DOL Switch Wiring

[Clive]

Hi Guys

Can anyone out there help me, I’ve got a DOL Starter Switch which I want to use for my woodwork machine, but at the moment it keeps tripping out.

The switch is for a 3 phase supply 240 volt, I believe they can be wired for a single phase supply which is what I’m trying to do.

The woodwork machine is purely a hobbyist one, the plate on the motor says its 1.5HP, 1.1KW, 240V, 6.9A.

The switch I’m using is Moeller MSE-M240V Made in Germany.

As already said the switch keeps tripping out, ie if the motor is connected to the switch with no load on the motor it runs quite happily but soon as the motor is attached to a piece of machinery such as a table saw the switch trips out, if I wait about 15 seconds I can then switch the saw back on, only for it to trip again.

I’ve been told there is a connection missing on the switch which I need to make as it’s a
3 phase switch and it could be out of balance causing nuisance switching.

From my diagram could someone tell me where I need to connect the wire?

 

[Clive]

ipf
There’s nothing like cocking something up, my apologies for getting the diagram wrong please see the revised Wiring Diagram 7 the four emergency stop buttons are all normally closed and if one of them is pressed it has to be locked back on and the machine can only be restarted by pressing the DOL Starter button.

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Davesparks

David Prosser is correct there is such an animal as single phase DOL Starters, in fact with the help of you guys in may very well turn out to be a case of the 6A overload on the one I’ve got just won’t hack it.

I’m assuming the 6.9 amps rating on the motor plate is the maximum as it does not say.

I suppose I could buy a clamp on ammeter and check the current draw.
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Guys

Will you all please take a look at the revised Wiring Diagram 7, sorry for getting the original one wrong.

The e/stops are all N/C, plus there is a link between terminals 13 NO and A1.

Can someone confirm if Wiring Diagram 7 is correct for also balancing the phases??
If it is still wrong I'd really appreciate it if someone could modify Wiring Diagram 7 and post it on here.

If it is, I will change how the starter is wired at present and see if it still trips out, if it does then I will have to buy another starter with a bigger overload current setting.

Iv'e also included a few pics of the starter.

 

[Julie.]

ipf
There’s nothing like cocking something up, my apologies for getting the diagram wrong please see the revised Wiring Diagram 7 the four emergency stop buttons are all normally closed and if one of them is pressed it has to be locked back on and the machine can only be restarted by pressing the DOL Starter button.View attachment 56794
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Davesparks

David Prosser is correct there is such an animal as single phase DOL Starters, in fact with the help of you guys in may very well turn out to be a case of the 6A overload on the one I’ve got just won’t hack it.

I’m assuming the 6.9 amps rating on the motor plate is the maximum as it does not say.

I suppose I could buy a clamp on ammeter and check the current draw.
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Guys

Will you all please take a look at the revised Wiring Diagram 7, sorry for getting the original one wrong.

The e/stops are all N/C, plus there is a link between terminals 13 NO and A1.

Can someone confirm if Wiring Diagram 7 is correct for also balancing the phases??
If it is still wrong I'd really appreciate it if someone could modify Wiring Diagram 7 and post it on here.

If it is, I will change how the starter is wired at present and see if it still trips out, if it does then I will have to buy another starter with a bigger overload current setting.

Iv'e also included a few pics of the starter.



View attachment 56796

View attachment 56797

View attachment 56798

View attachment 56799

View attachment 56800

View attachment 56801

It looks OK to me.

The point is to make sure all the safety interlocks/switches work physically.

As for the overload - motor rating, the current draw on a motor is very dependent upon the load applied. So if you are running the machine for long periods with no load at all the current is likely much less than 1.5A, under moderate load say 5A, and so on - the point being is that if you do run it at the maximum it can safely take then you would need a new overload to do 6.9A but, if it's not running at this for any length of time a lower rating (6A) would suffice.

The only issue would be that if it's started and stopped frequently and run close to maximum, then the overload could trip.

Given that you have everything in place other than the L2-T1 link, I would just add it and make sure everything is OK - it's likely to be absolutely fine.

If you do need to change the overload, I would just change the overload, not the full unit - it's a standard part.

The single phase DOL starters are exactly the same as the one you have - they just already have a link L2-T1!

 

[David Prosser]

kKlockner Moeller are now under the Eaton Brand.

014708 ZE-9 | Eaton ZE Overload Relay 1NO + 1NC, 6 → 9 A F.L.C, 9 A Contact Rating, 6 W, 600 V ac, SP | RS

uk.rs-online.com

this should give you a direct replacement.

 

[Clive]

Julie

iv'e just got around to trying the machine again,, its fine when motor is running but as soon as I push a piece of wood through saw it stops, so it does look as though the overload won't hack it.
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David Prosser
Thanks for the

 

[Julie.]

Julie

iv'e just got around to trying the machine again,, its fine when motor is running but as soon as I push a piece of wood through saw it stops, so it does look as though the overload won't hack it.
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David Prosser
Thanks for the

Stops as in stalls the motor, or trips the Overload?

If it's the motor stalling , that won't be the overload - it would be something else.

If it is just tripping the overload under load - then a new one is needed!

 

[Clive]

David Prosser

Thanks for the overload link but I think I'm going to buy a complete new switch maybe this one.

The spec is:
Used primarily for motor switching.

Three different ratings to suit single phase motor powers from 750W - 3.75kW

Units for 750W, 2.25kW or 3.75kW motors.

Adjustable overload protection:

340192 - 6A to 8A

340193 - 14A to 17A

340194 - 17A to 21A
Can be used with additional foot switches, interlocking micro switches or thermal overloads.

175mm (6⁷⁄₈ʺ) high x 100mm (4ʺ) wide x 130mm (51⁄₈ʺ) deep

IP54 rated against dust and moisture ingress.

Only thing I'm not sure about is my motor is 1.5hp 6.9amp, the 340192 does between 6A to 8A but is that only good for 750watts.
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David Prosser

Iv'e just taken another look at the Axminster Tools Site, they do one which is 1500watt but I think the overload is 14A to 17A which will be too high, so I'm still looking.
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Guys
Iv'e just seen this Electric Motor DOL Starter 240V or 415V pre wired contactor it comes with various ratings 5.5 to 8amp or 6 to 10amp price is £37.99 ebay.

Question the plate on my motor says 6.9amp but it does not say if thats the maximum so which of the two ratings above do you think would be the best to go for???