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Contactors? Best reasonably priced

Posted: Sun Dec 17, 2017 12:46 pm
by frijoli
I am ordering components for my panel. I need 50A magnetic contactors according to DMM. Can that be correct for a 1kW drive?? Seems really high.
Where is the best place to buy these at reasonable prices?
DMM DYN4 schematic pic.JPG

Re: Contactors? Best reasonably priced

Posted: Sun Dec 17, 2017 2:03 pm
by DICKEYBIRD
Wow :o That C8's gonna twist itself into knots! All three axes cranking out 1 1/3 HP...at the same time? I think their contactor rating is for a much bigger machine. Check your PM in a few minutes.

Re: Contactors? Best reasonably priced

Posted: Sun Dec 17, 2017 2:39 pm
by frijoli
That's what I need to clarify DMM. The drive has a rating of 8 amps. They say in the manual to add 50A contact rating for each drive. That means I need 150A contactor!!! Something seems very wrong. lol
I am going to follow up with DMM Monday.

Clay

Re: Contactors? Best reasonably priced

Posted: Sun Dec 17, 2017 4:17 pm
by lilb93
I just got in my 3 DYN4 drives saturday and no where in the manual do I see it needs contactors. Just a e-stop to knock out the 24V

Re: Contactors? Best reasonably priced

Posted: Sun Dec 17, 2017 4:41 pm
by frijoli
lilb93 wrote: Sun Dec 17, 2017 4:17 pm I just got in my 3 DYN4 drives saturday and no where in the manual do I see it needs contactors. Just a e-stop to knock out the 24V
Did it come with a manual? I used the download manual.

Re: Contactors? Best reasonably priced

Posted: Sat Jan 13, 2018 11:52 am
by jason1098
I am ordering components for my panel. I need 50A magnetic contactors according to DMM. Can that be correct for a 1kW drive?? Seems really high.
Where is the best place to buy these at reasonable prices?
This threw me for a loop as well... Here's what I found when i was having the same problem:

If you look on page 23 of the manual, you'll see the notes that say:

3. Select circuit breaker (MCCB)
and magnetic contactor (MC1) with
enough capacity according to servo
drives connected.


So I take that to mean if each drive pulls 8.3A, you can use a 30A magnetic contactor... but that's how I read it. I'm still learning the high voltage wiring myself. I'd love to hear other's input about my assumption.

Image

Re: Contactors? Best reasonably priced

Posted: Sat Jan 13, 2018 12:53 pm
by frijoli
jason1098 wrote: Sat Jan 13, 2018 11:52 am
I am ordering components for my panel. I need 50A magnetic contactors according to DMM. Can that be correct for a 1kW drive?? Seems really high.
Where is the best place to buy these at reasonable prices?
This threw me for a loop as well... Here's what I found when i was having the same problem:

If you look on page 23 of the manual, you'll see the notes that say:

3. Select circuit breaker (MCCB)
and magnetic contactor (MC1) with
enough capacity according to servo
drives connected.


So I take that to mean if each drive pulls 8.3A, you can use a 30A magnetic contactor... but that's how I read it. I'm still learning the high voltage wiring myself. I'd love to hear other's input about my assumption.
Thanks, I didn't see that in the manual, but I went with what actually made sense to me, and purchased a 32amp contactor and some 30amp fuses.

Clay

Re: Contactors? Best reasonably priced

Posted: Sat Jan 13, 2018 6:29 pm
by martyscncgarage
I'm using something like this to power up the whole cabinet on the Phoenix 4x4 router:
2 Pole 30A 120V Definite Purpose Contactor Honeywell DP2030B5004 http://r.ebay.com/ixVmzy

This would be a good choice for the relay to Estop the power to the DYN4 drives. I'm not so sure I am worried about the logic supply side. No 240VAC to DYN4's= no servo motor movement.
These are good because they are 24VDC coils, you can run 24VDC through relay 1 (Estop relay) and then to the relay below (Or use a non relay output):
DAYTON 30A Enclosed Power RELAY Contactor 24 VDC 1EJH9 (12) http://r.ebay.com/XwmFJf
(These are what I am using to turn off and on the router motor and the dust collector)

The math:
750W servo, assuming 240VAC input:
750/240= 3.125A per servo motor
3.125A*3= 9.375A and that's, shall we say, balls out.

The relays above are DPST. They have 2 sets of contacts and they are normally open. Contact rating should be WAY more than enough for the 3 DYN4 drives running at 240VAC input.

I finished my backpanel, opened up my servo drive box and found 400W NEMA 23's instead of 750W NEMA 34's. I emailed DMM, hopefully they can ship the correct motors on Monday....it happens.

Marty

Re: Contactors? Best reasonably priced

Posted: Tue Jan 16, 2018 2:49 am
by ScotY
I don’t really understand how the MCCB and MC1 are wired up in that diagram. I know how a relay works but the diagram makes no sense to me. Can someone explain? I’ll need to do something for my single Dyn4 when I get around to wiring it up.

Re: Contactors? Best reasonably priced

Posted: Tue Jan 16, 2018 7:22 am
by frijoli
ScotY wrote: Tue Jan 16, 2018 2:49 am I don’t really understand how the MCCB and MC1 are wired up in that diagram. I know how a relay works but the diagram makes no sense to me. Can someone explain?
Below is a single phase 110 or 220 input at R/S. MCCB is a circuit breaker. I used fuses.
The branch has estop, the Master Control 1 coil, and on/off switch.
MC1 coil makes R/S come on when the circuit is closed.
R/S goes to the motor power.
L1, L2 branch off to the logic supply of the drive. Hence the EMI filter and low Ampere fuses.
Image