Lynx SM 16 wiring anomoly - help

**Nemo1966** · 15-09-2020

Got a Lynx SM 16 controlling a servo spindle drive, it has a contactor between the main power supply (240v) and the lynx. However the contactor seems to be wired so the live is going to the Neutral on the Lynx. I am a little worried as i do not want to apply power and blow it up. See picture:
(PS: the contactor was pre-wired - I didn't do it)

Pic below has contactor info inlaid

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Please advise

thanks

**JAZZCNC** · 15-09-2020

While it's not technically correct it won't do any damage because it's AC. However, for the 1 min, it takes to swap it over then I would do so just to save any confusion.

**Nemo1966** · 15-09-2020

Originally Posted by JAZZCNC

While it's not technically correct it won't do any damage because it's AC. However, for the 1 min, it takes to swap it over then I would do so just to save any confusion.

Thank you - I don't suppose you know anything about contactors do you?

This one looks wired as if it is an AC coil (the 240v neutral loops back into the coil). Any idea what sort of ampage the coil will use on these? I have looked all over tinterweb and can find zero info.

I was wanting to put a 1 amp fuse on it.

thanks again

**JAZZCNC** · 15-09-2020

Originally Posted by Nemo1966

Thank you - I don't suppose you know anything about contactors do you?

This one looks wired as if it is an AC coil (the 240v neutral loops back into the coil). Any idea what sort of ampage the coil will use on these? I have looked all over tinterweb and can find zero info.

I was wanting to put a 1 amp fuse on it.

thanks again

Typically on an AC contactor of this size, you'll have a Pickup rating of around 70Va with a Holding Va of about 8-10. So on 230vac, you are looking in the 0.4a range at worst on start-up and far less when holding so your well in at 1A.

**Nemo1966** · 15-09-2020

Originally Posted by JAZZCNC

Typically on an AC contactor of this size, you'll have a Pickup rating of around 70Va with a Holding Va of about 8-10. So on 230vac, you are looking in the 0.4a range at worst on start-up and far less when holding so your well in at 1A.

Absolute gent - thank you very much

**Nemo1966** · 16-09-2020

Originally Posted by JAZZCNC

Typically on an AC contactor of this size, you'll have a Pickup rating of around 70Va with a Holding Va of about 8-10. So on 230vac, you are looking in the 0.4a range at worst on start-up and far less when holding so your well in at 1A.

One last thing, if I may. The manual seems to be a bit ambiguous with regards to the 0 - 10v speed controller input.

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"Set speed Term 3: Potentiometer minimum or 0 to +10V, impedence 100K ohm filtered"

So, Potentiomemrer or 0 - 10v, yep all good... impedence 100K filtered???

The diagram shows:

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The reason I ask is that only 2 wires were connected originally (to 2 and 3). I'm guessing a 0 - 10v.

I do not quite understand this sign in the picture:

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I am connecting to an MB3 breakout board with a 0 - 10v, page 20 on the link below for details
http://www.cncroom.com/downloads/MB3...al%20E13R1.pdf

Any help gratefully recieved

**cropwell** · 16-09-2020

I would guess that 100K impedance means that internally the input has the equivalent of a 100K resistor (impedance is AC resistance, so not quite the same as DC resistance). This is to limit current when the potentiometer is at the 10v end.

My further guess is that the input has an internal filter.

Please somebody inform me if I am way off beam!

Rob.

**Nemo1966** · 16-09-2020

Originally Posted by cropwell

I would guess that 100K impedance means that internally the input has the equivalent of a 100K resistor (impedance is AC resistance, so not quite the same as DC resistance). This is to limit current when the potentiometer is at the 10v end.

My further guess is that the input has an internal filter.

Please somebody inform me if I am way off beam!

Rob.

Mmmmm now I assumed the 0 - 10v input was DC

**cropwell** · 16-09-2020

Originally Posted by Nemo1966

Mmmmm now I assumed the 0 - 10v input was DC

It is. but they quoted an impedance which is generally used for AC signal inputs. 100K impedance means that the current from the pot wiper is very low.

**Nemo1966** · 16-09-2020

Originally Posted by cropwell

It is. but they quoted an impedance which is generally used for AC signal inputs. 100K impedance means that the current from the pot wiper is very low.

OK - (probably got this wrong) are you saying the input impedence is basically circuit to restrict the ampage coming in???? and are you saying this circuit is already built in?