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).
Continued list of test procedures for a dynamo, covering performance and condition checks.
| Identifier | ExFiles\Box 70\4\ scan0081 | |
| Date | 6th July 1927 guessed | |
| -3- Contd. (5) At the termination of the above run, observations shall be made of the output of the machine at this same speed of 1250 r.p.m. which output should lie between 12.0 and 13.0 amperes, the terminal voltage being adjusted to 18.0±.1 (6) With the dynamo still in the same hot condition it should be verified that running on open circuit it shews a voltage of at least 13.6 at 550 r.p.m. (7) The dynamo shall again be run on load and its speed varied up and down with a view to testing for mechanical and electrical noise. (8) The dynamo shall now be run up to 3600 r.p.m. still on load, and shall shew no abnormal brush sparking. Further, the mechanical vibration due to any want of balance shall not be excessive. (9) Examine also for rubbing armature, slack bearings, cracked insulation and final condition of commutator and brush surfaces. (10) The insulation of the machine should be tested while still hot by applying through a low c.p. 200 volt lamp an alternating voltage of 200 between the windings and the frame, when the lamp should shew no sign of being lighted. EFC. | ||