4-18 POWER TAKE-OFFS E UROCARGO Euro 4/5 The maximum rpm N max is a theoretical value. It is the engine rpm at which the control unit reduces the injected quantity of fuel to 0 mg/stroke. Since all engines according to their speed (engine warm and with no load) need, in order to maintain this speed, a quantity of fuel of 20 to 30 mg/stroke, this theoretical value N max is never reached. Depending on the angle of the curve (gradient) of the overrev regulator, the rpm actually reached is lower than 10 to 40 rpm. If this affects the application, we advise defining the overrev speed with practical tests. ! 4.6.4 Intermediate speed rate governor Maximum No.
of revs of the intermediate speed regulator that can be reached with the SET+, N SET_max button The maximum number of revs obtainable with the SET+ button of the intermediate speed regulator (CC) can be configured. This limit is identical for all the PTO modes (drive mode 0, power take-off mode 1, 2 and 3). TIP function The TIP function, that is a a brief pressure ( rate regulator or speed regulator. With speed 0 (max speed of PTO mode) km/h the intermediate speed regulator can be acti- vated. With speed >V 0 km/h the speed control is activated. The change for the intermediate speed rate regulator is equal to 20 rpm for each TIP or 1 km/h for each TIP with the speed regulator.
If the SET+ and SET - buttons are pressed any longer (>1 s), the intermediate speed rate or the requested speed is modified continu- ously. The actual number of revs or true speed at the time of releasing the SET+ and SET - buttons is saved as the new required value. The TIP function with SET+ and SET- can be turned off. This configuration is valid for all the PTO modes (drive mode 0, PTO mode 1, 2 and 3). Turning off the TIP function triggers the functional limitation on the speed regulator. Therefore this change should only be used after a thorough examination. This function is for regulating the hydraulic units.
NOTE Increase/decrease in the speed with SET+/SET- With a longer pressure (>1 s) on the SET+/SET- buttons as well as with the TIP function turned off the required value of the intermediate speed rate regulator is modified with a determined speed (increase/decrease engine revs per second). The required time for this change can be calculated with the following formula: Required time [s] = Difference in number of revs [rpm/s] / increase in revs per second [rpm/s/s] Example: the intermediate number of revs must be taken from 800 rpm to 1800 rpm with the SET+ button. The difference in the number of revs is equal to 1000 rpm, therefore:
- with a speed of 250 rpm/s, the time interval is 1000/250 = 4s Accelerator pedal on/off In the normal drive mode (PTO mode 0) the accelerator pedal is always activated. In PTO modes 1, 2 or 3, the throttle pedal can be turned off. In this case the PTO setting of the engine ignores the accelerator pedal. If however the accelerator pedal remains on, it is possible to increase the number of revs of the engine with this pedal up to the maximum number of revs N max valid at that moment. PTO management Base - January 2008 Print 603.93.431