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EATON Definite Purpose Starters, 1 Phase
Eaton definite purpose starters are electrically operated switching devices used for heating, ventilation, air conditioning and refrigeration.
Working Mechanism
- A power source is connected to these Eaton definite purpose starters consisting of a contactor, overload relay and control circuit.
- When the starter is energised, the contactor closes to flow power to the motor.
- The control circuit monitors the motor's current, and if it exceeds a pre-set level, the overload relay will trip, thus opening the contactor and stopping the flow of power to the motor.
- The overload relay protects the motor against overloading, short-circuiting and electrical faults to prevent damage and hazards.
- If the motor is required to run in the opposite direction, a reversing starter can be used to reverse the motor's rotation by changing the polarity of the power supply.
Features
- These starters have NEMA-rated enclosures to protect from dust, dirt and accidental human contact.
- They feature lug ring terminals for added wire strength and structural rigidity.
- These bi-metallic starters offer overload trip indication to prevent short circuits.
Standards and Approvals
- UL
Frequently Asked Questions
What are the differences between definite purpose starters and general purpose starters?
Definite purpose starters are designed for a specific application, while general-purpose starters can be used for a variety of applications. Definite purpose starters are typically more compact and have lower current ratings than general-purpose starters. They also provide more precise control over the motor and can offer additional protection against overload and short circuits.
What are non reversing starters?
Non reversing starters control starting, stopping and protection of a three phase AC motor. They are only designed to allow the motor to move in one direction and cannot reverse the direction.
How to maintain these starters?
- Inspect the starter regularly for signs of damage or wear.
- Check for loose connections, damaged wires and signs of wear and tear that may affect the starter's performance.
- Verify that the overload relay is functioning correctly by checking its settings periodically.
- Ensure the relay is set to trip at the correct current level to protect the motor from overloading.
- Clean the starter's surfaces and internal components regularly to remove dirt and dust that may affect its performance.
- Check the lubrication points on the starter and lubricate them as needed.
- Perform regular testing of the starter's operation to ensure it is starting and stopping the motor correctly.
- Replace any worn or damaged components as needed.
How to install Eaton definite purpose starters?
- Turn off the power to the motor and disconnect it from the power source.
- Mount the starter securely in a suitable location near the motor.
- Connect the power wires from the power source to the starter's line terminals.
- Connect the motor wires to the starter's load terminals.
- Connect the control circuit wires from the starter to the motor's control circuit.
- Install the overload relay in the starter and ensure it is set to trip at the correct current level.
- Turn on power to the motor and test the starter's operation.
How do I choose the right definite purpose starter for my motor application?
- Consider the motor's horsepower and voltage rating.
- Determine the current level and type of the motor.
- Check the environmental conditions in which the motor will be operating, such as temperature, humidity and potential exposure to dust, dirt or other contaminants.
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