TR CDH75M-00001: SIL3 25-Bit SSI Hollow Shaft Rotary Encoder

• Brand & Model: TR Electronic, CDH75M-00001. SIL3 and PL e certified for safety-critical tasks.
• Main Features: 25-bit total capacitance (8,192 steps/revolution x 4,096 revolutions). Two redundant detection systems with mutual µC monitoring.
• Safety Standards: SIL3 (IEC 61508), PL e (ISO 13849). PFH of the complete system = 10×10⁻⁹ 1/h.
• Electrical Data: 11–27 V DC power supply. No-load current consumption: <150 mA at 24 V DC.
• SSI Interfaces: 2×SSI with CRC-safed protocol. Transferred values include position, sign-of-life counter, error bit, and CRC.
• Unsafe Incremental Track: Fixed rectangle (RS 422) with 4,096 steps/revolution. Signals: A, A-, B, B-.

Technical Specifications at a Glance

• Mechanical Data: Permissible speed ≤3,000 min⁻¹. Shaft load = encoder dead weight. Bearing life ≥3.9×10¹⁰ revolutions (at ≤1,500 min⁻¹).
• Environmental Protection: IP54 rating (DIN EN 60529). Working temperature: 0°C … +60°C (option -20°C … +70°C).
• Robustness: Vibration ≤100 m/s² (50–2,000 Hz). Shock ≤1,000 m/s² (half-sine, 11 ms).
• Permissible Angular Acceleration: ≤10⁴ rad/s². Mass (typical): 1 kg.
• Storage Temperature: -30°C … +80°C (dry). Relative humidity: 98%, non-condensing.

Frequently Asked Questions (FAQ)

• Q: Does the controller need safety analysis? A: Yes, the cross-validation and safety analysis must happen within your controller.
• Q: Can I get a different incremental pulse count? A: Yes, rectangle (RS 422) options: 1,024 / 2,048 / 4,096 / 8,192 / 16,384 / 32,768 steps/rev.
• Q: What is the sign-of-life counter? A: It is a safed SSI protocol feature for monitoring communication integrity.
• Q: Is the encoder ready for SIL3 systems? A: Yes, the TR CDH75M-00001 fully complies with SIL3 and PL e standards.

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