TR CDH75M-00001 SIL Rotary Encoder for Safety Applications

Product Overview

The TR CDH75M-00001 is a high-precision SIL rotary encoder. This model serves critical safety functions in industrial automation. You can use this encoder for position feedback in demanding environments. The TR CDH75M-00001 combines a hollow shaft design with redundant detection systems. It meets the highest safety standards like SIL 3 and PL e.

Technical Specifications

Electrical Data

• The voltage supply range is 11 to 27 V DC.

• Current consumption at no load is below 150 mA at 24 V DC.

• The main measurement system uses a 25-bit capacitance.

• This model provides 8,192 steps per revolution.

• It supports 4,096 revolutions total.

Safety System Features

• The unit has two redundant detection systems with separate outputs.

• Mutual monitoring of microcontrollers occurs via CRC.

• A sign of life counter supports the safed SSI protocol.

• Cross validation and safety analysis must happen within your controller.

• The safety system also offers 25-bit capacitance with 8,192 steps per revolution and 4,096 revolutions.

Safety Standards

• Safety Integrity Level (SIL) meets SIL 3 per DIN EN 61508.

• Performance Level (PL) meets PL e per EN ISO 13849.

• The PFH for the complete system is 10×10⁻⁹ 1/h.

Mechanical Data

• The mechanically permissible speed is ≤ 3,000 min⁻¹.

• Shaft load only includes the dead weight of the rotary encoder.

• Bearing life reaches ≥ 3.9×10¹⁰ revolutions at ≤ 1,500 min⁻¹.

• Permissible angular acceleration is ≤ 10⁴ rad/s².

• The typical mass of this unit is 1 kg.

Environmental Conditions

• The protection class is IP 54 per DIN EN 60529.

• Working temperature ranges from 0 °C to +60 °C.

• An optional range of -20 °C to +70 °C is available.

• Relative humidity can reach 98% without condensation.

• Storage temperature is -30 °C to +80 °C in dry conditions.

• Vibration tolerance is ≤ 100 m/s² (sine, 50–2,000 Hz).

• Shock tolerance is ≤ 1,000 m/s² (half-sine, 11 ms).

• Emitted interference meets class B for industrial areas.

Interfaces and Protocols

• This encoder provides 2×SSI interfaces.

• The protocol uses CRC-safed data with additional information.

• Channel 1 transfers position, error bit, sign of life counter, and CRC.

• Channel 2 transfers position, sign of life counter, status bits, and CRC.

• The unsafe incremental interface supports A, A-, B, B- signals.

• Fixed pulse options for sine/cosine (1 Vss) are 1,024 or 4,096.

• Fixed pulse options for rectangle (RS 422) are 1,024, 2,048, 4,096, 8,192, 16,384, or 32,768.

• The code type is binary.

Order Information

• Order Number: CDH75M-00001

• Flange / Shaft: Hollow shaft 20 H7 with groove 5 JS9.

• The unit includes flange-sided attachment for rotation prevention.

• Connection: 2 cable glands with a removable connection cap.

• Unsafe Incremental Track: Rectangle (RS 422) with 4,096 steps per revolution.

• It uses signals K1, K2 and their inverses. Other options are available on request.

Installation Guidelines

• Mount the encoder on a clean, dry shaft.

• Use the flange-sided attachment to prevent rotation.

• Do not exceed the shaft load limit of the encoder’s own weight.

• Ensure the ambient temperature stays within the specified working range.

• Connect the two SSI interfaces to a safe controller for cross validation.

• Tighten the cable glands to maintain the IP 54 protection rating.

Package Contents

• TR CDH75M-00001 SIL rotary encoder unit (1 piece)

• Removable connection cap with two cable glands (pre-installed)

• Mounting screws for flange attachment

• Anti-rotation device bracket

• Quick start guide

Frequently Asked Questions (FAQ)

1. Does the TR CDH75M-00001 perform the safety analysis internally?
No, the cross validation and safety analysis must occur within your external controller. The encoder provides safed data via CRC and sign of life counters.

2. What is the difference between the two channels on this rotary encoder?
Channel 1 sends position, error bit, sign of life, and CRC. Channel 2 sends position, sign of life, status bits, and CRC for redundant monitoring.

3. Can I use this TR CDH75M-00001 model at very low temperatures?
Yes, the standard range is 0 °C to +60 °C. An optional version supports -20 °C to +70 °C. Please request this option when ordering.

4. How many steps per revolution does the unsafe incremental track provide?
The standard rectangle (RS 422) track provides 4,096 steps per revolution. You can request other fixed pulse counts from 1,024 up to 32,768.

5. What happens if the bearing life reaches its limit?
The rated bearing life is ≥ 3.9×10¹⁰ revolutions at ≤ 1,500 min⁻¹. Regular maintenance checks are recommended after this limit.