Siemens 6SE7021-3TP50-Z AC Drive Inverter – Obsolete SIMOVERT Compact Plus Spare Part

Technical Dossier

Product Details And Specifications

Siemens 6SE7021-3TP50-Z AC Drive Inverter – Obsolete SIMOVERT Compact Plus Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Solving the Discontinued Hardware Crisis

The SIMOVERT Compact Plus series was Siemens' compact-footprint drive solution deployed extensively in the 1990s and early 2000s across automotive body shops, paper mills, chemical dosing lines, and material handling conveyors. The 6SE7021-3TP50-Z specifically occupied the 5.5 kW slot in multi-drive panel configurations — a position that is rarely a standalone unit. When this inverter fails, it typically takes down a coordinated drive group, not just a single motor.

Siemens officially discontinued the Compact Plus series and has transitioned customers toward the SINAMICS G120 and S120 platforms. The migration path is technically valid but operationally expensive: it requires new power modules, new control units, updated firmware, and in most cases, a full re-parameterization of the drive application. For a facility running 20 to 80 of these units across multiple lines, the capital expenditure is substantial — and the engineering hours are not trivial.

Condition & Reliability Assurance

Obsolete drive components sourced from the secondary market carry real risk if not properly evaluated. DriveKNMS applies a 5-step inspection protocol to every 6SE7021-3TP50-Z unit before it is offered for sale:

• Step 1 – Electrolytic Capacitor Assessment: DC bus capacitors and gate drive capacitors are tested for capacitance retention and ESR. Units with degraded capacitors are either recapped with equivalent-spec components or rejected.
• Step 2 – Firmware Version Verification: The control board firmware is read and documented. Customers are informed of the exact firmware revision to confirm compatibility with their existing drive configuration.
• Step 3 – Pin and Connector Inspection: All control terminals, power terminals, and fiber optic ports are inspected under magnification for oxidation, corrosion, and mechanical damage. Affected contacts are cleaned or the unit is rejected.
• Step 4 – Power-On Functional Test: Where test equipment permits, units are energized at reduced voltage and monitored for fault codes, gate signal integrity, and thermal behavior.
• Step 5 – Packaging and ESD Protection: Units are packed in anti-static bags with foam cushioning and labeled with inspection date and condition grade prior to shipment.

Key Features for System Maintenance

• Drop-in replacement: The 6SE7021-3TP50-Z installs directly into the existing Compact Plus cabinet slot. No mechanical modification is required.
• No reprogramming required: Drive parameters are stored on the PMU operator panel or external parameter module. Swapping the power unit does not erase application parameters in standard configurations.
• Avoids engineering reconstruction costs: Replacing this unit preserves the existing motor cable sizing, braking resistor configuration, and PLC I/O mapping — none of which need to be revisited.
• Maintains production continuity: A verified spare on the shelf converts a potential multi-week production stoppage into a same-shift repair.

Q: Can you source other variants in the 6SE70 series?
A: Yes. DriveKNMS specializes in the full SIMOVERT MasterDrives Compact Plus and Vector Control ranges. Contact us with your specific part number for availability.