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9th December 2017, 02:45 PM #31Novice
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Hi Dave I was referring to the first post where Baz asked if the 20amp breaker should be larger.
What is this current limiter at the plug. I haven't seen these
Cheers matt
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9th December 2017, 06:17 PM #32GOLD MEMBER
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Yes you probably have. I was referring to a surge protector on a GPO or a current arrestor on a multi plug board. This way you can protect yourself from a shock from a specific outlet but allow the main circuit breaker for the entire circuit to be less sensitive.
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9th December 2017, 07:11 PM #33.
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Most current limiters on adapter boards don't behave like a proper breaker in that they really are limited to the current they are rated for hence they don't allow for momentary start up currents that temporarily exceed their rating. This makes them inoperable on most motors larger than about 2HP.
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9th December 2017, 07:46 PM #34GOLD MEMBER
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Yes that's probably true of the cheapies. You need to get one specific to the likely current. For example take a look at the ones designed for worksite use. I run over 12 amps on one of these for up to a minute without problems. There's also larger ones designed for temporary use outside. Not the little cheap ones designed to run your Christmas tree.
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9th December 2017, 09:00 PM #35.
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10th December 2017, 03:55 PM #36
So I managed to get out to the shed and try starting the saw without the belts on. And it started.
Yay!
So I ran it for 30 seconds and turned it off. I let it come to a complete stop and attempted to start it
again and it tripped the breaker. Reset breaker and it started.
It continued start after reset but trip on the second start.
So I am thinking it maybe just the ‘curve’ of the breaker.
The electrician will be here tomorrow at 1100 so I am hoping he can have it sorted fairly
quick.
Thank you to every one who has taken the time to reply.
I will let you know how I go with the sparky.
Cheers.
Baz
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11th December 2017, 09:03 PM #37Novice
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11th December 2017, 09:05 PM #38Novice
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I would test insulation resistance on your saw and hard wiring and if ok check the rcd trip times and sensitivity and if ok try a d type breaker
Cheers matt
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18th December 2017, 09:20 AM #39
So my saw is going now and still none the wiser. Sparky failed to show and being stuck on night shift and long hours had no time to chase him up.
What I have done is take the belts off and got it to start. It did trip the breaker/RCD after the first start.
Left it for a few days and got out to the shed for a bit more of a play. No belts on - start first time, second time, third time and so on.
Put belts and blade back on and it started no problem.
I have ripped a couple of 70x35 pine studs and the saw didn’t miss a beat.
While i wish I knew what the problem was I am very happy to have the saw going.
I just hope it doesn’t do it again.
Thank you to all who have replied your help is appreciated.
Cheers
Baz
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18th December 2017, 09:31 AM #40
Hi,
It will probably have been moisture in the works. this is quite common in heating devices, I have a heater that has to be warmed on a non protected circuit the first time every Winter and then is OK. New stoves are a common offender, very likely you had the same problem with the insulation of your motor.
RegardsHugh
Enough is enough, more than enough is too much.
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18th December 2017, 09:55 AM #41
I do suspect moisture could have been the issue.
It was a very humid at that time.
Also the belts were very stiff and perhaps contributed to the tripped breaker.
Is there a way of keeping the moisture out? Possibly cover motor and put some sort of moisture absorbing
stuff in there. Actually would a hair dryer do the trick?
Cheers.
Baz
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18th December 2017, 07:52 PM #42GOLD MEMBER
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Another thing to consider is if there's any possibility that other wiring could be coming off that circuit. For example going to the laundry.
I only realised last month that someone has tapped into the circuit before it gets to my shed. I think it's the laundry but I haven't researched it properly.
So the circuit I thought was dedicated to the shed, isn't at all.
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18th December 2017, 08:26 PM #43Another thing to consider is if there's any possibility that other wiring could be coming off that circuit.
And I made sure nothing else was plugged into the circuit.
Cheers.
Baz
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19th December 2017, 07:12 PM #44
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19th December 2017, 08:15 PM #45Woodworking mechanic
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I’m not an electrician, but i’d Be worried about a circuit than may trip due to humidity/moisture in the air. To me, that circuit must be right on the limit. If it was me, i’d Be upgrading to a higher breaker value and wiring (if required).
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