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Single Phase Contactor Wiring

Created by: DonP at: 7/16/2012 8:34 PM (5 Replies)

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7/16/2012 8:34 PM	Rate (0)
DonP Posts: 4 Rating: (0)	I have a customer with a single phase, dual voltage (115/230V) motor. He has a Siemens 43CP12FB reversing contactor and a 3UB8823-4DW2 overload. With the supplied wiring diagrams and/or searching on Siemens website, I cannot find out how this should wired. His motor has 6 leads, and to reverse direction, L1 & L2 are swapped for T5 & T8. Hoping someone can point me in the right direction. The Industrial Controls catalog shows 3 of 6 motor leads.
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7/16/2012 9:04 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 12/15/2022 Posts: 5697 Rating: (702)	Hello, Best thing to do in this case is attach a picture off the motor indentification plate and the connection box. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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7/16/2012 9:34 PM

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DonP

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Here's what I have for motor connections:

		L1	L2	Join
230V	CCW	T1	T4, T5	T2, T3, T8
	CW	T1	T4, T8	T2, T3, T5
115V	CCW	T1, T3, T8	T2, T4, T5
	CW	T1, T3, T5	T2, T4, T8

Customer doesn't care which voltage, he can supply both, wondering how to do this with the above referenced contactor and overload. I don't have the contactor or overload available to me, just catalogs that don't seem to show valid wiring.

7/16/2012 9:45 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 3/21/2023 Posts: 13199 Rating: (2146)	Is this a single-phase motor? Typically reversing contactors work for three-phase motorsby helping reverse the phase of two legs of the 3 phases, and include some mechanical interlocking (to prevent both forward and reverse contacts from being closed at the same time). In my experience,single-phase motor reversal is normally a one-time event - done at installation.
	science guy
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7/16/2012 9:47 PM

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Marcjan

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Joined: 4/22/2010

Last visit: 12/15/2022

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Hello,

I think you should read the schematic like this.

For 230 V motor running counter-clockwise (ccw)

connect L1 to T1
Connect L2 (N) to T4 and T5
T2, T3 and T8 should be connected together

CW= clockwise an you should make the connections as shown in table.

So you have to swap T8 with T5 for changing direction.

		L1	L2	Join
230V	CCW	T1	T4, T5	T2, T3, T8
	CW	T1	T4, T8	T2, T3, T5
115V	CCW	T1, T3, T8	T2, T4, T5
	CW	T1, T3, T5	T2, T4, T8

Regards,

Marcjan

Last edited by: Marcjan at: 7/16/2012 10:06 PM

Last edited by: Marcjan at: 7/16/2012 9:51 PM

Problem solved?
Please let us know!

Please no technical questions by PM, use the forum sections for your questions.

7/16/2012 10:04 PM	Rate (0)
DonP Posts: 4 Rating: (0)	Yes this is a single phase motor. It runs a commercially available tubing bender and needs to go forward and reverse. Existing contactor/overload was discarded, no wiring diagram made. OEM is no longer in business. Siemens sells the 43CP12FB (catalog shows this number, Industry Malls lists it as US2:43CP12BF) as a single phase reversing contactor.
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Created by: DonP at: 7/16/2012 8:34 PM (5 Replies)

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Last edited by: Marcjan at: 7/16/2012 10:06 PM

Last edited by: Marcjan at: 7/16/2012 9:51 PM

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