(16-06-2010, 04:28 PM)Archie Wrote: It's just a picture of terminations to a 'pump handle' points machine, hopefully you can clearly see on the right hand side of the picture, the terminations for WM+, WM-, meaning the points motor, and different polarities, RW+, RW- (reverse points, again different polarities, and finally NW+, NW- (normal points), on different polarities, this was done on a 'seven core,' cable but there is obviously only 6 terminations here leaving one spare.
In the second photo it basically shows the 'four core' cable terminated into a 'disc box' which if I hadn't of lost the picture you would of seen that it is actually mounted onto the points machine itself.
Did you actually post 2 pictures? I only see the one of the 4c in dis box.
Yes this shows the pre-terminated leads (otherwise known as "flipper cables") used for clamplocks. These are colour coded with yellow and black ends as they are used to connect dis box to the left hand mech, then left hand mech to right hand mech, then right hand mech back to disbox (or vice versa depending upon which is the normally closed switch tongue). The disbox is often supported on the same concrete base as is under the hydraulic power pack; it is mounted at the back (rather than at the edge where someone manually pumping the points would be standing).
The 4c cables in this disbox brings the detection voltage from the location and then feed the NKR and RKR detection relays back in the location; see attachment.
Generally in my experience the 7c cable terminates directly on links in the clamplock power pack (although I think the newer ones may have plugcoupler connections); there are indeed 6 cores used for 3 separate ciircuits: Normal valve feed, Reverse valve feed and the pump motor.
If you attempt to operate the points manually and just start pumping without holding the "gearstick" in the appropriate direction to mechanically operate the relevant valve, you'll find the pumping very hard going and completely ineffective as what you are trying to do is compress the hhydraulic oil without giving it anywhere to flow to!
PJW