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- Allen Bradley
- SK-R9-PCG2-DF67
- PowerFlex 750 DC Precharge Kit
- USA
- 120 x 30 x 100 mm
- 0.91 kg
- Xiamen, China
- New & In Stock
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Product Overview
The SK-R9-PCG2-DF67 is a DC Precharge Kit used in the Allen-Bradley PowerFlex 750-Series AC Drives, designed specifically for Frame 6 and Frame 7 systems (400/480V class).
Its primary function is to control the charging of the DC bus capacitors during startup, preventing excessive inrush current that could damage power components or cause drive faults.
This is a critical internal power protection module, not a control or communication device.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | SK-R9-PCG2-DF67 |
| Product Type | DC Precharge Kit |
| System Compatibility | PowerFlex 750-Series AC Drives |
| Frame Size | Frame 6–7 |
| Voltage Class | 400 / 480 VAC systems |
| Function | DC bus capacitor precharge control |
| Electrical Role | Limits inrush current during power-up |
| Installation Type | Internal drive assembly kit |
| Weight | 0.91 kg |
| Dimensions | 120 × 30 × 100 mm |
Function and Working Principle
The SK-R9-PCG2-DF67 manages the safe energization of the DC link circuit inside the drive.
Key Functions
- Gradually charges DC bus capacitors at startup
- Limits inrush current from the AC supply
- Protects rectifier and inverter power stages
- Ensures stable transition to full DC bus voltage
- Prevents nuisance tripping and hardware stress
Startup Sequence
- AC power is applied to the drive
- Precharge circuit routes current through limiting path
- DC bus capacitors charge slowly
- Voltage stabilizes at nominal DC level
- Bypass contactor closes
- Drive enters normal operation
Role in Industrial Control Systems
The SK-R9-PCG2-DF67 functions as:
- A startup protection module for VFD power systems
- A DC bus current limiting device
- A critical safety component for PowerFlex 750 drives
- A hardware safeguard for power electronics longevity
Without it, the drive may experience high inrush current, DC bus faults, or component failure at startup.
Industrial Applications
Used in high-power motor drive systems such as:
- Conveyor systems
- Industrial pumps
- HVAC fan systems
- Compressors
- Material handling equipment
- Process industry drive systems
It is always part of a complete PowerFlex 750 drive assembly, not a standalone field device.
Installation and System Integration
- Installed inside PowerFlex 750 Frame 6–7 drive enclosure
- Connected to DC bus precharge circuitry
- Works with rectifier and power modules
- Must match correct voltage class (400/480V systems)
- Replaced during drive maintenance or repair
- No external wiring required
⚠️ High-voltage installation—service only by qualified personnel.
Compatible System Components
- PowerFlex 750-Series AC Drives
- Frame 6 and Frame 7 power assemblies
- DC bus capacitor banks
- Rectifier input modules
- Main control boards
- Precharge resistors and contactor assemblies
Recommended Alternative Models
| Model | Product Type | Key Feature |
|---|---|---|
| SK-R9-PCG2-DF67 | DC Precharge Kit | Frame 6–7 400/480V standard |
| SK-R9-PCG2-FF67 | DC Precharge Kit | 600/690V variant |
| SK-RT-DCPC-F67 | Precharge kit | Alternative PowerFlex 750 kit |
| Complete power module kit | Drive subsystem | Full replacement assembly |
Key Advantages
- Protects drive from inrush current damage
- Extends lifespan of DC bus capacitors
- Ensures stable and safe startup sequence
- Essential for PowerFlex 750 Frame 6–7 operation
- Improves overall system reliability
Technical FAQs
Q1: What is the main function of SK-R9-PCG2-DF67?
It controls DC bus capacitor charging to limit inrush current during drive startup.
Q2: Is it a control module?
No, it is a power protection component inside the drive.
Q3: Which drives use it?
It is used in PowerFlex 750 Frame 6–7 drives (400/480V class).
Q4: What happens if it fails?
The drive may fail to start or trigger DC bus / precharge faults.
Conclusion
The Allen-Bradley SK-R9-PCG2-DF67 DC Precharge Kit is a critical internal protection component for PowerFlex 750 Frame 6–7 drives. It ensures safe startup by controlling DC bus capacitor charging and protecting the drive from damaging inrush currents, making it essential for reliable industrial motor control systems.