Siemens 6SE7031-7HG84-1JA1 PSU1 Power Supply Module

Key Features

• Dual-Input Capability – Accepts 3-phase AC mains or direct DC bus input (510–620 V DC / 890–930 V DC) for maximum installation flexibility

• Regulated Internal Power – Provides stable low-voltage rails for control boards, firing circuits, and auxiliary logic

• Galvanic Isolation – Protects sensitive control electronics from line-side transients and common-mode noise

• Chassis Compatibility – Designed for MASTERDRIVES frames E through H

• Essential Control Power – Maintains drive processor and communication power during AC line drops or brownouts

Technical Parameters

Core Advantages

1. Multi-Source Input Flexibility

The PSU1 module features an adaptable internal transformer and rectification matrix that operates in parallel with the drive's main power cycles. It can draw power directly from the 3-phase AC mains or tap into the high-voltage DC bus (DC+ and DC- links). This dual-input capability ensures that internal control microprocessors and communication interface options remain powered up and ready to report diagnostics even during an AC line drop or primary mains brownout .

2. Galvanic Isolation and System Protection

Built specifically for the physical and electrical configurations of large MASTERDRIVES frames (Sizes E through H), this module provides galvanic isolation between the high-potential supply inputs and the low-voltage internal backplane. It protects the drive's central memory registers, processor chips, and communication modules from line-side voltage transients, tracking ripples, and common-mode electrical noise .

3. Critical for Drive Control Power

The PSU1 is the dedicated internal power supply that feeds the drive's primary control boards and firing circuits. Without stable output from this module, the drive's processing core loses power, the PMU display blanks out, and all communication channels time out, resulting in complete loss of drive control .

4. Proven MASTERDRIVES Reliability

The SIMOVERT MASTERDRIVES platform is a mature, field-proven drive system with decades of deployment in critical industrial applications. The PSU1 module is engineered to Siemens' rigorous industrial standards, ensuring reliable performance in demanding environments.

Applications

The Siemens 6SE7031-7HG84-1JA1 is deployed as an internal power supply in SIMOVERT MASTERDRIVES chassis units:

Primary Functions

• Internal Power Regulation – Converts AC or DC input to stable low-voltage DC rails

• Control Board Supply – Powers CUD1 control board, firing circuits, and communication modules

• Galvanic Isolation – Protects control electronics from power section transients

• Diagnostic Support – Maintains power for fault reporting during line disturbances

Recommended Models & Related Products

Note: The PSU1 is a specific spare part for the SIMOVERT MASTERDRIVES platform. Always verify the exact board number against your drive's spare parts documentation before ordering.

What's Included

• 1 × Siemens 6SE7031-7HG84-1JA1 PSU1 Power Supply Module

Note: Drive unit, control board, and other system components are sold separately.

Why Buy From Us?

• In Stock – Ready to ship immediately

• Fast Shipping – Expedited shipping options available

• Warranty Included – Purchase with confidence

• Technical Support – Drive compatibility assistance available

Frequently Asked Questions (FAQ)

Q1: What is the Siemens 6SE7031-7HG84-1JA1?

It is a PSU1 Power Supply Module for the SIMOVERT MASTERDRIVES platform. It is an internal power supply board that converts AC or DC input power into regulated low-voltage DC rails for the drive's control electronics, firing circuits, and communication modules .

Q2: What chassis designs is this PSU1 compatible with?

The module is designed for MASTERDRIVES chassis designs E through H .

Q3: What input voltages does this module accept?

It accepts:

• 3-Phase AC: 380–460 V AC / 660–690 V AC at 50/60 Hz

• DC: 510–620 V DC / 890–930 V DC

Q4: What happens if the PSU1 module fails completely?

A total failure of the PSU1 module cuts internal control power to the drive's processing core. The PMU display window will blank out entirely, all external fieldbus communication channels will time out, and the host PLC or automation network will log an immediate communication loss or device node failure .

Q5: Can this module be hot-swapped?

No. Unseating or installing this internal power supply card while the primary AC mains line is connected or while the VFD's high-voltage DC bus capacitors remain charged is strictly prohibited. Attempting an energized replacement risks severe inductive electrical arcing, board-level short circuits, and permanent destruction of the drive's main control interface electronics .

Q6: What is the net weight of this module?

The net weight is approximately 0.78–1.1 kg, depending on the specific revision .

Q7: What is the country of origin?

Germany (DE) .

Q8: Is this a genuine Siemens product?

Yes. This is a genuine Siemens spare part with order number 6SE7031-7HG84-1JA1.

Q9: What should I verify before ordering?

Always verify the exact board number (6SE7031-7HG84-1JA1) against your drive's spare parts documentation, confirm your drive chassis design (E through H), and check the existing board configuration before ordering.