GR Ground Relay Energized in event of a ground in the main power circuits. Alarm bells ring on all units, and white light lights on control panel of unit affected. De-energizes TV to bring engine speed to idle. GSR Generator Surge Relay Designed to energize to event of a main generator flashover. Set to operate at 190 amps in main generator field.
Functions are identical to the ground relay.
Shuts engine down if engine lubricating oil pressure falls too low for engine speed being maintained. Controlled by FS1, FS2 and FS3. Alarm bells ring on all units and blue light lights on control panel of unit affected. De-energizes EF and GF to remove power. De-energizes B1 to drop braking on unit affected.