My inspection of the start switch leads me to believe that it is mechanistically OK, it seems to work smoothly. That being said it very well could be that the switch is cycling during operation when the load on the pump in increased and the motor slows. I am going to replace the run and start...
I suppose that the caps could be wired wrong but if they are then they were wired wrong for about 2 years before I had any problems. When I replaced the start cap I didn't touch the other cap to make sure I didn't screw anything up. Now again I know very little about all of this ( I enjoy...
Composite pro,
I have wondered whether the temp is too high as the start cap has a temp rating of 65 degree C. but until recently I have had no problems (+2 years) and I have actually increased the air flow around the pump by removing a door. The pump is generally operating at full vacuum (0.1...
I should note in response to your idea that it is difficult to hear the click when the vacuum pump is turned on (just checked a working similar model) as the motor gets up to speed pretty fast. Faster than 1 sec, contrary to my original post. When you shut it off though and the motor slows...
So there are 2 capacitors both relatively large. The first is a Cornell-Dubilier PSU16115 (161-193 uF, 125V) as mentioned above. This is the one that has ejected goo both times. The second is an Aerovox Z23P2425M21 (25 uF, 240V). The first is designated as a motor start cap by CDE and the...
Let me preface this by saying I have very little knowledge of electrical engineering, but I have learned a lot since trying to fix this problem.
I have a Welch Vacuum Pump which contains an Emerson 8917A motor (0.5 HP, single phase, 120V, 4.6 amps). The start capacitor (161-193 uF, 125V)...
