A useful MCC brief connects every motor to its starting method, protection, control interface and operating duty. Resolve those details alongside the supply, enclosure and installation requirements before ordering equipment.
1. Build a motor schedule that can be used
| Field | Why it matters |
|---|---|
| Tag and description | Connects the motor to drawings, labels and process equipment. |
| Rated voltage, kW and current | Establishes equipment selection inputs. |
| Duty and starting frequency | Affects starter selection and thermal duty. |
| Starting method | Identifies DOL, soft starter, drive or another arrangement. |
| Motor and process protection | Defines sensors, trips and reset requirements. |
| Local and remote controls | Defines selectors, I/O, status and communications. |
| Supply and installation notes | Records cable information, location and special constraints. |
Use one row per motor and identify spare or future circuits separately. Mark uncertain data rather than assigning a generic value. Name the person responsible for confirming the schedule.
2. Resolve drive location and thermal duty
Identify which drives are supplied by CWS, by another contractor or as part of packaged equipment. Confirm exact models when selected, and provide manufacturer data needed for heat, clearance, ventilation and protection design.
A drive can be integrated in a suitable assembly or housed separately. The decision should account for heat, EMC, harmonic effects, cable routes and maintenance. Avoid both blanket rules: “all drives go inside” and “drives can never go inside”.
3. Define how the process operates
- Local/off/remote operation and command priorities.
- Permissives, interlocks, trips and reset conditions.
- Loss-of-power and restoration behaviour.
- Emergency-stop and other safety functions, with the responsible safety designer identified.
- PLC I/O, network protocol, addresses and signal lists.
- Interfaces to vendor packages, field devices and SCADA.
A network protocol name is not a control philosophy. Agree who develops and validates the logic, who loads software, and who performs the site checks.
4. Specify the physical arrangement
Confirm the supply and fault requirements, form of separation, fixed or withdrawable arrangement, cable terminations, environment and access. The spare allowance must distinguish unpopulated space from equipped ways and usable electrical capacity.
5. Agree testing and handover
List the assembly verification records and functional tests. For a witnessed FAT, agree the test script, simulated signals, acceptance criteria and treatment of outstanding items. Confirm which external devices and software will actually be available for the test.
CWS supplies MCC manufacturing with project-specific documentation and interfaces. For a first introduction, read what an MCC does. For procurement, send this schedule with the single-line diagram and control philosophy so the proposal covers the same scope your installation team expects.