¡°is there any way that a 'NEMA motor starter with properly selected heater ' can be retrofitted to our 1/3 or 1/2 HP motors??¡°
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Yes, you can buy a brand new Nema size 00 Motor starter for single phase motors.
? They are NOT however cheap.
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Expect to pay anywhere from $70 to $300.
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You can also use an appropriately sized 3 phase one, just using a single phase of the unit.
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A motor starter consists of a Contactor (really a heavy duty relay) that does the switching,
and an overload relay, that senses the current, and some controls.
These can be added to any motor. They are completely external to them.
You nit the start button, that energizes the contactor, which seals in, and the motor starts,
when the OL relay sees too much current for too long, it opens the seal in circuit, and the contactor opens.
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The motors with built in protection have a device built in to the windings that acts (sort of)
as the relay and contactor combined. They actually provide better protection (since they sense
the ACTUAL temperature of the motor winding, rather than a guess at it) but are not as durable (IMO).
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In EITHER case, NEITHER provide short circuit protection, so you need that in your circuit as well.
(but it is probably there already)
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OUR EMAIL ADDRESSES HAVE CHANGED
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R James (Jim) Klessig P.E. | Senior Power Systems Engineer |
Electrical Reliability Services, VERTIV
jim.klessig@..., jim_klessig@...
1876 Gwin Rd, Mckinleyville | CA | 95519 | USA
| Cell (707) 497-9611 | eFax 614-410-0653
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