Emerson UNI3403 CT Unidrive Inverter Drive Board | Replacement, Equivalent & Selection Guide
The Emerson UNI3403 is a drive control board designed for the Control Techniques (CT) Unidrive series of AC variable-speed drives. As a critical power electronics component, it governs IGBT gate drive signals, fault detection, and DC bus interface functions. Konmask.com supplies both genuine and compatible-grade UNI3403 boards for MRO, retrofit, and system integration applications.
Technical Specifications
- Part Number: UNI3403
- Manufacturer: Emerson / Control Techniques (CT)
- Series: Unidrive Classic / Unidrive SP (compatible)
- Function: Inverter Drive Board (IGBT Gate Drive & Power Interface)
- Weight: 460 g
- Form Factor: PCB assembly, plug-in module
- Operating Voltage: Refer to drive frame size rating
- Compatibility: Unidrive Classic frame sizes 3–5 (verify by drive nameplate)
- Condition Available: New OEM, Tested Refurbished, Exchange
Compatible Replacement & Equivalent Models
When the UNI3403 is unavailable or discontinued, the following models may serve as functional equivalents or drop-in replacements (verify frame size and firmware revision before substitution):
- UNI3401 – Earlier revision; same form factor, check firmware compatibility
- UNI3402 – Intermediate revision; functionally equivalent in most Unidrive Classic frames
- UNI3404 – Later revision; backward-compatible in select frame sizes
- SP3403 – Unidrive SP series equivalent; confirm connector pinout before installation
- CT Part No. 3703-0003 – OEM cross-reference for Unidrive frame 3 drive board
- Third-party compatible boards from approved MRO suppliers (contact Konmask for vetted options)
Note: Always cross-reference the drive serial number and frame size with CT documentation before ordering a replacement board.
Why Choose the Original UNI3403
- Factory-calibrated gate drive timing for optimal IGBT switching performance
- Full compatibility with CT Unidrive firmware and diagnostic tools (CT Soft, UniSoft)
- Guaranteed fit for OEM frame dimensions — no mechanical modification required
- Traceable manufacturing batch and quality certification
- Reduced commissioning risk versus generic third-party alternatives
Typical Applications
- Industrial pump and fan speed control (HVAC, water treatment)
- Conveyor and material handling drive systems
- Compressor and blower variable-speed retrofit
- CNC machine tool spindle drives
- Crane and hoist motion control
- Replacement MRO for existing Unidrive Classic installations
System Compatibility
- Drive Series: Control Techniques Unidrive Classic, Unidrive SP (selected frames)
- Frame Sizes: Frame 3, Frame 4, Frame 5 (confirm with drive nameplate)
- Control Interface: Compatible with CT Soft v2.x and UniSoft configuration software
- Fieldbus: Works with existing SM-Profibus, SM-DeviceNet, SM-CANopen option modules
- PLC Integration: Tested with Siemens S7, Allen-Bradley ControlLogix, Mitsubishi Q-series via standard fieldbus
Selection Guide
Use the following criteria to confirm the correct board for your application:
- Step 1 – Identify drive model: Locate the full model number on the drive nameplate (e.g., UNI3403-A or UNI3403-B suffix indicates hardware revision).
- Step 2 – Confirm frame size: Frame size determines PCB dimensions and connector positions. Do not substitute across frame sizes.
- Step 3 – Check firmware version: Some board revisions require minimum firmware versions. Verify with CT documentation or contact Konmask support.
- Step 4 – Assess condition requirement: Choose New OEM for critical production lines; Tested Refurbished for budget MRO; Exchange for fastest turnaround.
- Step 5 – Quantity & lead time: Contact Konmask for bulk pricing and availability on multi-unit orders.
Quality Assurance & Sourcing
- All boards are inspected and function-tested prior to dispatch
- Refurbished units include full power-on test and 90-day warranty
- New OEM units supplied with original manufacturer packaging where available
- Sourced from authorized distributors and verified MRO channels
- Anti-static packaging and secure export carton for international shipment
How to Order
- Add Emerson UNI3403 to cart and proceed to checkout, or
- Contact us directly for bulk orders, exchange programs, or urgent requirements:
- Email: [email protected]
- Phone/WhatsApp: +0086 19859288691
- Website: https://Konmask.com
Replacement & Compatibility FAQ
Q: Can UNI3402 replace UNI3403 directly?
A: In most Unidrive Classic Frame 3 applications, yes — but verify the hardware revision suffix and firmware version before installation.
Q: Is the UNI3403 compatible with Unidrive SP?
A: The Unidrive SP uses a revised board architecture. SP-series equivalent boards (SP3403) are recommended; cross-fitting Classic boards to SP frames is not supported.
Q: Do you offer an exchange / core return program?
A: Yes. Send your faulty UNI3403 as a core return and receive a tested refurbished unit at reduced cost. Contact us for details.
Q: What is the lead time for a new OEM UNI3403?
A: Stock items ship within 1–3 business days. Non-stock or discontinued items may require 5–15 business days sourcing. Contact Konmask for current availability.
Q: Can Konmask provide a certificate of conformance?
A: Yes, CoC and test reports are available upon request for new OEM and refurbished units.
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Contact: [email protected] | +0086 19859288691
