Technical Specifications

FAQ

1. What are the main electrical specifications of the 20BC170A3ANNANC0?

The 20BC170A3ANNANC0 is a three-phase PowerFlex 700 AC drive designed for industrial motor speed and torque control. It is suitable for 380–480 V AC power systems, with a nominal input voltage of 400 V AC and a rated output current of 170 A. The drive has a normal-duty power rating of 90 kW and a heavy-duty power rating of 75 kW. The maximum output frequency can reach 420 Hz when the appropriate control mode and motor configuration are used. For proper selection, the motor rated current should be considered together with starting torque, load inertia, acceleration and deceleration requirements, overload conditions, and the actual operating cycle. Selecting the drive only according to motor power may result in insufficient capacity for demanding applications.

2. What motor control modes are supported by the 20BC170A3ANNANC0?

The 20BC170A3ANNANC0 supports sensorless vector control, V/Hz control, and vector control, allowing it to be configured for different industrial motor-control requirements. Sensorless vector control provides improved speed and torque regulation without requiring an encoder or other motor feedback device, making it suitable for many general-purpose and demanding industrial applications. During commissioning, the motor nameplate information should be entered accurately, including rated voltage, rated current, rated frequency, and rated speed. Appropriate motor tuning should also be performed when required by the application. Incorrect motor parameters can cause unstable speed, excessive output current, insufficient low-speed torque, poor acceleration response, or repeated drive protection events.

3. Does the 20BC170A3ANNANC0 include an internal braking resistor or Brake IGBT?

The 20BC170A3ANNANC0 does not include an internal braking resistor or Brake IGBT. This configuration should therefore be evaluated carefully when it is used with high-inertia loads or equipment requiring rapid and repeated deceleration. During braking, energy from the rotating motor and mechanical load can be regenerated into the drive’s DC bus, causing the DC-bus voltage to rise. If the regenerated energy exceeds the allowable level, a DC-bus overvoltage fault can occur. Applications such as hoists, winding machines, centrifuges, large conveyors, and other high-inertia machinery may require an external braking solution. The required solution should be determined according to motor speed, load inertia, deceleration time, stopping frequency, and the amount of regenerative energy generated during operation.

4. What I/O configuration is available on the 20BC170A3ANNANC0?

The drive provides six digital inputs, three digital outputs, two analog inputs, and two analog outputs, with 24 V DC control I/O. The digital inputs can be assigned to functions such as start, stop, enable, forward/reverse operation, fault reset, and preset-speed selection. Analog inputs can be used for speed references or process-control signals, while analog outputs can provide configured operating feedback to a PLC, HMI, or other control equipment. Before commissioning, the I/O configuration should be compared with the electrical drawings and PLC program. Each input and output should be tested individually to confirm correct wiring, parameter assignment, signal response, and control logic. This is especially important when the drive is integrated into an automated production system where incorrect I/O configuration could cause unintended motor operation.

5. What communication capabilities are available on the 20BC170A3ANNANC0?

The 20BC170A3ANNANC0 includes ControlNet coaxial communication capability and can be integrated into compatible industrial control networks. The PowerFlex 700 platform can also support DeviceNet, EtherNet/IP, PROFIBUS, CAN, Modbus, TCP/IP, and LON through the appropriate communication options. Network communication can be used to exchange start and stop commands, speed references, operating status, alarms, and fault information between the drive and a PLC or supervisory control system. During commissioning, the network address, communication settings, command source, speed-reference source, and communication timeout behavior should be configured correctly. Communication-loss behavior should also be tested to ensure that the drive responds according to the machine’s safety and control requirements.

6. How should an overcurrent or overload fault on the 20BC170A3ANNANC0 be diagnosed?

Troubleshooting should begin by identifying when the fault occurs. If an overcurrent fault occurs during startup or acceleration, check the mechanical system for blockage, excessive friction, bearing problems, excessive inertia, or an unexpectedly high load. The acceleration time should also be reviewed because an excessively short acceleration period can cause a significant increase in motor current. The motor power cables and terminals should then be inspected for loose connections, incorrect wiring, insulation damage, or phase-related problems. The motor parameters programmed into the drive should be compared with the actual motor nameplate data. If the fault occurs mainly during deceleration, the deceleration time and regenerative energy should be investigated. For overload faults during normal operation, the mechanical load should be checked for unexpected increases. Reviewing the fault history together with output current, operating frequency, and machine conditions provides a more reliable diagnosis than repeatedly resetting the drive.

7. How should acceleration and deceleration times be configured on the 20BC170A3ANNANC0?

The 20BC170A3ANNANC0 provides independently programmable acceleration and deceleration times, allowing the drive to be adapted to different machine inertia and process requirements. The available time range can be configured from 0 to 3600 seconds. Acceleration should not be set unnecessarily short because the motor may require a high amount of current to rapidly establish torque, increasing the possibility of current limiting or overload protection. Deceleration requires additional consideration because high-inertia loads can return substantial regenerative energy to the DC bus when stopped too quickly. For initial commissioning, conservative acceleration and deceleration settings should normally be used during unloaded or lightly loaded testing. The times can then be optimized based on motor current, stopping performance, mechanical stress, and the behavior of the DC bus. If frequent rapid stopping is required, an external braking solution may also need to be evaluated.

8. What environmental conditions should be considered when installing the 20BC170A3ANNANC0?

The 20BC170A3ANNANC0 is specified for an operating temperature range of 0–50 °C and a relative humidity range of 5–95% without condensation. The standard maximum installation altitude is 1000 m without derating. The drive uses an IP20 / NEMA/UL Type 1 enclosure, so it should be installed inside a suitable control cabinet or protected industrial environment rather than being directly exposed to water, excessive moisture, corrosive gases, or conductive dust. Proper ventilation and heat dissipation are important, particularly when the drive operates close to its rated current for extended periods. The control cabinet should provide sufficient airflow and should prevent nearby heat-generating equipment from causing excessive ambient temperature. For installations at higher altitudes, elevated temperatures, or locations with restricted ventilation, the thermal load should be evaluated and appropriate derating applied when necessary. Regular inspection of cooling paths, power terminals, control wiring, and fault history can also help maintain reliable long-term operation.