Custom OEM Control Panel Manufacturing: From Design to Delivery — Complete Guide

For OEM machine builders, control panels are the brain of every system they deliver. But building control cabinets in-house requires significant investment in facility, tooling, certified personnel, and component supply chain management. Outsourcing to a specialized partner like SENTRADO can reduce costs by 20–35%, accelerate delivery by 2–4 weeks, and ensure consistent quality across every unit shipped — while freeing your engineering team to focus on core machine design and innovation.

As a Siemens Authorized System Integrator with 25+ years of industrial automation experience and a 5,000 m² dedicated panel assembly facility, SENTRADO has manufactured thousands of control panels for OEM customers across packaging, food processing, material handling, environmental equipment, and industrial machinery. This guide covers the complete OEM control panel manufacturing process — from architecture design to quality assurance.

1. Why OEMs Outsource Control Panel Manufacturing

The decision to outsource control panel manufacturing is driven by five key factors:

• Cost reduction: Eliminate capital investment in panel shop equipment (CNC punching, wire processing, labeling machines). Reduce labor costs through economies of scale — a dedicated panel manufacturer spreads fixed costs across multiple customers
• Focus on core competency: Machine builders focus on mechanical design and process technology while electrical integration specialists handle panel fabrication, wiring, and testing
• Scalability: Scale production up or down without hiring/laying off skilled electricians. Handle seasonal demand spikes without capacity constraints
• Certification expertise: Access to UL, CE, CSA specialists without maintaining in-house certification engineers. Navigating the complexities of NEC/IEC compliance becomes the panel builder's responsibility
• Supply chain advantage: As a Siemens Certified System Integrator with established relationships with ABB, Schneider, Phoenix Contact, and Weidmüller, SENTRADO offers preferential pricing on components and can navigate global semiconductor shortages more effectively

2. OEM Automation Architecture: PLC + HMI + SCADA Integration

A well-designed OEM control panel integrates three core layers of automation. Understanding this architecture helps OEM machine builders specify exactly what they need from their panel manufacturer:

Layer 1: PLC Control Core

The PLC (Programmable Logic Controller) is the real-time control engine. For OEM applications, typical choices include:

• Siemens S7-1200: Ideal for compact machines with <500 I/O points. Integrated PROFINET, compact footprint, cost-effective. Perfect for packaging machines, small conveyors, and auxiliary equipment.
• Siemens S7-1500: High-performance option for complex machines with high-speed motion control, large I/O counts, or safety requirements. Supports SIL 3 safety functions for machines requiring safety-rated control.
• Siemens LOGO!: For simple automation tasks (relay replacement, basic sequencing). Cost-effective solution for small OEM applications with <24 I/O points.

Learn more about selecting the right PLC platform in our guide to choosing the right PLC control cabinet.

Layer 2: HMI (Human-Machine Interface)

The HMI provides the operator interface for machine control. SENTRADO integrates Siemens KTP700 to KTP1900 Comfort Panels based on screen size requirements. Key HMI features for OEM machines include recipe management (for machines processing multiple products), alarm logging with email/SMS notifications, user authentication with role-based access, and USB data export for production reporting.

Layer 3: SCADA / MES Integration (Optional)

For OEM machines that need to connect to a factory-wide SCADA or MES system, SENTRADO pre-configures OPC UA or MQTT communication. This enables centralized monitoring, production data collection, and integration with ERP systems (SAP, Oracle) for Industry 4.0 readiness.

3. SENTRADO's OEM Manufacturing Capabilities

4. OEM Workflow: From Design to Delivery

Step 1 — Design Review & DFM Feedback

Our engineers review your electrical schematics (EPLAN/AutoCAD), BOM, and specifications. We provide Design for Manufacturing (DFM) feedback to optimize layout, reduce wiring complexity, improve serviceability, and lower costs. Typical DFM recommendations include: consolidating redundant terminal blocks, optimizing DIN rail layouts for heat dissipation, specifying alternative components for supply chain resilience, and adding test points for faster troubleshooting.

Step 2 — Procurement & Kitting

As a Siemens Certified System Integrator (Professional Grade) with established relationships with ABB, Schneider, Phoenix Contact, and Weidmüller, we source all components at competitive pricing. Every component is incoming-inspected and kitted by panel. We maintain safety stock of commonly used components to buffer against supply chain disruptions.

