HEMANG,
In reply to your PM...
This isnt easy. The place to start is to ring out the field devices (limits buttons lights motors etc) first. and mark them on a drawing to the controller terminals.
Panel drawings are always shown with the power off. So disconect the main power and ring it will a bellset. I have all kinds of fancy equipment but my 6 volt battery and bell work best for this.
I'm presuming that each device (relay, timer etc) has a name associated with it. If not then lable them R1, R2, T1 etc.. Same goes for the terminals. Each relay should have a contact or terminal point that will be connect to the contact by a shunt, and coil leads. Newer relays have pins that are marked 1,2,3 and so on. The relay sockets should also have the same markings.
for example a typ KH relay (4 pole form C) will have three terminal for each pole pole 1: 9=common, 5= N/0, 1=N/C. and so on. 13 & 14 are for the coil. Mark them on your drawing like so:
R5 R5 R10
*---] [---+---]/[-------( )----*??
5 9 | 9 1 13 14
|
| R10 R20
+---] [-------( )----*??
9 5 13 14
You have to place a lead on the bellset on one terminal on the strip and start ringing all the other devices. when you get a ring, check off the terminal on that device and draw a circuit from the terminal to it. Then go to the other side of the device and start ringing untill you get another hit..and so on. As you go along there will be fewer and fewer terminals and devices to check, so it will start to go faster.
You'll likely have to re-draw a rung a few times over and make changes so use a pencil and have an eraser at the ready.
I dont know how big your panel is but some elevators have hundreds of relays.. I've seen this process take up to a week. On a small panel you may get it in a day or so.
There's no easy answer. But once your able to create a workable drawing, it'll pay for it'self 10 fold over time.
Good luck with it.