On U-shaped gantry crane electrical control system transformation

One with Doumen machine operating characteristics
1. Door at boot time, starting torque) 150% of the rated torque.
2. Grab drops when the motor is in regenerative power generation state, the energy supply side would like feedback.
3. Grab suddenly opened and in full dug by the load, the load will be drastically changed.
4. hoist gantry crane Electrical switching between braking and mechanical brake is not smooth finish, when there is the phenomenon of falling bucket.
5. Change bus bar luffing mechanism at the mouth at 35m and 9m at accurately stop at energy emergency stop at 8m.
6. Completed through a contact-type handle speed resistance switching, switching the motor current mutation greater impact.
Second, the transformation configuration
        According  gantry crane  operation pending points, and in order to meet the door high starting torque, low-speed full torque, fast rise time and brake torque sequence control function requirements, select ABB's ACS600 series inverter direct torque control for their match selection ABBAC80 (Advance controller) PLC, composed of more than one drive control system.
1. AC80 programmable controller
AC80 PLC is designed for transmission design, and its CPU is a 16-bit mode MC68360 processor, operating frequency 25MHz, responsible for overall system control logic, digital processing, data communications. By Electric Module Bus and I / 0 module communication, but also through DRIVEBUS transmission bus) control up to 12 transmission mechanism. User Function Chart Builde: Software (hereinafter referred to as FCB) is programmed for AC80, AC80 procedures including PC parts (part of the program) and the DB section (part of the database).
2.NDBU-85 Bus Adapter
Bus adapters with AC80 and through the cable between the drive mechanism composed of a star network structure, the user can DIP switch on the adapter set point in the transmission channel number on the adapter and the data transfer rate, transfer rate up to 4Mbit / s .
3.ACS600 thyristor supply unit (TSU)
Shown in Figure 2, two main thyristor power supply unit 6-pulse thyristor bridge components. The main bridge will be three-phase AC into DC, and then through the middle of the DC-link transmission of electric power to the drive section (inverter). Whenever you need the excess motor braking energy back to the grid when the anti-feedback bridge will convert DC into AC.
4.ACS600 inverter
ACS600 inverter AC motor stator flux is to directly control the motor torque. Shown in Figure 3,overhead gantry crane the stator flux and torque of the motor to realize the value of the calculated switching control power device, using a high-performance digital signal processor (DSP), can quickly realize the power device switching signal selection. User through the Drive window control panel software and CDP312 commissioning the inverter, parameter setting and fault tracking. According to the DC inverter control command AC80 converted into AC output to the motor, the motor brake grab drop during rectified into DC energy generated back to DC bus back to the power supply unit.
In order to ensure accurate positioning luffing distance, in the original cam limit based on the installation of the absolute encoder and photoelectric sensor switch, to ensure safe and stable operation of the institution.