A request for electrical control system development usually arrives with a short description, a target budget, and a deadline. That is enough to start a conversation, but it is rarely enough to produce a design that can be ordered, wired, tested, and maintained. Before the first circuit is drawn, the integrator needs a clear set of inputs from your side. The more complete those inputs are, the fewer surprises appear during commissioning and after handover.
As an intelligent cleaning equipment manufacturer, Shenzhen PowerDe Automation Precision Equipment works on customized equipment and control-system projects where the machine, the process, and the operator all have to agree. The checklist below follows the order we typically use when a customer brief is turned into a quotation and a control design.
1. The process you want the control system to run
Start with the process, not the hardware. Describe the sequence from start to stop: what happens first, what has to happen in what order, and where the operator intervenes. State the cycle time you are aiming for, the shift pattern, and whether the line runs continuously or in batches.
Write down the physical variables that must be controlled or monitored for every station — temperature, pressure, flow, level, position, speed, torque, humidity — together with the ranges and the tolerance you actually need. A vague request such as "heat the tank" produces a different design from "hold the 80 L tank between 55 and 60 degrees Celsius while the pump is running". If a variable only has to be recorded and not controlled, say so; it changes the hardware list.
2. Existing equipment and interfaces
List every device the new control system has to talk to: existing machines, conveyors, pumps, valves, drives, sensors, scales, and inspection tools. For each one, provide the model number, the communication interface if it has one, and whether that interface is already enabled. A device that exposes Modbus but has the port disabled is a different job from one that has no digital port at all.
Include utility data for the installation: available supply voltage and frequency, compressed-air pressure and flow, water supply conditions, and any restrictions on power consumption per station. Electrical control designs fail at the utility boundary more often than in the code.
3. Production data and the information you need out of the system
Decide early what the system has to report. Counting parts, logging cycle times, recording temperatures for traceability, tracking downtime reasons, and pushing data to an MES or an ERP are all different requirements with different costs. If your plant already runs a supervisory system, provide the protocol it accepts and the data model it expects.
State who will read this information and how often. A maintenance supervisor checking alarms once per shift and a quality team auditing every batch need different interfaces and different retention rules.
4. Safety, interlocks, and stop behaviour
Provide the hazard list: guards, light curtains, e-stops, interlocked doors, and any area where a person can be exposed to heat, moving parts, or pressure. For every stop condition, define what the machine must do — cut power, hold position, vent pressure, or finish the current cycle. Ambiguity here is the most expensive item to fix after wiring is complete.
Tell the integrator which standards your customers or your own insurance require, and identify anything already certified. If you are buying industrial steam cleaning equipment or a high-temperature process unit as part of the project, the safety design has to cover both the machine and the control system together, not in isolation.
5. Maintenance, spares, and who owns the code
Define who will maintain the system after handover. If your own technicians will service it, the design should use components you can source locally and documentation they can read. If the integrator will support it, agree response times, remote access rules, and the escalation path in writing.
Clarify ownership of the program, the drawings, and the parameter backups, and how future changes will be requested. A change control process agreed at the start is far cheaper than a reverse-engineering exercise two years later.
6. Site conditions and the commissioning window
Give the physical constraints: available floor space and footprint, access routes for delivery, ambient temperature and dust or moisture exposure, and any restriction on when work can be done. Identify the shutdown window you can offer for installation and the earliest date your product can be supplied for real trial runs. A control project that cannot be tested against real product is not finished, only assembled.
7. Budget shape, schedule, and acceptance
Provide a realistic budget range and the date the system must be running, plus your commercial terms. A budget range lets the integrator propose a sensible architecture instead of a single optimistic design that fails value engineering later.
Most importantly, define acceptance in measurable terms before the design is fixed: the cycle time, the availability, the tolerances, and the test that proves them. If acceptance is agreed up front, both sides spend the project working toward the same line.
A practical way to package the brief
Put the information into a short document with the following contents:
- Process description and sequence, including cycle time and shift pattern
- List of variables to control or monitor, with ranges and tolerances
- Existing equipment list with models and interfaces, plus utility data
- Data reporting requirements and the target system for that data
- Hazard list, interlocks, and required stop behaviour
- Site constraints and the installation and trial window
- Budget range, required on-date, and the acceptance test you will apply
If you cannot answer every item, say which ones are still open and treat them as design decisions to resolve together with the integrator. The goal is not a perfect brief on day one; it is a brief with no hidden assumptions.
When those inputs are on the table, automated production line solutions can be specified against real process requirements rather than guessed, and the quotation you receive is one you can compare with a competitor on the same basis. Send us the process description and the open points, and we will tell you which of them have to be closed before the design is frozen.
