Technical Specifications

FAQ

1. What is the rated output current of the 20BC085A0ANNANA0?

The 20BC085A0ANNANA0 has a rated output current of 85 A and belongs to the 400 V class of the PowerFlex 700 AC drive family. This rating is an important reference when matching the drive with a motor. During application selection, the motor nameplate current should be compared with the drive’s rated output capability while also considering starting torque, acceleration time, load inertia, and continuous operating load. If the motor requires a high current during startup or acceleration, the drive’s overload capability should also be evaluated. For industrial applications with continuously varying loads, drive selection should be based on the actual motor current and load characteristics rather than relying only on the motor’s kW rating.

2. What motor power rating is suitable for the 20BC085A0ANNANA0?

The 20BC085A0ANNANA0 has a normal-duty power rating of 45 kW and a heavy-duty power rating of 37 kW. The appropriate motor selection depends on the type of mechanical load and its operating conditions. Fans and pumps with relatively stable load characteristics can generally be evaluated using the normal-duty rating, while conveyors, compressors, extruders, lifting equipment, and other machinery requiring higher starting torque should be evaluated against the heavy-duty rating and current capacity. Motor rated current, voltage, frequency, speed, acceleration requirements, and duty cycle should all be checked. Even when the motor kW rating appears to match, excessive motor current can still cause overload or protective trips if the actual mechanical load exceeds the drive’s continuous capability.

3. What input power supply does the 20BC085A0ANNANA0 require?

The 20BC085A0ANNANA0 is designed for a 380–480 VAC three-phase input supply, with a nominal input voltage of 400 VAC and an input voltage tolerance of ±10%. Before installation, the incoming three-phase supply should be measured to confirm that it is within the allowable range and that there is no significant voltage imbalance between phases. The input circuit should also include suitable circuit protection, a disconnect device, an appropriate grounding system, and correctly sized power conductors. Poor power quality, excessive voltage fluctuations, phase imbalance, or loose connections can contribute to undervoltage, overvoltage, and other drive protection conditions. The complete incoming power circuit should therefore be inspected before initial energization.

4. Does the 20BC085A0ANNANA0 support motor feedback?

The standard 20BC085A0ANNANA0 configuration does not include motor feedback. It is intended for applications where open-loop motor control provides sufficient speed and torque performance. For equipment requiring highly accurate speed regulation, improved low-speed torque control, or closed-loop operation, the required drive configuration should be evaluated before installation. During commissioning, the motor voltage, current, frequency, and speed parameters should be entered correctly. For applications with significant load variation, engineers should also verify that the selected open-loop control method can provide the required operating accuracy and dynamic response.

5. Does the 20BC085A0ANNANA0 include a brake IGBT or internal braking resistor?

The standard 20BC085A0ANNANA0 configuration does not include a brake IGBT or an internal braking resistor. This should be considered when the drive is used for rapid deceleration, high-inertia loads, or applications with frequent stopping cycles. During deceleration, energy stored in the rotating mechanical system can be returned to the drive’s DC bus, causing the DC-bus voltage to increase. If the regenerated energy becomes excessive, the drive may produce a DC-bus overvoltage condition. For applications requiring rapid stopping, the braking requirements should be evaluated using motor power, load inertia, deceleration time, braking frequency, and operating cycle. An appropriate external braking or energy-management solution may be required depending on the application.

6. Can the 20BC085A0ANNANA0 be used with a PLC or DCS system?

Yes. The 20BC085A0ANNANA0 uses standard control with 24 V I/O and can be connected to PLC, DCS, HMI, and other industrial control equipment through its analog and digital I/O. The two analog inputs can be used for functions such as speed reference, while the analog outputs can provide operating information or actual-value feedback. The six digital inputs and three digital outputs can be assigned to functions including start, stop, direction, enable, running status, and fault indication. The standard configuration does not include a communication module, so applications requiring network-based data exchange should use an appropriate communication option. When controlled by a PLC or DCS, run permissives, start commands, stop conditions, fault reset logic, and machine interlocks should be checked carefully.

7. How should an overcurrent fault on the 20BC085A0ANNANA0 be diagnosed?

An overcurrent fault should be investigated systematically, beginning with the mechanical system and then moving to the motor, cables, parameters, and drive hardware. First, check the machine for mechanical blockage, excessive friction, bearing problems, coupling faults, or a sudden increase in load. If the mechanical system is normal, inspect the motor power cables and output terminals for phase-to-phase shorts, ground faults, damaged insulation, loose connections, or incorrect wiring. The motor parameters programmed into the drive should then be compared with the motor nameplate, particularly rated voltage, rated current, rated frequency, and rated speed. If the fault occurs mainly during startup or acceleration, check whether the acceleration time is too short, especially when the drive is operating a high-inertia load. If the external system is confirmed to be normal and the overcurrent fault continues, the drive’s output power section and related electronic components should be examined.

8. Why does the motor fail to start even though the 20BC085A0ANNANA0 is powered on?

If the drive is powered but the motor does not start, first check whether the drive has an active fault, alarm, inhibit, or external interlock condition. Next, verify the digital input signals and confirm that the start, stop, enable, and direction commands correspond correctly to the drive’s configured control parameters. If an analog speed reference is being used, measure the input signal and verify that the commanded frequency is not zero or limited by another parameter. The motor output wiring and power cables should also be inspected for an open circuit, incorrect connection, or other electrical problem. For systems controlled by a PLC or DCS, check the program logic for run permissives, emergency-stop conditions, machine interlocks, startup sequences, and fault-reset requirements. If all external conditions are correct, the drive parameters and internal hardware should be checked to determine whether the startup problem originates from the control system or the drive itself.