EMERSON FX-340 Unidrive SP Servo Drives

The Emerson FX-340, also cataloged as the FX340 Servo Drive, operates as a dedicated hardware component for closed-loop speed and torque control execution within Unidrive SP motion control systems.

Hardware Specifications

V/Hz and Field-Oriented Vector Control

The drive platform utilizes field-oriented vector control algorithms and open-loop V/Hz control profiles to drive AC induction and permanent magnet synchronous motors. High-speed DSP processing enables dynamic current loop response, output harmonic distortion suppression, and accurate torque regulation across varying load profiles. Internal thermal heat sink dissipation profiles prevent junction overheating during high continuous current output spikes up to 104 A.

Frequently Asked Questions

Q: How is drive parameterization performed if no local keypad is installed on the front panel?

A: Parameterization can be executed via an external pluggable SM-Keypad unit, a CT-Comms cable, or through networked industrial communications using system configuration software.

Q: What are the current rating differences between Normal Duty and Heavy Duty operational profiles?

A: Normal Duty supports up to 104 A maximum continuous output current (40 HP), whereas Heavy Duty operation supports up to 80 A continuous output current (30 HP) for higher overload requirements.

Q: What input power source voltage is required for the FX-340 drive?

A: The drive operates from a nominal 230 VAC power line input.

Field Installation Guidelines

1. Mount the drive vertically inside a NEMA/IP rated cabinet to ensure optimal airflow across the rear thermal heat sink.
2. Connect the 230 VAC main supply and motor leads using properly sized wire gauges compliant with national electrical codes for 104 A currents.
3. Ground the drive chassis securely to the central enclosure ground bar using low-impedance copper conductors to suppress EMI.
4. Route encoder feedback and low-voltage control signals in shielded cables physically separated from motor output power cables.
5. Ensure cabinet cooling fans or air conditioning maintain thermal conditions within standard drive operating limits during full continuous load output.