ELCO EB100P38-P6PR-1024 Incremental Rotary Encoder – EB100 Series

ELCO EB100P38-P6PR-1024: Hollow-Shaft Incremental Encoder for Precision Motion Control

The ELCO EB100P38-P6PR-1024 is a 38 mm hollow-shaft incremental rotary encoder from the EB100 series, delivering 1024 pulses per revolution via a push-pull output stage. Engineered for continuous-duty industrial environments, this encoder serves as the primary position and velocity feedback element in servo drive loops, CNC axis controllers, and high-cycle material-handling systems. Its aluminum alloy housing, dual-bearing shaft support, and IP65-rated sealing make it a structurally sound choice for machine tool and packaging line integration where vibration, coolant mist, and particulate contamination are routine operating conditions.

Unlike encoders that rely on single-ended open-collector outputs, the EB100P38-P6PR-1024 push-pull driver actively sources and sinks current on each signal line (A, B, Z), eliminating the need for external pull-up resistors and reducing susceptibility to capacitive line loading at cable runs up to 100 m. The 38 mm hollow bore accommodates direct motor shaft mounting without a coupling adapter, removing one mechanical compliance element from the feedback path and improving dynamic stiffness of the position loop.

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Technical Parameters

Hardware Logical Analysis

The EB100P38-P6PR-1024 is built around a transmissive optical disc with 1024 radial slits etched at uniform angular intervals. A collimated infrared LED illuminates the disc, and a matched photodetector array on the opposite face generates sinusoidal photocurrents that are subsequently shaped into square-wave digital signals by a Schmitt-trigger comparator stage. This architecture produces clean signal edges with rise and fall times typically below 1 µs, which is critical for high-speed HSC (High-Speed Counter) inputs on PLCs such as the Siemens S7-1200 or S7-1500 series.

EMC Design: The encoder’s internal PCB employs a ground-plane pour that surrounds all signal traces, reducing radiated emissions and providing a low-impedance return path for transient currents. The push-pull output stage inherently rejects common-mode noise because both the high-side (sourcing) and low-side (sinking) transistors are referenced to the same internal supply rail. In environments with variable-frequency drives (VFDs) generating conducted interference on the 24 V DC bus, this topology maintains signal integrity without requiring ferrite bead filters on the cable.

Bearing Architecture: Dual deep-groove ball bearings are preloaded against each other in an O-arrangement, eliminating axial play and maintaining disc-to-detector gap stability across the full radial and axial load envelope. Bearing preload is factory-set and non-adjustable, ensuring consistent optical alignment throughout the service life of the unit. Grease selection is rated for the full −10 °C to +70 °C operating range without re-lubrication intervals under normal duty cycles.

Hollow-Shaft Coupling Mechanics: The 38 mm hollow bore is machined to an H7 tolerance, providing an interference-fit or clamping-collar interface directly onto the motor shaft. This eliminates the torsional compliance and backlash inherent in jaw or bellows couplings used with solid-shaft encoders, reducing phase lag in the velocity feedback loop and improving bandwidth of the speed controller. A stator coupling bracket (torque arm) prevents housing rotation while allowing axial thermal expansion of the shaft.

System Integration Benefits

• Direct PLC HSC compatibility: The push-pull output drives Siemens S7-1200/1500 HSC inputs (up to 1 MHz on onboard channels) without signal conditioning, reducing BOM complexity and wiring labor.
• Deterministic velocity feedback: 1024 PPR at 3000 RPM yields a pulse frequency of 51.2 kHz, providing velocity resolution of 0.059 RPM per count interval at a 1 ms sampling period — sufficient for tight speed regulation in winding and extrusion applications.
• Zero-pulse index channel: The Z channel generates one pulse per revolution, enabling absolute homing routines without a separate proximity switch, reducing hardware count and simplifying the homing sequence in the motion program.
• Wide supply voltage tolerance: The 10–30 V DC input range accommodates both 12 V and 24 V DC encoder supply rails, allowing the same part number to be used across multiple machine variants without re-specifying the encoder.
• Reduced mechanical compliance: Hollow-shaft direct mounting eliminates coupling-induced resonance frequencies that can excite the velocity loop and cause audible noise or instability in servo systems with high proportional gain settings.
• Diagnostic transparency: Signal integrity can be verified with a standard oscilloscope or encoder tester at the connector without disassembly, enabling in-situ fault diagnosis and reducing mean time to repair (MTTR).
• Long cable drive capability: The push-pull output sustains signal integrity on shielded twisted-pair cables up to 100 m at 100 kHz pulse frequency, covering most machine and conveyor line layouts without repeaters or line drivers.
• Servo drive compatibility: The output signal levels and timing characteristics are within the input specifications of Siemens SINAMICS S120, Yaskawa Sigma-7, Panasonic MINAS A6, and Delta ASDA-A3 drives, enabling drop-in integration without firmware parameter changes to the encoder interface card.

Quality Assurance & Global Logistics

Every ELCO EB100P38-P6PR-1024 unit supplied through siemensplc.com is sourced from verified distribution channels and undergoes incoming inspection covering connector integrity, housing condition, and signal output verification prior to dispatch. Batch traceability records and certificates of conformity are available on request for quality-management systems operating under ISO 9001 or IATF 16949 frameworks.

Shipments originate from our warehouse in Xiamen, China. Xiamen is a designated free-trade port with direct air freight connections to major industrial hubs in Europe, Southeast Asia, the Middle East, and the Americas. Standard in-stock orders are dispatched within 1–3 business days via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with door-to-door transit times of 3–7 business days to most destinations. For time-critical plant shutdowns, same-day dispatch is available on confirmed orders received before 14:00 CST.

Export documentation — including commercial invoice, packing list, and HS code declaration (HS 9031.80) — is prepared in compliance with customs requirements for the destination country. Customers in the EU, UK, and Australia can request REACH/RoHS compliance statements. All shipments are fully insured against transit damage and loss.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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