underspeed condition

underspeed condition

underspeed condition
Underspeed: High-pressure oil enters propeller line to decrease the pitch.
A governor is in its underspeed condition when the engine is operating at a speed lower than the governor calls for. The condition occurs when the blades of a propeller move to a higher than normal angle for a constant speed condition for any reason. When the speed drops below the RPM for which the governor is set, the resulting decrease in centrifugal force lowers the pilot valve, thereby opening the propeller-governor metering port. Oil is directed to the propeller in the proper direction to correct the underspeed condition. See also overspeed governor.
References in periodicals archive ?
Because the drive motors on the majority of conveyor systems operate at a fixed speed, the factors that cause an underspeed condition also result in the motor(s) working harder to maintain the correct speed.
However, if the target remains in the sensing zone for too long, the signal will indicate an underspeed condition.
Properly applied, motion detection devices can signal underspeed conditions be[ore conveyor drive motors overload and trip.
By detecting underspeed conditions before thermal overload relays in motors trip, motion detection improves productivity and increases conveyor uptime.