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Electric motor test

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Lee Rogers10/06/2022 11:43:20
176 forum posts

I have a Bosch pro table saw that won't run. It has all the soft start and overload electronics and a no volt switch that one expects to find on a modern motor.

The question is , if I bypass the switch and all the electronics and power it up directly should it run ? Will I damage it ?

Dave Halford10/06/2022 12:08:49
2102 forum posts
23 photos

Better to put a light bulb across the motor feed and see if it lights up when you switch on or buy a cheap multimeter.

Poke and hope with mains can be fun.

Mike Poole10/06/2022 12:32:39
3383 forum posts
77 photos

If it has a brushed motor as some do then check the brushes are not worn and are free in the holder and contact the commutator. Bypassing the soft start and control gear should not be a problem but if you are not confident with mains power then seek assistance. The fuse may fail with the inrush current but is likely to survive. The startup will be quite brutal compared to the soft start so be prepared.


Emgee10/06/2022 14:25:14
2446 forum posts
291 photos


Check on the motor plate to confirm operating voltage and if AC or DC supply.
Makers spec gives power output as 1.8kW so a direct connection will result in a fair current surge on start-up if connected direct.


Lee Rogers10/06/2022 18:12:38
176 forum posts

Many thanks to all . Now to get the pixies flashing and smoking.

Jon Lawes10/06/2022 20:02:22
1007 forum posts

Take the utmost care! We need all the members we can get!

noel shelley10/06/2022 20:23:06
1451 forum posts
23 photos

Very much depends on the type of motor, brush or induction and your knowledge. If it's induction then do not by pass the condensers, and fit some sort of switch. Good luck. Noel.

duncan webster11/06/2022 00:45:04
4128 forum posts
66 photos

I've never come across a soft start single phase squirrel cage motor. Connecting direct to the mains without a lot more information sounds risky to me

Michael Gilligan11/06/2022 05:49:58
20289 forum posts
1064 photos

Is this the machine ?




Edit: __ If so, then it evidently has a brushed motor:


Edited By Michael Gilligan on 11/06/2022 05:59:33

Edited By Michael Gilligan on 11/06/2022 06:13:08

Michael Gilligan11/06/2022 06:22:58
20289 forum posts
1064 photos


I didn’t understand a word he was saying … but this might be of interest:



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