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 output, voltage, noise, and insulation checks.
| Identifier | ExFiles\Box 70\4\ scan0072 | |
| Date | 13th April 1927 guessed | |
| -3- Contd. (5) At the termination of the above run, and after a quick final examination and passing of the brush bedding and commutator condition, observations shall be made of the output of the machine at this same speed of 1300 r.p.m. which output should lie between 11.0 and 12.0 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 630 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 not 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, etc. (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. | ||