Product Short Description
Product Name
Hitachi H-7626-35C Absolute Rotary Position Encoder for Servo Drives
Product Brief Introduction
High-resolution absolute rotary encoder exclusively matched to Hitachi medium-power AC servo motor systems, provides real-time rotor absolute position feedback for closed-loop motion control without power-loss zero offset loss.
Description
Technical Specifications
- Signal Output Format: Serial absolute multi-turn position signal
- Resolution per Revolution: High precision fine segmentation internal grating
- Power Supply Voltage: 5V DC ±5% stabilized input
- Operating Current Consumption: Max 120mA
- Mechanical Shaft Interface: Hollow shaft motor rear flange mounting type
- Model Suffix C: Industrial standard temperature grade variant
- Max Rotational Speed: 8,000 RPM continuous operation
- Communication Protocol: Hitachi proprietary servo encoder serial bus
Functional Features
- Multi-turn absolute position storage without external backup battery
- Real-time rotor angle feedback for high dynamic servo speed regulation
- Built-in electromagnetic interference shielding circuit for cabinet EMC environment
- Over-speed mechanical limit protection to prevent grating disc damage
- Integrated fault signal output for drive system diagnostic alarm
Performance Parameters
- Operating temperature range: -30°C ~ +85°C
- Vibration resistance: 10–2000Hz, 100m/s² three-axis vibration withstand
- Shock resistance: 1000m/s² 6ms single pulse shock tolerance
- Position repeatability: ±1 arcsecond angular precision
- Service life: 50,000 hours continuous rated rotation
- IP protection grade: IP64 sealed encoder housing
Material Composition
- Outer casing: Die-cast aluminum alloy with anti-corrosion anodized coating
- Grating disc: Ultra-flat optical glass with chromium precision etched code track
- Internal circuit board: FR4 high-temperature resistant PCB with gold-plated signal pins
- Shaft sealing ring: Fluorosilicone rubber oil-proof dust-proof seal
- Optical receiver module: Silicon photodiode array integrated chip
Structural Characteristics
- Compact cylindrical rear-motor flange mounting structure
- Central hollow shaft coaxial fit with servo motor rotor shaft
- Integrated single cable outlet for power and signal combined transmission
- Internal fully sealed optical cavity isolated from motor grease and dust
Working Principle
LED light source penetrates precision glass grating disc with absolute binary code tracks; photoelectric receiving array converts light and dark code signals into digital serial data; internal non-volatile memory stores multi-turn rotation count data to retain absolute position after full power cut-off; serial digital signal transmits rotor angle to servo drive for closed-loop vector control.
Advantage Highlights
- Battery-free multi-turn absolute positioning eliminates regular battery replacement maintenance
- Wide temperature grade C variant stable operation in cold workshop and high-temperature equipment enclosures
- High vibration and shock resistance suitable for stamping, cutting high-load motion equipment
- Integrated EMC filter circuit eliminates servo drive high-frequency switching noise interference
- Direct plug-and-match compatibility with Hitachi standard servo motor series
Applicable Industries
CNC machine tools, automated assembly lines, metal stamping equipment, injection molding servo axes, semiconductor wafer handling robots, packaging high-speed positioning machinery
Installation Requirements
- Coaxial concentricity error between motor rotor and encoder hollow shaft less than 0.02mm
- Fix mounting flange bolts with specified 4 N·m uniform torque to avoid housing deformation
- Signal cable routing separated 200mm minimum from power drive cables to prevent EMI
- Cable bending radius maintained above 10 times cable outer diameter
Operation & Maintenance Precautions
- Never disassemble sealed optical cavity, dust contamination will permanently damage grating disc
- Avoid direct impact on encoder housing during motor disassembly
- Do not use solvent chemical cleaners on encoder outer aluminum surface
- If position fault alarm occurs, inspect cable pin crimp integrity first before encoder replacement
- Avoid prolonged exposure to oil mist environment without auxiliary protective shield
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