ISE 10 – Mains Noise – Problem?

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  • November 11, 2021 at 2:22 pm #100231
    drummonkey
    Participant

    Hi, hope you’re all well.

    Long time no post! I have recently discovered a weird issue and was wondering if I need to be concerned?

    I have a valve guitar amplifier that works fine and also an ISE10 that I assumed was also working fine, I’ve noticed a problem with excessive mains noise on the amplifier before today however I assumed it was something else causing it. Today I could hear my washing machine downstairs on spin and the noise in the amplifier coincided with the spin speed of the washer. So I’ve likely found the culprit! It’s not massively loud but it’s there clearly, passing noise into the mains wiring.

    The washer is on a fused spur, on a seperate Kitchen ring from the upstairs ring main, they are both on the same side of the consumer unit though. I was probably about 2-3 metres away from the washer on the floor above.

    So the questions are, is this an issue or should I not be worried? Do all brushless DC motors produce RF when in use? Should I be checking something? Is there a mains suppressor on the motor?

    My ISE is from 2009, works fine with no issues now (had a problem with a control board and also the heater in its life), it was stored for 4.5 years unused however. Thanks

    November 12, 2021 at 10:01 am #479794
    iadom
    Moderator

    All domestic appliances have to have a mains suppressor fitted by law. It’s not on the motor, the mains cable feeds directly into the suppressor. Wouldn’t expect a 3 phase motor to cause much ‘noise’ though?

    November 12, 2021 at 2:47 pm #479795
    tubafan
    Participant

    Is it mains noise you are hearing or Radio Frequency pickup. I ask as I have a DAB radio sitting a couple of feet above our washing machine and the DAB reception drops right off when the washing machine motor is running. FM reception is not noticeably affected.

    November 12, 2021 at 3:36 pm #479796
    electrofix
    Moderator

    at that distance its possible

    I had a plug in car charger the affects the radio in my car. so some of these appliances can affect radios close to them

    I agree its not supposed to but it does

    Dave

    November 15, 2021 at 9:45 am #479797
    drummonkey
    Participant

    Thanks all, it’s definitely noise migrating into the kitchen ring main from the washing machine. It was a cyclical noise coinciding with a wash and rinse drum rotation.

    [USER=”3176″]iadom[/USER] yeah I’ve seen the mains suppressor on the schematic, at the top where the mains comes in, could this wear out or become less effective over time perhaps? I’ve not noticed this issue as bad before tbh, but maybe I wasnt looking, hahaha.

    I guess I was concerned that some fault may develop putting safety at risk or something?

    Thanks all.

    November 15, 2021 at 11:48 am #479798
    iadom
    Moderator

    To be honest the only time I have changed mains suppressors on any appliance is because they have either gone down to earth or exploded. I suppose the only way to know would be to replace the mains suppressor.

    November 20, 2021 at 9:03 am #479799
    drummonkey
    Participant

    iadom wrote:To be honest the only time I have changed mains suppressors on any appliance is because they have either gone down to earth or exploded. I suppose the only way to know would be to replace the mains suppressor.

    Cheers dude, I have a spare somewhere I think. I might get it out and see if it helps.

    Thanks

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