Re: Replace combined capacitors in a power tool.
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legg
Aug 8, 2022, 6:15:05 PM8/8/22
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On Mon, 08 Aug 2022 20:10:56 +0100, Charlie+ <cha...@xxx.net> wrote:
>On Mon, 08 Aug 2022 07:49:06 +0100, Charlie+ <cha...@xxx.net> wrote as
>underneath :
>
>>Advice please..
>>This is a 250V 1450W Circular saw US made in the 1980s probably.
>>AEG CS825, It failed in use yesterday blowing fuses having been stored
>>in a garage. Dismantle reveals a leaking swelled combined (film)
>>capacitor 0.3uF + 2x 2500pF XY type 250V~ with 3 leads one coloured and
>>2 black. Too old for spare parts.
>>Presumably I can replace with X rated 250v or better individual caps but
>>I dont know enough!
>>Is the 0.3 for starting and the small two for anti interferance perhaps?
>>TIA C+
>
>Actually it is a brushed (universal type) motor so it wont be for
>starting. It will all 3 capacitors be for limiting interferance but I
>dont know what the circuit would be. C+
These are for line filtering - They are only really effective if the
line power enters and leaves the cap body on separate wires, so their
replacements' location anywhere near the line power exit should be
just as effective.
Use an X-rated part across the line, and Y-rated parts to the grounded
equipment metal body, from each line terminal. Capacitance equal to or
less than double the listed values.
RL
>On Mon, 08 Aug 2022 07:49:06 +0100, Charlie+ <cha...@xxx.net> wrote as
>underneath :
>
>>Advice please..
>>This is a 250V 1450W Circular saw US made in the 1980s probably.
>>AEG CS825, It failed in use yesterday blowing fuses having been stored
>>in a garage. Dismantle reveals a leaking swelled combined (film)
>>capacitor 0.3uF + 2x 2500pF XY type 250V~ with 3 leads one coloured and
>>2 black. Too old for spare parts.
>>Presumably I can replace with X rated 250v or better individual caps but
>>I dont know enough!
>>Is the 0.3 for starting and the small two for anti interferance perhaps?
>>TIA C+
>
>Actually it is a brushed (universal type) motor so it wont be for
>starting. It will all 3 capacitors be for limiting interferance but I
>dont know what the circuit would be. C+
These are for line filtering - They are only really effective if the
line power enters and leaves the cap body on separate wires, so their
replacements' location anywhere near the line power exit should be
just as effective.
Use an X-rated part across the line, and Y-rated parts to the grounded
equipment metal body, from each line terminal. Capacitance equal to or
less than double the listed values.
RL
legg
Aug 9, 2022, 10:10:37 AM8/9/22
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On Tue, 09 Aug 2022 07:37:07 +0100, Charlie+ <cha...@xxx.net> wrote:
>On Mon, 08 Aug 2022 18:15:55 -0400, legg <le...@nospam.magma.ca> wrote as
>underneath :
> RL - Thanks for the info, now I'll be able to re-create the circuit
>(the original cap. failed short circuit), though in this case the earth
>wire disappears into the motor but that is not external chassis
>connected, presumably because double insulated. Thanks, C+
If you can find any electrical contact to the disappearing third
)ground) wire, then that's the connection needed. Probably on the
body of the motor.
RL
>On Mon, 08 Aug 2022 18:15:55 -0400, legg <le...@nospam.magma.ca> wrote as
>underneath :
>(the original cap. failed short circuit), though in this case the earth
>wire disappears into the motor but that is not external chassis
>connected, presumably because double insulated. Thanks, C+
If you can find any electrical contact to the disappearing third
)ground) wire, then that's the connection needed. Probably on the
body of the motor.
RL
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