Description

ACC‑24E2S 4‑Axis Motion Expansion Board

Technical Specifications

• Product Model: ACC‑24E2S
• Brand: Delta Tau
• Warranty: One Year
• Input Voltage: 5 VDC @ 0.9 A (±10 %) backplane supply
• Operating Temperature: 0 °C to +45 °C
• Storage Temperature: -25 °C to +70 °C
• Response Time: Synchronized axis update <1 µs via UBUS high‑speed backplane
• Protection Class: IP20 (3U Eurocard cabinet‑mount PCB assembly)
• Accuracy Class: ±1 count encoder position capture for closed‑loop motion
• Output Frequency: Pulse output up to 10 MHz per axis
• Rated Current Range: Logic‑level drive; no high‑power motor output on‑board
• Communication Interface: UBUS backplane bus; DB15 connectors; Phoenix terminal blocks
• Supported Protocols: PMAC2 UBUS internal motion bus; differential encoder signal
• Overload Capacity: ESD transient suppression; channel‑wise signal short‑circuit protection
• Dimensions: 162.6 mm × 100 mm × 20.3 mm (3U Eurocard format)

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Product Overview

The ACC‑24E2S is a PMAC2‑compatible four‑axis motion expansion board built for Delta Tau UMAC, Ultralite and MACRO‑Station motion‑control platforms. It delivers mixed‑mode axis interfaces supporting stepper pulse‑direction outputs, differential incremental encoder inputs and MLDT position‑sensor signal conditioning. High‑speed UBUS backplane connectivity transfers position commands and feedback data directly to the host motion CPU without intermediate conversion delays.

This hardware solves common multi‑axis motion‑system challenges: expanding axis count on legacy PMAC2 controllers, mixing stepper and encoder‑based feedback on the same control rack, and maintaining tight axis‑to‑axis synchronization for complex motion sequences. Each channel supports independent axis configuration, allowing flexible hardware setup for positioning, contouring and gantry‑style machine layouts. Motion‑system integrators, machine‑tool retrofit technicians and automation maintenance teams benefit most. It fits standard 3U rack slots, uses drop‑in mechanical form factor for spare‑part replacement, and removes custom signal‑conditioning work for production machinery such as cutting equipment, pick‑and‑place stations and automated assembly systems.

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Key Application Notes

• Requires compatible UMAC / Ultralite / MACRO‑Station main CPU; cannot operate as standalone motion controller
• Each axis can be configured for stepper drive output, encoder feedback or MLDT sensor input via on‑board jumpers
• Supports differential line‑driver encoder signals for noise‑resistant long‑cable field installations
• Does not output high‑power motor drive signals; must connect to external stepper or servo amplifiers
• Designed for control‑room cabinet‑only deployment; not for direct field‑hazardous‑area mounting
• Conformal coated PCB variants are available for cabinet environments with elevated humidity and airborne contaminants