meggers

Re: meggers

you have to remember that in use all machine are subject to 230v rms

rms means route mean square that is the equivalent dc voltage but the mains is a sinusoidal wave which means the max voltage is 1.4 times this which is 325 volts (and most voltages are higher than this)

at higher voltages you will get more leakage to earth from heaters etc so a 9v meter will not show it

since these leakage curents can upet electronics or trip rcd’s a megger can be a useful test

Dave

Re: meggers

adv wrote:just a quick question,never had a megger, never realy needed one. but what are its advantages.a no it puts 500v through.components. but what is it proveing?

In this game its vital to carry and use a megger (550v Insulation Tester) on every machine. It tells you far more about the state of the insulation (i.e motor windings and heating elements) than simple 9v digital test meters. Without a megger test faults such as you are experiencing will not show up any other way.

adv wrote:still stumpt on this candyd/w cdi1012 took to work shop. fitted new pcb, lights up but wont do nothing.

I wonder if LED’s P1 and P2 are flashing in this case?

Let me have your email address and I can send you some Candy test info if you like?

Re: meggers

You can get round the no megger problem temporarily by disconnecting components one at a time, then re-trying the machine. So heater would be first, I should think. If the machine starts up with heater disconnected then it could be that the element has a degree of earth leakage which, whilst not critical enough to blow the trip, is sufficient to cause the electronics to complain. If it makes no difference, re-connect it and try disconnecting the circulation pump etc.
The downside with this method is that machine may not work with some things disconnected but at least the error code would probably change, so it might give you some clues.
Have a look on e-bay. There are usually some perfectly good meggers on there, secondhand and cheap which will do till you’ve got time to choose a new one. Also google “test insulation resistance” and things like that.
Mike.
PS: In 90{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of cases, where there is earth leakage it will show up on an ordinary meter anyway. Disconnect component and test between one terminal and earth terminal using highest M’ohm range.

Re: meggers

Isn`t it now part of the law that all appliances are safety checked including insulation test, Earth loop impedance and earth continuity.

Your local HSE, trading standards and Public liability won`t be happy if one of your clients gets a death.

I don`t do anything without this little friend

http://www.pat-testing.info/ins-test.htm

http://www.pat-testing.info/legal.htm

Re: meggers

Martin wrote:

adv wrote:
i dont need a megger if a washer aint spinning. brushes belt module. not draining. mmm hink thatl be pump or a blockage. oven naw heat element. over heat state? fridge naw go compreeser. or state. got a pac 1000 pat tester tho 😆 any way. when put on test ie hold button down for 60secs.p1 an p4 flash twice. at end same as orignal board does

Errrrr?….can you put it another way please my enigma machine (ooops sorry – megger) isn’t getting a reading on that right now. 🙂

Would you like to take up my earlier offer though I wonder?

lee8 wrote:Isn`t it now part of the law that all appliances are safety checked including insulation test, Earth loop impedance and earth continuity.

Sadly I have to report that no such legislation applies, the law doesn’t carry a megger on the van either. :rolls:

Well Maybe it should be Law!

Re: meggers

The short answer to that is yes, if you work on an appliance & someone then gets injured or killed using the item you will be liable to prosecution.
The only way to cover yourself is to test all repairs for Electrical safety on completion & keep a written record of the test results, the easiest way to do this is write the results on your jobsheet & the customer invoice. I allways tag the appliance as well to show that it has passed the safety tests, personally I would be lost without my insulation tester & don’t understand how people can work without 1. 😯
As for all the big boys doing the tests, Simple: They know as well as we do what happens when you Electrocute a customer.

Andy

Re: meggers

Hi Alex: Until the Government decide to pull their finger out & make safety testing compulsory it’s just going to get worse, it’s the same in the Commercial sector as well. The Majority of “Engineers” don’t have a Megger or know how to use 1 & don’t even do the most basic Earth continuity test with a Multimeter, as for Loop testing I don’t know what it’s like in your area but I have only come across 1 other appliance engineer who has 1 in my area.

Andy