GEARS Power take-off (PTO) All Wärtsilä gears can be supplied with one or more PTOs for driving the shaft alternator, compressor or pump. For single vertical and horizontal gears, the standard PTO is primary driven. For twin inputsingle output gears the PTO is optionally primary or secondary driven. A primary driven PTO is rotating whenever the engine is rotating. A secondary driven PTO is rotating whenever the propeller shaft is rotating. zz zz
Two speed PTOs are available on request. Power take-in (PTI) Most Wärtsilä gears can be supplied with a combined PTO/PTI. In PTI mode the shaft alternator can also be used as an electric motor. PTI is normally used for the following operation modes: PTI “Booster” mode is used when the main power of the engine is too small, in order to increase the total propulsion power. For this mode, no clutches are required on the gear. PTI “Take me home” mode is used in case of emergency, if the prime mover is out of operation. For this mode a minimum of 2 clutches are required on the gear. zz
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Two speed PTOs are available on request. Integrated or separate hydraulic system for gear and CP propeller Most Wärtsilä gears are purpose-designed with an integrated hydraulic system for both the gear and the CP propeller. As the separate hydraulic power unit for the CP propeller is superfluous, both installation costs for the yard and operational costs for the owner are reduced. For safety reasons the gear mechanically drives the main pump for the propeller. All gears can also be interfaced to a separate hydraulic power unit.
Wärtsilä gear type SCV128.