Deltat ACC-24E2S

Technical Specifications

• Independent Encoder Feedback Axis Count: 24 differential digital quadrature input channels
• Supported Encoder Signal Standard: High-speed short-pulse differential A/B/Z line driver quadrature signals
• Maximum Single Channel Input Frequency: 16 MHz ultra-high frequency pulse processing rating
• Host Platform Compatibility: PMAC, PMAC-2, PMAC-3 all-generation motion control mainframes
• Logic Operating Supply Voltage: 5 VDC sourced from PMAC internal expansion backplane
• Operating Ambient Temperature Range: 0 °C to +60 °C industrial control cabinet environment
• Per-Axis Channel Galvanic Isolation Rating: 1,500 VDC optocoupler dielectric isolation
• Position Counter Hardware Resolution: 32-bit quadrature accumulator per independent motion axis

Functional Features

1. High-speed short-pulse signal conditioning circuits supporting 16 MHz maximum encoder pulse frequency
2. Grouped configurable differential line termination DIP switch arrays for matched cable impedance tuning
3. Hardware index pulse capture latch registers for fast high-speed spindle homing and referencing cycles
4. Per-channel group hardware loss-of-encoder-signal fault detection with front panel LED visual status indication
5. Optimized FPGA timing logic minimizing pulse capture skew at maximum high-frequency pulse rates

Performance Parameters

• Aggregate maximum quadrature edge processing throughput: 152 million edges per second full card load
• Channel-to-channel pulse capture skew matching: ≤ 30 ns propagation delay deviation at 16 MHz input frequency
• Per-axis channel continuous dielectric isolation withstand voltage: 1,500 VDC
• Automatic counter rollover logic preserving continuous absolute position tracking data
• Rated MTBF: 540,000 operating hours at nominal +25 °C cabinet ambient temperature
• Minimum detectable index pulse width: 60 ns ultra-short pulse hardware trigger threshold

Material Composition

• Circuit board substrate: Low signal skew high-frequency FR4 industrial PCB laminate
• High-speed signal isolation hardware: Ultra-fast response linear optocoupler ICs
• Front panel multi-channel wiring headers: Gold-plated low-inductance pin terminal blocks
• Mechanical configuration hardware: Low-capacitance gold contact DIP switch bank arrays
• Chassis mounting enclosure panel: EMC shielding cold-rolled steel front bracket

Structural Characteristics

• Interchangeable mechanical footprint matching ACC-24E2 and ACC-24E2A PMAC expansion cards
• Dual front panel multi-pin terminal headers partitioned into three separate 8-axis channel groups
• Front panel grouped LED indicator arrays for power, backplane communication, and channel group signal loss faults
• Standard edge connector mating interface fully compatible with all PMAC series backplane expansion slots
• Optimized short trace PCB routing architecture to eliminate high-frequency signal cross-talk interference

Working Principle

Core Advantages

1. Doubled maximum single-channel encoder frequency rating compared to standard ACC-24E2 base model hardware
2. Minimized channel-to-channel timing skew maintaining position synchronization on multi-spindle high-speed machinery
3. Ultra-short index pulse detection capability compatible with compact high-RPM spindle encoder transducers
4. Direct mechanical drop-in replacement for ACC-24E2 without chassis or wiring harness modification
5. High aggregate pulse throughput eliminating multi-card expansion requirements for multi-spindle production equipment

Applicable Industries

Installation Requirements

1. Perform complete PMAC mainframe power shutdown prior to ACC-24E2S card insertion or removal operations
2. Precisely align backplane edge connector pins with PMAC expansion slot receptacles to avoid pin bending damage
3. Secure steel front panel mounting bracket to controller chassis with factory standardized screw torque value
4. Adjust grouped DIP switch termination resistance settings to match differential impedance of high-frequency encoder cabling
5. Deploy high-frequency low-capacitance shielded twisted pair wiring for all encoder feedback channel connections

Usage Precautions

1. Cabinet ambient temperature exceeding +60 °C induces FPGA timing drift and high-frequency pulse capture errors
2. All high-speed encoder cable shielding must terminate to single-point chassis ground to block radio frequency interference
3. Signal loss fault events require full spindle/axis re-homing calibration procedures for affected channel groups
4. Maintain strict physical separation between high-frequency encoder wiring and variable frequency drive power cabling
5. Execute full PMAC mainframe power cycle after modification of on-card DIP switch termination configuration values