DEAD SCHEPPACHE TKU 4000 MOTOR

[r1chard06]

hi all newbie here in need of help i was using my tku 4000 the other day i switched off for a min then switched back on and nothing no sighns of life at all
so i spoke to allan at nma they said probably bad cap so sent me a new one free of charge came nxt day still same so they sent me a new nvr switch again free arived next day was an extra wire on that so they sent me another new one free it came fitted it and still same its nowt to do with safety switch as i disabled it to test it wen i push on button i get a little minute hum from power switch untill i let go off switch so power is at switch and im stuck pulling me hair owt as wot to do next i have tried to dismantle but wont come apart plz plz plz help

motor ratings are
scheppache
230/240v
p1 2.20kw
p2 1.50kw
2800 rpm
50 hz
400v

 

[Phil Pascoe]

Are you sure the hum is the switch not the motor - mine (different saw) hums if for some reason the blade won't go around. Try taking the blade off and see whether the motor runs then.

 

[r1chard06]

no i have removed it from saw and taken blade off and the hum was from switch no sighns of live at all from motor it has a fuse inside wich looks intack dont no were to start

 

[ProShop]

Have you checked the capacitor, seems like the motor wants to start but it missing the boost from the capacitor.....??

 

[xy mosian]

If the fuse is a galss tube with a visible wire. Please take it out and check it with a meter, if possible, and give it a very close inspection. Sometimes the break can be difficult to spot.
xy

 

[Togalosh]

I take it you have checked the plug is all ok inside(??) & that other machines work on that socket too.

Some motors have internal over-heat switches as well as over amperage switches.. and most posts on here are to do with machines being too dusty & overheating & might work again once cooled down.. some switches trip at too lower a temperature.

Try moving the motor's shaft either at the back if it has a slotted end or on the load end to see if it moves freely. If not then find why.

If you think it's a power issue you'll need a multimeter to fault find or else you'll just be guessing. Volt sticks are too general.. testing if voltage is present isn't enough - you need to know how much voltage & if you have a neutral.

http://www.argos.co.uk/static/Product/p ... 015603.htm

On the Ohms setting you can test continuity to check earth bonding, fuses or switches (with power off !) by putting either probe on either side of fuse or switch & listen for beep .. AND for Neutral but with 1 probe to earth & listen for a different sound.. more of a brrrr (as just cos you have live to a part doesn't mean it'll work- you need neutral too.. in 1 phase situations at least).. then you can test for AC or DC voltage on those specific but different settings with 1 probe to terminal/wire & other to earth or neutral. Check that you are getting 230v across live & neutral where the cable enters the machine to check that the cable is not broken.

Basic fault finding = You need to trace where the power is or is not. If there is live & neutral (at correct rating) to the motor & motor is not physically impeded & the capacitor is new & the correct uF but does not run then it is faulty.. but if there's no power or not enough of it then where does it stop?.. that's where the problem is. You could wire the motor up to a 3 pin plug & see if it runs - if it does then it's obviously something else.

As ever - if you are not confident that you can do these checks safely then stay clear. Check you have good earth bonding 1st if you fancy a go.. look for 2 Ohms or less & the beep when testing between bodywork & a definite earth point (on earth terminal or nearby water pipe etc)..& just don't touch wires with you hands unless the machine is definitely unplugged.

 

[r1chard06]

hi i changed cap still same changed wire and glass fuse still same i have a multimeter

 

[r1chard06]

just a thought it cant be anything to do with it being removed from the saw could it like i mean not earthed to the saw

 

[r1chard06]

i have a a multimeter its a sinometer ms8230b and in all honesty i havent a clue how to use it setting ect any one help me out

 

[r1chard06]

ive just rememberd dont no if it helps diagnose but on day it died i kept getting little electric shocks from steal table wen i checked earth was loose on extension but woudnt work after that tried in mains ect to no avail thiss may be a stupid question but motor is sat on my table in house will it need earthing out to something in order to work ie wen its in saw it earths on frame as i changed nvr n capacitor wen its sat on table if u get my drift

 

[CHJ]

On the basis of the comments so far and lack of knowledge of how to use a multimeter I would strongly advise that you get a qualified person to look at the motor and the machine wiring for you.
Mains power is one of those things that very often does not allow you to make a second mistake.

 

[Togalosh]

..the tingling is probably static that's not discharging.. you are running the motor on a bench & you've not thought to earth it too - that's a worry. I'd take CHJ's advise a leave it alone.

 

[r1chard06]

well i took it to a motor shop and they said needed new bearings and a rewind asked how much as i can get a replacment for £149 they said be less than that so i had it repaired then they tell me its £145 + vat

 

[Shrubby]

It's worth making friends with motor rewind people - one day they might really get you out of a tight spot. Many new motors are not great quality and older machines often use unusual designs which can't readily be substituted
Matt