Installation and wiring of a three-phase induction motor control system during my internship period. This includes assembling the power line, control line, and verifying protection devices based on the provided single line diagram.
This project was completed during my internship as part of the electrical maintenance team.
I was responsible for wiring and assembling a three-phase motor control system, starting from
the main distribution panel (MDP) to the sub distribution panel (SDP). The installation was
based on the provided single line power plan, while the rest of the control logic, including
interlocking and protection, was implemented directly on-site.
The purpose of this project is to ensure the motor can operate safely with proper overload
protection, short-circuit protection, and clear separation between the power line and control line.
In future revisions, I plan to add a simplified Star-Delta diagram that I created to support the
documentation process.
Wiring three-phase power from MDP to SDP based on the single line diagram. This includes circuit breakers, contactors, thermal overload relay, and routing cable management.
Building the control logic for motor operations such as start, stop, interlock, and safety protection. The wiring includes push buttons, control relays, and terminal blocks.
Performing continuity tests, insulation checks, and verifying the correctness of motor rotation and control responses after wiring is completed.
The complete wiring diagram was not provided during the internship, but the installation followed the available single line plan (MDP to SDP). For documentation purposes, I added a Star-Delta diagram that I recreated based on the control system used on-site.
The motor control system was successfully installed and operated without wiring issues. The rotation direction, protection devices, and interlocking logic worked properly after testing. This project also improved overall panel documentation by adding a clearer Star–Delta reference diagram.
One of the challenges was working with incomplete wiring documentation. I had to interpret the single line diagram and collaborate with senior technicians to confirm the required control logic. Through this project, I learned proper three-phase wiring standards, panel safety procedures, and practical installation techniques such as cable routing, ferrule labeling, and terminal mapping.