WMA 33

[lee_yeovil]

Hi fellas,

First of all thanks for the invite to join UKW – a font of knowledge from what I’ve read; I look forward to contributing in the future.

In the meantime, I’ve been out to a WMA 33 today with an initial report from the customer that the machine isn’t spinning properly.

On inspection and test on spin the pump activates followed shortly by the motor turning at a speed faster than distribute for about 3 – 4 seconds – the pump remains on. Then the motor once again kicks in pretty fast but this time the machine just cuts out after a few seconds i.e. pump and motor both stop altogether.

I would apprectiate any ideas/comments on this one.

[Tubs]

Re: WMA 33

Hi Lee

Check tacho coil

Steve

[bazza500]

Re: WMA 33

Hi Lee,
If the tacho coil seems ok check the wiring hasn`t chaffed against the lower concrete weight.

[lee_yeovil]

Re: WMA 33

Thanks for the suggestions. I should have listed what I’ve so far checked in my original post, which is:

Motor: Tacho Coil (continuity tested ok), brushes (no wear), insulation (fine)

I’ve also visually checked for any chaffing of the wiring loom and all appears to be ok – will obviously check again.

And because I’d got one handy, I’ve swapped the main board around, which gives the same fault!

Unfortunately I don’t have an FHP motor in stock in order to swap/check it.

Any more suggestions would be very welcome!

[iadom]

Re: WMA 33

Hi Lee, have you tried to find the last error detected code. Look in the ‘Error codes’ thread on page 3. Not foolproof but does work most of the time.

I can also give full Service Test programme details if you need them.

I have seen the occasional loose tacho magnet cause this fault on the Ceset motors.

[mbdas]

Re: WMA 33

Hi lee
have you checked the plug into the motor I’ve had a few of these brake inside they look ok even if you pull them hard 🙂

[lee_yeovil]

Re: WMA 33

Many thanks for your replys – will check them out.

Iadom,

I would be most grateful for a copy of the full service test programme, I’ll send you an email.

Many thanks.

[iadom]

Re: WMA 33

Will do.

mbdas has a good point, the wiring loom from motor to module is available as a separate part. No:1603396, only a couple of pounds.

[andy2]

Re: WMA 33

The easiest way to check these is to slip the motor plug of the module and disregarding the three wires that go to the interlock (the end that has a coloured wire black or red usually) you should find continuity through every pin on the edge connector.

This checks out the motor and wiring harness in one go and is the easiest to get at. If everything checks out OK then your problem is on the module (assuming no intermittant fault and the tacho magnet is in place)).

Are you sure the module that you tried in is OK, because its usually a s/c motor triac.

Some of these modules have two triacs one for the main motor circuit and the other for motors that have a split field coil.

I had two the other week – same fault – triac

Most 16A triacs will work OK even though the gate trigger voltage might differ a bit usually I stick a BT139 in.

Andy 🙂

[Author]

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