Technical Specifications
- Form Factor: 3U Eurocard VME rack card
- Analog Input Channels: 16 switchable single-ended / differential input channels
- ADC Resolution: 12-bit full scale conversion precision
- Input Voltage Range: Fixed ±10 V DC bipolar analog input
- Maximum Sampling Rate: 1 MHz per independent channel; system aggregate conversion speed 200 kHz
- Isolation Grade: Channel-to-backplane isolation 1500 V AC dielectric withstand
- Backplane Bus Interface: UBUS proprietary backplane expansion port
- Onboard Memory: 8 KB hardware signal data buffer SRAM
- Power Consumption: 12 W maximum operating power
- Operating Voltage: +5 V DC backplane power supply
- Physical Dimensions: 160 mm (H) × 100 mm (W) × 35 mm (D)
- Net Weight: 180 g
Functional Features
- Supports dual input modes: single-ended voltage sampling and differential anti-interference sampling
- Onboard hardware signal conditioning circuit for analog noise filtering
- Independent channel trigger control for synchronous multi-point signal capture
- Hardware FIFO buffer eliminates data loss during high-speed sampling
- Built-in overvoltage, reverse polarity and ESD surge protection for all analog input terminals
- Terminal block and P3 industrial connector dual wiring options for field deployment
- Direct servo feedback signal acquisition for torque, velocity and position analog transducers
Performance Parameters
- Conversion linearity error: ≤ ±0.05% FS
- Full scale offset drift: ≤ 1 mV per 10 °C temperature change
- Input impedance: 10 MΩ per analog channel
- Crosstalk between adjacent channels: ≤ -72 dB
- Maximum input overvoltage tolerance: ±15 V DC continuous
- Operating temperature range: 0 °C ~ +55 °C
- Storage temperature range: -40 °C ~ +85 °C
Material Composition
- Main PCB substrate: FR-4 flame-retardant industrial circuit board
- Front panel: Cold-rolled steel with matte black electrostatic anti-corrosion coating
- Signal connector terminals: Gold-plated phosphor bronze alloy
- Enclosure hardware: Nickel-plated stainless steel fixing screws
- Isolation components: High-voltage optocoupler isolation chips, ceramic signal filter capacitors
Structural Characteristics
- Standard 3U vertical rack plug-in structure with locking ejector latches on front panel
- Dual wiring ports (terminal block + P3 multi-pin connector) on card edge
- Dedicated backplane UBUS gold finger contact strip at rear edge
- Independent channel signal separation layout on PCB to reduce crosstalk interference
- Front panel LED indicator array for power status, sampling running, fault alarm
Working Principle
Field analog voltage signals enter onboard signal conditioning circuits to suppress high-frequency interference, then pass through isolated 12-bit ADC conversion chips to convert analog voltage into 12-bit binary digital values. Converted digital data is temporarily stored in hardware FIFO buffer, then transmitted to PMAC main controller via UBUS backplane bus in real-time synchronous transmission mode. The controller processes sampled digital data to implement closed-loop motion adjustment, parameter monitoring and abnormal signal judgment logic.
Advantage Highlights
- High-speed multi-channel synchronous sampling meets high dynamic servo control signal acquisition demands
- Differential input design eliminates industrial electromagnetic interference from power cables and drive equipment
- Backplane direct plug-in installation without external power adapter, simplifying cabinet wiring
- Hardware buffer architecture ensures zero data packet loss under full-load maximum sampling rate
- Full electrical isolation between analog field side and control system backplane to avoid ground loop damage
- Native compatibility with all Delta Tau PMAC motion programming environments without additional driver development
Applicable Industries
Precision CNC machine tool manufacturing, semiconductor wafer processing equipment, automated robotic production lines, aerospace motion test benches, precision optical inspection equipment, automotive assembly automation, hydraulic servo test systems
Product Series
Delta Tau ACC Analog Acquisition Card Series (ACC-36E, ACC-28E, ACC-24E)
Installation Requirements
- Install only into standard 19-inch industrial VME 3U rack slots with UBUS backplane
- Insert card vertically until ejector latches fully lock front panel to avoid loose gold finger contact
- All analog signal wiring must use shielded twisted pair cables; shield layer single-point grounded at cabinet ground bar
- Maintain minimum 15 mm air gap between adjacent cards for heat dissipation
- Confirm backplane +5 V DC power output meets 12 W peak power supply capacity before power-on
Use & Maintenance Precautions
- Strictly prohibit input voltage exceeding ±15 V DC on analog terminals; overvoltage will permanently damage ADC chips
- Complete power-off operation before plugging/unplugging the board to prevent backplane surge current breakdown
- Regularly clean front panel ventilation slits every 6 months to avoid dust accumulation causing overheating
- Avoid installation in environments with oil mist, corrosive gas or relative humidity above 80% non-condensing
- All signal ground terminals must connect to independent cabinet protective ground, cannot share power neutral wire
- Stop sampling function before disconnecting field sensor wiring to eliminate instantaneous signal surge
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