Visits to LMS have seen the completion of key electrical work on the cab. The most important achievement has been the installation of new wiring boxes under both crew seats, where our wiring has had to be significantly altered to free-up the space needed for the replacement TPWS equipment and new JRU system.
The fireman’s side box is in roughly the same location as a previous enclosure, but now has three MIL connectors mounted on its lid to keep these out of the way of the JRU. There is also a harness from it directly to the AS I/O Panel. The cables that plug into the four remaining connectors come up from the frames below.
On the driver’s side, the new TPWS equipment and wiring box leaves very little space for our systems, so we have adopted a different approach, fitting a new enclosure to the underside of the ES I/O Panel, where there is just sufficient space for it to clear the seat location upstand. This box also has three MIL connectors mounted on it, one for the sander indicator and the other two to connect to the ES wiring from the frames. From this box we also feed the power supplies from the ES I/O Panel to the TPWS and JRU, together with a new connection from our sander indicator circuit to allow recording of sander operation by the JRU.
Taken together, these two new boxes and their harnesses required the making of 174 new crimp connections.
On the tender, the ADA connection boxes have been completed and fully tested with a 28V power supply simulating the ADA output. The ETCS I/O Panel has also been fitted in its final location behind the handbrake handle to allow LMS to complete the fitting of the sealing plates around it.