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ELNA SZ 120/125 Bench Grinder: Hums, Turns Dial, Stops - Capacitor & Winding Issues, 230V, 4uF

zlotowinfo 9864 13
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  • #1 16479744
    zlotowinfo
    Level 16  
    When turned on: it hums, gently turns the dial in the right direction and stops.
    After spinning the dial and turning it on: it stops.
    At 230v voltage input: 27ohm
    On the leads to the capacitor 57ohm (capacitor disconnected)
    The capacitor is functional, as on its housing, is 4uF

    Insights after reading similar threads:
    If I understood the tips on the forum correctly, it is rather winding.
    Someone wrote that if a capacitor fell, after turning it off, it would start.


    And what now:
    1. can it be fixed at all?
    2.Is it possible to disconnect the capacitor and start it manually until I find a replacement?
    3. measure the windings? will the capacitance of the capacitor not interfere?

    ELNA SZ 120/125 Bench Grinder: Hums, Turns Dial, Stops - Capacitor & Winding Issues, 230V, 4uF ELNA SZ 120/125 Bench Grinder: Hums, Turns Dial, Stops - Capacitor & Winding Issues, 230V, 4uF ELNA SZ 120/125 Bench Grinder: Hums, Turns Dial, Stops - Capacitor & Winding Issues, 230V, 4uF ELNA SZ 120/125 Bench Grinder: Hums, Turns Dial, Stops - Capacitor & Winding Issues, 230V, 4uF
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  • #2 16479802
    stanislaw1954
    Level 43  
    1-probably yes, you just need to find out what broke.
    2-but for the engine to start moving, you would have to rotate it a lot, which is not really how to do it.
    3- measure the continuity of the windings (working and auxiliary) by disconnecting the capacitor.
  • #3 16479937
    e2rd.o
    Level 21  
    zlotowinfo wrote:
    And what now:
    1. can it be fixed at all?


    link
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  • #4 16479939
    zlotowinfo
    Level 16  
    I don't know if I measure well ...
    At 230v voltage input: 27ohm
    On the leads to the capacitor 57ohm (capacitor disconnected)
  • #5 16480120
    stanislaw1954
    Level 43  
    The resistance of the windings only confirms that they are whole, not burnt, but who knows what values they should have.
  • #6 16480177
    ALIBABA I
    Level 33  
    zlotowinfo wrote:
    When turned on: it hums, gently turns the dial in the right direction and stops.
    After spinning the dial and turning it on: it stops.
    kol. and your bearings did not fall there sometimes?
  • #7 16480187
    zlotowinfo
    Level 16  
    1. e2rd.o is too smart for me, and it is probably not profitable to give it to someone
    2.stanislaw1954 also do not know how much they should have, one thing that is not interesting is the cracked insulation of the capacitor wire, but it does not affect the start-up

    Father visited some specialist and got information that it was some kind of wire inside and bearings
    the cost of the repair is to be PLN 50.
    Which in my opinion is a bit much and I think I'll order some efficient stimulant on the Allegro.
    A familiar electronics technician denies the problem with the bearings, no friction, the dial will rotate several times after turning it by hand.
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  • #8 16480199
    stanislaw1954
    Level 43  
    For PLN 50 it will definitely not "rewind" the windings, if it is a replacement of the capacitor.
  • #9 16480279
    zlotowinfo
    Level 16  
    I watched grinders on the Allegro for PLN 90 and I do not understand anything about it.
    Power 120W, 150W, 900W and 1700W.
    Up to such large spans of power? Are these parameters not correct? What to look for when buying?
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  • #10 16480525
    stanislaw1954
    Level 43  
    zlotowinfo wrote:
    What to look for when buying?
    Can you start with what do you need a grinder for? For sharpening a knife, broken screwdriver or for grinding coarse materials?
  • #11 16480688
    zlotowinfo
    Level 16  
    For the plot, scythe, knives and lawn mower knife.
  • #12 16480843
    e2rd.o
    Level 21  
    zlotowinfo wrote:
    I watched grinders on the Allegro for PLN 90 and I do not understand anything about it.
    Power 120W, 150W, 900W and 1700W.

    These powers will be real if you put the comma one place from the back.
    During the week I looked at CHAMPION Germany 1850W, I stopped behind the axle with my fingers, and the bearings are embedded in rubber seats and the rotor is blocked or rubbed against the stator.
  • #13 16481051
    zlotowinfo
    Level 16  
    My father was pissed that he could not do it and the new one was over PLN 100. He gave this guy what he would repair for PLN 50, he reassured his father that now they are doing this crap and better repair the old one (she has lived for 30 years).
  • #14 16481475
    nikusert
    Level 41  
    Hello .
    In single-phase motors, and especially in these grinders (I repaired, or rather reworked) the problem is with the bearing seats. Large clearance in the seats causes that the rotor is not positioned axially in relation to the stator. We assume that the windings and the capacitor are in working order. other bearings, wider than the current ones.As I remember correctly, 6201 bearings are used, and 62201 should be used. These bearings are a bit wider, but fit, but you need to roll the rotor a bit in the places where they rest against the rotor when we put them on the shaft. You know why, because the spacing of the bearings changes and the covers will not go down to the stator.
    Best regards.
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Topic summary

The ELNA SZ 120/125 bench grinder exhibits issues where it hums, turns the dial slightly, and then stops when powered on. The user has measured resistance values of 27 ohms at 230V input and 57 ohms on the capacitor leads when disconnected. Insights from the forum suggest potential winding problems, with some users indicating that a faulty capacitor could allow the motor to start after being turned off. Suggestions for troubleshooting include measuring the continuity of the windings and checking for bearing issues. A repair quote of PLN 50 was mentioned, with discussions on the feasibility of manual starting without the capacitor and the importance of bearing alignment. The user also inquired about purchasing a new grinder, expressing confusion over varying power ratings.
Summary generated by the language model.
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