Description:
The 2UBA002322R0018 is an ABB OEM capacitance plate / EMC capacitor mounting plate (also referred to as a collector plate or RFI suppression plate) used inside ABB low-voltage AC drive enclosures (ACS800, ACS880, and certain ACS510/550 frames) and MNS / MCC power sections. It is a precision-formed, tin-plated copper or aluminum alloy plate that either mounts the EMC/RFI Y-capacitors to the drive chassis (for conducted emission suppression) or serves as a laminated collector/distribution plate for DC busbars, ensuring correct stray capacitance to ground and equipotential bonding per ABB’s EMC design requirements.h2 Application Scenarios:A food-processing plant was upgrading its packaging line drives to ABB ACS880-01 units. During a pre-commissioning inspection, the installer noticed that one drive—received as a refurbished open-frame unit—was missing the small internal EMC capacitor plate that normally bolts to the heat sink near the power terminal block. Without the 2UBA002322R0018 plate (and its attached Y-capacitors or capacitive coupling surface), the drive would fail CE-conducted-emission compliance and risk nuisance tripping on the site’s sensitive GFCI-protected branch circuit. The maintenance electrician sourced the correct 2UBA002322R0018, bolted it to the designated tapped holes on the drive chassis using the original M4 screws and star washers (ensuring gas-tight contact), and reconnected the capacitor leads to the PE / DC- bus as shown in the drive’s internal wiring diagram. A handheld EMC sniffer confirmed the high-frequency common-mode noise dropped by > 15 dBµV, and the drive passed site acceptance testing without issue. The project engineer remarked that “the little plate you don’t see is what keeps the big drive from causing radio hash on the rest of the plant—having the exact ABB part number mattered.”h2
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 2UBA002322R0018 |
| Manufacturer | ABB (Drives / Low Voltage Products Division) |
| Product Category | Capacitance Plate / EMC Capacitor Mounting Plate / Collector Plate (Drive Internal Spare) |
| Typical Material | Tin-plated copper or aluminum alloy (0.8–1.5 mm thickness, FR4 riveted in some combi-plates) |
| Function | Provides defined stray capacitance to PE for RFI suppression OR acts as laminated DC+/DC− collector in power section |
| Mounting Pattern | Pre-drilled / punched to match ACS800 / ACS880 frame-specific chassis (typically 2–4 × M4 clearance holes) |
| Surface Finish | Bright tin or nickel flash (corrosion-resistant, low-contact resistance to chassis) |
| Capacitance (if plate-only, no caps) | Stray capacitance ≈ 20–100 pF to grounded heatsink (design-intent value for EMC tuning) |
| Associated Components | May include pre-installed Y-capacitors (X2/Y2 class, 2.2 nF typical) or be ordered separately — verify if caps are on your removed plate |
| Dimensions (approx.) | 60 × 40 × 1.2 mm (typical for ACS880 R1–R3 frames; confirm against removed part) |
| Operating Temp. | -40 °C to +105 °C (plate only; capacitor rating governs if populated) |
| Installation Location | Inside drive enclosure — bolted to designated location on heatsink / side panel / busbar support bracket |
| Key Note | Match full ABB code 2UBA002322R0018 including R0018 suffix — plates are frame-size & revision specific |
h2 Technical Principles and Innovative Values:
- Innovation Point 1 — Engineered Stray Capacitance for EMC Compliance Without Extra Filters. The 2UBA002322R0018 is not a generic piece of metal—it is dimensioned and positioned to provide a precise amount of parasitic capacitance between the drive’s internal DC bus (or phase-node point) and the protective earth (PE) plane of the heatsink/chassis. This deliberate coupling shunts high-frequency common-mode currents to ground before they can travel out on the motor or supply cables, satisfying EN 61800-3/ IEC 61000-6-4limits without adding a bulky external line filter in many applications.
- Innovation Point 2 — Gas-Tight, Low-Impedance Chassis Bonding by Design. The plate’s mounting holes, surface finish, and use of star washers / serrated flange screws (specified in ABB’s torque docs) ensure a gas-tight, low-ohm bond to the drive chassis. This is critical—any increase in ground impedance at VHF frequencies degrades EMC performance and can introduce ground-loop offset into analog measurements. The 2UBA002322R0018 is stamped and plated specifically to maintain this bond over the drive’s service life, even in mildly corrosive atmospheres.
- Innovation Point 3 — Dual Role as Laminated Busbar Collector in Larger Frames. In some ACS800 / ACS880 frame sizes the same part-number family serves as a laminated DC-collector plate distributing +DC and −DC bus potential to the IGBT modules with minimal loop inductance. The careful separation of layers and cutouts suppresses parasitic ringing—a subtle but important factor in reliable high-power switching that distinguishes ABB’s internal power architecture from generic busbar assemblies.
