General Overview of Motor Starters

To safely start and stop the motor and provide running (overload) protection.

It energizes to attract the armature, which closes the contacts to start the motor.

The clapper type uses a swinging motion while the vertical lift type operates with an up-and-down motion.

<p>Reversing operation, speed control, and remote control operation.</p> Signup and view all the answers

<p>It provides protection from running overload conditions by interrupting the motor circuit.</p> Signup and view all the answers

<p>When the START button is pressed, it energizes the coil, closing the main power contacts and the seal-in contact, allowing the motor to run continuously even after release.</p> Signup and view all the answers

<p>The seal-in contact maintains the flow of current to the coil after the START button is released, ensuring the motor remains energized.</p> Signup and view all the answers

<p>Under-voltage protection de-energizes the coil and opens all starter contacts during a power failure, requiring manual restart when power is restored.</p> Signup and view all the answers

<p>A pilot light indicates the operating status of the motor and is wired in parallel with the coil of the magnetic starter, energizing whenever the coil is activated.</p> Signup and view all the answers

<p>Pressing the STOP button opens the normally closed circuit, de-energizing the coil and causing all magnetic starter contacts to open, stopping the motor immediately.</p> Signup and view all the answers

<p>A heater element and a normally closed auxiliary contact.</p> Signup and view all the answers

<p>Using three single-pole OLRs or a single three-pole OLR with one auxiliary contact.</p> Signup and view all the answers

<p>It must correspond with the nameplate current rating of the motor.</p> Signup and view all the answers

<p>Determine the cause of the overload, wait for the OLR to cool down, and reset the OLR.</p> Signup and view all the answers

<p>By observing a protruding plunger, a flag, or a coloured disk.</p> Signup and view all the answers

<p>To start the motor using full-line voltage.</p> Signup and view all the answers

<p>Disconnect switch, overcurrent protection, HP-rated contacts, OLR heaters, and the motor.</p> Signup and view all the answers

<p>It is powered by two of the three phase line conductors taken from the motor circuit.</p> Signup and view all the answers

<p>Both the motor circuit and control circuit are de-energized.</p> Signup and view all the answers

<p>It helps ensure safe installation and troubleshooting of motor control systems.</p> Signup and view all the answers

<p>The STOP buttons are connected in series.</p> Signup and view all the answers

<p>The float switch controls the magnetic starter by opening or closing contacts based on the water level.</p> Signup and view all the answers

<p>The START buttons are wired in parallel, allowing any button to start the motor.</p> Signup and view all the answers

<p>An overload relay indicates a protective device that prevents the motor from overheating.</p> Signup and view all the answers

<p><code>R</code> signifies a red indicator light that shows the status of the motor.</p> Signup and view all the answers

<p>Reversing motor direction, speed control, and providing overload protection.</p> Signup and view all the answers

<p>A magnetic contactor controls high-power loads, while a magnetic motor starter includes additional protections like overload relays for motors.</p> Signup and view all the answers

<p>The power circuit delivers electrical power to the motor, while the control circuit manages the operation of the power circuit through signals.</p> Signup and view all the answers

<p>A bimetallic strip and an electrically operated contact mechanism.</p> Signup and view all the answers

<p>It ensures appropriate thermal protection for the motor under normal operation conditions.</p> Signup and view all the answers

<p>The magnetic part comprises a solenoid coil, stationary electromagnet, magnet shading coils, and a moving armature.</p> Signup and view all the answers

<p>The movable contacts are connected to the armature, while the stationary contacts remain fixed and engage with the movable contacts when energized.</p> Signup and view all the answers

<p>Pressure springs ensure that the movable contacts are firmly pressed against the stationary contacts when closed, providing reliable conduction.</p> Signup and view all the answers

<p>Vertical motion allows for a more compact design, enabling effective operation with minimal space while ensuring that contacts make and break cleanly.</p> Signup and view all the answers

<p>Activating the solenoid coil generates a magnetic field that pulls the armature down, closing the movable contacts with the stationary contacts.</p> Signup and view all the answers

<p>25 hp</p> Signup and view all the answers

<p>No, a Size 6 starter cannot be used for 600 volts; it has no specified rating.</p> Signup and view all the answers

<p>60 hp</p> Signup and view all the answers

<p>2 hp</p> Signup and view all the answers

<p>200 hp</p> Signup and view all the answers

<p>The arrangement allows each heater to operate independently with a single OLR contact controlling multiple heaters.</p> Signup and view all the answers

<p>Placing the n.c. OLR contact ahead of the STOP button ensures that overload protection is maintained even when the motor circuit is stopped.</p> Signup and view all the answers

<p>A schematic diagram would use one OLR contact when each of the heaters is designed to operate just one master set of contacts.</p> Signup and view all the answers

<p>The OLR protects the motor circuit from overload conditions by automatically disconnecting power when current exceeds a preset limit.</p> Signup and view all the answers

<p>Understanding this concept is crucial for effective troubleshooting and for ensuring safe operation of multiple heaters on a single control circuit.</p> Signup and view all the answers