Pressure range
Send the normal working pressure and the control setpoint used by the compressor system.
Air Compressor Drive
FU9000C Variable Frequency Drive for Air Compressor Systems
FU9000C is the compressor-oriented series in the UFELE VFD range. It allows motor speed to follow actual air demand and supports both induction and synchronous motors, with industrial communication available for controller integration.
Power0.75–630 kW
Voltage classes380 / 480 V
CommunicationModbus RTU standard
Air Demand
The Compressor Does Not See the Same Demand All Day
Compressed-air demand rises and falls with production. FU9000C is intended to let motor speed respond to that demand instead of treating the compressor as a fixed-speed motor application.
For selection, the motor plate is only one part of the job. We also need the working pressure range, compressor controller arrangement and motor type.
Pressure Feedback
Motor Speed Follows the Air System, Not a Fixed Number
Compressor control starts with the pressure the system needs to maintain. The feedback signal tells the controller how the air system is behaving, while FU9000C changes motor speed within the selected control strategy.
Air demand pattern
Tell us whether demand is steady, changes by shift, or moves quickly with production equipment.
Controller interface
The drive has to fit the compressor’s existing control logic, not operate as an isolated motor controller.
Motor Type
Induction and Synchronous Motor Support
FU9000C supports induction and synchronous motors. That makes the motor type an early selection question, especially on an existing compressor where the buyer may be replacing only the drive and keeping the original motor and controller.
| Motor information | Why we need it |
|---|---|
| Motor type | Separates induction and synchronous motor requirements before the drive is selected. |
| Rated power and current | Used for drive sizing and current margin. |
| Rated voltage and frequency | Checks compatibility with the 380 / 480 V class and motor operation. |
| Rated speed | Useful when comparing the existing compressor setup with the replacement configuration. |
Communication
The Drive Has to Talk to the Compressor Controller
FU9000C includes Modbus RTU as standard. PROFIBUS-DP and PROFINET can be added through optional modules on selected configurations. Choose the communication requirement before the order so the drive arrives ready for the intended control architecture.
Modbus RTU
Standard communication for controller integration on the FU9000C series.
PROFIBUS-DP
Available through an optional module on selected configurations.
PROFINET
Available through an optional module on selected configurations.
System Integration
One Compressor or a Multi-Motor System
FU9000C is positioned for compressor systems that may include more than one motor. That makes the surrounding controller, operating sequence and communication plan important parts of the project data.
Single compressor
Start with the compressor motor, pressure range and controller interface.
Multi-motor system
Where several motors operate in one compressor system, send the control sequence and identify which motor each drive will control.
Existing controller
For retrofit work, keep the original controller in the conversation from the beginning. A drive replacement should not ignore how commands and feedback are exchanged.
Retrofit
Replacing an Existing Compressor Drive
If the old system is still running, note the normal operating pressure and any recurring alarms before shutdown. That gives us useful context when comparing the replacement drive with the existing controller setup.
Photograph the old drive and cabinet
Show the nameplate, terminals and available mounting space.
Send the compressor motor plate
We need motor type, current, voltage, power and speed.
Identify the compressor controller
Tell us how it sends run, speed and pressure-related commands to the drive.
Confirm communication
Note whether the system uses Modbus RTU, PROFIBUS-DP, PROFINET or another interface.
Send the working pressure range
This keeps the selection tied to the real compressor system rather than to motor kW alone.
Retrofit Pitfalls
The Motor Is Only One Part of an Air-Compressor Retrofit
Replacing an air-compressor drive is rarely just a matter of matching kW. The old controller may already manage pressure, alarms, start/stop logic and communication. The new drive has to fit that control arrangement as well as the motor.
Controller commands
Identify where run, stop and speed commands come from. A controller photo and terminal diagram are useful when the original drive is being replaced.
Pressure feedback
Tell us the normal pressure range and where the pressure signal is handled. The drive may work with the compressor controller rather than directly with the sensor.
Motor type
Induction and synchronous motors are both within the FU9000C series scope. The motor type must be identified before parameter setup or drive selection.
Communication Choice
Choose the Network Before the Cabinet Is Finished
Modbus RTU is standard on FU9000C. PROFIBUS-DP and PROFINET are optional on selected configurations. If the compressor controller depends on one of these networks, that requirement should be part of the order from the beginning.
Leaving the network decision until commissioning can create avoidable rework. For a retrofit, send the controller model and a photo of the existing communication connection. For a new compressor package, include the preferred protocol in the electrical design notes.
Series Choice
Why We Keep the Compressor Drive Separate from General Machinery
An air compressor is not only a motor load. The drive works inside a larger package with a compressor controller, pressure feedback, protection logic and operating sequence. FU9000C is kept as a separate series so those system-level questions are part of the selection from the beginning.
That matters most in replacement work. A drive can match the motor electrically and still be a poor replacement if the communication, controller commands or motor type do not match the original compressor system.
Motor match
Power, current, voltage and motor type come from the nameplate.
Controller match
Run commands, speed reference and alarm handling need to fit the compressor controller.
Network match
Modbus RTU is standard, while optional network modules should be chosen before shipment when the project needs them.
Factory Check
Testing Before the Compressor Drive Ships
FU9000C orders are checked against the approved model and order file before packing. Electrical and functional verification is part of the UFELE quality-control workflow. Communication and motor-type requirements should be written clearly into the order file when they affect the configuration.
Technical documents:
Use the current FU9000C datasheet and manual for model-specific current, terminals, communication modules and setup details.
Use the current FU9000C datasheet and manual for model-specific current, terminals, communication modules and setup details.
FAQ
FU9000C Questions
What is FU9000C used for?
FU9000C is UFELE’s air-compressor VFD series. It is designed to adjust motor speed around actual air demand rather than using only fixed-speed operation.
What is the FU9000C power range?
FU9000C covers 0.75 to 630 kW (1–850 HP) in 380 V and 480 V classes.
Which motor types can FU9000C support?
The series supports induction and synchronous motors. The exact motor data should be checked before the model is selected.
Which communication options are available?
Modbus RTU is standard. PROFIBUS-DP and PROFINET are available through optional modules on selected configurations.
What should I send for an existing compressor retrofit?
Send the motor nameplate, old drive photo, compressor controller information, pressure range, communication requirement and cabinet photos.
FU9000C Selection
Send the Motor, Pressure Range and Controller Information
Those three items usually tell us how the compressor drive needs to fit the system.