From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The operation and installation of an automatic electrical switch for a vehicle's lighting and charging system.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 152 | |
| Date | 11th November 1927 | |
| -4- Contd. In this form it is not impossible that the auto switch might make contact again after the battery has been discharging through a comparatively light load for some time without the charge switch being put off. It is intended to make contact again in any case every time the headlamps are put on and we hope to be able to so arrange it that it does so immediately and every time the headlamps are put on, though it does not necessarily do so when only the side lamps are put on. This arrangement gives the same degree of protection as was detailed in our previous report EFC3/T11.11.27, irrespective of the nature of the load, because there is no load which, by producing negative ampere turns, can so put up the voltage at which the auto switch breaks as to allow a higher voltage than the normal operating voltage of the auto switch to exist on the system. In placing such a unit on the existing chassis system it only means inserting the two circuits of the auto switch in their respective positions electrically in the chassis system, i.e. one circuit in the existing dynamo field wire, and one between terminal B of the distribution board and chassis frame. It will be noted that in each case in normal running of making the auto-switch open and making it close, we are making use of a momentary current of higher value than that to which it afterwards settles down. EFC. | ||