Download e-book for iPad: Industrial Motor Control by Stephen Herman

By Stephen Herman

ISBN-10: 1133691803

ISBN-13: 9781133691808

Business MOTOR regulate 7E is a vital part of any electrician education. complete and recent, this booklet presents an important info on easy relay regulate structures, programmable good judgment controllers, and good country units typically present in an business surroundings. Written via a hugely certified and revered writer, you'll find easy-to-follow directions and crucial info on controlling commercial cars and conventional units in modern undefined. commercial MOTOR regulate 7E effectively bridges the space among business upkeep and instrumentation, providing you with a basic knowing of the operation of variable frequency drives, sturdy kingdom relays, and different purposes that hire digital units.

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Some overload relays do this by converting motor current into a proportionate amount of heat, and others sense motor current by the strength of a magnetic field. 2. They must have some type of time ­delay. Motors typically have a current draw of 300% to 800% of motor full-load current when they start. Motor starting current is referred to as locked rotor current. Because overload relays are generally set to trip at 115% to 35 Copyright 2012 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part.

Dashpot overloads generally provide some method that permits the relay to be adjusted for different full-load current values. To make this adjustment, the shaft is connected to a threaded rod (Figure 4–25). This permits the shaft to be lengthened or shortened inside the coil. The greater the length of the shaft, the less current is required to draw the shaft into the coil far enough to open the contacts. A nameplate on the coil lists the different current settings for a particular overload relay (Figure 4–26).

Motor starting current is referred to as locked rotor current. Because overload relays are generally set to trip at 115% to 35 Copyright 2012 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. 36 Chapter 4 Overload Relays 20 O TO HOT FF O N TO NEUTRAL AM P 15 AMPS © Cengage Learning 2014 CIRCUIT BREAKER AMMETER Figure 4–1 The circuit breaker does not protect the motor from an overload. Dual-Element Fuses There are some fuses that are intended to provide both short-circuit protection and overload protection.

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Industrial Motor Control by Stephen Herman


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