On Dec 28, 6:06=A0pm, "[email protected]" <[email protected]> wrote:
> Jointer tries to start, partially revs up and then breaks the circuit.
That's a motor drawing too much current for the breaker.
Either there's other loads on the breaker, or the motor
is oversize for that circuit, or maybe the motor or breaker
are faulty. Check the motor dataplate for ratings
and compare to your breaker size first.
If it is just starting and doesn't move out -
One of two possible conditions:
The start winding has a bad capacitor - open. Common.
The run winding is in parallel and normally a switch is opened
when the motor is up to speed - taking out the start winding/cap circuit.
The load on the motor - spindle and knives turning is to much for
the 'keep alive' winding that is used to keep it at speed once there.
It isn't strong enough to get a loaded system up to speed and draws
to much current.
The other possibility is the run cap (if you have one) is shorted
and the run winding isn't in circuit, start winding gets it up to speed
and switches off. Motor spins down.
Martin
On 12/28/2010 8:06 PM, [email protected] wrote:
> Jointer tries to start, partially revs up and then breaks the circuit.
> Any thoughts?
Is it a 220 unit working on 110? or vice versa?
Has it been running before in your shop or is this the first time?
On 12/28/2010 9:06 PM, [email protected] wrote:
> Jointer tries to start, partially revs up and then breaks the circuit.
> Any thoughts?
In article <[email protected]>,
dpb <[email protected]> wrote:
> [email protected] wrote:
> > Jointer tries to start, partially revs up and then breaks the circuit.
> > Any thoughts?
>
> Undersized wiring leading to excess voltage drop and hence high current
> demand or bad bearings or similar in motor or possibly jointer head.
> Check (w/ unplugged, of course) that it turns easily by hand w/ no
> bearing noise, etc., for the latter.
>
> What's the voltage/HP/wiring size/fusing?
>
> --
...or, if it used to work, and the mechanical parts check out OK,
electrical connection going bad (find & fix it before you have a fire
from it.)
--
Cats, coffee, chocolate...vices to live by
Sounds to me like the starting winding isn't disconnecting.
Pete Stanaitis
-------------------
whit3rd wrote:
> On Dec 28, 6:06 pm, "[email protected]" <[email protected]> wrote:
>
>>Jointer tries to start, partially revs up and then breaks the circuit.
>
>
> That's a motor drawing too much current for the breaker.
> Either there's other loads on the breaker, or the motor
> is oversize for that circuit, or maybe the motor or breaker
> are faulty. Check the motor dataplate for ratings
> and compare to your breaker size first.
[email protected] wrote:
> On Tue, 28 Dec 2010 20:06:48 -0600, "[email protected]"
> <[email protected]> wrote:
>
>> Jointer tries to start, partially revs up and then breaks the
>> circuit. Any thoughts?
>
> If this is a new problem, it could be the centrifugal switch.
Centrifugal switch = gizmo on the non-business end of a motor that
disengages the start capacitor when sufficient RPMs are reached.
[email protected] wrote:
> Jointer tries to start, partially revs up and then breaks the circuit.
> Any thoughts?
Undersized wiring leading to excess voltage drop and hence high current
demand or bad bearings or similar in motor or possibly jointer head.
Check (w/ unplugged, of course) that it turns easily by hand w/ no
bearing noise, etc., for the latter.
What's the voltage/HP/wiring size/fusing?
--
I would like to fourth the start winding, except it won't be the winding but
rather the disconnectin switch, usually centrifigal. Windings don't burn
out, usually and if it was a cpacitor it wouldn't start turning well and
once up to speed it wouldn't make a difference. Make sure you clean off the
WD-40 when you are done loosening it up and lube with a dry lube. Clean
contacts well, They make be pitted beyond function but usually can be
reshaped for a few months more.
"[email protected]" <[email protected]> wrote in message
news:[email protected]...
Jointer tries to start, partially revs up and then breaks the circuit.
Any thoughts?
On Tue, 28 Dec 2010 20:06:48 -0600, "[email protected]" <[email protected]>
wrote:
>Jointer tries to start, partially revs up and then breaks the circuit.
>Any thoughts?
If this is a new problem, it could be the centrifugal switch.