Step 3 — Assembly & Wiring

Skilled technicians assemble DIN rails, mount components, label all devices (laser-engraved, fade-proof), and wire per your schematics using professional crimping tools (Phoenix Contact Crimpfox) for consistent, reliable terminations. Every wire is individually ferruled and labeled at both ends.

Step 4 — Quality Inspection & Testing

Every panel undergoes rigorous 100% testing:

• Point-to-point wire verification against schematics
• Insulation resistance testing (500V Megger)
• Functional testing: power-up, I/O check, communication test
• PLC program download and cycle test (if programming is in scope)
• Visual inspection per IPC-A-610 workmanship standards
• Thermal imaging scan for hot spots (on request)

Step 5 — Documentation & Shipping

Complete documentation packages include as-built drawings (PDF + EPLAN project files), test reports with pass/fail records, component datasheets and certificates, wiring diagrams, and warranty certificates. Panels are packed in custom plywood crates with foam padding for safe international shipping (export-grade, ISPM-15 compliant).

5. Multi-Industry OEM Applications

Packaging Machinery

Control panels for filling machines, labeling machines, cartoners, and complete packaging lines. Integration with servo drives (Siemens SINAMICS) for precision motion control. Typical I/O count: 100–300 points per machine. Includes safety relay modules for emergency stop and light curtain integration.

Material Handling & Conveyors

VFD-controlled conveyor systems with sorting, merging, and accumulation logic. PLC-controlled zone control for energy optimization. Integration with barcode scanners and warehouse management systems (WMS).

Food Processing Equipment

Stainless steel (316L) enclosures with IP65+ rating for washdown environments. Food-grade components and lubricants. Temperature control for ovens, fryers, and pasteurizers. Compliance with FDA, EHEDG, and 3-A Sanitary Standards.

Water & Wastewater Equipment

Equipment skids for dosing systems, filtration units, and pumping packages. Weather-rated (NEMA 4X) enclosures for outdoor installation. Remote monitoring via 4G/5G cellular. For more on water treatment applications, see our water treatment solutions page.

Industrial Furnaces & Ovens

Multi-zone temperature control with PID tuning. Safety burner management systems (BMS) per NFPA 86. Integration with data loggers for thermal profiling and batch records.

6. Quality Standards & Certifications

Quality is non-negotiable in OEM panel manufacturing. SENTRADO maintains:

• ISO 9001 Quality Management System: Full traceability from component procurement through final testing
• UL 508A Listed: Industrial control panel assembly per UL standards for North American exports
• CE Marking: Compliance with EU Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU)
• IEC 61439: Low-voltage switchgear and controlgear assembly standards
• 12-month warranty: On all assembled panels, with lifetime technical support

7. PLC Programming Services for OEM Machines

Beyond panel fabrication, SENTRADO provides complete PLC and HMI programming services for OEM machines. Our programming capabilities include:

• Structured programming: Using IEC 61131-3 languages (Ladder, FBD, ST) with modular, reusable code blocks that simplify future modifications
• Motion control: Servo positioning, cam profiles, electronic gearing, and registration control using Siemens Technology modules
• Safety programming: Safety PLC programs with emergency stop, light curtain, safety door monitoring, and safe torque off (STO) integration per ISO 13849
• HMI development: Intuitive operator interfaces with multi-language support (essential for OEM machines shipped internationally), recipe management, and alarm systems
• Remote access: VPN-based remote diagnostics capability, enabling your service team to troubleshoot machines anywhere in the world

For OEM machines requiring custom PLC control cabinets with integrated programming, SENTRADO provides a single point of responsibility from design through commissioning.

8. Cost Optimization Strategies for OEM Panels

SENTRADO helps OEM customers optimize panel costs through several strategies:

• Standardization: Use common enclosure sizes, terminal types, and wire colors across all machine models to reduce variety and improve assembly efficiency
• Component consolidation: Replace multiple single-function devices with multifunction units (e.g., motor starters with integrated overload + contactor)
• Modular design: Design panels in modular sections that can be mixed and matched across machine variants
• Volume commitments: Annual blanket orders with scheduled releases unlock better component pricing and priority production slots
• Value engineering: Our engineering team reviews each design for cost-saving opportunities without compromising quality or safety