Technical Specifications

FAQ

1. What are the rated current and power ratings of the 20BC125A3ANNANA0?

The 20BC125A3ANNANA0 has a rated output current of 125 A. It is rated for 55 kW under normal-duty operation and 45 kW under heavy-duty operation. When selecting the drive for a motor application, the motor’s rated current should be compared directly with the drive’s output current rating. The load profile should also be considered, particularly for applications involving high starting torque, frequent acceleration and deceleration, or continuous operation at high load. Proper sizing helps prevent nuisance overload trips and provides sufficient operating margin for changing process conditions.

2. What input power supply is required for the 20BC125A3ANNANA0?

The drive is designed for a three-phase 380–480 VAC supply, with 400 VAC as the nominal line voltage and 50 Hz as the specified mains frequency. The incoming power should remain within the permitted voltage tolerance and should have appropriate upstream protection. During installation, the power cables, disconnecting device, protective equipment, and grounding system should be selected according to the drive rating and the applicable electrical installation requirements. If the supply network experiences significant voltage fluctuations or electrical disturbances, the power quality should be evaluated before commissioning.

3. Does the 20BC125A3ANNANA0 have an internal braking resistor?

No. The 20BC125A3ANNANA0 is configured without an internal braking resistor and without a Brake IGBT. This is particularly important for applications with high-inertia loads or frequent rapid deceleration. When the motor decelerates, it can return regenerative energy to the drive’s DC bus, increasing the bus voltage. If the regenerated energy becomes excessive, a DC bus overvoltage condition can occur. Applications requiring short stopping times should therefore be evaluated carefully to determine whether an external braking or regenerative energy management solution is required.

4. How should an overcurrent fault be troubleshot on the 20BC125A3ANNANA0?

The first step is to identify when the overcurrent occurs. If it happens during startup or acceleration, check the acceleration time and determine whether the load requires excessive starting torque. If it occurs during normal operation, inspect the motor and driven machinery for mechanical binding, excessive friction, blocked components, or sudden load increases. Motor cables and terminals should also be checked for loose connections, incorrect phase wiring, or insulation problems. The programmed motor parameters should be compared with the motor nameplate data. Repeated overcurrent faults should be investigated at both the electrical and mechanical levels rather than simply increasing the protection limits.

5. Can the 20BC125A3ANNANA0 be controlled by a PLC?

Yes. The 20BC125A3ANNANA0 uses standard control with 24V I/O, allowing it to interface with a PLC through hardwired control signals. The six digital inputs can be assigned to functions such as start, stop, direction, enable, and fault reset, while the analog inputs can be used for speed or process references. Digital and analog outputs can provide operating status, fault information, and other feedback signals. During commissioning, the PLC commands and drive responses should be tested individually to confirm correct start/stop logic, speed reference scaling, fault handling, and feedback operation.

6. What is the maximum output frequency of the 20BC125A3ANNANA0?

The maximum output frequency specified for the 20BC125A3ANNANA0 is 400 Hz. However, the maximum permissible operating frequency for a particular motor should not be determined from the drive rating alone. The motor’s rated frequency, maximum mechanical speed, bearing limitations, cooling characteristics, and the speed limitations of the driven machine must also be considered. Operating an ordinary industrial motor at a frequency significantly above its rated value can increase mechanical stress and temperature. The maximum frequency parameter should therefore be configured according to the complete motor and machine requirements.

7. What can cause a DC bus overvoltage fault on the 20BC125A3ANNANA0?

A DC bus overvoltage fault is commonly related to regenerative energy during motor deceleration. High-inertia machinery, short deceleration times, and frequent braking cycles can cause substantial energy to return to the drive. Troubleshooting should begin by checking whether the fault occurs primarily during deceleration. If this is the case, the programmed deceleration time should be reviewed and compared with the mechanical characteristics of the load. Increasing the deceleration time may reduce regenerative energy. If the application requires rapid stopping, an appropriate external braking or regenerative energy solution may be necessary. The incoming AC voltage should also be checked for abnormal conditions.

8. What are the main commissioning precautions for the 20BC125A3ANNANA0?

Before commissioning, verify the incoming three-phase power, motor wiring, grounding, control wiring, and protective devices. The motor nameplate information should be entered accurately so that the drive can control the motor correctly. Initial testing should be performed at low speed to verify motor rotation direction and basic operation before applying the full mechanical load. Acceleration and deceleration settings should then be adjusted according to the actual machine characteristics. For PLC-controlled systems, start, stop, direction, speed reference, fault reset, and drive status signals should be tested individually. The EMC filter and common-mode choke configuration also makes proper grounding and separation of power and control wiring important for reliable operation.