Technical Specifications

FAQ

1. What are the rated output current and applicable power ratings of the 20BC125A0ANNANC0?

The 20BC125A0ANNANC0 has a rated output current of 125 A and is designed for three-phase industrial motor speed-control applications at approximately 400 VAC. Its normal-duty power rating is 55 kW, while the heavy-duty rating is 45 kW. When selecting the drive for an application, the motor nameplate current should be considered together with the load type, starting torque, acceleration requirements, operating cycle, and ambient conditions. For conveyors, pumps, fans, and other industrial machinery, the actual motor current should remain within the appropriate drive rating during continuous operation to prevent unnecessary overload protection trips.

2. What input power supply does the 20BC125A0ANNANC0 require?

The 20BC125A0ANNANC0 is designed for a three-phase 380–480 VAC input supply, with a nominal input voltage of 400 VAC and a 50 Hz input frequency. The actual supply should remain within the specified operating range, and the incoming three-phase power should have suitable quality for industrial variable-frequency drive operation. During installation, the upstream circuit breaker, fuses, power cables, and grounding system should be selected according to the application and installation requirements. If the facility has significant voltage fluctuations or electrical disturbances, additional evaluation may be necessary to ensure reliable long-term drive operation.

3. Does the 20BC125A0ANNANC0 include an internal braking resistor?

The 20BC125A0ANNANC0 does not include an internal braking resistor or a built-in Brake IGBT. This is particularly important for machinery with high inertia or applications requiring frequent rapid deceleration. During deceleration, the motor can operate as a generator and return energy to the drive’s DC bus, causing the DC bus voltage to rise. Excessive regenerative energy can result in a DC bus overvoltage fault. High-speed machinery, lifting equipment, and systems with frequent start-stop cycles should therefore be evaluated for an appropriate external braking or regenerative energy management solution.

4. How should an overcurrent fault on the 20BC125A0ANNANC0 be troubleshot?

When an overcurrent fault occurs, first determine whether it happens during startup, acceleration, steady-state operation, or deceleration. If the fault occurs mainly during startup or acceleration, check whether the acceleration time is too short and whether the mechanical load has excessive starting resistance. If the fault appears suddenly during normal operation, inspect the motor shaft, coupling, gearbox, bearings, and driven equipment for mechanical binding or abnormal resistance. The motor cables, terminals, and three-phase connections should also be checked. In addition, verify that the motor voltage, current, frequency, and speed parameters programmed into the drive match the actual motor nameplate data. Repeated overcurrent faults should be investigated at the mechanical and electrical levels rather than simply increasing the protection limits.

5. Can the 20BC125A0ANNANC0 be controlled by a PLC?

Yes. The 20BC125A0ANNANC0 provides standard control with 24V I/O, allowing it to interface with PLC control systems through digital and analog signals. Digital inputs can be assigned to functions such as start, stop, direction, and fault reset, while analog inputs can be used for speed references or process signals. Digital and analog outputs can provide operating status, fault information, or other feedback signals to the PLC. For systems requiring network-based control, an appropriate communication option can be used depending on the actual drive configuration. After installation, PLC commands, speed references, feedback signals, and fault-handling logic should be tested individually before placing the machine into full production operation.

6. What is the maximum output frequency of the 20BC125A0ANNANC0?

The 20BC125A0ANNANC0 can provide an output frequency of up to 420 Hz. However, this maximum frequency does not mean that every motor can safely operate at 420 Hz. The practical operating frequency must take into account the motor’s rated frequency, maximum permissible speed, bearing limitations, mechanical strength, and driven-load characteristics. Standard industrial motors should normally be operated within the speed limits specified by the motor manufacturer. Excessively high output frequency can increase motor mechanical stress and temperature and may cause the driven machinery to exceed its permissible speed. The maximum frequency should therefore be configured according to the complete motor and mechanical system.

7. What should be checked when a DC bus overvoltage fault occurs?

A DC bus overvoltage fault should be investigated particularly around the deceleration process and the regenerative characteristics of the load. When a machine decelerates rapidly, the motor can enter a generating condition and return significant energy to the drive’s DC bus. This can cause the DC bus voltage to increase beyond the allowable level. First determine whether the fault consistently occurs during deceleration, then check whether the programmed deceleration time is too short for the mechanical load. If extending the deceleration time reduces the fault frequency, regenerative energy is likely an important factor. The incoming AC supply should also be checked for abnormal voltage conditions. If the machine requires very short deceleration times, an appropriate braking or regenerative energy solution may be necessary.

8. How does the EMC configuration of the 20BC125A0ANNANC0 affect installation?

The specified configuration includes an EMC filter and common-mode choke, which can help reduce high-frequency electrical interference generated during drive operation. However, proper installation and cable routing remain essential for reliable system performance. Motor cables, control cables, and communication cables should be routed appropriately and separated where practical. Cable shielding and grounding should follow the requirements of the overall installation. In control cabinets containing PLCs, DCS equipment, sensors, and low-level analog signals, particular attention should be given to separating high-power motor cables from sensitive signal wiring. Proper EMC installation practices help reduce the risk of communication interference, unstable analog signals, and unwanted disturbances in the automation control system.