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- Allen Bradley
- 1336-CAP-SP15A
- Bus Capacitor
- USA
- 140 × 50 × 76 mm
- 0.91 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Allen Bradley 1336-CAP-SP15A Bus Capacitor is a DC bus capacitor associated with the Allen Bradley 1336 series of industrial motor drives. It is used in the drive’s DC link section to store electrical energy and help stabilize the rectified DC voltage supplied to the inverter power stage.
In a variable frequency drive, incoming AC power is first converted into DC through the rectifier section. The resulting DC voltage is not perfectly smooth, so capacitors are used to reduce voltage fluctuations and provide a more stable DC bus for the downstream switching circuit.
The bus capacitor also serves as a short-term energy storage element. During normal drive operation, it works together with the rectifier, switching devices, and other DC-link components to maintain suitable electrical conditions for the inverter section.
The 1336-CAP-SP15A is therefore an internal power-electronics component rather than a general-purpose capacitor intended for arbitrary applications. Its electrical characteristics, mounting arrangement, and compatibility need to match the associated drive hardware.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen Bradley |
| Model | 1336-CAP-SP15A |
| Product Type | Bus Capacitor |
| Series | 1336 Series |
| Main Function | DC Bus Energy Storage and Filtering |
| System Role | DC Link Component |
| Application | Industrial Motor Drives |
| Typical Use | Variable Frequency Drive DC Bus |
| Dimensions | 140 × 50 × 76 mm |
| Weight | 0.91 kg |
| Application Area | Industrial Motor Control |
Product Features
The 1336-CAP-SP15A is designed for use in the DC bus section of compatible 1336 series drive hardware.
Key characteristics include:
- DC bus capacitor design
- Associated with Allen Bradley 1336 series drives
- Provides DC-link energy storage
- Helps reduce DC bus voltage ripple
- Supports stable inverter operation
- Works with the drive rectifier and inverter sections
- Designed for industrial motor drive applications
- Dimensions of 140 × 50 × 76 mm
- Stated weight of 0.91 kg
- Intended for integration into drive power electronics
The capacitor is part of a larger DC-link circuit. Its condition can directly affect the electrical stability of the drive’s power section.
Working Principle
The bus capacitor operates on the DC side of the drive’s rectifier.
A simplified power conversion path is:
AC Input → Rectifier → DC Bus Capacitor → Inverter → Motor
After AC input power is rectified, the capacitor stores electrical energy and helps smooth fluctuations in the DC bus voltage. The inverter then uses this relatively stable DC supply to generate the controlled electrical output required by the motor.
The capacitor also helps supply short-duration current demands from the inverter. This reduces the amount of rapid voltage variation that would otherwise appear directly on the DC bus.
As a result, the capacitor contributes to stable operation of the drive’s switching stage, although it does not perform the motor control function itself.
Role in Allen Bradley 1336 Drives
The 1336-CAP-SP15A occupies the DC-link portion of the drive power architecture.
| Function | Description |
| Energy Storage | Stores electrical energy on the DC bus |
| Voltage Smoothing | Helps reduce DC bus voltage fluctuations |
| DC Link Support | Maintains a more stable supply for the inverter |
| Transient Support | Helps accommodate short-duration changes in power demand |
| Power Stage Integration | Works with rectifier and inverter components |
| Drive Reliability | Proper capacitor condition contributes to stable drive operation |
The condition of the DC bus capacitor is therefore important when diagnosing drive faults, especially when symptoms involve excessive ripple, DC bus instability, or power-stage abnormalities.
Industrial Applications
The 1336-CAP-SP15A is intended for industrial motor drive applications where a stable DC link is required.
| Application | Typical Use |
| Industrial Motors | Variable-speed motor control |
| Conveyors | Controlled acceleration and motor operation |
| Pumps | Variable-speed pump control |
| Fans | Motor speed regulation |
| Material Handling | Drive-based motor control |
| Production Machinery | Controlled motor operation |
| Process Equipment | Variable-speed operation |
| Industrial Automation | Motor drive integration |
The exact application depends on the Allen Bradley 1336 drive configuration in which the capacitor is installed.
