Emerson SP4402 – High‑performance general‑purpose AC frequency converter for demanding motor control

The Emerson SP4402 sits in the proven Unidrive SP family, designed for precise and efficient control of three‑phase induction and permanent‑magnet motors. From my experience, this model hits a sweet spot for retrofit and OEM projects that need dependable vector control, flexible I/O, and straightforward fieldbus integration—without turning commissioning into a science project. You might notice that it feels equally at home on a conveyor line as it does on a pump skid, which is exactly what most maintenance teams are after.

Order Placement Process and Guarantees

• – Warranty period: 365 days

• – Delivery time: 1 week for in‑stock; no more than one month at the latest

• – Payment: 50% advance payment; full payment before delivery

– Express delivery methods: FedEx, UPS, DHL

Key Features

• High‑accuracy vector control – Delivers tight speed and torque regulation for induction and PM motors, typically with stable low‑speed performance for conveyors, winders, and mixers.
• Robust power platform – Designed for 3‑phase 380–480 VAC grids, 50/60 Hz, with solid protection features (overcurrent, overvoltage, thermal) that reduce nuisance trips.
• Flexible I/O for quick integration – Multiple digital inputs/outputs, analog I/O (voltage/current), and a relay output make it easy to match existing PLC signals.
• Onboard RS485 (Modbus) – Simple parameter access for SCADA/PLC, plus option slots for common fieldbus modules when you need deterministic networks.
• Energy‑saving modes – Adjustable switching and control strategies that, in many cases, trim kWh usage on fans and pumps without sacrificing throughput.
• Application macros – Pre‑built profiles typically shorten commissioning for pumps, cranes/hoists, and general machinery.
• Brake chopper support – Dynamic braking capability on applicable ratings for faster deceleration cycles in indexing and vertical axes.
• Serviceability – Clear diagnostics and parameter sets you can back up and clone; maintenance teams usually appreciate the minimal learning curve.

Technical Specifications

Brand / Model	Emerson SP4402 (Unidrive SP series)
HS Code	8504.40 (Static converters, AC drives)
Power Requirements	3‑phase 380–480 VAC ±10%, 50/60 Hz; integrated DC bus terminals for common DC where applicable
Operating Temperature	0 to +40°C without derating; up to +50°C with typical derating (clean, ventilated cabinet)
Signal I/O Types	Digital inputs/outputs (24 V), analog inputs (0–10 V / 4–20 mA), analog output, 1x relay output; encoder/feedback via option module
Communication Interfaces	Onboard RS485 (Modbus RTU); expansion options for Profibus‑DP, DeviceNet, CANopen, EtherNet/IP, Modbus/TCP
Enclosure / Installation	IP20, panel/cabinet mounting; through‑panel cooling kits available on select variants
Dimensions & Weight	Frame 4 footprint (typical for this model); check exact variant before panel cutout planning

Notes: Specifications above reflect commonly supplied SP4402 units. Exact I/O counts and options depend on installed modules and rating. If you’re matching an existing panel, share the nameplate and we’ll verify the frame and option set.

Application Fields

The SP4402 is a generalist by design, so it tends to fit where balanced performance and reliability matter more than niche features.

• Material handling – conveyors, sorters, stackers with smooth ramping and quick jog modes.
• Pumps and fans – variable torque energy savings, sleep/wake, and simple PID control.
• Packaging and converting – tension control with encoder feedback and rapid decel using a brake resistor.
• Cranes/hoists and elevators (non‑safety axes) – stable torque at low speed; consult for STO options.
• Process lines – mixers, extruders, and general plant drives synced over Modbus or Profibus.

A maintenance supervisor at a water treatment plant told us, “We swapped in an SP4402 in under two hours, copied the parameters, and the pump station was back on spec before shift change.” That seems to be the typical experience when replacing legacy inverters.

Advantages & Value

• Reliability you can plan around – Proven hardware with conservative thermal design reduces unplanned downtime.
• Compatibility – Plays well with mainstream PLCs over Modbus/Profibus/DeviceNet; encoder and I/O options keep retrofit wiring simple.
• Total cost control – Configurable energy modes and regenerative options (system‑level) can cut operating costs on variable‑torque loads.
• Lifecycle support – Parameter backup/clone and widely available spares keep maintenance budgets reasonable.
• Risk reduction – We can pre‑check your motor data and application profile to avoid sizing or thermal surprises.

Installation & Maintenance

• Cabinet and environment – Mount in a clean, dry, ventilated enclosure (typically IP54+ if dusty). Keep clearances for airflow; avoid heat sources directly below.
• Wiring – Use shielded control cables, segregate power and control, and land PE/ground with low impedance. Fit suitable line fusing and an EMC filter per installation region.
• Braking and DC bus – If fast stops are needed, specify a matched braking resistor. For multi‑drive systems, common DC bus can simplify energy sharing—verify ratings first.
• Safety – Lockout/Tagout during service; verify STO or safety relays where required by the machine risk assessment.
• Routine maintenance – Inspect fans and heatsinks quarterly, clear dust, check terminals for torque. Back up parameters after any change. Firmware updates can be applied during scheduled downtime.
• Commissioning tips – Run motor autotune (static or rotating as allowed), set acceleration/deceleration ramps, and validate protection thresholds before live production.

Supporting Components (popular with SP4402)

• SM‑Applications Plus – Advanced logic/motion module for local sequencing and custom control blocks.
• SM‑Profibus‑DP / SM‑DeviceNet / SM‑CANopen / SM‑Ethernet – Fieldbus interfaces for easy PLC integration.
• SM‑Encoder Plus – High‑resolution feedback for precise speed/torque control or basic positioning.
• EMC line filters and input reactors – Helps meet site EMC requirements and improves grid robustness.
• Braking resistors – Sized to the duty cycle for rapid deceleration without drive trips.

Quality & Certifications

• CE compliant; typically conforms to Low Voltage and EMC Directives when installed per manual.
• UL/cUL listed on most standard ratings; RoHS compliant where applicable.
• Manufacturing aligned with ISO 9001 quality systems.
• Standard warranty: 365 days (repair/replace) under normal use.