Delta Tau ACC-24E2S-DB | 4-Axis Pulse/Direction Interface Board, In Stock
Delta Tau ACC-24E2S-DB | 4-Axis Pulse/Direction Interface Board, In Stock - Image 2
Delta Tau ACC-24E2S-DB | 4-Axis Pulse/Direction Interface Board, In Stock - Image 3

Delta Tau ACC-24E2S-DB | 4-Axis Pulse/Direction Interface Board, In Stock

  • Model: ACC-24E2S-DB
  • Brand: Delta Tau Data Systems (now under Omron)
  • Series: ACC-24E2x UMAC accessory board family
  • Core Function: Provides 4-axis pulse-and-direction plus encoder feedback interface for UMAC motion controllers, translating PMAC servo commands into step/dir signals for stepper or pulse-type servo drives.
  • Type: 4-axis pulse/direction + encoder interface board (ACC-24E2S variant)
  • Key Specs: 4 servo channels; pulse-and-direction outputs; differential/single-ended encoder inputs; DB connector termination; UMAC rack mount.
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Description

Key Technical Specifications

Parameter Typical / Verified Value
Full part number ACC-24E2S-DB
Manufacturer Delta Tau Data Systems
Product type 4-axis pulse/direction + encoder interface board
DCS family UMAC / PMAC2-style
Axis count 4 channels
Output command Pulse and direction
Encoder inputs 3-channel differential/single-ended per axis
Termination DB connector (DB-style)
Mounting UMAC rack, backplane
Power source From UMAC backplane
Final specs Confirm with OEM label and assembly number

 

Product Introduction

UMAC racks do not forgive mismatched axis boards. When a pulse-and-direction card dies on a multi-axis machine, the last thing you want is a replacement that physically fits but maps encoder channels differently. The ACC-24E2S-DB is the DB-connector variant of Delta Tau’s ACC-24E2S, a 4-axis interface board that converts PMAC servo calculations into pulse-and-direction commands for stepper drives or pulse-type servo amplifiers.Engineers keep this board in spares inventory because it is predictable: four channels, encoder feedback per axis, flag I/O, and DB termination that matches existing cable harnesses. The “-DB” suffix typically indicates the DB connector version rather than the terminal-block variant. I would never install one without confirming the assembly number and verifying that the encoder input polarity matches the original.

Quality SOP & Tech Pitfalls

The Lab Report (SOP)

  1. Visual inspection: check for cracked DB connector housings, bent pins, corrosion, or reworked labels.
  2. Label verification: confirm ACC-24E2S-DB, assembly number, revision, and date code.
  3. Backplane pin inspection for bent or recessed contacts.
  4. Continuity check on DB connector pins against the ACC-24E2S pinout.
  5. Bench test on a known-good UMAC rack; verify pulse/dir outputs with an oscilloscope.
  6. Encoder input test with a simulated quadrature source.
  7. Anti-static bag, foam support, and sealed dispatch label.

The Engineer’s Warning (Pitfalls)The most common mistake is confusing ACC-24E2S with ACC-24E2A. The E2A is analog ±10 V; the E2S is pulse-and-direction. They are not interchangeable without reprogramming and rewiring. I have seen a tech plug an E2S into a system configured for analog drives and wonder why nothing moved. Also, check the encoder input polarity. Reversed A/B channels will cause following errors that look like mechanical backlash but are actually a wiring problem.

Installation & Configuration Guide

  1. Pre-Installation
    • Follow plant LOTO and control system change procedures.
    • Photograph the existing board label, DB connector wiring, and encoder pinout.
    • ️ Do not insert or remove UMAC boards while the rack is energized unless the OEM procedure explicitly allows it.
  2. Removal
    • Document the slot position and board orientation.
    • Release the retaining hardware.
    • Withdraw the board straight out to avoid bending backplane pins.
  3. Installation
    • Copy all jumper settings, encoder polarity, and pulse/dir configuration from the old board.
    • Inspect the DB connector for bent pins before mating cables.
    • Seat the board firmly and verify mechanical retention.
  4. Power-On & Testing
    • Verify UMAC rack power and board status LEDs.
    • Check pulse/dir output with an oscilloscope or drive monitor.
    • Verify encoder feedback counts and direction.
    • Run a low-speed jog test before returning to full production.

Compatible Replacement Models

Compatibility Candidate Notes
Drop-in Delta Tau ACC-24E2S-DB with matching assembly number Exact match; confirm revision and DB pinout
️ Verify first ACC-24E2S (terminal-block variant) Same function but different connector; may require rewiring
️ Engineered swap ACC-24E2A (analog ±10 V variant) Different output type; requires drive and program changes
Not recommended ACC-24E2 (PWM variant) PWM output; not compatible with pulse/dir drives

 

Frequently Asked Questions (FAQ)

Is ACC-24E2S-DB still in production?
Likely legacy. Delta Tau UMAC accessories are commonly sourced as surplus or from existing plant spares.Can I hot-swap this board?
Not by default. Treat it as a de-energized replacement unless your UMAC procedure explicitly supports live insertion.What is the difference between ACC-24E2S and ACC-24E2A?
E2S outputs pulse-and-direction signals; E2A outputs analog ±10 V. They serve different drive types and are not drop-in replacements for each other.What does the “-DB” suffix mean?
It typically indicates the DB connector termination version. Confirm against the physical label and OEM documentation.Can I use it with any servo drive?
Only with drives that accept pulse-and-direction commands. Analog ±10 V drives require the ACC-24E2A variant instead.Does it need special configuration?
Yes. The PMAC motor definition, encoder input polarity, and pulse/dir scaling must match the original. Otherwise you will get following errors or reversed motion.What warranty is reasonable?
For legacy UMAC boards, expect a supplier test report, label photos, and at least a 12-month warranty.

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