1. Before energizing the motor feeder, check movement of each contactor by means of manually pressing the moving bridge.
2. Ensure that all the connections are fully tighten as per the required force (NM) value of each screw/bolt.
3. Ensure that shorting links at star contactor are intact & tighten.
4. Ensure that control fuse carrier with HRC fuse is intact and in case of MCB, it is in ‘ON’ position.
5. Incase terminal provided for external additional interlock have not been used, a shorting link must be provided.
6. Incase terminal provided for start/ stop operation through BMS have not been used, do not provide shorting link between these two terminals.

Philosophy of Operation

• Start push button gives command to Star/Delta timer.
• The same command goes to Star contactor through NC contacts of timer and Delta contactor.
• After energizing Star contactor, it gives start command to Line contactor through NO contact of Star contactor
• Once Line contactor get energize, it gets sealing command from its own NO contacts.
• Motor starts on Star connections.
• After prefix time the timer disconnect control supply to Star contactor and give supply to Delta contactor through NC contact of Star contactor, now motor runs on Delta circuit.