Technical Specifications

FAQ

1. What are the main electrical specifications of the 20BC170A3ANNANA0?

The 20BC170A3ANNANA0 is a three-phase PowerFlex 700 AC drive designed for industrial variable-speed motor applications. It is intended for 380–480 V AC systems, with a nominal 400 V AC input and a continuous normal-duty output current rating of 170 A. The normal-duty power rating is approximately 90 kW, while the heavy-duty rating is approximately 75 kW. Under heavy-duty conditions, the drive can provide 210 A for up to one minute and 280 A for up to three seconds. The actual selection should be based on motor rated current and the machine’s load profile, including starting torque, acceleration requirements, inertia, operating cycle, and overload conditions.

2. What motor control modes are available on the 20BC170A3ANNANA0?

The 20BC170A3ANNANA0 supports sensorless vector control, standard V/Hz control, and vector control with full tuning capability. Sensorless vector control can provide substantially better speed and torque regulation than basic V/Hz control without requiring a motor feedback device. In vector-control mode without feedback, speed regulation can reach approximately 0.1% of base speed across a 120:1 speed range under suitable operating conditions. During commissioning, the motor nameplate information should be entered accurately, including rated voltage, current, frequency, and speed. Proper motor tuning is also important for achieving stable operation. Incorrect motor data can result in excessive current, poor low-speed performance, speed fluctuations, or repeated drive protection events.

3. Does the 20BC170A3ANNANA0 include an internal braking resistor or Brake IGBT?

No. The 20BC170A3ANNANA0 does not include an internal braking resistor or Brake IGBT. This is particularly important for applications with large rotating inertia, rapid deceleration, or frequent stopping cycles. During deceleration, energy from the motor and connected mechanical load can flow back into the DC bus, increasing DC-bus voltage. If the regenerated energy exceeds the drive’s capability, a DC-bus overvoltage condition may occur. Applications such as hoists, centrifuges, winding equipment, large conveyors, and high-inertia machinery should therefore be evaluated carefully. The required braking solution should be determined from motor speed, load inertia, deceleration time, stopping frequency, and regenerative energy. An external braking solution may be required where rapid or repeated deceleration is necessary.

4. What I/O functions are available on the 20BC170A3ANNANA0?

The drive provides six digital inputs, three digital outputs, two analog inputs, and two analog outputs. The standard control configuration uses 24 V AC/DC I/O, allowing the drive to interface with PLCs, sensors, switches, relays, interlocks, and other industrial control equipment. Digital inputs can be configured for start, stop, enable, direction, fault reset, preset-speed selection, and similar control functions. Analog inputs can be used for speed references or process signals, while analog outputs can provide configured feedback information to a PLC or monitoring system. Before commissioning, every I/O point should be checked against the electrical drawings and control logic. Testing each signal individually helps confirm correct wiring, parameter assignment, polarity, and PLC operation.

5. What communication protocols can be used with the 20BC170A3ANNANA0?

The PowerFlex 700 platform supports several industrial communication technologies, including DeviceNet, EtherNet/IP, PROFIBUS, CAN, Modbus, TCP/IP, and LON when the appropriate communication options are installed. The 20BC170A3ANNANA0 configuration does not contain an internal communication module, so an external or compatible communication option may be required for network integration. When connecting the drive to a PLC or SCADA system, the network address, communication parameters, command source, speed-reference source, and timeout behavior should be configured correctly. Communication commissioning should include testing start and stop commands, speed references, drive status, alarms, and fault information. The drive’s response to a communication interruption should also be verified so that the machine moves to the intended safe operating state.

6. How should overcurrent and overload faults on the 20BC170A3ANNANA0 be diagnosed?

The first step is to identify exactly when the fault occurs. If an overcurrent fault appears during starting or acceleration, inspect the mechanical system for excessive friction, blockage, bearing problems, excessive inertia, or an unusually high starting load. The programmed acceleration time should also be checked because an excessively short acceleration period can cause a significant current demand. Motor cables and terminals should be inspected for loose connections, incorrect wiring, insulation damage, or phase faults. The motor nameplate parameters stored in the drive should be compared with the actual motor data. If an overload occurs during normal operation, check whether the mechanical load has increased beyond its expected level. The fault history, output current, operating frequency, motor temperature, and machine condition should be reviewed together rather than simply resetting the drive repeatedly.

7. How should acceleration and deceleration parameters be configured on the 20BC170A3ANNANA0?

The 20BC170A3ANNANA0 provides two independently programmable acceleration times and two independently programmable deceleration times. Each time can be configured from 0 to 3600 seconds in 0.1-second increments, allowing the drive to accommodate a wide range of machine inertia and process requirements. The drive also supports several programmable stop modes, including coast, DC braking, fast braking, RA-to-hold, and S-curve-related stopping behavior. Acceleration should not normally be set unnecessarily short because this can increase motor current and trigger current limiting or overload protection. Deceleration requires particular attention on high-inertia loads because a short deceleration time can generate substantial regenerative energy. The initial settings should be conservative, followed by controlled optimization based on motor current, stopping performance, mechanical stress, and DC-bus behavior.

8. What environmental conditions should be considered when installing the 20BC170A3ANNANA0?

The 20BC170A3ANNANA0 is specified for operation from 0 to 50 °C at 400 V AC, with 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 in a suitable control cabinet or protected industrial environment rather than exposed directly to water, excessive moisture, corrosive gases, or conductive dust. Adequate airflow around the drive is important because the unit generates heat during normal operation, particularly when operating close to its rated current. The control cabinet should provide sufficient ventilation and should prevent other heat-generating equipment from causing excessive ambient temperature. For installations at higher altitudes or in high-temperature environments, the thermal load should be evaluated and appropriate derating applied where required.