Description

Escalator Detection Switch QS30FF400
Usage, Replacement Cycle & Maintenance Guide
by Nanjing Zhuye Elevatorparts

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INTRODUCTION
The QS30FF400 photoelectric detection switch is the “safety eye” of modern escalators. Manufactured and distributed worldwide by Nanjing Zhuye Elevatorparts, this IP69K-rated, 400 mm background-suppression sensor detects missing steps, foreign objects, and passenger presence, meeting EN 115-1 and ASME A17.1 standards. The following 800-word guide explains correct installation, daily operation, and the recommended replacement cycle to keep every escalator running safely and efficiently.

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1. PRODUCT HIGHLIGHTS
– Sensing range: 30–400 mm, background suppression
– Output: PNP/NPN, 200 mA @ 24 V DC
– IP69K stainless housing, –25 °C to +70 °C
– 4-digit display, teach-in button, M12 5-pin connector
– Response time: 2 ms, repeatability: 0.5 mm
– 10 million+ operation cycles, vibration 10 g, shock 30 g

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2. INSTALLATION METHOD
Step 1 – Preparation
De-energise the escalator; lock-out/tag-out main breaker. Record serial number and firmware version.

Step 2 – Mounting
Position sensor 50 mm above skirt line, 200 mm from step nose. Use supplied stainless bracket; torque M6 bolts to 10 N·m.

Step 3 – Wiring
Route shielded 5-core cable through PG9 gland. Connect:
– Brown: +24 V DC
– Blue: 0 V
– Black: PNP output (fault signal)
– White: NPN (optional)
– Grey: teach-in wire
Earth shield at cabinet only; maintain 50 mm separation from power cables.

Step 4 – Commissioning
Power-up; teach-in background (no step) and foreground (step present). Verify 2 ms response and <0.5 mm repeatability. Log settings and date.

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3. DAILY & PREVENTIVE MAINTENANCE
Daily (Operator)
Visual check—green LED steady, no foreign objects on lens. Wipe lens with lint-free cloth.

Monthly
Clean housing and lens with 70 % IPA. Check M12 connector tightness.

Quarterly
Measure output current (<200 mA) and response time (<2 ms). Cycle sensor 100× to verify repeatability.

Annually
Replace desiccant pack inside junction box. Perform full step-missing simulation and document results.

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4. REPLACEMENT CYCLE & INDICATORS
| Duty | Replace Every | Cycles | Warning Signs |
| Shopping mall | 5–6 years | 10 M | LED flicker, >2 ms delay |
| Metro / airport | 3–4 years | 6 M | Lens scratches, IP69K failure |
| Outdoor | 2–3 years | 4 M | Temperature drift, vibration cracks |

Replace immediately if:
– Output drift >1 mm after teach-in
– Cable fatigue, shield breakage
– Repeated “sensor fault” alarms
– Physical impact or water ingress

Maintain one spare QS30FF400 per 10 escalators for <4-hour response.

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5. WHY CHOOSE NANJING ZHUYE ELEVATORPARTS?
• Full traceability—laser-etched serial and QR code on every sensor
• Same-day global dispatch via DHL/FedEx Express
• 24/7 multilingual hotline and on-site training
• Competitive tiered pricing and custom cable lengths for OEM projects

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6. CONCLUSION
The QS30FF400 detection switch is the “safety eye” of every escalator. By following the installation, testing, and replacement guidelines—and sourcing only from Nanjing Zhuye Elevatorparts—you guarantee code compliance, reduce downtime, and protect every passenger who steps onto the moving walk.