Deltat ACC-24E2A

Product Brief Introduction

Enhanced variant of ACC-24E2 base encoder expansion card optimized for high-precision analog sine/cosine rotary and linear encoder transducers. Delivers 24 combined analog sine/cosine and digital quadrature encoder input channels for ultra-high resolution precision motion control systems, optical grating positioning stages, and high-accuracy CNC machine spindle feedback applications. Integrates on-board analog signal amplification and interpolation circuits absent from standard ACC-24E2 hardware.
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Description

Technical Specifications

  • Total Encoder Axis Channels: 24 mixed analog sine/cosine + digital A/B/Z quadrature input channels
  • Analog Encoder Input Standard: 1 Vpp differential sine/cosine analog position signals
  • Digital Quadrature Signal Support: Differential line driver A/B/Z index pulse signals
  • Built-In Analog Interpolation Multiplier: 4096x on-card hardware sine/cosine signal interpolation
  • Maximum Channel Input Frequency (Digital): 8 MHz per axis; analog sine/cosine carrier up to 250 kHz
  • Host Compatibility: PMAC, PMAC-2, PMAC-3 industrial motion control mainframes
  • Logic Supply Power: 5 VDC from PMAC internal backplane bus
  • Operating Temperature Range: 0 °C to +60 °C industrial cabinet ambient temperature
  • Channel Isolation Rating: 1,500 VDC galvanic optocoupler isolation per individual axis channel
  • Position Counter Resolution: 48-bit combined interpolated hardware position accumulator per axis

Functional Features

  1. On-board analog front-end amplification and 4096x sine/cosine interpolation sub-dividing analog encoder cycles
  2. Combined simultaneous processing of analog sine/cosine and digital index Z marker pulses per axis
  3. Group-configurable differential line termination DIP switch arrays for digital encoder channels
  4. Hardware index pulse latch registers for ultra-precise absolute axis homing calibration
  5. Per-group analog signal amplitude loss and digital signal loss dual fault detection circuits

Performance Parameters

  • Aggregate maximum quadrature edge processing throughput: 76 million edges per second digital domain
  • Analog sine/cosine interpolation resolution: 0.000244 degree incremental position step per encoder cycle
  • Channel-to-channel signal skew matching: ≤ 50 ns propagation delay deviation
  • Per-axis channel dielectric isolation withstand voltage: 1,500 VDC continuous rating
  • Rated MTBF: 550,000 operating hours at standard +25 °C cabinet ambient temperature
  • Minimum detectable analog signal amplitude threshold: 50 mV differential sine/cosine input

Material Composition

  • Main circuit substrate: High precision FR4 low-distortion industrial laminate PCB
  • Analog signal processing hardware: Low-noise operational amplifier ICs and analog interpolation FPGA
  • Signal isolation components: Linear high-speed optocoupler isolation integrated circuits
  • Front panel multi-channel wiring headers: Gold-plated corrosion-resistant pin connectors
  • Mechanical configuration hardware: Gold contact DIP switch bank arrays
  • Chassis mounting front panel: EMC shielding cold-rolled steel bracket

Structural Characteristics

  • Standard PMAC internal expansion card form factor matching ACC-24E2 mechanical footprint
  • Dual front panel multi-pin terminal headers segregated into three independent 8-axis channel groups
  • Front panel dual-status LED arrays: power/bus communication status, analog/digital signal fault per group
  • Direct edge connector mating interface compatible with all PMAC series backplane expansion slots
  • Dedicated isolated analog signal layer in PCB stack-up to eliminate digital cross-talk noise

Working Principle

Analog sine/cosine differential position signals from high-resolution optical encoders enter dedicated analog front-end circuits on the card. Low-noise operational amplifiers normalize analog signal amplitude, and on-board interpolation FPGA executes 4096x sub-cycle position subdivision to generate ultra-fine incremental position counts. Digital A/B/Z quadrature signals route through optocoupler isolation circuits identical to ACC-24E2 hardware. Combined interpolated analog position data and digital index pulse timing values feed into 48-bit hardware position accumulators for each of the 24 axes. The PMAC mainframe motion controller accesses full high-resolution position register datasets via the expansion backplane bus to execute ultra-precise closed-loop motion control algorithms for nanometer-grade positioning equipment.

Core Advantages

  1. Native hardware support for high-resolution analog sine/cosine encoders with integrated 4096x interpolation eliminating external interpolation modules
  2. 48-bit high-capacity position accumulators eliminating position overflow on long-travel linear positioning stages
  3. Dual analog/digital signal fault detection enabling early predictive maintenance of precision encoder hardware
  4. Identical mechanical form factor to ACC-24E2 allowing direct drop-in field replacement without chassis modification
  5. Isolated analog signal PCB layer eliminating digital switching noise contamination of low-amplitude analog position signals

Applicable Industries

Ultra-precision semiconductor lithography positioning stages, coordinate measuring machines (CMM), high-precision optical inspection equipment, aerospace precision component CNC machining, medical device micro-manufacturing automation, laser micro-processing positioning systems

Installation Requirements

  1. Cut full mainframe power supply before inserting or removing ACC-24E2A expansion card hardware
  2. Align backplane edge connector pins precisely with PMAC expansion slot receptacles to prevent pin damage
  3. Secure steel front panel mounting bracket to controller chassis with factory specified screw torque value
  4. Adjust DIP switch termination groups exclusively for digital encoder wiring impedance matching; analog channels feature fixed internal termination
  5. Deploy double-shielded twisted pair cabling for all analog sine/cosine encoder wiring runs

Usage Precautions

  1. Ambient cabinet temperature exceeding +60 °C introduces analog amplifier thermal drift and position resolution degradation
  2. Analog encoder cable shielding must terminate to single-point chassis ground to block external electromagnetic noise
  3. Analog signal amplitude fault triggers require inspection of encoder transducer wiring and light source hardware
  4. Strict physical separation mandatory between analog encoder cabling and high-power variable frequency drive motor wiring
  5. Full PMAC mainframe power cycle required after modification of on-card DIP switch digital termination settings
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