Description

Introduction to Elevator Speed Limiter Encoder HES-1024-2D
Manufactured by NANJING ZHUYE ELEVATOR PARTS

The HES-1024-2D is a high-resolution, fail-safe rotary encoder specifically engineered for elevator speed-limiting systems. Designed, calibrated and validated by NANJING ZHUYE ELEVATOR PARTS, it provides the critical shaft-speed feedback required by traction and machine-room-less (MRL) controllers to detect overspeed conditions and trigger safety gear or rope brake devices in compliance with EN 81-20/50, ASME A17.1 and GB 7588. The unit is CE, UL and CCC certified and field-proven on OTIS, KONE, Schindler, Thyssen and domestic VVVF drives worldwide.

1. Technical Specifications
• Electrical Interface: 10–30 V DC, RS-422 differential line-driver (A, /A, B, /B, Z, /Z)
• Resolution: 1 024 pulses/revolution (standard); 2 048 ppr available on request
• Frequency Response: 0–300 kHz, corresponding to 0.01–4 m/s car speed @ Ø 200 mm sheave
• Accuracy: ±0.08° (±1 arc-min), jitter < 0.5 µs
• Phase Shift: 90° ± 3° between A and B channels for reliable quadrature counting
• Load: 50 mA per channel, short-circuit protected, reverse-polarity protected
• Cable: 8-core shielded PUR, 5 m standard; 10 m, 15 m or M12 quick-connect optional
• Housing: Ø 58 mm, IP65 aluminium tube with IP67 axial connector; salt-spray 500 h per ASTM B117
• Bearings: ABEC-5 double-sealed ball bearings, grease-filled for –30 °C to +100 °C operation
• Shaft: Ø 6 mm stainless-steel, radial load 40 N, axial load 30 N
• Shock/Vibration: 100 g shock (6 ms), 20 g vibration (10–2 000 Hz)
• MTBF: > 100 000 h @ 40 °C per MIL-HDBK-217F

2. Fail-Safe & Diagnostic Features
• Dual-supply monitoring: on-board comparator flags brown-out < 9 V and sends fault bit to controller.
• Internal temperature sensor: digital output trips if > 100 °C, preventing drift-related errors.
• Reverse-rotation detection: controller logic uses Z-pulse and phase sequence to confirm correct sheave direction.
• Open-circuit & short-circuit detection: RS-422 line-monitor IC pulls fault line low within 10 ms.
• SIL 2 / PL c capability: single-failure safe with redundant evaluation channel.

3. Installation & Compatibility
• Universal Ø 58 mm pilot and servo-flange option fits standard flexible couplings or timing-belt assemblies.
• Radial M12 connector with 360° shield termination ensures EMC immunity per IEC 61800-3.
• Colour-coded cores and laser-etched wiring diagram reduce on-site errors; total installation time < 5 minutes.
• Plug-and-play with most VVVF drives: OTIS GECB, KONE LCE, Schindler 5500, Thyssen MC2, and modern domestic controllers.

4. Performance Benefits
• < 1 ms delay from shaft motion to digital output—critical for overspeed triggers at 115 % rated speed.
• 1 024 ppr resolution gives 0.25 mm car-position accuracy on 400 mm diameter sheave, improving levelling precision.
• Bearing grease formulation minimises micro-slip, ensuring encoder stability during emergency brake application.
• IP65/IP67 rating permits high-pressure washing of machine-room-less pits without additional protection.

5. Environmental & Regulatory Compliance
All electronics are RoHS 2.0, REACH and halogen-free; housing is 100 % recyclable aluminium. Production takes place in NANJING ZHUYE ELEVATOR PARTS’ ISO 14001-certified facility, monitored for energy consumption and waste recycling.

6. Typical Applications
• Overspeed governor (OSG) feedback for traction lifts up to 4 m/s
• Rope-brake or safety-gear speed monitoring
• Car-position reference in high-rise regenerative drives
• Modernisation of older DC or analogue speed limiters

7. After-Sales Support
NANJING ZHUYE ELEVATOR PARTS offers a 3-year worldwide warranty, 24-hour technical hotline, next-day global spare-part dispatch, and free cloud-based diagnostic software. Custom resolutions, special shafts, or MIL-spec connectors can be supplied within 7 working days.

Conclusion
Specifying the HES-1024-2D speed limiter encoder from NANJING ZHUYE ELEVATOR PARTS delivers SIL-certified safety, sub-millisecond response, and maintenance-free longevity—ensuring passenger safety and regulatory compliance in every vertical-transportation project.