Technical Specifications

FAQ

1. What is the rated output current of the 20BC140A0ANNAND0?

The 20BC140A0ANNAND0 has a rated output current of 140 A. It is designed for three-phase AC motor control and provides a normal-duty power rating of 75 kW and a heavy-duty power rating of 55 kW. When selecting the drive, the motor nameplate current should be compared directly with the drive’s output current rating. The actual application duty should also be considered, including starting torque, acceleration requirements, load fluctuations, and continuous operating conditions. Correct sizing provides sufficient operating margin and helps reduce unnecessary overload trips.

2. What type of input power supply does the 20BC140A0ANNAND0 use?

The drive is designed for a three-phase 380–480 VAC input supply, with 400 VAC as the nominal input voltage and 50 Hz as the mains frequency. The input supply should remain within the specified voltage tolerance and should be connected through appropriately rated protection equipment. Power cables, circuit breakers or fuses, disconnecting equipment, and grounding conductors should be selected according to the actual installation. In industrial environments with unstable power or significant voltage fluctuations, the incoming supply should be checked before commissioning to ensure reliable operation.

3. Does the 20BC140A0ANNAND0 include a built-in braking resistor?

No. The 20BC140A0ANNAND0 is configured without a Brake IGBT and without an internal braking resistor. This should be considered when the drive is used with high-inertia loads or machinery requiring frequent and rapid deceleration. During braking, the motor may return regenerative energy to the drive’s DC bus, causing the DC bus voltage to rise. If the regenerative energy is excessive, the drive can experience a DC bus overvoltage condition. Applications requiring short stopping times should therefore be evaluated for an external braking or regenerative energy management solution.

4. How should an overcurrent fault be diagnosed on the 20BC140A0ANNAND0?

Start by identifying the operating condition in which the overcurrent occurs. If the fault appears during startup or acceleration, check whether the acceleration time is too short or whether the mechanical load requires excessive starting torque. If the fault occurs during normal operation, inspect the motor, coupling, gearbox, bearings, and driven machinery for mechanical binding, excessive friction, blockage, or an unexpected increase in load. Motor cables and terminals should also be inspected for loose connections or incorrect wiring. The programmed motor voltage, current, frequency, and speed parameters should be compared with the motor nameplate. Repeated overcurrent faults should be investigated systematically instead of simply increasing current protection limits.

5. Can the 20BC140A0ANNAND0 be integrated with a PLC control system?

Yes. The drive provides 120V I/O for hardwired control integration with an industrial PLC or control system. 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 where applicable. Output signals can provide operating or fault status to the control system. For network-based control, compatible communication options can be installed according to the system architecture. During commissioning, each control command and feedback signal should be tested individually to confirm correct operation and fault-handling logic.

6. What is the maximum output frequency of the 20BC140A0ANNAND0?

The maximum output frequency is 420 Hz. However, the drive’s maximum frequency should not automatically be used as the operating limit for the connected motor. The motor’s rated frequency, maximum permissible speed, bearing limitations, cooling conditions, and the mechanical speed limitations of the driven equipment must all be considered. Operating a motor significantly above its rated frequency may increase mechanical stress and temperature. The maximum frequency should therefore be configured according to the motor manufacturer’s specifications and the requirements of the complete mechanical system.

7. What can cause a DC bus overvoltage fault on the 20BC140A0ANNAND0?

A DC bus overvoltage fault is commonly associated with regenerative energy during motor deceleration. High-inertia loads, short deceleration times, and frequent braking cycles can return significant energy to the DC bus. If the fault occurs mainly while the motor is slowing down, check the programmed deceleration time and compare it with the inertia and operating requirements of the machine. Increasing the deceleration time can reduce regenerative energy in many applications. If rapid stopping is essential, an external braking or regenerative energy solution may be required. The incoming AC voltage should also be checked to rule out abnormal supply conditions.

8. What should be checked before commissioning the 20BC140A0ANNAND0?

Before commissioning, verify the three-phase input power, motor wiring, grounding, control wiring, and upstream protective equipment. The motor nameplate data should be entered accurately so that the vector-control system can operate correctly with the connected motor. Initial startup should be performed at low speed to confirm motor rotation direction and basic drive response. Acceleration, deceleration, minimum frequency, maximum frequency, and other operating parameters should then be adjusted according to the machine requirements. For PLC-controlled systems, start, stop, direction, speed reference, fault reset, and status feedback should be tested individually. Proper grounding and suitable separation between power and control wiring are also important for minimizing electrical interference and maintaining stable operation.