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- 3HAC4816-2
- Resistor Unit
- Sweden (SE)
- 500 × 45 × 360 mm
- 2.27 kg
- Xiamen, China
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Product Overview
The ABB 3HAC4816-2 S4C+ Resistor Unit is a resistive electrical component used within ABB S4C+ robot controller and drive systems. It forms part of the power and braking circuit associated with the robot system, where electrical energy may need to be dissipated during controlled deceleration or other operating conditions.
In robotic motion systems, the motors can return electrical energy toward the drive when the robot axes decelerate. A resistor unit provides a controlled path for dissipating this energy as heat, helping the associated drive system manage the DC-bus energy generated during braking.
The 6×77 Ohm configuration identifies the resistor arrangement supplied by this unit. It can be used in S4C+ installations where the robot drive architecture requires an external resistive load for energy dissipation.
For maintenance and replacement, the resistor configuration should be matched to the existing S4C+ drive and braking arrangement. Wiring, resistor connections, mounting condition, thermal environment, and the associated drive configuration should all be checked before returning the robot to service.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | 3HAC4816-2 |
| Product Family | S4C+ |
| Product Type | Resistor Unit |
| Resistor Rating | 6×77 Ohm |
| Primary Function | Electrical energy dissipation |
| System Role | Robot drive braking / energy dissipation |
| Application | ABB S4C+ industrial robot control systems |
| Dimensions | 500 × 45 × 360 mm |
| Weight | 2.27 kg |
Product Features
- S4C+ resistor unit for ABB robotic control systems
- 6×77 Ohm resistor configuration
- Used for electrical energy dissipation within the robot drive system
- Suitable for braking and deceleration-related energy management
- Works with the associated robot drive and controller architecture
- Requires appropriate thermal installation conditions
- Suitable for industrial robot control cabinets
- Applicable to maintenance and replacement of compatible S4C+ installations
Working Principle
During robot-axis deceleration, the motor can operate as a generator and return electrical energy to the drive’s DC bus. If this energy causes the DC-bus voltage to rise beyond the desired operating range, the drive can direct the excess energy toward the resistor circuit.
The resistor unit converts the electrical energy into heat according to the electrical resistance of the connected circuit. This allows the drive system to control regenerated energy during braking without allowing the DC bus to rise indefinitely.
Robot Motor → Drive System → DC Bus → Braking Circuit → 3HAC4816-2 Resistor Unit → Heat Dissipation
The resistor unit does not calculate robot motion or execute the robot application program. Its function is associated with the electrical energy generated during motor deceleration and the corresponding braking management performed by the drive system.
Role in an ABB S4C+ Robot Motion Control Architecture
The 3HAC4816-2 occupies the braking-energy dissipation stage of the S4C+ drive architecture. It works with the robot controller and drive system during deceleration and braking events.
S4C+ Controller → Drive System → Robot Motor → Regenerated Energy → Braking Circuit → Resistor Unit
| System Element | Function |
|---|---|
| S4C+ Controller | Executes robot programs and motion commands |
| Drive System | Controls motor operation and manages electrical energy |
| Robot Motor | Produces axis movement and can regenerate energy |
| DC Bus | Transfers electrical energy within the drive system |
| Braking Circuit | Directs regenerative energy toward the resistor when required |
| 3HAC4816-2 | Dissipates electrical energy as heat |
| Robot Mechanism | Converts motor output into programmed mechanical motion |
The resistor is therefore a supporting power component within the motion system rather than a controller or motion-processing device.
Industrial Applications
| Application | Typical Use |
|---|---|
| Industrial Robot Cells | Braking-energy dissipation in S4C+ robot controllers |
| Material Handling | Managing regenerative energy during rapid axis stopping |
| Machine Tending | Supporting controlled deceleration of robot axes |
| Welding Robots | Energy dissipation during repeated robot-axis movement |
| Assembly Automation | Braking support for frequent acceleration and deceleration |
| Packaging Robots | Managing regenerated energy during repetitive motion |
| High-Speed Robot Axes | Supporting drive braking during rapid movement changes |
| Robot Retrofit Projects | Replacement of existing S4C+ resistor units |
Installation and Maintenance
- Verify the complete 3HAC4816-2 part number before installation.
- Confirm that the resistor configuration matches the existing S4C+ drive and braking arrangement.
- Isolate the robot controller and drive system from the electrical supply before servicing the resistor unit.
- Allow the DC-bus and associated power circuits to reach a safe de-energized condition before handling the unit.
- Record the original resistor connections before disconnecting the existing component.
- Inspect the resistor body, terminals, wiring, and mounting hardware for signs of overheating or physical damage.
- Verify that the resistor is installed with appropriate ventilation and thermal clearance.
- Check the electrical connections against the approved S4C+ wiring documentation.
- Inspect nearby components for heat-related discoloration or damage before energizing the replacement.
- Verify that the associated drive and braking configuration corresponds to the installed resistor arrangement.
- Monitor drive status and braking behavior during a controlled commissioning test.
- Perform a complete robot movement and deceleration test after replacement to confirm that the drive and braking system operate correctly.
Compatible System Components
| Component | Function |
|---|---|
| ABB S4C+ Controller | Executes robot programs and motion-control commands |
| Robot Drive System | Controls motor operation and regenerative energy |
| Robot Servo Motor | Drives the robot axis and generates regenerative energy |
| DC-Bus Circuit | Transfers electrical energy within the drive system |
| Braking Circuit | Controls the path of regenerative electrical energy |
| S4C+ Power Supply | Provides electrical power to controller equipment |
| Robot Manipulator | Performs programmed mechanical movements |
| Robot Control Cabinet | Houses controller, drive, and power components |
| Thermal Ventilation System | Removes heat generated by power components |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| ABB 3HAC4816-2 | S4C+ Resistor Unit | Drive braking-energy dissipation |
| ABB S4C+ | Robot Controller | Industrial robot control |
| ABB S4C+ Drive Components | Drive System Components | Robot-axis electrical control |
| ABB S4C+ Power Components | Power Components | Robot controller power infrastructure |
| ABB S4C+ Computer Units | Computer Unit | Controller processing |
| ABB Robot Drive Units | Drive System | Robot-axis control |
| ABB Robot Servo Motors | Servo Motor | Robot-axis movement |
Key Advantages
- Provides a dedicated resistive load for braking-energy dissipation.
- Supports regenerative-energy management during robot-axis deceleration.
- Integrates with the electrical braking architecture of compatible S4C+ systems.
- Suitable for robot applications involving frequent acceleration and deceleration.
- Supports controlled handling of excess DC-bus energy.
- Useful for maintenance and replacement of compatible S4C+ braking components.
Technical FAQs
Why is a resistor unit needed in a robot drive system?
During deceleration, a servo motor can return electrical energy to the drive. A braking resistor provides a controlled path for dissipating this excess energy as heat when the drive’s braking circuit activates.
What can happen if the resistor unit is incorrectly matched to the drive system?
An unsuitable resistor configuration can affect the drive’s ability to manage regenerative energy and may result in abnormal braking behavior or drive protection events. The resistor arrangement should therefore be checked against the applicable S4C+ drive configuration.
Why does the resistor require adequate ventilation?
The resistor converts electrical energy into heat during braking. Repeated or high-energy braking events can produce significant thermal loading, so adequate clearance and heat dissipation are necessary for the installation.
What should be checked if a robot develops a braking-related fault after resistor replacement?
Check the resistor connections, mounting condition, associated braking circuit, drive configuration, and DC-bus behavior. The motor and drive should also be inspected to determine whether the fault originates from regeneration, braking control, or another part of the motion system.