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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Specification |
| Model Code | ACC-24E2A |
| Axis Count | 2 axes per board (expandable via stacked configurations) |
| Analog Command Outputs | 2 channels, 16-bit resolution, ±10 V DC output |
| Encoder Feedback Inputs | 2 differential channels (A, B, Index), RS-422 differential line driver |
| Encoder Input Frequency | Up to 10 MHz maximum line rate |
| Auxiliary I/O per Axis | Dedicated Flag Inputs (Home, Positive Limit, Negative Limit, User) |
| Amplifier Control Signals | Differential Amplifier Enable output, Fault Input per axis |
| System Bus Interface | 3U CompactPCI bus interface (UMAC rack backplane) |
| Power Requirements | +5 V DC (backplane), ±15 V DC (analog section from backplane supply) |
| Operating Temperature | 0 to 45 °C (32 to 113 °F) |
Product Introduction & Supply Chain Strategy
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Delta Tau ACC-24E2A serves as a 2-axis analog servo interface board for UMAC and Power PMAC motion controllers, delivering high-speed ±10 V closed-loop control for drives, galvo scanners, and precision stages.
Securing a genuine New Surplus ACC-24E2A for your local buffer stock mitigates severe total cost of ownership (TCO) risks caused by legacy motion hardware failures. Second-hand or repaired servo cards frequently suffer from drifted operational amplifiers, degraded DAC outputs, and micro-cracks in backplane headers caused by past thermal stress. Holding factory-sealed inventory on-site guarantees full 10 to 15 year operational longevity, preventing $50,000 per hour unplanned machine tool outages.
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Enforce strict Lock-Out/Tag-Out (LOTO) protocols on the UMAC rack power supply and main motor drives.
- Put on a grounded ESD wrist strap before handling the circuit card assembly.
- Record all hardware jumper configurations (J1–J10 jumper blocks for DAC scaling, encoder supply, and flag pull-ups) on the active board.
Stage 2: Removal
- Unbolt the high-density DB25/DB15 breakout cables attached to the front faceplate.
- Unscrew the top and bottom 3U CompactPCI card retaining screws on the UMAC chassis faceplate.
- Pull the card extraction levers outward evenly and slide the ACC-24E2A straight out along the guide tracks.
Stage 3: Installation (Clone & Seat)
- Match all jumpers and SW1/SW2 address selection switches on the replacement ACC-24E2A to match the original unit exactly.
- Align the card edges with the targeted UMAC slot guides and slide the module inward until backplane connectors contact.
- Press the card extraction handles inward firmly to fully engage the CompactPCI backplane, then tighten the retaining screws.
Stage 4: Power-On & Testing
- Reconnect all encoder feedback and amplifier command interface harnesses.
- Apply logic power to the UMAC rack and open PEWIN32PRO / IDE terminal software.
- Verify backplane communication by issuing card status queries (
Ixx05encoder register checks), verify flag states, and test DAC zero-drift output before enabling drive power.
ACC-24E2A
ACC-24E2A
Firmware/Software Versions & Upgrade Notes
- System Compatibility: Native integration with Delta Tau Turbo PMAC, UMAC, and Power PMAC 3U rack architectures.
- Ixx05 Register Addressing: Ensure the base address jumpers on the ACC-24E2A align with the motor memory mapping defined in your
.pmcor.projstartup script. - Upgrade/Downgrade Warning: Swapping hardware jumper options (such as changing encoder input termination or differential flag voltage levels) without updating motion software definitions can cause immediate runaway axis motion or encoder loss faults. Always verify jumper positions prior to enabling drive power.
Frequently Asked Questions (FAQ)
Q: Why is your New Surplus pricing lower than OEM direct, but higher than refurbished options?
A: Our pricing reflects the global procurement cost of securing genuine, unused inventory. Refurbished motion cards are cheap because they carry high failure risks from drifted analog components and worn backplane connectors. Our New Surplus stock provides original OEM quality at a fraction of factory list price.
Q: Is this Delta Tau card truly unused?
A: Yes. Every unit is brand-new, stored in anti-static ESD shielding, and features pristine gold edge-connector pins with zero rail scoring. Packaging is opened solely for visual inspection and anti-counterfeit verification.
Q: Can I hot-swap the module in the UMAC rack while powered?
A: No. The UMAC CompactPCI backplane must be completely powered down before removing or inserting expansion cards to prevent voltage spikes from damaging sensitivity-critical DAC chips.
Q: Does this board support sinusoidal or SSI absolute encoder feedback directly?
A: Standard inputs accept differential quadrature (RS-422) signals. Processing sinusoidal (1Vpp) or SSI absolute encoders requires a companion interpolation board (such as ACC-51E or ACC-84E) routed via the sub-bus.
Q: What warranty coverage comes with this module?
A: We provide a full 1-year replacement warranty on all New Surplus modules, covering complete functional operation under standard industrial operating conditions.
