burning motors

[beakerman64]

hi all i am new here and have read some pretty good info here,i have a question about motors if you can help me? i am using national combos and have fried about 6 of them in the past 4 months or so, and i have checked the gear box's they seem fine checked caps and all is fine, any other ideas on what might be the problem? thanks for all the great ideas.

[8270king]

Re: burning motors

Have they all been on the same gearbox? Check the oil level and mechanical resistance on the gearboxes you are losing stators on.

king

[Lampie]

Re: burning motors

The first thing to worry about with burning motors is the thermal overload or clixon in the stator. A lot of them don't work the way they should work(they don't trip at all or they trip too late).
A better idea is to remove the clixon and put a 4 Amp.(with 220 volts-with 110 volts you need 8 Amp.)automatic overload on the hotline outside your motor, using the ts-strip(ts-6,ts-7,ts-19)in the channel. I bought them from Siemens and Hager, about $15 a piece.
The other advantage is that they also function as a manual safety switch for al your motors, and you can put them somewhere on the front-end of your machine(i have six in a row for two machines in a box near the A&mc box). So you allmost never have to remove your motor plugs for safety or other purposes, wich is better for the motor plugs and you can easily contol your BE-motor from the front end side. All this with your pitlights on, so no problems with working in the dark.

The next thing you have to look at is the reason why the overload is tripping(or should ofcours).
There are a lot of reasons but I will give you the " most wanted" list to give you a start....
Bad centrifugal switch, bad capicitors, bad wirers or connections, bad motorrelay or bad relay contacts, bad gearbox, something mechanicly wrong with your machine beside your gearbox, bad motor plugs, bad or burned contacts on the C-1 plug, bad contactors on the ts-strip in the channel, bad switches in the BE-contol box,etc, etc, etc,.....
And ofcourse don't burn two or more stators/motors on one gearbox(this sounds stupid but I've seen someone doing it),but first check a stator/motor on a machine without problems.

Good Luck

Lampie

[This message has been edited by lampie (edited 01-13-2001).]