By Fawnia Leroy. wiring. Published at Tuesday, March 26th, 2019 - 19:11:41 PM.
In power engineering, a one-line diagram or single-line diagram (SLD) is a simplified notation for representing a three-phase power system. The one-line diagram has its largest application in power flow studies. Electrical elements such as circuit breakers, transformers, capacitors, bus bars, and conductors are shown by standardized schematic symbols.[
For wiring a single-phase motor, the most important objective is to distinguish the starting circuit from the main winding. These two circuits are isolated from one another electrically if the lead wires are separated and not in contact with each other. Initially, the ohmmeter can be used to determine which wire belongs to which circuit as well as checking continuity between leads. You should be able to isolate into two groups any leads which have continuity with one another. The starting circuit is likely to isolate to two leads, the running circuit may have two or more leads that show continuity. If the running circuit has more than two leads, you will need to determine how those leads are to be used for voltage or speed changes.
For example, let’s say the red probe of the voltmeter is initially connected before the CR contact to read line voltage, which is 115 V in this example. If the CR contact is electrically closed when the red probe is placed after the CR contact, the voltmeter should again read 115 volts. If the voltmeter reads 0 V, the CR contact is electrically open. This process can be repeated for all of the switches in the circuit. Again if line voltage is read before a switch and after the switch, the switch is electrically closed.
The largest reading was from 1 to 3, and would be the reading through both windings so that would be from 1 through common to 3. This tells you that the 2 terminal is the common terminal. “You have identified the “C” the common terminal as the number 2 terminal,” Bob explained. ”Now we know from process of deduction what the other 2 terminals are. The shortest winding with the least resistance is the run winding so terminal 2 to terminal 1 is the smallest resistance making the 1 terminal the “R” run terminal. The only terminal we have left is the “3” terminal and that makes it the start terminal. You can now take the red wire and put it on the run terminal, the white wire on the common terminal and the black wire on the start terminal.
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