Thor, or should that be Zeus?

[AndrewMawson]

No nothing received !

[Chaz]

No nothing received !

Will PM you.

[Chaz]

Ok, I missed a digit in the number. That's why you didnt get it.

[Chaz]

Two questions.

1. Inverters / VFDs.

I was sent two in error for the 4KW Chinese spindle. One is a 220V input, the other 380V. My logic says that I can use either with a 220V input (single phase) and that the 380V could later be used if I had a 3 phase 380V supply (different motor).

The supplier indicates that the 380V one (with a 220V input) will damage the 220V spindle.

Thoughts?

2. I am looking to use NPN proximity switches for home locations. Easy.

The CS Labs IPA unit document shows an example where normal switches are used where home and -- (limit) is the same switch and then ++ (limit) is a different switch.

Is this commonly done? I was under the impression that there are only very limited inputs that Mach 3 will accept as limits (from 9 to 13 from memory).

Thanks

[m_c]

1 will depend on if the 380V inverter can be set to work with 220V. It'll need the DC bus voltage limits changed to stop it faulting due to too low a voltage.
The output will be configurable for the motor. IIRC you need to set the point at which the voltage gets limited, rather than the current, otherwise you will risk cooking the motor at higher RPM.

2. Have not got a clue, as it's that long since I've configured anything in Mach.

[Chaz]

1 will depend on if the 380V inverter can be set to work with 220V. It'll need the DC bus voltage limits changed to stop it faulting due to too low a voltage.
The output will be configurable for the motor. IIRC you need to set the point at which the voltage gets limited, rather than the current, otherwise you will risk cooking the motor at higher RPM.

2. Have not got a clue, as it's that long since I've configured anything in Mach.

Thanks, probably not worth the effort / concern then. Ill just return the 380V one.

Ill play around with the proxy switches this week / weekend. I wasnt aware home / limit could be the same switch. I cant afford a run away going past my limits - the damage with these motors / big components is difficult / expensive to fix.

[Desertboy]

Thanks, probably not worth the effort / concern then. Ill just return the 380V one.

Ill play around with the proxy switches this week / weekend. I wasnt aware home / limit could be the same switch. I cant afford a run away going past my limits - the damage with these motors / big components is difficult / expensive to fix.

Morning hows things today? Just been to vote ;)

I hear you there I'd imagine a crash would be a very bad thing.

What I would worry with an inductive probe is a stray chip triggering a max limit, I'm going to use high quality microswitches wired so if the connection drops off it will fault. (I think NC but too early for my brain this morning.)

I found the best quality microswitches I've come across cheap are proper arcade microswitches.