It is currently 29 Mar 2024, 02:53
RogerS wrote:One of the motors in my Camvac started smelling very 'hot electric' and threw the RCD.
Am I right in thinking that this is terminal ?
Measuring resistance between live or neutral and earth is showing open-circuit (but it could be breaking down under 240v of course). Resistance between L and N is the same as the other motor.
9fingers wrote:RogerS wrote:One of the motors in my Camvac started smelling very 'hot electric' and threw the RCD.
Am I right in thinking that this is terminal ?
Measuring resistance between live or neutral and earth is showing open-circuit (but it could be breaking down under 240v of course). Resistance between L and N is the same as the other motor.
Am I right in thinking the camvac uses "spawn of the devil" brush motors. If so it is possibly that brush carbon thrown out by the motor is causing an earth leakage.
Patient dismantling and cleaning might get it running again.
Bob
RogerS wrote:9fingers wrote:RogerS wrote:One of the motors in my Camvac started smelling very 'hot electric' and threw the RCD.
Am I right in thinking that this is terminal ?
Measuring resistance between live or neutral and earth is showing open-circuit (but it could be breaking down under 240v of course). Resistance between L and N is the same as the other motor.
Am I right in thinking the camvac uses "spawn of the devil" brush motors. If so it is possibly that brush carbon thrown out by the motor is causing an earth leakage.
Patient dismantling and cleaning might get it running again.
Bob
Dead right...brush motor. Will probably stick further investigation as you suggest at location 1,344,555 on the TUIT list I still have one working.
9fingers wrote:RogerS wrote:9fingers wrote:..
Am I right in thinking the camvac uses "spawn of the devil" brush motors. If so it is possibly that brush carbon thrown out by the motor is causing an earth leakage.
Patient dismantling and cleaning might get it running again.
Bob
Dead right...brush motor. Will probably stick further investigation as you suggest at location 1,344,555 on the TUIT list I still have one working.
Ah then when the second one fails you will be up "dust creek without a collector"
Something to do when you wake up at silly o'clock in the morning maybe?
Bob
9fingers wrote:Just pausing for thought......
Motor smelling hot etc does not quite match tripping the RCD.
30ma trip at 240 v is 7.2 watts. not enough to raise enough heat to smell much? Maybe you meant it tripped the MCB perhaps?
Bob
RogerS wrote:Update. I don't think it is the brushes as I disconnected the motor so I could get easier access and undid the screws holding down the brush assemblies and there is a good 15mm + of brush in each of them. They also freely push in and out against the spring.
So unless anyone has any better idea, tomorrow I'll leave it turned on until the RCD trips and try and see what's happening. Fingers well clear.
9fingers wrote:RogerS wrote:Update. I don't think it is the brushes as I disconnected the motor so I could get easier access and undid the screws holding down the brush assemblies and there is a good 15mm + of brush in each of them. They also freely push in and out against the spring.
So unless anyone has any better idea, tomorrow I'll leave it turned on until the RCD trips and try and see what's happening. Fingers well clear.
But why is the brush guide on the pi88 with respect to the commutator?
....
Bob
RogerS wrote:9fingers wrote:RogerS wrote:Update. I don't think it is the brushes as I disconnected the motor so I could get easier access and undid the screws holding down the brush assemblies and there is a good 15mm + of brush in each of them. They also freely push in and out against the spring.
So unless anyone has any better idea, tomorrow I'll leave it turned on until the RCD trips and try and see what's happening. Fingers well clear.
But why is the brush guide on the pi88 with respect to the commutator?
....
Bob
Sorry Bob, I don't understand
Woodster wrote:Oh dear, that doesn’t look good! Shame as Camvac make what are normally the quietest shop vacs on the market. It would be nice to know what’s causing the fireworks.
9fingers wrote:If that was with no earth connected then I assume there is a similar firework display on the other brush viewed from behind, I'd say it is terminal.
if you only have sparking from one brush then is suggests the brush is not completely free to slide in the holder or its spring is very weak. The latter often cause by over heating in the brush itself and thus softening the steel in the spring. one effect reinforces the other.
Aldi have a workshop vac for £50 instore and online at the moment. just sayin'
Bob
9fingers wrote:....
Aldi have a workshop vac for £50 instore and online at the moment. just sayin'
Bob
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