Deltat ACC28B-A-D INTERFACE 24 AXIS

Product Brief Introduction

Rack-mounted standalone signal conversion interface hardware dedicated for large-scale multi-axis PMAC motion control systems. Translates low-level logic motion commands from PMAC mainframe into isolated differential step/direction drive signals for external servo and stepper power amplifiers. Simultaneously collects fault, ready, and limit feedback signals from all 24 drive axes, isolates electrical domains between controller and power drives, and distributes axis enable interlock signals for coordinated machine safety logic.
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Description

Technical Specifications

  • Supported Motion Axis Quantity: 24 fully independent servo/stepper axes
  • Command Output Format: Differential step pulse + differential direction signal per axis
  • Feedback Input Channels: 24 isolated digital fault/status input channels, sink/source jumper configurable
  • Axis Enable Outputs: 24 solid-state relay isolated enable/disable control outputs
  • Controller Communication Port: Dedicated differential multi-drop PMAC expansion bus
  • Nominal Operating Supply Voltage: 24 VDC; allowable operating range 18 VDC – 30 VDC
  • Full Load Power Consumption: Max 12 W under 24-axis simultaneous active operation
  • Operating Ambient Temperature Range: 0 °C to +55 °C cabinet operational; -40 °C to +85 °C storage
  • Channel Galvanic Isolation Rating: 2,500 VDC isolation between controller side and drive side per axis
  • Maximum Step Pulse Output Frequency: 1 MHz per individual axis command channel
  • Ingress Protection Grade: IP20 for standard enclosed control cabinet rack installation

Functional Features

  1. Full electrical isolation between PMAC low-voltage control logic and high-noise servo drive power circuits to eliminate ground loop burnout
  2. Independent differential step/direction signal generation for each of 24 axes with slew-rate signal shaping to reduce electromagnetic radiation
  3. Configurable sinking/sourcing digital fault input detection for universal compatibility with all industrial servo amplifier brands
  4. Hardware interlock logic that globally disables all axis drive outputs upon emergency stop input trigger
  5. Front panel individual LED status indicators for step pulse activity, direction state, drive fault, and axis enable status per axis
  6. Built-in surge suppression circuitry on all drive-side I/O terminals to absorb voltage transients from motor switching noise
  7. Jumper-selectable pull-up/pull-down resistors for matching external drive input impedance

Performance Parameters

  • Maximum aggregate step pulse throughput across all axes: 24 million pulses per second
  • Step signal propagation delay: ≤ 120 ns per axis output channel
  • Isolation dielectric withstand voltage: 2,500 VDC continuous for 60 seconds per channel barrier
  • Digital input response capture latency: ≤ 80 ns fault signal detection speed
  • Rated MTBF: 520,000 operating hours at +25 °C nominal cabinet temperature
  • Signal output drive capacity: 20 mA differential sourcing/sinking per command channel
  • Global emergency stop reaction time: ≤ 0.5 ms full axis disable execution

Material Composition

  • Main rack enclosure housing: UL94-V0 flame retardant black ABS plastic frame with steel internal reinforcement plate
  • Main printed circuit board: High noise immunity FR4 industrial fiberglass laminate
  • Isolation components: High-speed optocoupler galvanic isolation ICs for every axis signal path
  • I/O terminal blocks: Nickel-plated copper screw terminals with captive wire clamps
  • Front panel indicator hardware: High brightness long-life industrial LEDs
  • DIN rail mounting hardware: Corrosion resistant spring steel mounting clip
  • Surge protection components: Metal oxide varistors (MOV) and TVS transient suppression diodes

Structural Characteristics

  • Standard 19-inch rack compatible modular unit, 4U rack height form factor
  • Dual terminal block zones separated on front panel: controller bus wiring zone and 24-axis drive wiring zone
  • Dedicated external emergency stop hard-wire terminal port isolated from control bus signals
  • Internal PCB layout fully segregates low-voltage controller communication circuits and high-noise drive interface circuits via grounded shielding partitions
  • Integrated ventilation slotted side panels for passive convection cooling
  • Lockable terminal block wire ports to prevent loose wiring vibration failure during machine operation
  • Standard 35 mm EN 60715 DIN rail mounting support for cabinet installation without full 19-inch rack

Working Principle

Low-speed differential communication frames carrying motion trajectory step and direction commands transmit from PMAC motion controller through dedicated multi-drop bus to the ACC28B-A-D internal logic processor. On-board FPGA distributes decoded motion commands to isolated signal drivers for each axis, generating shaped differential step/direction pulse signals routed to external servo/stepper amplifiers. All 24 drive units return fault, ready, and limit switch digital feedback signals into isolated input circuits on the module. Optocoupler isolation barriers block common-mode voltage noise generated by motor drive switching semiconductors, preventing noise-induced motion position drift or controller hardware damage. Axis enable solid-state relay outputs receive global interlock logic signals from emergency stop circuits to cut drive activation power instantly during safety trigger events. Front panel LEDs continuously mirror real-time signal states for on-site equipment troubleshooting without software access to the PMAC controller.

Core Advantages

  1. Centralized 24-axis signal isolation architecture reduces quantity of separate signal isolation modules in multi-axis automation systems
  2. Universal sink/source digital input configuration compatible with all mainstream industrial servo drive brands
  3. Hardwired hardware emergency stop interlock independent of controller software logic to meet machine safety standard requirements
  4. Integrated surge and transient suppression eliminates external signal conditioning terminal blocks
  5. Dual mounting options (19-inch rack / DIN rail) flexible for compact and large control cabinet layouts
  6. Individual per-axis visual LED status drastically shortens wiring and drive fault diagnostic downtime

Applicable Industries

Large gantry automation systems, multi-station automotive assembly test rigs, multi-spindle precision CNC production lines, automated aerospace composite layup equipment, semiconductor panel transfer multi-axis robots, large-format laser cutting and engraving machinery, automated warehouse sorting multi-axis handling equipment

Installation Requirements

  1. Mount module inside IP54 or higher sealed industrial control cabinet only; outdoor unenclosed installation prohibited
  2. When using DIN rail mounting, retain minimum 20 mm vertical airflow clearance above and below unit
  3. For 19-inch rack installation, secure all four rack mounting lugs with M6 steel machine bolts at uniform torque of 3 N·m
  4. Run shielded twisted pair differential cabling for PMAC controller communication bus wiring; terminate shield drain wire to cabinet single-point ground bar
  5. All drive-side step/direction feedback wiring must use twisted pair shielded cable with shield grounded only at the ACC28B-A-D module terminal side
  6. Connect unit protective earth terminal to cabinet PE grounding busbar with minimum 1.5 mm² cross-section copper wire

Usage Precautions

  1. Do not operate module when cabinet ambient temperature exceeds +55 °C; excess temperature causes optocoupler timing drift and signal output failure
  2. Disconnect 24 VDC main power supply before modifying axis wiring or input/output jumper configurations
  3. Emergency stop hard wiring must run as dedicated independent cable, bundled separately from all motion signal cables to avoid noise interference
  4. Mechanical vibration exceeding 10 g continuous acceleration will loosen terminal block wire connections; install anti-vibration rack mounting pads for high-vibration production environments
  5. Do not connect unisolated mains voltage signals directly to any axis I/O terminals; all input signals must operate within 0–24 VDC logic voltage range
  6. Annual inspection of terminal block screw torque mandatory to prevent thermal overheating from loose wire contacts
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