Description
The ABB 3HAC14551-2, designated as the C3 Capacitor Unit, is a critical DC bus energy storage module engineered for ABB industrial robotics and servo drive systems . This module serves as the “energy reservoir” for the drive system, smoothing DC link voltage, absorbing regenerative braking energy from servo motors, and suppressing harmful voltage spikes that could damage sensitive IGBT power modules . Designed for use in IRC5 robot controllers and compatible ACS800/ACS880 drive platforms, the 3HAC14551-2 is a bolt-mounted component with quick-connect terminals, enabling rapid field replacement by maintenance technicians .
Application Scenarios
In a busy automotive welding line, an ABB IRB 6600 robot performs high-speed spot welding operations, with its arm accelerating and decelerating hundreds of times per shift. Each deceleration sends a surge of regenerative energy back into the DC bus—without adequate buffering, this energy would cause voltage spikes, triggering overvoltage faults and potentially damaging the drive’s IGBT modules. The ABB 3HAC14551-2 eliminates this risk entirely. Its 14,100 µF capacitor array absorbs these instantaneous power surges, maintaining stable DC bus voltage and ensuring the robot can maintain its demanding cycle rates without interruption. In a documented deployment, a heavy-load palletizing robot experienced nuisance overvoltage trips during sudden stops; after replacing the aging capacitor unit with a verified 3HAC14551-2, the trips were eliminated and the robot returned to full productivity, directly addressing the plant’s pain point of unpredictable downtime costing thousands per hour.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3HAC14551-2 (C3 Capacitor Unit) |
| Manufacturer | ABB (Sweden) |
| Product Category | DC Bus Capacitor Unit / Energy Storage Module |
| Nominal Voltage | 450 VDC |
| Total Capacitance | 14,100 µF (3 × 4,700 µF parallel array) |
| Equivalent Series Resistance (ESR) | < 15 mΩ per capacitor |
| Max Ripple Current | 30 A RMS (@120 Hz, 85°C) |
| Operating Temperature | -25°C to +85°C |
| Storage Temperature | -40°C to +105°C |
| Dimensions (L × H × W) | 355 mm × 93 mm × 75 mm |
| Weight | 2.48 kg |
| Mounting Type | Bolt-mounted with quick-connect terminals |
| Protection Rating | IP00 (for installation in closed control cabinets) |
| Applicable Systems | ABB IRC5 robot controllers, ACS800-M0x, ACS880-M0x drives |
Technical Principles and Innovative Values
- Innovation Point 1: High-Energy Absorption with Ultra-Low ESR
The ABB 3HAC14551-2 uses a parallel array of three high-ripple-current electrolytic capacitors to achieve a total capacitance of 14,100 µF at 450 VDC . This design provides an exceptionally low-impedance path (ESR < 15 mΩ per capacitor) for regenerative energy, allowing the 3HAC14551-2 to absorb kilowatts of instantaneous braking power without significant voltage rise. The minimal internal heating from this low ESR design is a key differentiator from standard capacitors, preventing thermal runaway and extending operational life in demanding robotic applications . - Innovation Point 2: Industrial-Grade Thermal Durability
Unlike commercial-grade capacitors, the ABB 3HAC14551-2 is specified for a full -25°C to +85°C operating range, with storage capability up to +105°C . This ensures reliable performance within the heat-dense confines of an un-air-conditioned robot controller cabinet. Its construction uses high-temperature electrolyte and a thick aluminum case, allowing the 3HAC14551-2 to maintain a service life exceeding 8,000 hours at maximum rated temperature—a critical factor for minimizing lifecycle costs in 24/7 production environments . - Innovation Point 3: Modular, Serviceable Design
The bolt-mounted design with quick-connect terminals on the 3HAC14551-2 enables rapid field replacement by maintenance technicians without complex soldering or re-wiring . This modularity significantly reduces Mean Time To Repair (MTTR), allowing a robot to be restored to full operation in minutes. When a drive system begins showing symptoms of capacitor aging—such as more frequent overvoltage faults—the ABB 3HAC14551-2 can be swapped out during a brief production pause, maximizing equipment availability.