
By Stephen Herman
The hot and up to date sixth variation of commercial Motor regulate is the main entire revision of the booklet because it used to be released over twenty years in the past. With the most important, up to date details on easy relay keep watch over structures, programmable common sense controllers, and stable kingdom units normally present in an business environment, this ebook is a must-have. It offers easy-to-follow directions and the fundamental info for controlling commercial automobiles, in addition to everyday units in modern commercial settings. assurance is thorough in scope, effectively bridging the space among commercial upkeep and instrumentation. Readers will achieve a basic knowing of the operation of variable frequency drives, sturdy nation relays, and different purposes that hire digital units.
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Example text
Circuit does exist because something is holding the contact closed. A very good example of this type of switch is the low pressure switch found in many air conditioning circuits (Figure 2–19, page 19). The low pressure switch is being held closed by the refrigerant in the sealed system. If the refrigerant should leak out, the pressure would drop low enough to permit the contact to return to its normal open position. This would open the circuit and de-energize coil C, causing both C contacts to open and disconnect the compressor from the power line.
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).
Any normally open contacts will close, and any normally closed contacts will open. When the coil is de-energized, the contacts will return to their normal state. Figure 2 – 13 Push-pull button with two normally closed contacts. ) are labeled CR. All of these components are physically located on control relay CR. 2. Schematics are always drawn to show components in their de-energized, or off, state. 3. Any contact that has the same label or number as a coil is controlled by that coil. In this example, both CR contacts are controlled by CR coil.