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 electrical arrangement and functionality of an auto-switch shunt coil and charging switch.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 106 | |
| Date | 4th December 1926 | |
| -3- Contd. It will be seen that with this connection it will not be possible for a temporarily high dynamo voltage to be applied to the auto-switch shunt coil and apart from that phenomenon the functioning of these auto-switches has been observed to be very satisfactory, i.e. starting on contact they definitely operate and cause reduced rate of charge when the voltage reaches a suitable figure, and restore full rate when hand lamps are switched on, and we have found no ill effect of preventing the switch to function due to the phenomenon referred to in the report AC.79 under cover of our EFCl/T4.12.26. The electrical arrangement thus arrived at will no doubt be satisfactory so long as the charging switch is retained. But with the use of an auto charge reducing switch the suggestion arises that there is no need of a charging switch at all, and that it should be deleted. Deletion of the charging switch would at once overcome the difficulty arising from the varying opinions as to the relative merits of the various positions on our present switch in respect of the ignitions. We should then simply have B, M & B, and M, and charge would be always on. In that case, however, it would be necessary to revert to the first tried connection of the auto-switch shunt coil (unless we arranged a contact for switching this coil on to the battery in all three positions B, M & B and M), and it would be necessary to overcome the phenomenon described by providing the contacts Contd. | ||