Interface 3ph rotary switch with low voltage

**cba_melbourne** · 13th May 2015, 05:54 PM

Originally Posted by BobL

.....d so what I'm really chasing is switchgear that is larger and more rugged than a $2.50 switch, and separate ON and OFF switches...........

eBay is your friend. But you must not be in a hurry. I graze regularly eBay for some new old stock switchgear at fantastic prices. Over the years I have won some useful industrial quality rotary switches and push buttons and the like. One search word that brought me some rotary switch bargains over the years was "Naimer" which seems to be a popular maker in Australia. If you need it now, you better buy from a large dealer at full price. Because nowdays bargains on eBay need patience and time.

Originally Posted by BobL

.............
Separate switches make real sense in these environments. One problem with a single ON/OFF switch is that even if it's clearly labelled, in the confusion of an emergency, there is a chance that if nothing seems to be happening that users will push a switch multiple times.

This means that if someone hits the single ON/OFF switch to turn it off and nothing seems to be happening (i.e. big machine takes time to slow down) the user might think he has not turned it off and inadvertently turn it back on. That's why I want separate ON and OFF switches.

That is why I want rotary switches, because these both visually and by feel let the user know in which position the switch currently is. Neither push buttons or toggle switches can do this. I also always install a red mushroom button or two for those panic moments. With the proper latching to make it impossible the motor turns on after a power failure. I am very safety conscious - even if it is only my hobby shed without any employees, even if I insist on real mineral glass in my glasses

. Safe is, who takes full and unconditional responsibility for his own safety - and not necessarily who blindly follows the latest fashion in rules or standards.

**BobL** · 13th May 2015, 09:34 PM

OK rotary switch with push button emergency off switch it is.

**variant22** · 15th May 2015, 09:19 PM

I have finally pulled the drum switch and wired it up to the Huanyang VFD. All is going well in terms of switching between FWD and REV. I am however stuck on one speed. I want to be able to tell the VFD to run at a default speed of 715rpm (25hz), and a high speed of 1430rpm (50hz).

I thought I could set the default the frequency to 25hz to run the motor at half speed, then light up the SPH wire and see it jump to 50hz. I set SPH (PD047) to 22 (High Speed) and set PD088 to 50hz. Unfortunately the motor sits on the same speed 715rpm @25hz..

Any ideas?

**Stustoys** · 15th May 2015, 10:07 PM

So you have PD003=25? and PD005=???(50 I assume)

Stuart

**variant22** · 15th May 2015, 10:15 PM

Originally Posted by Stustoys

So you have PD003=25? and PD005=???(50 I assume)

Stuart

Yes. PD003 is 25hz and PD005 is 50hz.

**Stustoys** · 15th May 2015, 10:35 PM

Its chilly out there. lol

PD080=2?

Stuart

**variant22** · 15th May 2015, 10:42 PM

Originally Posted by Stustoys

Its chilly out there. lol

PD080=2?

Stuart

Freezing in the garage. I just set P080 to 2. No change. Still sits on 715rpm..

**variant22** · 15th May 2015, 10:53 PM

Could it be that having 12v going to FWD (or REV) and SPH being fed 12v simultaneously happens to cancel out the speed setting? Maybe direction has to be set then speed after some arbitrary time period? I hope not as that will require additional components.

**Stustoys** · 15th May 2015, 11:03 PM

Well it works my end.

Ok, even with the VSD output off, when you connect DCM to SPH the Freq on the VSD should change. So if you wire in a switch between DCM and PSH, turn the VSD(input) on, when you switch, the freq display should change back and forth between 25 and 50.... if not its a VSD setting......... if it does your machine wiring is wrong.

Stuart

**Stustoys** · 15th May 2015, 11:06 PM

Originally Posted by variant22

Could it be that having 12v going to FWD (or REV) and SPH being fed 12v simultaneously happens to cancel out the speed setting? Maybe direction has to be set then speed after some arbitrary time period? I hope not as that will require additional components.

Not on mine. SPH changes speed anytime.

Stuart

**variant22** · 15th May 2015, 11:14 PM

Originally Posted by Stustoys

Not on mine. SPH changes speed anytime.

Stuart

Thanks Stuart. Good to know.

Incidentally what is your PD047 set to?

**Stustoys** · 15th May 2015, 11:21 PM

Pd0047=22

**variant22** · 15th May 2015, 11:26 PM

Originally Posted by Stustoys

Pd0047=22

Ok. Rules that one out. I will keep hunting. Can't be far off.

**Stustoys** · 15th May 2015, 11:39 PM

Did you connect DCM to SHP and get no Freq change?

Hmm are you using two or three wire control?

**variant22** · 15th May 2015, 11:45 PM

I did a reset and plugged the settings back in. Working a charm now. I likely had a setting wrong somewhere from when I was troubleshooting. I think the difference this time around was the PD080. Big thanks Stuart. It will be going into the Boley tomorrow.

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