Siemens 7KK1200-4AD11 (C73249-A97-B79-2) – SIMOVERT Drive Control Board | Precision Motion Control Platform
Engineering Background
The Siemens 7KK1200-4AD11, carrying the internal board reference C73249-A97-B79-2, is a factory-original control board designed for the SIMOVERT MASTERDRIVES family of AC variable-speed drives. Engineered to Siemens’ stringent IEC/EN industrial standards, this board serves as the central intelligence layer for closed-loop vector control, managing real-time torque, speed, and flux regulation across demanding industrial drive applications.
Product Positioning
Sourced directly from decommissioned OEM systems and rigorously inspected, this board is positioned as a high-reliability replacement and spare for maintenance engineers and procurement teams managing SIMOVERT MASTERDRIVES installations. It eliminates the lead-time risk of new-build procurement while maintaining full functional equivalence to the original factory specification.
Complete Technical Specifications
| Manufacturer | Siemens AG |
| Part Number | 7KK1200-4AD11 |
| Board Reference | C73249-A97-B79-2 |
| Platform / Series | SIMOVERT MASTERDRIVES |
| Board Function | Drive Control Board (Main Control PCB) |
| Control Architecture | Vector Control (Closed-Loop FOC) |
| Communication Interface | PROFIBUS-DP / USS Protocol (platform-dependent) |
| Operating Voltage | 24 V DC (internal logic supply) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -25 °C to +70 °C |
| Protection Class | IP00 (board-level, chassis-mounted) |
| Compliance Standards | CE, IEC 61800-3, EN 55011 |
| Weight | 1,540 g (approx.) |
| Condition | Used / Refurbished – Functionally Tested |
| Country of Origin | Germany |
Proven Application Environments
- Heavy Industry: Steel rolling mills, paper machines, extruders, and large compressor drives requiring precise torque control
- Material Handling: Crane hoists, conveyor systems, and automated storage/retrieval systems (AS/RS)
- Process Industry: Pump and fan drives in chemical, petrochemical, and water treatment plants
- Marine & Offshore: Thruster and winch drive systems operating under variable load profiles
- Power Generation: Auxiliary drive systems in turbine and generator installations
- Machine Tools: CNC spindle and feed axis drives requiring high dynamic response
Engineering Advantages
- Drop-in Replacement: Identical form factor and connector pinout to the original OEM board — no firmware re-flashing required in most configurations
- Closed-Loop Vector Control: Supports full-flux field-oriented control (FOC) for high-precision speed and torque regulation down to zero speed
- PROFIBUS-DP Ready: Native fieldbus integration enables seamless connection to Siemens SIMATIC S7 PLC networks and distributed I/O
- Robust EMC Design: Shielded PCB layout and hardware filtering meet EN 55011 Class A/B emission limits in industrial environments
- Proven Longevity: SIMOVERT MASTERDRIVES platform has a 20+ year field track record in mission-critical installations globally
- Immediate Availability: In-stock, ready to ship — eliminates 8–16 week new-component lead times
System Architecture & Signal Flow
The 7KK1200-4AD11 control board interfaces with the drive’s power section via a dedicated gate driver interface, receiving real-time feedback from motor current sensors and encoder/resolver inputs. The onboard DSP executes the field-oriented control algorithm at a fixed PWM carrier frequency, generating IGBT switching commands with microsecond-level precision. Setpoint commands are received via PROFIBUS-DP or analog reference inputs, processed through the speed/torque controller cascade, and output as modulated gate signals to the inverter bridge. Fault detection, parameter storage, and diagnostic logging are handled onboard, with status accessible via the drive’s operator panel or fieldbus master.
Sourcing & Quality Verification
- Origin: Removed from decommissioned Siemens SIMOVERT MASTERDRIVES units in controlled industrial environments
- Inspection Protocol: Visual inspection (IPC-A-610 reference standard), power-on functional test, and key signal path verification
- Traceability: Board serial number and revision code documented at time of inspection
- Packaging: Anti-static ESD bag + foam-lined carton, compliant with JEDEC JESD625 handling requirements
- Warranty: 90-day functional warranty against defects identified under normal operating conditions
Procurement Process
- Confirm Compatibility: Verify your drive chassis model and existing board part number against 7KK1200-4AD11 / C73249-A97-B79-2 before ordering
- Request Quotation: Contact our engineering team for volume pricing, lead time confirmation, and export documentation
- Order & Payment: Secure checkout via Shopify — T/T bank transfer and major credit cards accepted
- Shipping: DHL Express / FedEx International Priority — typical transit 3–7 business days; export declaration and commercial invoice included
- Installation Support: Post-delivery technical support available via email for parameter configuration and commissioning guidance
Technical FAQ
Q: Is this board compatible with all SIMOVERT MASTERDRIVES variants?
A: The 7KK1200-4AD11 is designed for specific SIMOVERT MASTERDRIVES chassis configurations. Please confirm your drive’s full model number and existing control board part number with our team before ordering to ensure exact compatibility.
Q: Does the board require re-parameterization after installation?
A: In most cases, drive parameters are stored in the operator panel (OP1S) or a parameter module — not on the control board itself. A standard recommissioning procedure per Siemens documentation is recommended after board replacement.
Q: Can you provide a test report or inspection certificate?
A: Yes. A functional test record is available upon request. Please contact us prior to or at time of order.
Q: What is the export classification for this product?
A: This product is classified as industrial electronic spare parts. Export documentation including commercial invoice, packing list, and HS code declaration is provided with every shipment.
Q: Do you accept returns?
A: Returns are accepted within 30 days for items in original condition. Boards showing signs of installation or modification are evaluated on a case-by-case basis.
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