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help needed to wire a contactor with an on and off switch have tried different combinations but cannot seem to get it to latch and stay on .Any help would be much appreciated.
If you are using a momentary P.B. to pick the contactor up, you need a N.O. aux contact on the contactor that is wired in parallel with the P.B.
If you have a latch type E-stop button or similar, you do not need a latch contact.
For the first example you would also need a stop or N.C. Stop P.B.
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
hi al
my contactor has L1 L2 L3 20NC and A1 on top T1 T2 T3 22NC and A2
any chance you could do me a small diagram of conections thanks
John
forgot to add my switch has pb start and pb stop also has a light in centre .
john
L1, L2, & L3 tie directly across to T1, T2 & T3. A1 & A2 are for locking the coil therefore completing the circuits. What is the voltage of the coil/contactor? Are you using it for 220V or 120v or something else? Is your PB start momentary? Do you have a latching Estop?
If you have a dual stop/start PB station then you need to wire a N.O. aux latching contact on the contactor in parallel with the start P.B.
See CRM example in the PDF.
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
This was a picture of me during the set up of mine. It now functions in this sequence. Flip on power (energizes the incoming side of the contactor, if the E Stop is out it also enables power to the momentary switch) upon pressing the momentary switch the contacts are closed allowing power thru all L1-T1 connections etc. A2 gets fed off of the T side thru the E stop switch. Press the E Stop no power to the coils, all power is off.
dont have a no on my contactor it is nc which is connecter 21 top and 22 on the bottom
What make of contactor? many of the DIN style have the option of clipping N.O./N.C. auxiliary contacts on the front.
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
coil is 220 vlts and pb start is momentary.
Thats normal on a dual PB station.Originally Posted by johnmb
That is why you need the retaining contact.
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
schnieder contactor LC1K090107
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