Technical Specifications

FAQ

1. What are the rated output current and power ratings of the 20BC140A0ANNANC0?

The 20BC140A0ANNANC0 has a rated output current of 140 A, with a normal-duty power rating of 75 kW and a heavy-duty rating of 55 kW. It is intended for high-power three-phase AC motor speed-control applications. During drive selection, the motor nameplate current should be compared with the drive’s rated output current, while the starting torque, load variation, acceleration time, and operating cycle should also be evaluated. For machinery operating continuously at high load or requiring substantial starting torque, sizing should be based on the actual operating duty to reduce the possibility of overload protection trips.

2. What input power supply does the 20BC140A0ANNANC0 require?

The 20BC140A0ANNANC0 is designed for a three-phase 380–480 VAC input supply, with a nominal input voltage of 400 VAC and an input frequency of 50 Hz. The incoming supply should remain within the permitted operating range and should be protected using appropriately rated circuit breakers, fuses, power cables, and grounding equipment. If the installation is located in an industrial facility with significant voltage fluctuations or poor power quality, the incoming supply should be checked before commissioning. Correct power configuration is important for both reliable startup and long-term drive operation.

3. Does the 20BC140A0ANNANC0 include an internal braking resistor?

No. The 20BC140A0ANNANC0 does not include an internal braking resistor and does not have a built-in Brake IGBT. Applications involving high-inertia machinery, rapid deceleration, or frequent start-stop cycles require particular attention to regenerative energy. During deceleration, the motor can operate as a generator and return energy to the drive’s DC bus, causing the bus voltage to increase. If the regenerated energy exceeds the available energy-handling capability, a DC bus overvoltage fault can occur. Applications requiring rapid braking should therefore be evaluated for an appropriate external braking or regenerative energy management solution.

4. How should an overcurrent fault on the 20BC140A0ANNANC0 be diagnosed?

First determine at which stage of operation the overcurrent fault occurs. If it happens during startup or acceleration, check whether the acceleration time is too short or whether the machine requires excessive starting torque. If it occurs during steady-state operation, inspect the motor, coupling, gearbox, bearings, and driven machinery for mechanical binding, abnormal friction, or a sudden increase in load. The motor cables and terminals should also be checked for loose connections and incorrect phase wiring. In addition, verify that the motor voltage, current, frequency, and speed parameters programmed into the drive match the motor nameplate. Recurring overcurrent faults should be investigated at the mechanical and electrical levels rather than simply increasing the protection settings.

5. Can the 20BC140A0ANNANC0 be controlled by a PLC?

Yes. The drive provides 24V I/O and can be integrated with a PLC through hardwired control signals. Digital inputs can be assigned to functions such as start, stop, direction, enable, and fault reset, while analog inputs can be used for speed references or process signals. Digital and analog outputs can provide operating status, fault status, and other feedback signals to the PLC. If network communication is required, the appropriate communication option must be selected according to the control architecture. After connecting the PLC and drive, each command, speed reference, status signal, and fault-handling function should be tested individually.

6. What is the maximum output frequency of the 20BC140A0ANNANC0?

The maximum output frequency of the 20BC140A0ANNANC0 is 420 Hz. However, this does not mean that the connected motor should automatically be operated at 420 Hz. The practical operating frequency must be determined by considering the motor’s rated frequency, maximum permissible speed, bearing limitations, cooling characteristics, and the maximum speed allowed by the driven machinery. Continuous operation above the motor’s rated frequency can increase mechanical stress and temperature. The maximum frequency should therefore be configured according to the operating limits of the complete motor and mechanical system.

7. What causes a DC bus overvoltage fault on the 20BC140A0ANNANC0?

DC bus overvoltage is commonly associated with regenerative energy generated during motor deceleration. High-inertia loads, short deceleration times, and frequent start-stop operation can cause significant energy to flow back into the drive’s DC bus. Troubleshooting should first determine whether the fault occurs mainly during deceleration. If it does, check whether the programmed deceleration time is too short and consider increasing it according to the machine’s operating requirements. If the process requires rapid stopping, an external braking or regenerative energy management solution may be necessary. The incoming AC supply should also be checked to make sure abnormal input voltage is not contributing to the fault.

8. What should be checked before commissioning the 20BC140A0ANNANC0?

Before commissioning, verify the three-phase input power, motor connections, grounding system, control wiring, and upstream protective devices. Because this drive uses vector control, accurate motor nameplate information should be entered so that the control algorithm can properly regulate the motor. During the initial startup, operate the motor at low speed and confirm the correct rotation direction and basic operating condition before gradually increasing speed and load. Acceleration and deceleration settings should then be adjusted according to the mechanical characteristics of the machine. For PLC-controlled applications, start, stop, direction, speed reference, fault reset, and drive status feedback should be tested individually. Proper grounding and separation of power and control wiring are also important for reducing electromagnetic interference.