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  1. S

    3 phase delta connected motor advice

    What could be done if C20 MCB trips due to frequent reversing caused by stalled shaft on a Vecoplan VAZ 100/80 1994. Eaton online selection tool suggests PKZM0-25 motor protection circuit breaker with a 150 Amp tripping current. C20 MCB has the same tripping current (want to keep it low enough...
  2. S

    Ceramic bottle fuse holder, sudden short to DIN rail (earth)

    Hello... Anyone had any extended experience with ceramic bottle fuse holders. Shortly after turning on isolator switch there was phase to ground short between one of fuse terminal metallic parts and DIN rail (35A gL/gG fuses have been taken out to test the correct working order of contactors)...
  3. S

    Contactor response time

    Thanks for answers everybody. Turns out one contactor was pressing too much against the time delay relay. One link on the terminal block was bad as well.
  4. S

    Contactor response time

    Another thing is there is missing NO K33.1 contact in series between K33 and K33.1 coils (wiring diagram incorporates three different models in one).
  5. S

    Contactor response time

    Received the wiring diagram with user manual not long ago. Seems like latching on automatic mode circuit is working. I think there might be some unrelated or unobvious cause, something is still in a semi-broken state. Not sure if it's advisable to show the wiring diagram according to...
  6. S

    Contactor response time

    Unfortunately it was too good to be true, now after a while it turns itself off again when the automatic cycle button is pushed (yellow pilot light briefly comes on then goes off). We have ordered service manual, maybe it will help to some degree. When one of time delay relays are being tapped...
  7. S

    Contactor response time

    No it didn't as I was busy with other things in the meantime. I was not allowed to work on it everyday anyway.
  8. S

    Contactor response time

    Thanks for answers. Found one loose screw on timer relay, now it works.
  9. S

    Motor starter recommendations for flywheel press

    Are they slightly over-sized? I think 10 secs is enough to reduce initial mechanical stresses.
  10. S

    Motor starter recommendations for flywheel press

    Thanks for answers. Attached some DIN rail on existing enclosure and used new star delta starter since the star delta starter kit with a 9 Amp overload protection relay was already purchased in a hurry. According to starter enclosure nameplate it was only a 7.5 kW (10 hp) 15.9 FLA motor (due to...
  11. S

    Motor starter recommendations for flywheel press

    Since I can't find the wiring diagram for manual star delta starter I had to reverse engineered it to some point (manual changeover lever auxiliary contacts in series with contactor NO latching contacts). The contactor is old type with integrated overload protection, the construction is quite...
  12. S

    Motor starter recommendations for flywheel press

    I have been told the press will get scrapped soon anyway. VSD is 4 times more expensive than soft start.
  13. S

    Motor starter recommendations for flywheel press

    Contactor coil on manual star delta starter has burned out due to possible humidity and old age. The easiest solution was to find a replacement coil, only thing is it's quite ancient so finding a similar size coil is nearly impossible. Since it's a fairly big flywheel press with a 11 kW motor...
  14. S

    Contactor response time

    True, the more you learn the less you understand and if you manage to get something done once it doesn't mean you will be able to do it every time. The hardest thing is to always start with the right mindset.
  15. S

    Contactor response time

    I think it will be quite hard to reverse engineer the circuit without any mistakes in this case since there are at least 15 contactors, 8 time delay relays and 7 push-buttons with bunch of unmarked wires squeezed in to the wiring duct. Agree, sharpies and white inslulation tape is better than...
  16. S

    Contactor response time

    It might be the case since it shuts itself down as well (when switching to automatic mode) in case of a disconnected work-piece sensor switch, it's connected in series with that particular contactor coil. Now we are playing a guessing game. There is no other way but to fiddle around with it for...
  17. S

    Contactor response time

    I have the same thoughts. Germans usually design everything properly. I had no other choice but to buy some cheaper/smaller contactor. The other option is to repair the old one, only thing is usually it's not worth the hassle.
  18. S

    Contactor response time

    Right okay, thanks for answer. Problem might persist due to heightened contact resistance on other contactors (when measured with multimeter), or there might be messed up wires due to lack of labelling. Will have to look for Behringer HBP 260A 1992 band saw electrical wiring diagram. This one...
  19. S

    Contactor response time

    Are the contactor response times significantly different between for each manufacturer? For certain types of relay logic it's quite critical (drop-out and pick-up time, NO/NC sequence). Usually NC contacts are disconnected first before NO contacts are connected. Had to replace 4NO 4NC Siemens...
  20. S

    Volumetric doser controller without opto-isolator on dry contact input

    Why was that site unsafe?

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