Contactors and Relays (anti vibration ?)

[joel89]

I have a panel, on our large hammer forge which causes a hell of a lot of vibration hitting a 5tonne tube, anyway I am loosing my retain on 2 x small contactors LC1 18a which feed a servo and lubrication system and when the tube is nearly forged into a bottle neck shape it also causes a small 5a plug in relay feeding some oxy propane burner solenoids, basic dol start stop pb circuit I was wondering if there is anything on the market that will create enough electro magnetism to stop this happening?? or stronger springs on the relays and contactors??

any advice would be great cheers !

 

[Bobster]

Solid state relay. No moving parts.

 

[D Skelton]

Solid state relay. No moving parts.

Are there SSRs capable of handling 18A?

Is it not possible to mount the control panel further away but retaining controls in their current position?

 

[davesparks]

Are there SSRs capable of handling 18A?

Is it not possible to mount the control panel further away but retaining controls in their current position?

Yes, from memory I think Crydom make them with ratings upwards of 100A.

 

[Marvo]

You get cam operated relays and contactors, I used them many years ago on a project and they basically use a coil which in turn operates a cam that rotates 180 degrees to actuate the relay/contactor, they're completely impervious to impact. I've also see mechanically latching contactors which require both a control supplyto latch and a supply to unlatch. I'll have to dig around my office PC on Monday to get the details of the ones we used which I think were 30A or maybe 50A.

 

[tazz]

Andy your showing your age, with mechanical switching...lol...
Solid state, or diac switching quite common in plant control, and can handle some high loads, but they dont have a long life span. Last one I worked on was a feature swimming pool, were pumps were timed and controlled from diac`s

 

[D Skelton]

Yes, from memory I think Crydom make them with ratings upwards of 100A.

Must admit, I've not had much call to use SSRs. Only ones I've used have been for low current applications, and normally to switch larger mechanical relays.

 

[Marvo]

Also, depending on the severity of the problem you could try re orientating the contactor/relays that are giving problems, sometimes turning them through 90 degrees so the shock force is perpendicular to the relay or contactor armature might stop contact bounce under shock vibrations.

 

[Marvo]

Andy your showing your age, with mechanical switching...lol...

I don't know with you youngsters, just because it won't synchronize with your Facebook and Twitter account doesn't mean it not fit for purpose

 

[ian.settle1]

Are there SSRs capable of handling 18A?

Is it not possible to mount the control panel further away but retaining controls in their current position?

SSRs are used in UPS panels which can switch large loads

 

[tazz]

Late 90`s they have become more common, to protect sensitive electronics. The more we use microprocessors the more protection they need. Back emf from relays and a unstable voltage etc can do some expensive damage, so designs are turning more to ss

 

[D Skelton]

SSRs are used in UPS panels which can switch large loads

Very true, they are indeed!

 

[tazz]

Some of us old folks have to keep up with change.....lol

 

[joel89]

Cheers for the replies, I am using 18a contractors I am switching a 1.5kw at 415v motor and a 0.37kw at 415v motor. 110v ac control voltage, moving the panel is too much work 95mm feeder 110kw motor and loads of external outgoing cables !

 

[Bobster]

SSRs under 100A have become pretty affordable. Still looking at 3x the cost of a standard contactor, but I guess cheaper than a breakdown.

 

[Darkwood]

Cheers for the replies, I am using 18a contractors I am switching a 1.5kw at 415v motor and a 0.37kw at 415v motor. 110v ac control voltage, moving the panel is too much work 95mm feeder 110kw motor and loads of external outgoing cables !

Use VSD's mounted on anti vibration mounts, no moving parts and more protection and control afforded.

 

[joel89]

Don't need a VSD, no need for variable speed atv 312s are £350 for a 1.5kw, I have a soft start for the main forge motor 110kw

 

[Darkwood]

It was a solution for your situe' ... not saying its speed control was needed etc, if you fit some form of SSR device its will still need semi conductor protection to boot and the cost start mounting.... plus you need to shop around a bit £350 for a 1.5kw is not a good deal... Ive just fitted a 1.5kw 1ph-3ph (output protected) £250 quid ..... note I put output protected because their is a range of budget drives out there that have dropped output protection without really telling you and giving what seems a deal and a half.

 

[joel89]

hmmm so a solid state is not wired the same as a dol start stop on circuit?

 

[joel89]

https://m.rs-online.com/h5/mobile/uk/catalog?url=/web/p/solid-state-contactors/8229357/