What is the difference between PVC high-speed doors and ordinary roller shutters?

The core differences lie in operating speed and airtightness. Speed: High-speed doors run at 0.8–2.0 m/s, 5 to 10 times faster than standard roller shutters, greatly reducing air convection between indoor and outdoor spaces. Airtightness: Equipped with bottom safety airbags (air seals) and side brush/rubber gaskets. Ordinary roller shutters feature rigid bottom bars with visible gaps. Application: High-speed doors are designed for high-frequency traffic (over 500 daily cycles) and spaces requiring constant temperature, dustproofing, and insect resistance, such as cold storage warehouses, food processing plants, and logistics centers.

How do I select the correct model/track type?

The choice depends mainly on installation space and wind resistance requirements: Turbo / Roller Type (Round Track) The curtain rolls up onto a top drum, requiring minimal side clearance with fast operation. Wind resistance is moderate (Grade 6–8 wind). Ideal for indoor clean zones. Stacking Type (Square Track) The curtain folds upward in layers like a curtain. Superior wind resistance; steel tubes can be fitted to withstand Grade 12 typhoons. Suitable for outdoor openings or cold storage with high wind pressure. Zipper Self-Repair Type Built-in zipper track structure automatically realigns the curtain in one full upward lift if derailed after forklift impact. Perfect for passageways with frequent forklift collisions.

What door opening dimensions and lifting height should I provide to the manufacturer?

Submit the clear structural opening size (Width × Height). Note: High-speed doors require a minimum 500–800 mm overhead clearance above the opening for motor and roller installation. Notify the manufacturer in advance if overhead beams or fire pipes exist.

What if the floor surface is uneven during installation?

Uneven floors are a common issue. The bottom safety airbag of high-speed doors must fully contact the ground to maintain sealing and anti-pinch performance. Solutions: If the floor height difference exceeds ±10 mm, install sloped leveling pads (cement or rubber ramps) under the door frame, or select bottom beams with mechanical spring compensation.

What power supply and air piping capacity need to be reserved?

Power Supply: Domestic standard 220V/50Hz or 380V industrial power, power rating 0.75kW – 2.2kW. Follow the manufacturer’s specified wire gauge; pure copper cables of 4 mm² cross-section or larger are recommended. Air Supply (Inflatable Seals Only): Some high-airtight cold storage doors require compressed air supply at 0.4–0.6 MPa.

What trigger options are available for opening/closing doors? Which works best?

Common trigger modes: Radar Motion Sensor: Automatically opens upon detecting people or vehicles, ideal for logistics aisles. Note: Standard radar may fail to detect idling forklifts; micro-motion radar is recommended for this scenario. Ground Induction Loop: Buried underground coil detects metal vehicles, highly stable with zero false triggers, but ground cutting is required during construction. Pull Cord / Push Button (Manual): Traditional low-cost solution for pedestrian walkways. Bluetooth / Remote Control: Remote operation within a 30-meter range. 👉 Recommendations: Main logistics aisles: Ground induction loop + pull cord combination Pedestrian passages: Radar sensor + push button

Why does the door frequently drop halfway then rebound upward automatically?

This issue is usually caused by blocked or dusty photoelectric safety light curtains. When descending, if the light curtain detects obstructions (dust, cobwebs, even intense direct light), the door instantly rebounds upward. Troubleshooting: Wipe the infrared photoelectric sensors on both sides of the door frame with a dry cloth, or realign the transmitter and receiver lenses.

What to do during power failure if the door gets stuck mid-height and cannot open?

All national standard high-speed doors come with a manual hand crank. Locate the hexagonal shaft at the rear of the motor, attach the crank handle, and rotate clockwise to manually lift the curtain. For zipper-type doors, pull the emergency release cord first to disengage the brake before cranking.

Can a torn curtain be repaired, or does the whole curtain need full replacement?

Minor tears (under 10 cm): Cold repair using special PVC adhesive and matching fabric patches; normal function remains unaffected after repair. Large damage or edge rips: Full curtain replacement is advised. Domestic curtains cost several hundred RMB, while imported brands (such as French Nergal) carry a higher price tag. Zipper-style door curtains can be quickly detached and replaced by on-site staff.

How often is maintenance required? Which components need inspection?

Professional maintenance every 3 months is recommended. Focus on 3 core components during daily checks: Torsion Spring Balance System: Listen for abnormal operating noise. If lifting the door feels laborious, spring fatigue has occurred — contact the manufacturer to adjust spring turns (extremely hazardous; never disassemble springs independently). Limit Encoder: Verify full open/closed positioning. Recalibration by the manufacturer is required if the door drifts out of position (electronic limiters are sensitive to water and moisture). Brake Assembly: Check for jitter or abrupt stops during descent. Adjust brake clearance if braking performance weakens.

My door breaks down almost daily; the manufacturer claims unstable voltage is the cause — is this true?

Voltage fluctuations can indeed trigger malfunctions. High-speed door motors only tolerate ±10% voltage deviation. Solution: If high-power factory equipment causes sudden voltage drops during startup, install a 1.5kW–2.2kW voltage stabilizer, or inspect burnt transformers inside the control cabinet.

How do high-speed doors achieve anti-collision and anti-pinch protection?

Anti-Collision (Obstruction Rebound): Driven by motor current detection. When the descending curtain hits an obstacle, motor current surges, and the control system halts operation and lifts the door immediately. Anti-Pinch (Safety Bottom Edge): Inflatable airbags along the door bottom trigger micro-switches via internal air pressure changes upon contact with objects, forcing instant rebound. Regularly inspect airbags for air leakage; a deflated airbag renders anti-pinch protection useless.

How to wire fire linkage integration?

All high-speed door control cabinets are pre-fitted with fire dry contact terminals (NO/COM). When the fire control room sends a passive signal or main power is cut off, the door must automatically rise to full open position to facilitate personnel evacuation. Mandate certified electricians complete this wiring during installation, otherwise fire safety inspection will fail.