Capacitor connections

Thread Starter

Demortda

Joined Mar 27, 2025
3
I have a waterpump that has 3 connecting wires coming from the motor, they are red, green and green &yellow (which is earthed). There is a plastic connecting block that has the connections for the power in and out, one and for a 4 pin capacitor to be plugged into the same. I presume that the red wire is plugged in to connect with the positive input connection the neutral connection is connecting to one side of the 4 pin capacitor. Therefore are the power connections across the capacitor and the earth wire left to connect to one side of the capacitor
I have load a few pictures that might help with my query
Cheers Demortda20250327_183600.jpg20250327_183647.jpg20250327_183843.jpg20250327_184009.jpg20250327_185709.jpg20250327_185907.jpg
 

Thread Starter

Demortda

Joined Mar 27, 2025
3
Thanks Ian0, for the quick responce
yes that is the case,two blades, that has another two blades below them in parallel. In image, 20250327_185907.jpg, it shows underneath the plastic block, how the capacitor is attached, with the right hand plugged blade into one of the input/output connection, the other is in the right hand corner of the block. I have assumed that this one is that connects to the red wire connected to the positve input, the other blade that is plugged into the block, lefthand side,is plugged into a blank connection, leaving the visible blades of the capacitor. So to what blade is the green lead from the motor plugged into, and that leaves, I presume, the green & yellow wire plugged into the remaining free blade
 

Ian0

Joined Aug 7, 2020
13,131
I suspect you have a split-phase capacitor run induction motor.
In which case, the live will go to one lead of the motor, the neutral will go to another, and the third lead will go from live to the motor via the capacitor. The spare terminals on the capacitor will be used to connect the live.
Not all split-phase induction motors are the same. Some have two windings with equal resistance, so have different resistances.
 

Thread Starter

Demortda

Joined Mar 27, 2025
3
So that means that the live lead (red), would be attached to the spade terminal that is connected to the left hand terminal screw (As in the top image,20250327_185709.jpg), on the top of the plastic connection block, the other screw terminal, right hand screw, connects directly to the left hand, top,capacitor spade, that is plugged into the connector block, the other top capacitor spade is plug into a dead end socket on the connector block.That leaves the two capacitor spades (20250327_185907.jpg) which are connected parallel to the two spades plugged into the connector block. The two remaining wires coming from the motor the green (which seems to be the neutral return from the coils, and the green & yellow wire which goes to earth). So does the green wire connect to the capacitor spade that is connected parallel spade connecting to the neutral return screw connector leaving the earth wire to connect to the free spade that is in parallel to the one plugged into the dead end socket or are the two motor wire connected in reverse
 
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