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).
Fault analysis of Dynamo No.732 from chassis GH-66.
| Identifier | ExFiles\Box 47\4\ Scan184 | |
| Date | 14th May 1924 | |
| To RV/HM.{Capt. W. Hallam - Head Repairs} from EFC. EFC2/T14.5.24. X4383 X.4383 - RE DYNAMO No.732 EX CHASSIS GH-66. X4410 Upon examination of the above dynamo, together with the accompanying distribution box, we are entirely in agreement with the conclusion that the faults developed have been due to an open battery circuit, in fact on the distribution box in the condition received, the main or emergency fuse was not connected one end at all, and in any case only consists of two strands, where there should be three. It appears that this disconnection has been the cause of the failure. It seems possible that there was a short circuit which necessitated the replacement of the fuse and that the fuse was incorrectly replaced, as it is extremely unlikely that the distribution box left us with the main fuse of two strands only. Therefore the failure appears to us to be due to laxity on the part of the customer. This is also evidenced by the fact that two other fuse wires are not in place at all. We have, as you know, experiments in progress on the cartridge type field fuse, with a view to eliminating the possibility of this trouble due to open battery circuit, provided R.{Sir Henry Royce} will consent to the standardisation of this scheme. We herewith return the dynamo and distribution box. The dynamo requires the commutator connections resoldering and the machine resetting to production test. It is possible that the field coils will require replacing as they may be charred. It was found that the dynamo, even with the solder thrown, behaved all right on test. There is little likelihood that the armature itself is damaged. As regards the distribution board, an open circuit has developed in the shunt coil, but in any case this coil will need replacing. EFC. | ||