Installation and Maintenance
The bus capacitor is connected directly to the drive’s power electronics and may retain dangerous electrical energy after the drive has been disconnected from the incoming supply.
Before maintenance, the drive must be isolated from all applicable power sources and the DC bus voltage must be verified to have fallen to a safe level according to the appropriate maintenance procedure.
Recommended checks include:
- Confirm the complete 1336-CAP-SP15A part number.
- Verify compatibility with the associated 1336 drive.
- Check the drive model and hardware configuration.
- Inspect the capacitor for physical deformation or leakage.
- Look for signs of overheating or discoloration.
- Inspect electrical connections and terminals.
- Check surrounding DC bus components.
- Verify the capacitor is installed with the correct electrical orientation and connections.
- Perform appropriate DC bus and drive testing after replacement.
A capacitor that has failed may be a symptom of another power-stage problem. Rectifier faults, excessive ripple current, high operating temperature, switching problems, or abnormal DC bus conditions should therefore also be considered during troubleshooting.
Related Drive Components
The bus capacitor works together with several other components in the drive’s power conversion section.
| Component | Function |
| Bridge Rectifier | Converts AC input into rectified DC |
| Bus Capacitor | Stores and filters DC bus energy |
| DC Bus Circuit | Distributes the intermediate DC supply |
| Gate Driver | Controls power switching devices |
| Power Switching Devices | Convert DC bus power into controlled motor output |
| Control Board | Manages drive operation |
| Current Sensors | Provide electrical feedback |
| Cooling System | Removes heat from power electronics |
A DC bus problem should therefore be investigated as part of the complete power conversion system rather than by examining the capacitor alone.
Recommended Related Models
| Model / Component | Type | Primary Function | Application |
| Allen Bradley 1336-CAP-SP15A | Bus Capacitor | DC bus energy storage and filtering | 1336 series drives |
| Allen Bradley 1336-BR-SP5A | Bridge Rectifier | AC-to-DC rectification | 1336 series drives |
| Allen Bradley 1336-BDB-SP31C | Gate Driver | Power switching control | 1336 series drives |
| Allen Bradley 1336 Series Power Components | Power Electronics | Drive power conversion | Industrial motor control |
| Allen Bradley DC Bus Components | Power Components | DC link energy management | Variable frequency drives |
When selecting a replacement capacitor, the capacitance, voltage rating, ripple-current capability, physical mounting, terminal arrangement, temperature rating, and compatibility with the specific drive should be verified. Similar dimensions alone are not enough to establish suitability.
Key Advantages
- Provides DC bus energy storage
- Helps smooth DC-link voltage
- Supports stable inverter operation
- Associated with Allen Bradley 1336 series drives
- Works with rectifier and inverter power stages
- Suitable for industrial motor drive applications
- Dimensions of 140 × 50 × 76 mm
- Stated weight of 0.91 kg
- Suitable for drive maintenance and replacement applications
Technical FAQs
What happens to drive operation when the DC bus capacitor deteriorates?
A deteriorated capacitor can increase DC bus voltage ripple and reduce the stability of the intermediate DC supply. Depending on the severity of the degradation, the drive may develop input, DC bus, or inverter-related faults and may operate less reliably under load.
Why does the capacitor experience electrical stress during normal drive operation?
The DC bus capacitor is continuously exposed to DC voltage as well as ripple current generated by the drive’s switching operation. Temperature, ripple current, operating voltage, and service conditions all influence capacitor stress and long-term service life.
What measurements can help evaluate a suspected bus capacitor problem?
Depending on the maintenance procedure and available equipment, technicians may inspect DC bus voltage behavior, voltage ripple, capacitor physical condition, terminal connections, and other power-stage characteristics. Measurements should only be performed using procedures and equipment appropriate for energized or discharged drive circuits.
Can a capacitor with the same physical dimensions replace the 1336-CAP-SP15A?
No. Physical dimensions are only one part of the selection process. The replacement must also meet the required electrical rating, capacitance, ripple-current capability, temperature characteristics, terminal arrangement, and compatibility requirements of the associated 1336 drive.