FUJI TEC-1VM EP-3955B Elevator Control Board

FUJI TEC-1VM EP-3955B Elevator Control Motherboard — Every Hour of Downtime Costs You Money. We Ship Today.

Your elevator is dead. The building manager is calling. Technicians are standing by with nothing to do. You’ve already traced the fault to the FUJI TEC-1VM EP-3955B High Power Motherboard — and now you need a replacement unit in hand, not a lead time quote that stretches into next week.

We stock the TEC-1VM EP-3955B in Xiamen. Orders confirmed before 3:00 PM CST ship same day via DHL Express or FedEx International Priority. Most destinations in Southeast Asia receive within 48–72 hours. Europe and the Americas within 3–5 business days. No middlemen. No warehouse delays. Direct from our verified inventory to your job site.

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📧 Email: [email protected]
📱 WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

The EP-3955B sits at the heart of the TEC-1VM drive stack. When it fails, the symptoms are rarely subtle — you’ll typically see one or more of the following before the system locks out completely:

• E-07 / E-08 fault codes: Main control board communication loss with the inverter gate driver stage. If resetting the drive clears the fault but it returns within minutes under load, the EP-3955B is the primary suspect — not the IGBT module.
• Erratic floor leveling: The board handles encoder feedback processing. A degraded capacitor bank on the EP-3955B causes intermittent position errors that look like encoder faults. Swap the board before condemning the encoder.
• No-run condition with all safety inputs confirmed closed: Internal watchdog timer failure on the motherboard. The drive will not generate a run command even with a valid start signal. Measure the 5V logic rail on the board — if it’s sagging below 4.75V under load, the board’s onboard regulator has failed.
• Overtemperature trips at ambient below 30°C: Thermistor circuit on the EP-3955B can develop high-resistance drift, reporting false temperatures. Verify with an external thermocouple before replacing the cooling fan.

Replacement procedure — key checkpoints:

1. Power isolation: Isolate main supply and wait a minimum of 10 minutes for the DC bus capacitors to discharge below 50V. Verify with a meter — do not rely on the discharge indicator LED alone on older TEC-1VM units.
2. Parameter backup: Before pulling the board, confirm your parameter set is saved to the keypad or a PC tool. The EP-3955B does not retain parameters independently — they live in the drive’s EEPROM which is tied to the board assembly on some firmware revisions.
3. DIP switch configuration: The EP-3955B carries a 4-position DIP switch bank (SW1) on the lower-right corner of the PCB. Match the switch positions from the failed board exactly before powering up. Incorrect settings will cause the drive to boot in the wrong control mode (V/F vs. vector) and may trigger immediate overcurrent trips.
4. Firmware revision check: Cross-reference the firmware label on the replacement board against the original. TEC-1VM systems with firmware below V2.3 have known incompatibilities with EP-3955B boards manufactured after 2019. If revisions don’t match, contact us — we can source revision-matched units.
5. Auto-tuning: After installation, run a stationary auto-tune cycle before returning the elevator to service. The new board’s motor model parameters will be at factory defaults and will not match your motor without tuning.
6. First run monitoring: Monitor DC bus voltage, output current, and heatsink temperature during the first 10 run cycles. Any anomaly in the first 30 minutes of operation is board-related, not mechanical.

Reliability in Harsh Conditions

Elevator machine rooms are not clean environments. The EP-3955B is built to operate where most industrial electronics struggle — and understanding its design margins matters when you’re deciding whether to repair or replace.

The board’s power section uses industrial-grade electrolytic capacitors rated for 105°C continuous operation, not the 85°C consumer-grade components that fail prematurely in high-ambient machine rooms. The conformal coating on the signal processing layer provides protection against condensation and airborne contaminants — a real concern in coastal installations and basement machine rooms with poor vapor barriers.

Vibration tolerance is engineered to IEC 60068-2-6 standards. The through-hole construction of the high-current sections — rather than surface-mount — means solder joint fatigue from thermal cycling and mechanical vibration is significantly reduced compared to later-generation boards that moved to full SMT assembly.

Operating temperature range spans -10°C to +50°C ambient, with derating above 40°C. Humidity tolerance is 5–95% RH non-condensing. In practice, units installed in properly ventilated machine rooms routinely exceed 10 years of service life before the first capacitor-related failure.

Every unit we ship has been stored in climate-controlled conditions with anti-static protection. Long-term storage in uncontrolled environments — a common issue with grey-market surplus — causes electrolytic capacitor dry-out and PCB oxidation that won’t show up on a bench power-on test but will cause field failures within months. Our inventory management prevents this.

Global Express Logistics

Our dispatch hub is in Xiamen, Fujian Province, China — one of China’s primary export ports with direct DHL and FedEx gateway access. This is not a drop-ship arrangement. Stock is physically on our shelves, inspected, and ready to pack.

Shipping options:

• DHL Express Worldwide: 2–4 business days to most of Asia, Middle East, and Europe. 3–5 days to the Americas. Real-time tracking from pickup to delivery.
• FedEx International Priority: Comparable transit times with strong coverage in North America and Western Europe. Preferred for shipments requiring specific delivery time windows.
• FedEx International Economy: 5–7 business day option for non-urgent replenishment orders where cost optimization matters more than speed.

Export documentation included with every shipment: Commercial invoice with accurate HS code classification (8537.10 for control boards), packing list, certificate of origin, and — on request — a functional test report. We handle customs declaration preparation as standard. For destinations with specific import requirements (India IGST, EU customs valuation, etc.), contact us before ordering and we’ll prepare the documentation set accordingly.

Packaging: each EP-3955B ships in a double-wall corrugated outer carton with 50mm foam surround, anti-static inner bag, and moisture-barrier desiccant pack. The board does not move inside the box. We’ve shipped to active construction sites in the Middle East and offshore platform supply vessels in Southeast Asia — the packaging holds.

For orders placed before 15:00 CST Monday–Friday, same-day dispatch is standard. Weekend orders ship first thing Monday morning. You will receive a tracking number within 2 hours of dispatch.

Contact Information

📧 Email: [email protected]
📱 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com

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