586 ELECTRICAL EQUIPMENT 



The " Stand-by " signal is to be used during the cutting out of 

 units, tests, lightning storm, or other expected troubles. 



" Start ": Start unit at once on hand control. 



" Start Fast ": (Combination signal). Start unit as quickly 

 as possible. 



" Fast ": If unit is not on the bus, increase speed. If unit is 

 on the bus, increase gate opening gradually. If the signal is 

 flickered, increase rapidly. 



" Stop ": Shut down unit at once. 



" O.K. ": Unit on bus. Engage governor-control motor gear. 

 Conditions normal. Further attention not needed. Cancels 

 " Start " or " Fast " signal. The " O.K." signal is also used when 

 unit has come to rest and field has been taken off. 



The whistle used in this power station is electrically controlled 

 from the switchboard and is operated by compressed air at 300 

 pounds pressure. It is located at one end of the power-house and 

 is loud enough to be heard over the noise of the machinery in all 

 parts of the building, and can be heard outside the building for 

 quite a distance. It is used principally for calling persons con- 

 nected with the operation, the code being as follows: 



Attention to signals 



Assistant operator 



Machine man 



Lightning storm on 



" On hearing this signal a special arc extinguisher observer will 

 report to operator." 



Hydraulic floorman 



Hold frequency 



This is an emergency signal to be used in case the station is 

 swamped or running away. " If the station is swamped, force all 

 machines to full gate opening; if running away, close all hand- 

 control machines until frequency returns to normal. If governor 

 system has failed, governor machines must be changed over to 

 hand-control and regulated until frequency returns to normal. 

 Pumpman must make every effort to hold pressure on governor 

 and hand-control systems, starting pumps and taking any other 

 necessary steps. Extra men, unless otherwise detailed, to report 

 to floorman on governor floor." 



Emergency stand by 



" Serious general emergency existing or impending. All 



