resistance, reverse braking, DC braking, etc.), feedback braking, etc. Whether braking is required is related to the motor operating state, and when the required parking time is less than the free parking time, braking is required to be used when the oblique wave is parked; There are times when braking is also required for the normal operation of the motor, such as when the hook is lowered.
In the drive system composed of power grid, inverter, motor and load, energy can be transmitted in both directions. When the motor is in the form of motor operation, the electric energy is transmitted from the power grid to the motor through the inverter, and is converted into mechanical energy to drive the load, so the load has kinetic energy or potential energy; When the load releases these energies in order to change the state of motion, the motor is driven by the load and enters the generator operation form, converting the mechanical energy into electrical energy and reacting to the front-stage inverter. This reactive energy, known as regenerative braking energy, can be reacted back to the grid by the inverter, perhaps in the braking resistor on the inverter's DC bus (energy braking).
When braking energy occurs
1. The process of lowering the heavy objects of the lifting equipment
2. Rapid deceleration process of large inertial load
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Operating procedures for Reynolds frequency converters
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1. What are the factory parameters of inverter rehabilitation?
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DCS and PLC and other control cabinets are inspected before leaving the factory
1. Test preparation:
1. It is necessary to remove all power switches before powering on the PLC control cabinet or IO cabinet.
2. It is necessary to completely cut off the connection between the PLC or DCS card and the outside. All front adapters are to be loosened and raised.
3. Check the power terminal wires and connectors.
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