Blogs

Oil Resistor Starters: These workhorses manage the starting sequence of large motors. We recently serviced oil starters on a mill and a fan that revealed just how applicable proactive maintenance can be. If you’re operating oil resistor starters manufactured more than 15-20 years ago, especially if you’re experiencing any of these symptoms: Unreliable starting sequences […]

1. Major findings While refurbishing this old EPM3 LRS on a shredder, severe arcing damage was found where the busbars pass through the shorting contactor floor into the tank. The arcing was between the busbars and the metalwork of the busbar floor, hidden by the top slit-plate and a bottom pipe flange. It only became

To answer this question, we need to start by answering: What is the difference between ‘Starts per hour’ and ‘Number of consecutive starts’? How can it used to specify an LRS for an 8MW Ball mill at an ambient temperature of 42°C? A) Starts per Hour * “Starts per Hour” is defined for the purposes

Question: The LRS installed on a 1MW crusher is experiencing trips. What about a soft starter solution? According to our understanding a soft starter will not be able to supply the required starting torque for this application? What are the preferred starting methods for MV slip ring motors sized at about 1MW? Answer: With a

INTRODUCTION A wound-rotor motor, also known as slip ring-rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. Adjusting the resistance allows control of the speed/torque characteristic of the motor. Wound-rotor motors can be started with low inrush current, by inserting high resistance into the