Direct on load line starter

by Joost Nusselder | Updated on:  July 24, 2021
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It’s common to see DOL motors in the heavy machinery industry, but it can be a risky decision when dealing with industrial equipment. This is because higher powered motors are wired as DOL and this causes excessive voltage drop in the supply circuit. To avoid overloading and crashing circuits, make sure your motor has enough thermal capacity so that you’re not trying to start an already hot machine at full load!

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What is a direct on line starter?

Direct on line starters are the simplest type of motor starter. They apply full voltage to the terminals and cubicle locations without any resistance or induction from other sources. This is because they do not require a connection with power lines in order for them to work, which means that direct online starters can be used if your electricity supply does not cause excessive voltage drop when starting up motors with high start-up currents.

What are the types of DOL starter?

The different types of DOL starters are Direct Online Motors, Contactsors and Thermal Overload Relays. They also deal with the wiring diagrams for your DOL starter along side Wire A to wire B Wiring scheme.

What is difference between VFD and DOL starter?

The difference between VFD and DOL starter is that a VFD converts the AC line voltage to DC, inverts it back into an electric current for the motor. Whereas, with DOL methods have just basic starting capabilities whereas a VTFT has control throughout start up time.

How do you test a DOL starter?

It may be simple, but it must be done correctly. Quickly set up the board and turn on your breaker for the circuit with the starters in them; then press that ‘start’ button! You should hear what sounds like two little clicks: one from when those contactors are closed (or if you’re using an electric screwdriver to probe between each of these, feel how they pass through) and another once power is applied because now there’s juice flowing into this thing.

Why is a DOL starter used?

DOL starters are used in motors with high initial current demands to prevent power loss through voltage drop. They’re often utilized for small pumps, belts and fans due to their ability of has a quick response time which is necessary when starting loads that vary based on the load’s need.

Can we use a DOL starter for a 10 hp motor?

These motors are designed to work with surface and underwater electric pumps. The range includes control panels from 5.5 HP up to 150 HP, which can be used in conjunction with one pump start system per panel or multiple units as needed depending on the size of your project!

Also read: these are the water filter vacuum cleaners you need for your next project

Joost Nusselder, the founder of Tools Doctor is a content marketer, dad and loves trying out new equipment, and together with his team he's been creating in-depth blog articles since 2016 to help loyal readers with tools & crafting tips.
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