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# Generic Shaft | Programmable Parameters

**Shaft_on:**Selection of shaft operation. (On=Normal operation; Off=constant speed equal to reference speed wo)**Shaft_mod:**Selection of shaft model. (Internal: actual model; External: model supply by user)**Number of masses:**Number of masses in shaft model, 1, 5 or 10 masses.

This value must be 1 if there is no need for detailed shaft modelling. In this case, all the parameters (hi, di) must be concentrated in mass no 1. If detailed shaft modelling is necessary, you may select 5 or 10 masses. By selecting appropriate data for inertia and stiffness, it is possible to modelize any number of masses between 1 and 10. Using an infinite value for stiffness will result in grouping 2 masses together. If a 5 masses model is selected, all parameter related to the 5 first masses must be established.**ar_d1Start:**Value of ar_d1 during start-up time; This value helps to reach synchronism. (typically = 10)**ar_tStart:**Duration of startup time. (typically = 10s) (s)**ar_tg0:**Mechanical friction losses, applied on generator mass (pu)**ar_h1, ar_h2,...:**Mass inertia in second, based on generator BaseMVA (pu)**ar_k12, ar_k23,...:**Shaft stiffness coefficients in (pu/rad) based on turbine BaseMW (pu)**ar_d1, ar_d2,...:**Mass self-damping factors in (pu torque/pu speed) based on turbine BaseMW; This parameter is also called steam damping, will help to damp torsional oscillation. Typical value is 25% of inertia (pu).**ar_d12, ar_d23,...:**Shaft mutual-damping factors in (pu torque/pu speed) based on turbine**BaseMW;**This parameter is also called steam damping, will help to damp torsional oscillation. Typical value is 25% of inertia.**Generator mass:**Selection of mass number that represents the generator. This mass will receive the electrical torque signal.(Mass #1 or #2). Since the signal w is generator speed, w is then speed of mass #1 or #2 depending on this parameter. (Typically, 2 configurations are possible; First: Mass #1 is generator, and mass #2 is a gearbox. Second: Mass #1 is exciter, mass #2 is generator.**Low pressure turbine:**Selection of mass number that represents the low pressure turbine. Those masses will receive the mechanical torque tl, spitted in 50-50% on two masses. (Mass #3-4 or #4-5). Valid for 10-masses only.**Intermediate pressure turbine:**Selection of mass number that represents the intermediate pressure turbine. Those masses will receive the mechanical torque

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