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Model Forum / General / Models / December 2006reversing switch
*someone* must supply these without involving me in a 40-mile or more journey. MEM make 'em among others. looking for an enclosed changeover switch, rated at about 30A 250VAC, must be double pole and ideally with an "off" in the middle. I can find various such on different websites, but none that appear to want to sell me one direct. anyone got any idea? or, anyone living adjacent to an industrial switchgear supplier can get me one and post it, for a suitable contribution to the beer fund?  SignatureAustin Shackles. www.ddol-las.net my opinions are just that "Where they make a desert they call it peace" Tacitus (c.55 - c.117) Agricola, 30 > *someone* must supply these without involving me in a 40-mile or more > journey. [quoted text clipped - 7 lines] > > anyone got any idea? Don`t know what you want to change over to.Do you want to switch a single phase supply two ways with an off position or do you want to change polarity of a single phase supply possibly for reversing the start windings of a single phase motor. If it`s one of the above and you want to do it manually look at Kraus & Naimer. If it`s neither of the above and you are actually looking for a reversing contactor set with coils to operate the contacts then be prepared to spend money.Or look on Ebay for a reversing contactor pair with 240 volt coils.They are usually cheap enough (on ebay) but you would probably have to supply an enclosure. Mark. >> *someone* must supply these without involving me in a 40-mile or more >> journey. [quoted text clipped - 14 lines] >If it`s one of the above and you want to do it manually look at Kraus & >Naimer. allow running a single phase motor forwards or backwards. The current motor is the kind that you can reverse by swapping links around on the terminal block and it's wired through a pair of SPDT switches which are pretending to be a DPDT so it can be reversed by switching it rather than crawling around behind the machine. However, that motor is due for replacement soon with a more convincingly powerful one and the current switches won't have enough capacity for the bigger motor. However, the same general principle will, I assume, work on the motor which is to replace it which will hopefully be more powerful and also have better starting torque. The existing motor is just plain wrong for the machine, not enough starting torque and not enough power. >If it`s neither of the above and you are actually looking for a >reversing contactor set with coils to operate the contacts then be >prepared to spend money.Or look on Ebay for a reversing contactor pair >with 240 volt coils.They are usually cheap enough (on ebay) but you >would probably have to supply an enclosure. >Mark. SignatureAustin Shackles. www.ddol-las.net my opinions are just that If all be true that I do think, There are five reasons we should drink; Good wine, a friend, or being dry, Or lest we should be by and by; Or any other reason why. - Henry Aldrich (1647 - 1710) >allow running a single phase motor forwards or backwards. The current motor >is the kind that you can reverse by swapping links around on the terminal [quoted text clipped - 8 lines] >starting torque. The existing motor is just plain wrong for the machine, >not enough starting torque and not enough power. Sounds like a standard Moeller T-series would do the job. I'll look at the RS catalogue and see which ones they carry. Did I see any current/HP ratings? Peter -- Peter & Rita Forbes Email: diesel@easynet.co.uk Web: http://www.oldengine.org/members/diesel >>allow running a single phase motor forwards or backwards. The current motor >>is the kind that you can reverse by swapping links around on the terminal [quoted text clipped - 13 lines] > >Did I see any current/HP ratings? the replacement motor will not be more than 3HP, so running load should be around 10A, but starting current of course is higher. I reckon a 25A or 32A switch will cover it. The contactor has an adjustable overload between 9A and 14A. If I go for a 2HP motor (which I might, with a high-start-torque one it should be sufficient) then that will cope I reckon. It might not handle starting load on a 3HP one. If you have an account at RS and can hunt a suitable switch (they seem to tend to be marked I-O-II or such) then I'll be suitably grateful SignatureAustin Shackles. www.ddol-las.net my opinions are just that Blue: The sky is blue for a reason. Blue light is a source of strength and harmony in the cosmos. Create a blue light in your life by telephoning the police from the Little Book of Complete B***ocks by Alistair Beaton. > allow running a single phase motor forwards or backwards. The current motor > is the kind that you can reverse by swapping links around on the terminal [quoted text clipped - 3 lines] > more convincingly powerful one and the current switches won't have enough > capacity for the bigger motor. It might be prudent to fit a contactor and overload for protection and wire the reversing switch after the contactor. Mark. >> allow running a single phase motor forwards or backwards. The current motor >> is the kind that you can reverse by swapping links around on the terminal [quoted text clipped - 6 lines] >It might be prudent to fit a contactor and overload for protection and >wire the reversing switch after the contactor. I've got the contactor to start the motor, and yes it has overload protection. Whether it'll run the bigger motor I plan on getting time will tell :-) and yes, the current setup runs from the contactor to the reversing switches and thence to the motor. SignatureAustin Shackles. www.ddol-las.net my opinions are just that Blue: The sky is blue for a reason. Blue light is a source of strength and harmony in the cosmos. Create a blue light in your life by telephoning the police from the Little Book of Complete B***ocks by Alistair Beaton. |
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