Siemens SIWAMAT 5030 no turning

[fleabo]

E-NR WM50301GB/01
FD 7901 00020

Sequence of events reported by wife:

Washing machine was making unusual sounds on spin this morning.
Later, noticed kitchen circuit breaker had tripped out.
Reset breaker.
Not sure if washing machine has turned or spun since then but drained and completed the cycle.

The machine fills and drains OK.

I have looked around inside for signs of obvious failure but nothing apparent. Resistance between brushes varies between 2 and 3 ohms. Brush length left 8mm on one side (have not checked the other). Machine is 8 years old, services a family of 5, and brushes never replaced. I am convincing myself I need to change the brushes and that may be the source of the problem. (Reported noise on spin cycle could point to this too).

BUT, are there other checks I can make on the machine to support the problem is the brushes? I am little concerned that the RCCB was tripped – this could point to a possible overcurrent which I would not associate with worn brushes.

Any pointers are more than welcome.

New brushes: The motor has the following markings:

151 60001.01 (The ‘6’ maybe a ‘0’)
4/99 53/II
3047801AB5

The porcelain brush holder: 031 60012

Thanks,

Fleabo

[Martin]

Re: Siemens SIWAMAT 5030 no turning

fleabo wrote:BUT, are there other checks I can make on the machine to support the problem is the brushes?

The brushes will certainly be the problem and replacements can be found here

But I would dismantle and clean the motor with WD40. And on reassembling it test its insulation resistance (500 volt insulation test meter and all that good stuff!) to ensure the armature wasn’t duff?

If you would like a local engineer to take care of all that for you? Then do please click on the link below. 😉

[fleabo]

Re: Siemens SIWAMAT 5030 no turning

Thanks. I ahve changed the brushes on the motor. Removed old brushes and inserted new ones making sure they were the right way around.

Cleaned up the commutator a little with meths-soaked cotton buds. Refitted and reconnected the motor.

Drum and motor still do not rotate. The RCCB has not tripped again.

The resistance measured between brushes is now dropped to 1.9 ohms. Are there internal electronics in the motor and is it possible to check that the main control board is applying volts to the motor?

Are there other checks I can perform to try and isolate the problem?

Thanks,

Fleabo

[Penguin45]

Re: Siemens SIWAMAT 5030 no turning

Remove plug and lid. The electronic board on the cross bar runs the motor. If you ease it off the clips and turn it over, you will probably find a couple of tracks blown off. 9 out of 10, soldering these back together will solve the problem. If, when repaired, it kicks straight into spin, there will be damge to the electronics and you will have to consider replacing the board.

Penguin45.

[fleabo]

Re: Siemens SIWAMAT 5030 no turning

Many thanks for the help. I was surfing for a new machine…

Have removed motor and dismantled: lid, rotor, and stator. On my motor the plastic circuit board is screwed onto the lid. I have removed.

The circuit tracks are embedded into the plastic board. It is not obvious from visual inspection whether tracks have fused.

I have tested continuity. The connections to the field windings on the stator are intact. The two connections to the (what I will describe here as a) sensor are intact. The connection to one of the brushes is intact. The connection to the other brush from the main connector goes through a device. The device is a small can about 12mmx8mm by 3mm high. On a resitance test it appears open circuit. The markings on the device are “15 AM 253A” and “10V8S”. I am not sure what this device is. It appears to only have two terminals.

The field winding resitance seems OK (not particularly high). The armature resistance is OK.

What is the device, has it failed and, if so, is their a replacement ?

How can I check the main circuit board of the machine?

Thanks,

Fleabo

[Penguin45]

Re: Siemens SIWAMAT 5030 no turning

I take it your 1.9 ohms was at the tags and not the terminal block? You are describing a Cut-Out failure. Correct repair is a new brush holder (the white plastic plate), but I do have a suspicion that this is now only supplied as complete motor end-frame.

Penguin45.

[fleabo]

Re: Siemens SIWAMAT 5030 no turning

Thanks. Dismantled motor and found what I guess is a thermal cut out that has gone open circuit. I have temporarily fixed this component.

Motor now runs but with considerable amount of sparking when drum rotates (on wash) and the motor is rotating in one particular direction. No sparking in other direction or on spin (probably as the rotation direction is is the same). Has completed two short washing cycles – unloaded and loaded.

I removed motor again to inspect and check that I have inserted the brushes and rebuilt motor OK. I notice what looks like discharge marks between the brush holder and metal shield over tachograph close to the point where the brush contacts commutator segments. Local RCCB does not trip though.

I wonder if the brushes are just “bedding in” to a worn commutator, or that the motor has now worn to the point of replacement rather than repair.

I think I now have a choice between a £180 motor for a 8 year old machine or a new £280 Bosch.

Any comments gratefully received – it would be a shame to ditch her, a nice piece of kit and remarkably easy to work on. Mainly metal too!

Thanks,

Fleabo

[fleabo]

Re: Siemens SIWAMAT 5030 no turning

Sourced a new TCO and have installed. Brushes now worn in and machine running well.

May get another year or two out of her yet!

Thank you UK Whitegoods! 😀

[Galby]

Re: Siemens SIWAMAT 5030 no turning

Siemens WM50301GB

Hi guys,
I have the same problem, brushes went to far down and blew MCB, replaced brushes but still didnt work, then found this thread- perfect, but was wondering where to purchase the thermal cut out fuse?(15AM253A- 23FOSA) it is located on the plastic plate at the end frame (PBT GF 30{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} 615.60001)
Any help would be appreciated or wife will get me to but a new machine!

Thanks
Galby

[Penguin45]

Re: Siemens SIWAMAT 5030 no turning

It isn’t a spare part in it’s own right. Boschs’ parts listing shows a motor with the carbon brushes in separate plastic holders, suggesting that it is an FHP motor, rather than a Bosch one. Only the brushes are shown as a spare. The usual solution is THIS LITTLE CHAP. You need a pair of snippers, a tyrap, a soldering iron and some patience. I can’t honestly tell you whether or not it will fit your motor.

Penguin45.

[Author]

Posts