Electrical/Control System: Electronic Control Cost Reduction (Compliant + Gray Optimization)——Risk control for non-standard equipment

In non-standard automation equipment, the electronic control system serves as the core unit for equipment operation, logic management, and safety protection. It also accounts for the largest proportion of the overall machine cost with significant optimization potential. Currently, industry cost reduction strategies for electronic control systems fall into two categories: compliant optimization and gray optimization. Compliant cost reduction follows official industry standards without compromising equipment performance or safety margins. In contrast, gray optimization is widely adopted by small and medium-sized equipment manufacturers. While not violating critical high-voltage safety regulations, it reduces overall equipment costs by cutting hardware parameters, simplifying construction processes, and removing program protection functions.

Such gray optimization methods do not cause startup failures or basic operation errors, enabling equipment to meet coarse production requirements. They are commonly applied to low-end non-standard equipment, short-term assembly line projects, and low-load working condition devices. However, these practices significantly reduce equipment operational redundancy and protection performance, shortening service life and increasing long-term failure rates. The mainstream industrial implementation includes three approaches: electrical component downgrade substitution, non-standard wiring and auxiliary material simplification, and control logic trimming and simplification.

1. Electrical Component Downgrade (Mainstream Gray Cost Reduction Method)

Industrial control components directly determine the accuracy, stability, and service life of electronic control systems. Component parameter downgrade is the most common gray cost reduction method in the non-standard equipment industry. The core principle is to maintain only basic production functions while cutting redundant hardware parameters, high-end features, and brand performance margins. Although no explicit compliance violations occur, the long-term operational reliability and working condition adaptability of the equipment are greatly reduced.

In terms of core industrial control hardware, high-end imported PLC and HMI touch screens are commonly replaced with entry-level low-end models. Manufacturers simplify extended interfaces by removing high-end functions such as Ethernet communication, high-speed pulse output, and high-precision analog acquisition. The overall I/O points are compressed to retain only essential input and output points required for production, eliminating hardware redundancy for later equipment expansion and modification.

Field sensing components are uniformly downgraded. High-precision original proximity switches, photoelectric sensors, displacement sensors, and temperature and pressure transmitters are replaced with generic domestic imitation models. Manufacturers reduce detection accuracy, response speed, signal stability, and overall IP protection rating to cut procurement costs, limiting equipment applicability only to stable and standard working conditions.

Low-voltage electrical components are fully downgraded. First-brand AC contactors, intermediate relays, air switches, and thermal overload protectors from Siemens and Schneider are replaced with unknown low-end brands. Component rated current and withstand voltage level are downgraded to match steady-state operating conditions, removing redundant protection parameters for overload, under-voltage, voltage fluctuation, and phase loss. The equipment can only operate stably under standard conditions and is prone to tripping, component burnout, and shutdowns under unstable voltage or fluctuating loads.

2. Wiring & Auxiliary Material Simplification (On-site Non-standard Optimization)

Electrical wiring and auxiliary materials are majorhidden costs and key targets for gray optimization in the industry. This method weakens national standard construction specifications and removes protective auxiliary materials without affecting basic power-on operation. Nevertheless, it severely impairs equipment electrical safety and electromagnetic anti-interference capability, reducing adaptability to complex industrial environments.

In cable construction, national standard wire gauges for power and signal cables are reduced, and non-standard thin-gauge cables are used instead of standard copper cables. High-frequency signal cables for servo and sensing systems remove shielding layers and cancel differential signal anti-interference wiring processes, easily causing signal drift, data fluctuation, and positioning deviation. Cables are cut to exact lengths with zero redundancy to save material costs, bringing great inconvenience for later debugging, maintenance, and equipment upgrading.

All standard auxiliary accessories are simplified. National standard thickened wire ducts, high-quality terminal blocks, fuses, and terminal lugs are replaced with thin non-standard ducts and simple plug-in terminals. Standard configurations such as wire number tubes, circuit numbers, and terminal markings are omitted, resulting in irregular cabinet wiring, extremely low troubleshooting efficiency, and increased maintenance difficulty.

Most electrical protection configurations are eliminated. Cabinet cooling fans, heat dissipation shutters, and temperature and humidity control modules are removed, leading to excessive internal temperature, moisture accumulation, and accelerated component aging. Meanwhile, power filter modules, electromagnetic anti-interference devices, and lightning surge protection units are cancelled. The equipment grounding process is excessively simplified, commonly featuring single-point grounding, excessive grounding resistance, and missing repeated grounding, which greatly increases failure risks in humid and electromagnetically interfered industrial sites.

3. Control Logic Simplification (Zero-cost Program Cost Reduction)

Control logic optimization is a zero-cost gray reduction method favored by most manufacturers. It cuts redundant PLC programs and intelligent safety functions to reduce programming man-hours, on-site debugging workload, and labor costs while simplifying the overall electronic control architecture.

All data management functions are removed, leaving only basic motion control logic in the PLC. Advanced intelligent functions including automatic fault diagnosis, real-time operation data recording, abnormal condition early warning, production data traceability, and system log storage are completely cancelled. When failures such as system stuttering or shutdowns occur, the system provides no records or prompts. Fault location relies entirely on manual inspection, extending downtime and increasing maintenance costs.

Safety control logic is drastically simplified. Core protection programs such as multi-station interlock logic, hardware emergency stop loop, hierarchical operation authority, misoperation prevention interlock, abnormal condition self-locking, and over-limit forced shutdown are deleted. The lack of safety protection mechanisms leads to failure of automatic interlock protection during misoperation, abnormal station operation, or overload conditions, easily causing machine collision, structural damage, and workpiece scrapping accidents.

Standard operation workflows are extremely simplified, including manual debugging, automatic operation, and fault reset processes. Program redundant verification logic, dual-backup control programs, and fault tolerance mechanisms are removed with no emergency buffer or backup operation solutions. Signal delay, signal loss, or program stuttering will cause sudden shutdowns or misoperations, sacrificing equipment stability, safety, and intelligence. Such equipment is only suitable for low-end and rough production scenarios.