Hitachi M12 blowing fuses - Router Forums
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post #1 of 26 (permalink) Old 10-14-2016, 01:31 PM Thread Starter
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Default Hitachi M12 blowing fuses

Hi I have a Hitachi M12 V which developed a speed control problem recently. I have bypassed the unit but now each time I start the router it is blowing the plug top fuse. Here in Ireland we use 220V AC and the standard plug fuse is 13A. I have read that the M12 V is rated 15Amps, When the speed control unit was working this did not happen. Is it the case that the speed control unit employs a current regulator on start up if so how can I prevent the fuse from blowing. The max fuse top fuse available is 13A. I would appreciate any advice
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post #2 of 26 (permalink) Old 10-14-2016, 02:15 PM
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?! ... 13 Amps at 220V? Seriously?
That can't be correct(?).
Watts to amps (A) conversion calculator
Using 1500W at 220V with a power factor of .85, I got 8.02 A
Something is very wrong.
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post #3 of 26 (permalink) Old 10-14-2016, 02:24 PM
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Dan, that model is rated at 1850 watts.

UK standard household socket is 220 volt and 13 amp fuse is the largest that can be fitted to the plug.

But that will take a 3 Kw kettle without blowing (rough calculation of 4 amps per kw), so it sounds like the by pass wiring is not correct.
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post #4 of 26 (permalink) Old 10-14-2016, 02:25 PM Thread Starter
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Hi Danin Van
I measured the resistance across the motor winding's and I am only reading 1.2 Ohms, I would have thought it should be greater. When i start the router the motor kicks for an instant and blows the fuse. Also there is a noise supressor across the switch could i risk removing this try powering it up. Many thanks for you input
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post #5 of 26 (permalink) Old 10-14-2016, 02:30 PM Thread Starter
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Hi Sunnybob
I just cut the two gray wires on the speed control unit and connected them together, leaving the yellow wire disconnected and taped up No other modifications were made. I assume that was correct. many thanks for your advice
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post #6 of 26 (permalink) Old 10-14-2016, 02:34 PM
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Irish; there's a lot of guys here way more competent than me to answer that! :0
I'm just shocked that you are able to blow a 13 A fuse with a handheld router (220V).
Have you taken it apart and looked for evidence of shorting or overloading, ie heat marks?
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post #7 of 26 (permalink) Old 10-14-2016, 02:50 PM Thread Starter
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Hi Danin Van
I have just checked interior with a torch. There doesn't appear to be and any burn marks or smell of burning which you would expect if the winding's had shorted. Perhaps its time to take it apart or consign it to the bin.
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post #8 of 26 (permalink) Old 10-14-2016, 02:52 PM
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Bosch.
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post #9 of 26 (permalink) Old 10-14-2016, 02:52 PM
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Using an Ohms law VIR triangle formula, at 220 volts and 1.2 ohms, youre drawing 183.3 amps.

Oh yes, that will blow a 13 amp fuse pretty damn quick.

Are you confident with the test meter? Is that really 1.2 ohms? Have you adjusted the settings to a lower range?

If you really are getting 1.2 ohms, then the wiring is basically a dead short. Further investigation is needed.
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post #10 of 26 (permalink) Old 10-14-2016, 02:56 PM
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