DAIHEN UM356B L21700M (L21700M03) PCB-I-E-1171 PC Board | Replacement, Equivalent & Selection Guide
The DAIHEN UM356B L21700M (L21700M03) PCB-I-E-1171 is an inverter control PC board designed for DAIHEN welding power sources and industrial automation systems. As a precision-engineered printed circuit board, it governs core inverter switching logic, feedback control, and protection circuits within the UM356B series. Konmask.com stocks genuine and compatible replacement units to minimize your downtime.
Technical Specifications
- Manufacturer: DAIHEN Corporation
- Model / Series: UM356B
- Part Number: L21700M / L21700M03
- Board Reference: PCB-I-E-1171
- Board Type: Inverter Control PC Board
- Weight: Approx. 410 g
- Application: Welding inverter power source control
- Condition: New / Surplus / Refurbished (specify on inquiry)
Compatible Replacement & Equivalent Models
The following boards are known compatible replacements or functional equivalents for the PCB-I-E-1171. Always verify connector pinout and firmware revision before substitution:
- DAIHEN L21700M03 (direct revision of L21700M)
- DAIHEN PCB-I-E-1171 (board-level reference, same assembly)
- Compatible third-party inverter control boards for UM356B series (contact us for cross-reference)
Note: Konmask.com provides cross-reference support. Contact our team with your existing board markings for a verified match.
Why Choose the Original Model
- Exact fit: Designed specifically for the UM356B chassis — no modification required.
- Firmware compatibility: Factory-calibrated for DAIHEN inverter control logic.
- Protection circuits: Includes OCP, OVP, and thermal shutdown tuned for DAIHEN specs.
- Reliability: Genuine DAIHEN boards undergo full QC before shipment from the factory.
- Warranty support: Original parts preserve your system warranty where applicable.
Typical Applications
- DAIHEN UM356B series MIG/MAG welding power sources
- Industrial robotic welding cells using DAIHEN inverter units
- Maintenance and repair of DAIHEN welding equipment in manufacturing plants
- Spare parts inventory for production lines with DAIHEN welding systems
System Compatibility
This PC board is confirmed for use in the following DAIHEN systems:
- DAIHEN UM356B welding inverter power source
- Systems referencing board part number PCB-I-E-1171
- Units using L21700M or L21700M03 control board assemblies
If your system model is not listed, please provide your full unit serial number and we will confirm compatibility before shipment.
Selection Guide
Use the following criteria to select the correct board for your application:
- Step 1 — Confirm part number: Locate the silkscreen or label on your existing board. Match to L21700M or L21700M03.
- Step 2 — Check board revision: L21700M03 is a later revision of L21700M. Both are functionally interchangeable in most UM356B units.
- Step 3 — Verify connector layout: Compare connector positions J1–J6 with your chassis wiring harness before installation.
- Step 4 — Condition selection: Choose New for critical production lines; Surplus/Refurbished for backup or low-duty applications.
- Step 5 — Contact us for cross-reference: If you need a third-party equivalent, provide your full system model and we will source a verified alternative.
Quality Assurance & Sourcing
- All boards are inspected upon receipt and tested where possible.
- Genuine DAIHEN parts sourced from authorized distributors or OEM surplus channels.
- Compatible replacements are cross-referenced against DAIHEN service documentation.
- Each unit ships with anti-static packaging and a condition report.
- Traceability documentation available on request for industrial compliance.
How to Order
- Add the item to your cart and proceed to checkout, or
- Contact us directly for bulk orders, lead time confirmation, or custom sourcing:
📧 support@konmask.com
📞 +0086 19859288691 - Provide your system model and serial number for compatibility verification if needed.
- We accept T/T, PayPal, and major credit cards. Export documentation available.
Replacement & Compatibility FAQ
Q: Is L21700M03 a direct replacement for L21700M?
A: Yes. L21700M03 is a revised version of L21700M and is a drop-in replacement in all standard UM356B configurations.
Q: Can I use a third-party equivalent board?
A: Compatible third-party boards exist. Contact us with your system details and we will provide a verified cross-reference with technical comparison.
Q: Do you offer refurbished units?
A: Yes. Refurbished boards are tested and restored to functional specification. Ideal for backup inventory or non-critical applications.
Q: What is the lead time for this part?
A: In-stock units ship within 1–3 business days. Out-of-stock items typically have a 2–6 week lead time. Contact us for current availability.
Q: Do you ship internationally?
A: Yes. We ship worldwide via DHL, FedEx, and UPS. Export documentation and customs invoices are provided.
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Contact: support@konmask.com | +0086 19859288691
