Navigating the PowerFlex 400: A Selection Overview and Comparison

The PowerFlex 400 AC Drives are ideal for controlling both commercial and industrial fans and pumps. They are equipped with convenient features like purge input and damper control, offering a budget-friendly solution. With a variety of integrated features, it makes installation in mechanical systems simple. The PowerFlex 400 powers devices ranging from 3 to 350 Horse Power (HP) at 480 Volts Alternating Current and 3 to 50 HP at 240V AC, complying with the requirements of other contractors, OEMs, and end users worldwide.

Selection Overview

Enclosure Options

• NEMA/UL Type 1, Ingress Protection-20: Designed for conventional mounting in a 45°Celsius (113°Fahrenheit) ambient temperature outside or inside the control cabinet.
• Flange Type: Frame C ratings allow mounting heatsinks through the back of an enclosure of up to 15 kW (20 HP), 380–480V AC, and 7.5 kW (10 HP), 200–240V AC. This configuration effectively removes a substantial amount of heat inside a cabinet.
• Installation Flexibility: The UL Plenum rating makes direct installation within an air handling system possible.

Input/Output

The PowerFlex 400 AC Drive boasts an array of input and output options to suit various application needs. Its four fully programmable and three semi-programmable digital inputs provide flexibility in application setups. The drive’s opto-output and two programmable form-C relay outputs help it depict different motor and drive scenarios/conditions. The drive has two analog outputs for analog functions, and users can easily configure them via a DIP switch to provide either voltage (0–10V) or current (0–20 mA). With a resolution of 10 bits, these scalable outputs can be utilized for speed reference or the metering for additional drives. The drive has two analog inputs (a unipolar and a bipolar) that can be adjusted for voltage or current using a DIP switch. One of these inputs is isolated from the drive’s other I/Os to increase flexibility and safety. Users can install an auxiliary relay board to access six programmable form “A” relay outputs for increased functionality.

Communication

• It supports compatible Drive-Serial Interface communication modules and accessories, including EtherNet/IP protocol, Device Net, PROFIBUS-DP, LonWorks, and BACnet.
• The Metasys N2, P1-FLN, and embedded Modbus RTU protocols can be implemented without extra hardware or software and are parameter-selectable.
• Integrated RS-485 communication allows efficient programming from a personal computer and works in a multidrop network configuration.
• A Serial Converter module is provided to enable the integration of any controller with a DF1 port, ensuring communication between a range of systems.

Application Features

Incorporation with Fire and Life Protection Systems

It is simpler to connect the drive of this series to building fire and life protection systems because it consists of an input intended for integration with fire control panels or similar systems. When needed, drive control can be overridden due to this configuration. The drive has an integrated purge input feature that allows it to start at a programmable purge speed independent of the chosen start source. The important thing to remember is that the drive’s purge functionality never stops, even when it is stopped. In emergencies, a purge command ensures consistent and efficient operation by replacing a network or communication port stop command and a “SW Enable” instruction from the Terminal Block.

Fire/Freeze Status:

A “Function Loss” input on the PowerFlex 400 drive allows for integration with cooling coils or fire alarm systems. When this input is opened, the drive reacts by immediately coasting to a stop if it’s running and issuing a fault. Until this fault of the drive is reset and the alarm condition is addressed, it remains in this state to guarantee safety and proper operation.

PID Control Loop

A PID control loop integrated into the PowerFlex 400 maintains a process variable, such as “pressure” or “flow,” on a predefined set point. When the PID feedback from a reference is subtracted, the loop generates an error value. This loop responds to this error value by creating a frequency that aims to lower the error and eventually attempts to bring it down to zero based on the gains of the PID.

Damper Control:

This drive simplifies damper control and reduces the cost of external software and control hardware by integrating control logic operations within the drive. Such integration helps direct the connection of the system run command and any of the drive inputs. Relay outputs can be employed to energize the damper and open or close it as needed.  It is possible to wire a damper limit switch back to the drive will ensure that the drive can run at the specified speed safely and give important feedback that the damper is installed correctly.

Comparison

PowerFlex 400N

Thanks to its many integrated features, the PowerFlex 400N AC drive is an economical choice for speed control in constant and variable torque industrial applications. This drive offers a rating of 3.0 to 350 HP at 480V AC and is made with flexibility, space-saving, and user-friendliness to satisfy demands from OEMs, contractors, and end users worldwide.

• Flexibility in Mounting: With an IP20 rating, the drive can be mounted conventionally inside and outside a control cabinet, even in environments as cold as 45°C (113°F).
• Digital Inputs: Four fully programmable and three semi-programmable digital inputs provide flexibility for various applications.
• Relay Outputs: One opto and two programmable form C relay outputs indicate different motor or drive conditions.
• Analog Outputs: Either used for metering or as a speed reference for additional drives, the two scalable 10-bit analog outputs have the ability to switch between voltage (0–10V) and current (0–20 mA).
• Analog Inputs: Two switchable unipolar and bipolar analog inputs are isolated from the other drive I/O that can be used to select voltage or current.
• Auxiliary relay outputs: six programmable forms ‘A’ Relay outputs can be accessed through the user-installed Board for Auxiliary Relays.

Communication capabilities

• Communication Modules: Supported Drive Serial Interface (DSI) communication modules include DeviceNet, EtherNet/IP, PROFIBUS DP, LonWorks, BACnet, and compatible accessories.
• Embedded Protocols: Metasys N2, P1-FLN, and Modbus RTU protocols can be implemented with no extra hardware or software and are parameter-selectable.
• RS485 Communications: Integral RS485 communications support programming from a PC and multi-drop network configuration. A serial converter module allows connection to any controller with a DF1 port.

PowerFlex 400P

The PowerFlex 400P offers various specifications designed to meet diverse industrial needs. The voltage tolerance is maintained at ±10% for both 200-240V and 380-480V ranges, while frequency tolerance spans from 48 to 63 Hz. It supports three-phase input for full rating and single-phase operation with 35% rated current. The drive ensures efficient operation with a power factor of 0.98 across its speed range. Maximum short circuit ratings vary depending on frame size, reaching up to 200,000 Amps Symmetrical for Frames D-H. The transistor type is Isolated Gate Bipolar (IGBT), ensuring reliable performance.

• Incorporates an internal DC Bus Choke and AC Line Reactor, bolstering operational stability.
• Makes use of Volts/Hertz and Sinusoidal PWM.
• Carrier frequencies span from 2 to 10 kHz for specific frame sizes.
• Ensures ±1% precision of base speed across a broad speed spectrum.
• Allows programming of output frequency of up to 320 Hz.
• Offers a range of stop modes to provide operational versatility, including the S-Curve, Ramp, DC-Brake, Coast, and Ramp-to-Hold modes.

Communication capabilities

• Standard features include P1-Floor Level Network (FLN) support, Drive-Serial Interface (DSI), Metasys N2, and Modbus RTU.
• Enhances compatibility with various communication networks with optional protocols like EtherNet/IP, BACnet, DeviceNet, PROFIBUS DP, ControlNet, and LonWorks.

Conclusion

In conclusion, these PowerFlex 400 Alternating Current drives offer robust solutions for controlling commercial and industrial fans and pumps. They meet diverse needs globally, featuring purge and damper input, standardized designs, and various power ratings. The PowerFlex 400N prioritizes flexibility and ease of use, making it suitable for general industrial applications, while the PowerFlex 400P provides versatile specifications and communication capabilities for diverse industrial needs. With comprehensive features like mounting flexibility, digital/analog inputs/outputs, and application-specific functions, the PowerFlex 400 ensures efficient and reliable speed control in various environments.