Can Anyone Help On Electric Over-Head Crane Pendant Cable Wiring Diagram

Some of the symbols are unclear, but it may be that each pushbutton has a normally closed contact (the middle one shown), a normally open low speed contact, and a normally open high speed contact. Can you verify how each contact behaves as the button is progressively pushed?

In this new pendant, I don't see any mechanical interlocking. Can you verify that?

The push button is two speed. pressed half way through, its low speed, pressed further down, its high speed. with regards to mechanical interlocking, i aint sure i really understand tht but r u refering to a common link for the terminals? this is just how the push button came. THANKS FOR UR REPLY BY THE WAY

Mechanical interlocking means that when one button is pressed, its counterpart cannot be pressed at the same time. This can be done with levers, for instance.

Electrical interlocking means that power goes through a normally closed contact of one button to the normally open contact(s) of the counterpart button. Thus pressing one button keeps power from getting to the other. I can't tell for sure, but it looks as though your new pendant uses this method.

As has already been noted by others, you will get no useful information without an "as wired" circuit diagram of your crane.

The switches shown in that pic are a standard Schneider push button with 1 N/C (21-22), 1 N/O (half push, (low speed) 13-14) and 1 N/O (full push (high speed)33-34) They don't normally utilise a mechanical interlock, instead using the N/C contacts for electrical isolation of other related operations when the button is pressed.

I suspect that even had the pendant been supplied with the cable, you would still be having this problem

If you can't do a simple change over from the old to the new, then you should seek an electrically competent person who can.

i think u're d best reply here outta all i'v got. thanks a lot. u sound like someone who knws exactly wot he's saying. I think there is a circuit diagram of a similar crane. maybe il post the pic here later for u to have a view so we see if it can help with the pendant hook up. But u knw tht crane wiring is quite different from general electrical wiring. so i was hoping to see someone who has an idea about wiring it before. but am still searching. i dont wanna just give it to a general electrical guy to come mess de crane up. am still looking for a competent person tht have done de job somewhere else. i was just thinking i could see someone here tht can gimme a guide to guide way to do it myself. thanks once more

You already started a topic here, and I already replied there:

http://cr4.globalspec.com/thread/98189/Can-Anyone-Help-On-Electric-Over-Head-Crane-Pendant-Cable-Wiring-Diagram

and also you reposted the same picture.

I don't understand why you start another topic and keep replying in the existing one. Having parallel topics should not be allowed.

Am new here and dont exactly knw hw this forum works. but y i posted in this thread the same topic i did at the other thread is because i guess i stand a better chance to be helped by the electrical guys here

It isn't.

Even if you're new here, it doesn't make sense to ask the same questions at several places in a forum as some will waste their time answering already answered questions

The contact blocks of your picture are from Telemecanique (now Schneider Electric), about the most widespread pendant switches anyway so please do your homework and check the manufacturer's website as you'll find all technical documentation for those pushbuttons there and beside that the terminal numbering is standard (and you can simply use a multimeter or a continuity checker if you can no longer read the tampon-printed symbols on the contact blocks).

I suppose you draw a diagram when disconnecting the original connections and marked the wires accordingly. If you didn't... Well... What should I add...

Hire an electrician to install the pendant. Have a kid teach you how to use your computer.

Succinct and snarky.

I think we were all trying to find a polite way to tell the OP "Quit typing in NetSpeak and use English," but you beat us to the punch.

I have to agree with you here, rewiring the new pendant looks to be beyond the OP's skill level, and probably WELL above his threshold for liability if he makes a mistake and the overhead crane it controls kills someone. He should get some professional help to complete the task.

If you have no circuit diagram of the existing crane control then trace out the wiring through trial and error methods. You still have the old pendant attached, trace out the whole circuit from scratch, it isn't hard. If the original crane manufacturer cannot or won't help this is the only thing you can do !!

Crane control systems vary greatly, with NO information provided on the crane brand and model we cannot provide you a wiring diagram. Even with this information if the crane has a special variant pendant the wiring diagram could be a custom design.

And you can take that from

a) Someone who used to actually sell cranes

and

b) Someone who used to custom modify existing crane control systems and wiring diagrams to add customer specific control elements.

Why all this discussion?

This is a quite basic task everyone having some basic knowledge in electrical controls should be able to do. Even if there are lots of different cranes, pendants tend to be wired according to a few basic families of schemes and unless you've analogic joysticks, load displays, capacitive dead-man control and other oddities it's not a big deal to rewire a pendant (I know because I've planned and installed wireless remotes for various existing cranes).

Now either you have the knowledge to do it yourself or you haven't in which case you should ask someone else to it as you'll likely end messing up something and waste a lot of time for nothing before having to call someone else anyway.

Without detailed wiring diagram we can't help you and without a good crystal ball we can't check the effective wiring either. Be also aware that wiring diagrames are not always up-to-date.

Just to say if you don't know what your doing then DON'T this job yourself.

Pay a competant trained person to do it.

If you get it wrong you could kill someone. Don't take the risk.

We had a fault with the pendant for the crane here, once opened up I am sure that I could have fixed the fault but I didn't know what I was doing so I paid a company to come in and fix it. They did a good job and for piece of mind and knowing the crane will work correctly it was a price I was willing to pay.

It will not cost too much and is better than asking a lot of "random" people on the net.

GA for Spades

Once again we are here DRAGGING the questions and answers out of another newbie. Here are a few standards that may help in the future.

1. Manufacturer or the product
2. Model number
3. Serial Number (Sometimes needed for specific parameters / settings)
4. Your experience level in the area of your question i.e. GURU or NEWBIE?
5. Specifics of the item in question.
6. Do not use acronyms unless they are widely known like OSHA is Occupational Safety and Health Administration or if they are obscure, spell them out at least once in the head of your question.
7. This forum is in English (at least on my computer) please use proper spelling.
8. A picture is worth a thousand words, make sure it is in focus and shows what you are questioning. ZOOM IN!

I agree with Spades. Get a competent electrician to wire it up. if you do it incorrectly, you are endangering yourself and your co-workers with the possibility of you cross phasing and having the pendant blow up in your hand or the motor contactors explode inside the hoist. I've seen it happen.
If you have the existing pendant connected still, draw up an electrical schematic of which button is connected to where and which contacts the wires land on. Typically the E-Stop in a N/C contact while the UP/DOWN and most others are N/O contacts. I wire these all the time. its easy if you are careful. that pendant is an expensive one. DON'T BLOW IT UP!!!