EM15 series frequency inverter lifting application

1.        EM12-G3-090 replaces the technicalrequirements for on-site control of the Yaskawa H1000 crane:

1)        When starting the frequency inverter, it is required to have a large low-frequencystarting torque and a smooth start.

2)        Start time is 3.0s (0-maximum frequency 100HZ), stop time is 5.0s (maximumfrequency 100HZ-0HZ)

3)        Requirements for shutdown: Accurate positioning and no hook slipping.

4)        The main lifting motor requires four speed controls, starting forward andreverse at 15HZ. The first section is 30HZ, the second section is 60HZ, and thethird section is 90HZ to improve on-site operation efficiency.

5)        The lifting site environment is harsh, requiring the frequency inverter tohave a wide voltage range, withstand harsh dust, high temperature, and othertests.

2.       Principles of on-site control

1)        When starting, DO1 outputs a collector signal to the small intermediaterelay, which then controls the motor's holding brake (opening the holding brakeduring operation and closing the holding brake when stopped)

2)        Braking control during the descent process of the main crane: Theequipment undergoes frequent forward and reverse rotation, acceleration anddeceleration, and braking operation during startup. Therefore, the frequency inverteroften switches between the 1.3 and 2.4 quadrants, especially during heavy loaddescent when the motor is dragged by a heavy object to maintain its speed inline with the rotating magnetic field and exceed the synchronous speed. At thistime, the motor changes from an electric state to a power generation state, andexcessive regenerative energy is fed back into the frequency inverter by thestator, This leads to an increase in the voltage of the inverter bus, and atthis time, the regenerative energy is consumed by the inverter P-externalbraking unit and resistor.

3)        The combination of DI1-D15 has a total of four speeds, and the on-siterequirement is to operate at a maximum of 90HZ to improve usage efficiency andensure that the vehicle does not slip.

3.       Field application wiring diagram：

4.       Set parameters.