Engineering & quality
Scope defined.
Evidence released before production.
Honghao connects application inputs to an approved BOM, electrical drawings, controlled assembly, FAT evidence and an as-built handover package—so overseas buyers can review what will be built before it ships.
Assumptions recorded Drawings released FAT boundary defined
Common engineering searches
Answers buyers need before panel release.
These questions affect design responsibility, quotation completeness and the evidence available at FAT. Each answer links to a dedicated technical page.
01What information is needed to design a control panel?
Start with load and I/O schedules, supply and fault data, operating modes, interfaces, environment, destination requirements and acceptance scope.
Read the engineering answer02Which electrical drawings should be approved before assembly?
The released BOM, panel layout, single line, power and control schematics, interfaces and terminal information needed for production should carry a clear approval status.
Read the engineering answer03What should a control-panel FAT include?
Agree document, material, workmanship, electrical and functional checks before testing, then record deviations, corrective actions and retest evidence.
Read the engineering answer04Who owns the PLC and HMI source code?
Ownership, editable format, passwords, libraries, backups and handover responsibilities must be written into the commercial and technical scope.
Read the engineering answer05Does an IEC reference mean the panel is certified?
No. A standard reference states a technical basis; certification and project compliance require a defined scope, verification plan and supporting evidence.
Read the engineering answer06How are engineering changes controlled after approval?
Record the reason, affected BOM and drawings, technical and delivery impact, approval status and the final as-built revision before release.
Read the engineering answerEngineering knowledge
Five controlled workstreams
Choose the workstream that matches the document, design decision or acceptance evidence you need to review.
Control Panel Engineering
A design-basis workflow for load, protection, thermal, EMC, control power, enclosure and environmental decisions.
- Load and supply
- Protection basis
- Thermal balance
Electrical Documentation for Control Panels
Approved and as-built technical records connecting the component list, wiring, interfaces, settings and acceptance scope.
- Bill of materials
- General arrangement
- Electrical schematics
PLC, HMI and Drive Integration
Version-controlled PLC, HMI, drive and network engineering connected to the functional specification and acceptance plan.
- Architecture baseline
- Functional specification
- HMI engineering
FAT and Quality Control
Pre-agreed material, workmanship, electrical and functional checks linked to the released design and recorded deviations.
- Document baseline
- Material identity
- Workmanship
Standards, Verification and Scope Boundaries
A transparent map of applicable requirements, evidence, customer responsibilities and limits of workshop verification.
- Applicable requirements
- IEC 60204-1
- IEC 61439
Project workflow
Six controlled stages
Each stage produces a decision or document. Assembly should not start from an incomplete product list or an unapproved sketch.
Requirement capture
Application, loads, supply, environment, destination, standards, interfaces and commercial boundary are recorded in a design-basis checklist.
Selection & quotation
Major components, options, exclusions, lead-time basis and technical assumptions are identified before commercial confirmation.
Design approval
BOM, single line, schematics, panel layout and interface documents are issued for approval before assembly.
Assembly & internal QC
Material identification, mounting, wiring, torque, labels and workmanship are checked against the released drawings.
FAT & punch list
The agreed inspection and functional test plan is completed; deviations are recorded and closed before packing.
As-built & export
Final drawings, settings, reports and packing documents are compiled and the cabinet is prepared for the agreed shipping method.
Design review
What engineers check
The depth of calculation and verification is agreed per project. Missing source data is recorded as an assumption, not hidden inside the quotation.
Load and supply
Rated voltage, frequency, phases, earthing system, full-load current, diversity, inrush and future spare capacity.
Protection
Incoming and branch protection, motor protection, selectivity/coordination target and available short-circuit information.
Thermal
Device losses, ambient temperature, altitude, enclosure size, ventilation, filters, cooling and internal temperature limits.
EMC and wiring
Cable segregation, shield termination, protective bonding, drive cable length, reactor/filter needs and sensitive signal routing.
Control power
24 V load schedule, inrush, branch selectivity, redundancy, UPS bridge time and diagnostic integration.
Human interface
Door devices, HMI height, labels, language, alarm strategy, maintainability and safe access.
Network
PROFINET topology, managed switches, addressing, fiber/copper media, remote access and configuration ownership.
Environment
Indoor/outdoor location, IP rating, dust, humidity, corrosion, vibration, washdown, cable entry and transport restraints.
Documentation
A panel should arrive with its technical memory.
Deliverables are listed in the quotation so the customer knows which files will be available for approval, FAT, installation and future maintenance.
- Approved bill of materials
- General arrangement and panel layout
- Single-line and power schematic
- Control schematic and I/O interfaces
- Terminal plan and cable schedule when agreed
- Device setting and parameter schedule
- FAT protocol and punch-list closure
- As-built drawing package
- Packing list and agreed export documents
- Software or backup package when included in scope
Standards basis
Project-specific, not implied.
Destination rules, machine category and customer specifications decide the final standard set. Referencing a standard does not itself constitute certification.
Electrical equipment of machines
Relevant for machine electrical systems from the supply connection point; project applicability must be confirmed.
Low-voltage switchgear and controlgear assemblies
Used as a design and verification basis when the assembly scope and destination require it.
Adjustable-speed power drive systems
Relevant to electrical, thermal and energy safety of drive systems and their integration.
Enclosure IP code
Used to define protection against access, solid objects and water; the installed assembly determines final performance.
Typical FAT
What can be witnessed
- Drawing, BOM and nameplate review
- Visual workmanship and labeling
- Protective-conductor continuity
- Control-voltage and I/O simulation
- PLC/HMI sequence tests within agreed scope
- Drive/starter parameter and alarm checks
- Document and backup-package review
Site boundary
What FAT cannot prove
- Actual motor and mechanical load performance
- Site cable installation and earthing
- Process capacity or product quality
- Plant network and third-party system behavior
- Final machine safety validation
- Local authority acceptance unless separately contracted
Important
Honghao will not describe a panel as IEC-, UL- or other-standard compliant unless the agreed design, verification, manufacturing and documentation scope supports that claim. Certification by a notified or listed body is separate where required.
Better inputs, better project