Allen-Bradley SK-G9-PWRS1-D0 PowerFlex 700 Power Supply Board Kit

The Allen-Bradley SK-G9-PWRS1-D0 is an internal, switch-mode switchboard power supply (SMPS) field replacement kit engineered specifically for Rockwell Automation PowerFlex® 700 AC drives in Frames 5 and 6 operating on 400V AC to 480V AC networks.

From a marine and heavy industrial electrical engineering standpoint, internal drive switch-mode supplies serve as the heartbeat of variable frequency drive (VFD) architectures. The SK-G9-PWRS1-D0 taps the incoming DC bus / high-voltage intermediate circuit (or internal AC auxiliary feeder) to generate isolated, precision-regulated secondary DC voltages—predominantly a stabilized nominal 24 VDC bus (up to 3.0 A continuous output). This rail energizes critical lower-level sub-assemblies:

When a power supply board degrades due to electrolytic dry-out, sustained thermal cycles, or high-voltage transients common on isolated marine switchboards (IT networks), the drive experiences uncommanded dropouts, auxiliary power faults (e.g., F100 series micro-resets), or complete refusal to power the HIM (Human Interface Module). The SK-G9-PWRS1-D0 kit restores the drive’s control subsystem to factory electrical tolerances.

Model Details

• Brand: Allen-Bradley / Rockwell Automation
• Catalog Number / MPN: SK-G9-PWRS1-D0
• Alternative Part Numbers / Text Variants:
  • SKG9PWRS1D0
  • SK-G9-PWRS1-DO
  • SK-G9-PWRSI-D0
  • SKG9PWRSIDO
  • A-BSKG9PWRS1D0
• Target Drive Family: PowerFlex® 700 (Vector Control and Standard Control)
• Hardware Frame Allocation: Frame 5 and Frame 6
• Drive Line Class: 400 VAC / 480 VAC (D-Voltage Class)

Key Features

1. High-Efficiency Regulated DC Output: Converts fluctuating line/bus inputs into a regulated 24 VDC nominal bus at up to 3.0 A (≤ 75 W total consumption) with ≥ 85% operating efficiency to minimize thermal dissipation within enclosed VFD cassettes.
2. Marine-Grade Vibration & Shock Tolerant: Rated for structural resilience under high continuous vibration (1.0 g, 10 to 500 Hz) and severe mechanical shock (15 g, 11 ms half-sine pulse), making it resilient for maritime propulsion, ballast pumping, and offshore drilling platforms.
3. Integrated High-Voltage Transient Immunity: Built with heavy-duty filter stages and suppression diodes designed to withstand the severe commutating line spikes typically present in industrial grids and generator-fed marine distribution switchboards.
4. Factory-Matched Form Factor: Direct-fit modular replacement hardware designed to mate directly with the PowerFlex 700 chassis mounting studs, internal ribbon harness connectors, and power interface busbars without mechanical alteration.
5. Sub-Assembly Isolation & Safety Guarding: Provides high-potential (Hi-Pot) galvanic isolation between high-voltage DC links and low-voltage digital I/O/encoder circuitry, preserving logic integrity under inverter fault events.

Applications

• Marine Engineering & Offshore Propulsion: Bow thrusters, variable-speed seawater cooling circulating pumps, ballast water management systems, anchor windlass drives, and deck cranes on vessels and oil platforms.
• Wastewater & Municipal Fluid Systems: High-volume aeration blowers, progressive cavity sludge pumps, raw water intake pumps, and effluent booster stations.
• Heavy Material Handling: Overhead harbor cranes, mine shaft hoists, reclaimers, long run overland conveyor systems, and bulk cargo ship loaders.
• Metals, Mining, & Minerals Processing: Slurry pumps, ball mills, feed rollers, drawbenches, and slag agitators operating under punishing mechanical shocks.
• Pulp, Paper, & Forest Automation: Calender roll drives, wet-end section pumps, log debarker infeed stations, and industrial chipping lines.

Frequently Asked Questions

What are the symptoms of a failing SK-G9-PWRS1-D0 power supply board in a PowerFlex 700?

Common indicators include complete lack of illumination on the HIM (Human Interface Module), flashing red or dark status LEDs on the main vector control board, recurring non-clearing micro-processor communication faults, or an auxiliary under-voltage fault despite proper main line voltage.

Can the SK-G9-PWRS1-D0 be installed on Frame 4 or smaller PowerFlex 700 drives?

No. The SK-G9-PWRS1-D0 is physically and electrically rated strictly for Frame 5 and Frame 6 PowerFlex 700 drives (400V and 480V classes). Frames 0 through 4 utilize distinct, lower-amperage integrated power and gate drive assemblies.

Does this power supply board require software firmware flashing upon installation?

No. The SK-G9-PWRS1-D0 is an analog/switch-mode hardware supply and signal distribution component. It holds no firmware memory registers. Once correctly mounted and connected to the internal chassis wiring harness, it supplies immediate DC power without software parameter configuration.

How do I distinguish between an internal SMPS failure and a short-circuit on the external 24V I/O loop?

Disconnect all external 24V field wiring connected to the main control terminal blocks (TB1). If the drive still fails to boot and internal rails do not stabilize at nominal 24VDC, the failure is localized to the internal switch-mode power board (SK-G9-PWRS1-D0) or internal bus harness, rather than a field cabling short.

Is the SK-G9-PWRS1-D0 suitable for 600V or 690V PowerFlex 700 drives?

No. 600V/690V systems (E and F voltage classes) utilize distinct high-voltage SMPS assemblies rated for higher input direct voltages. The SK-G9-PWRS1-D0 is strictly configured for 400V/480V AC input systems (operating within 340 to 528 VAC).