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Key Technical Specifications
| Parameter | Specification |
| Model Code | ACC-51E / 3×0-603383-10x |
| Channel Density | 4 differential sinusoidal encoder input channels |
| Input Signal Type | Nominal 1 Vpp differential (Sin, Cos, Index) |
| Interpolation Factor | Software/Hardware selectable up to 4096x per line cycle |
| Maximum Frequency | Up to 800 kHz sinusoidal input signal rate |
| Output Signal Format | Internal digital quadrature signal fed to host PMAC DSP via sub-bus |
| Encoder Power Output | Integrated 5 V DC supply outputs for external optical/magnetic encoders |
| System Bus Interface | 3U CompactPCI bus interface (UMAC rack backplane) |
| Power Consumption | +5 V DC (backplane supply), ±15 V DC for high-precision analog front-end |
| 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-51E serves as a 4-axis high-resolution interpolator module for UMAC and Power PMAC motion controllers, converting 1 Vpp analog sine/cosine feedback signals into sub-nanometer quadrature counts for ultra-precision positioning systems.
Securing a genuine New Surplus ACC-51E for your local buffer stock mitigates severe total cost of ownership (TCO) risks caused by feedback processor failure. Second-hand or repaired interpolator cards frequently suffer from drifted analog-to-digital converters (ADCs), signal gain imbalance, and thermal noise degradation that introduce position ripple. Holding factory-sealed inventory on-site guarantees full 10 to 15 year operational longevity, preventing $50,000 per hour unplanned line outages during hardware replacements.
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 (gain selection, bias trimming, and sub-bus interface addresses) on the active board.
Stage 2: Removal
- Unbolt the high-density DB25/DB15 feedback 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 handles outward evenly and slide the ACC-51E straight out along the guide tracks.
Stage 3: Installation (Clone & Seat)
- Match all jumpers and SW1 address selection switches on the replacement ACC-51E 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 sinusoidal encoder feedback cables to their designated interface headers.
- Apply logic power to the UMAC rack and open PEWIN32PRO / IDE terminal software.
- Monitor real-time Lissajous patterns (
SinvsCosgain balance), verify index mark detection, and check for signal loss error flags before enabling closed-loop servo control.
ACC-51E
ACC-51E
Firmware/Software Versions & Upgrade Notes
- System Compatibility: Native integration with Delta Tau Turbo PMAC, UMAC, and Power PMAC 3U rack architectures via sub-bus interconnects.
- Gain and Offset Calibration: High-precision interpolator setups require software setup registers (such as
Ixx83/Ixx84gain and offset correction registers) to match the exact output voltage levels of the connected encoder head. - Upgrade/Downgrade Warning: Swapping hardware jumper options without adjusting software interpolation multiplier settings will cause severe position error scaling mismatches, resulting in immediate axis runaway or instability. Always verify feedback parameters 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 interpolator cards are cheap because they carry high failure risks from drifted analog front-end components and noisy signal paths. Our New Surplus stock provides original OEM quality at a fraction of factory list price.
Q: Is this Delta Tau ACC-51E 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 electrical transients from damaging sensitive high-speed ADC circuitry.
Q: Does this board support standard TTL digital quadrature encoders?
A: No. The is specifically designed for 1 Vpp analog sinusoidal encoders. For standard RS-422 TTL quadrature feedback, use standard axis cards like the ACC-24E2A or ACC-24E3.
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.
