Start stop switch help?

B

big dawg

Plastic

Joined

Jan 14, 2023

• Saturday at 11:00 AM

• #1

I recently purchased a monarch 1947 18c. It ran on 480 and I
watched it run. I'm converting to run 240 by a rpc.i wired it up and hit start and nothing,opened contactor box and manually pushed contactor in [it has two] and motor started and ran good. Any opinions on why these contacts wont pull in? New to three phase and motor controls. Thanks

 

J

Jdub63

Aluminum

Joined

Jan 10, 2020

• Saturday at 11:13 AM

• #2

Probably the wrong voltage to the coil. Cal has a great write-up on motor starter configurations for the 10EE, most of the basics will apply to your contactor. You'll need to change the heaters too.

https://www.practicalmachinist.com/...-with-cutler-hammer-contactor-revised.212560/

 

Last edited: Saturday at 11:37 AM

C

Cal Haines

Diamond

Joined

Sep 19, 2002

Location

Tucson, AZ

• Saturday at 1:15 PM

• #3

I agree. Please post photos of the contactor so we can see what you have.

 

B

big dawg

Plastic

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Jan 14, 2023

• Saturday at 4:02 PM

• #4

I'm trying but it keeps saying file is too large

 

B

big dawg

Plastic

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Jan 14, 2023

• Saturday at 4:04 PM

• #5

 

B

big dawg

Plastic

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Jan 14, 2023

• Saturday at 4:06 PM

• #6

 

C

Cal Haines

Diamond

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Sep 19, 2002

Location

Tucson, AZ

• Saturday at 4:10 PM

• #7

I don't recognize that one. Can you find a manufactures name on it?

 

johnoder

Diamond

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Jul 16, 2004

Location

Houston, TX USA

• Saturday at 4:13 PM

• #8

The pair of "pale green" things are the coils. Lower edge appears to say what their operating volatge is. You are not there yet in that regard

 

B

big dawg

Plastic

Joined

Jan 14, 2023

• Saturday at 4:34 PM

• #9

Ok contactors say 15d22g4 460v 60hz/380v50hz. Why is there two? Does one forward and other reverse? There is a forward reverse switch on top of the box that the contactors are in

 

B

big dawg

Plastic

Joined

Jan 14, 2023

• Saturday at 4:35 PM

• #10

Couldn't see brand name on them

 

johnoder

Diamond

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Jul 16, 2004

Location

Houston, TX USA

• Saturday at 4:40 PM

• #11

big dawg said:

Ok contactors say 15d22g4 460v 60hz/380v50hz. Why is there two? Does one forward and other reverse? There is a forward reverse switch on top of the box that the contactors are in

Click to expand...

Reversing (also two speed) starters have two coils and two sets of contacts - and it is normal for them to be mechanically interlocked.

In this case, if the coils are 460 they worked fine until the 240 came along to replace the 460. Now you need a control transformer that fixes that particular situation - so the coils will work again

 

Last edited: Saturday at 4:45 PM

B

big dawg

Plastic

Joined

Jan 14, 2023

• Saturday at 4:40 PM

• #12

Auxiliary contact is a ge cr106x 600v max and a ge overload relay cr124

 

B

big dawg

Plastic

Joined

Jan 14, 2023

• Saturday at 5:05 PM

• #13

johnoder said:

Reversing (also two speed) starters have two coils and two sets of contacts - and it is normal for them to be mechanically interlocked.

In this case, if the coils are 460 they worked fine until the 240 came along to replace the 460. Now you need a control transformer that fixes that particular situation - so the coils will work again

Click to expand...

Thanks john can you steer me in a direction on where and what size I need?

 

johnoder

Diamond

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Jul 16, 2004

Location

Houston, TX USA

• Saturday at 7:29 PM

• #14

big dawg said:

Thanks john can you steer me in a direction on where and what size I need?

Click to expand...

Probably not except as to Volts in and out. A little one like so may be appropriate - if only because it can take in 240 and get out 480 (even if hooking up "backwards" is needed). As to its required amps, that is an unresolved issue that can be worked on by real electrical folks.

HAMMOND SP250MQMJ 250 VA 240X480 120X240 | Gordon Electric Supply, Inc.

HAMMOND SP250MQMJ 250 VA 240X480 120X240

www.gordonelectricsupply.com

 

B

big dawg

Plastic

Joined

Jan 14, 2023

• Saturday at 8:27 PM

• #15

Ok thanks for the info

 

johnoder

Diamond

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Jul 16, 2004

Location

Houston, TX USA

• Saturday at 8:45 PM

• #16

big dawg said:

Ok thanks for the info

Click to expand...

Good stuff here if you like

Monarch Machine Tool Co. - Publication Reprints | VintageMachinery.org