Emerson UNI3402 CT Unidrive Inverter Drive Board | Replacement, Equivalent & Selection Guide
The Emerson UNI3402 is a drive control board designed for the Control Techniques (CT) Unidrive series of AC variable frequency drives. This board serves as the core logic and control interface within the Unidrive platform, managing speed regulation, I/O processing, and communication functions. Whether you need an OEM replacement, a compatible equivalent, or guidance on selecting the right board for your system, this page provides a complete technical reference.
Technical Specifications
- Part Number: UNI3402
- Manufacturer: Control Techniques / Emerson Industrial Automation
- Series: Unidrive Classic / Unidrive SP (compatible)
- Function: Inverter Drive Control Board (main control PCB)
- Weight: Approx. 460 g
- Form Factor: PCB module, plug-in replacement
- Communication: Compatible with CT Comms interface (RS-485 / ANSI)
- Operating Temperature: 0°C to +50°C (standard industrial range)
- Compliance: CE, RoHS (verify with original documentation)
- Condition Available: New OEM, Refurbished, Tested Used
Compatible Replacement & Equivalent Models
The following models are commonly referenced as replacements or functional equivalents for the UNI3402. Always verify firmware version and drive frame size before substitution:
- UNI3401 – Earlier revision; functionally similar, check firmware compatibility
- UNI3403 – Later revision with enhanced diagnostics
- UNI3404 – Upgraded variant for higher-frame Unidrive units
- SP3402 – Unidrive SP series equivalent (verify I/O mapping)
- CT-COMMS-USB – Required for parameter backup before board swap
Note: Cross-referencing by frame size and firmware version is essential. Contact Konmask.com for a verified compatibility check before ordering.
Why Choose the Original UNI3402
- ✅ OEM-grade reliability – Designed and tested to Control Techniques factory specifications
- ✅ Plug-and-play replacement – Direct fit for Unidrive Classic frames without hardware modification
- ✅ Parameter retention – Supports full parameter upload/download via CT Comms
- ✅ Proven field record – Widely deployed in manufacturing, HVAC, and process control applications
- ✅ Sourced from verified supply chains – Konmask.com sources from authorized distributors and certified refurbishers
Typical Applications
- Pump and fan speed control in HVAC systems
- Conveyor and material handling drive replacement
- CNC and machine tool spindle drive repair
- Water treatment and process automation systems
- Textile, printing, and packaging machinery
- General industrial AC motor drive maintenance
System Compatibility
The UNI3402 is designed for use within the Control Techniques Unidrive Classic platform. Confirm compatibility using the following criteria:
- Drive Series: Unidrive Classic (UNI series)
- Frame Size: Verify against your drive nameplate (Frame 1–6 typical)
- Firmware Version: Match or upgrade firmware after board replacement
- Power Rating: Board is rating-agnostic; power stage is separate
- Software Tool: CT Soft or UniSoft for parameter management
Selection Guide
Use this guide to identify the correct board for your application:
- Step 1 – Identify your drive model: Check the nameplate on your Unidrive unit for the full model number (e.g., UNI3402, UNI3401).
- Step 2 – Check frame size: Frame size determines physical fitment. Do not substitute across frame sizes without engineering review.
- Step 3 – Confirm firmware: Note the existing firmware version. Replacement boards may require firmware flashing.
- Step 4 – Backup parameters: Use CT Comms or UniSoft to save all drive parameters before removing the old board.
- Step 5 – Contact Konmask: Send your drive model, serial number, and fault description to support@konmask.com for a verified recommendation.
Quality Assurance & Sourcing
All UNI3402 boards supplied by Konmask.com undergo the following quality process:
- Visual inspection for physical damage, burnt components, and corrosion
- Functional bench test under simulated drive load conditions
- Firmware version verification and documentation
- Anti-static packaging with humidity indicator card
- 90-day warranty on refurbished units; 12-month warranty on new OEM stock
We source exclusively from authorized distributors, OEM surplus channels, and certified industrial refurbishers. Counterfeit or untested boards are never listed.
How to Order
- Online: Add to cart directly from this page — stock levels are updated in real time.
- Email: support@konmask.com — include your drive model, quantity, and required condition (new/refurbished).
- Phone/WhatsApp: +0086 19859288691
- Lead Time: In-stock items ship within 1–3 business days. Out-of-stock items: 7–21 days sourcing lead time.
- Export: We ship worldwide. DDP/DAP terms available for bulk orders.
Replacement & Compatibility FAQ
Q: Can I use a UNI3401 instead of a UNI3402?
A: In many cases yes, but firmware versions must match. Contact us for a compatibility check before ordering.
Q: Do I need to re-enter all parameters after replacing the board?
A: Yes, unless you backed up parameters via CT Comms/UniSoft beforehand. We recommend always backing up before any board swap.
Q: Is the UNI3402 compatible with Unidrive SP drives?
A: The Unidrive SP uses a different control board architecture. The SP3402 or equivalent SP-series board is required for SP drives.
Q: What warranty do you offer?
A: 90 days on refurbished, 12 months on new OEM. All units are tested before dispatch.
Q: Can you source a UNI3402 if it’s not currently in stock?
A: Yes. Email us your requirement and we will provide a sourcing timeline and quote within 24 hours.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
