POWER TAKE-OFFS 4-17 E UROCARGO Euro 4/5 Please note that: - The bodybuilder chooses the engine speed up to which the selected torque must available according to the use planned for the PTO. - The speed referred to is that of the crankshaft and not that of the PTO, for which the RPM must be calculated taking into account the reduction ratio (Table 4.4 on page 4-12). - These limitations (maximum torque, intersection point and curve gradient) may be selected independently of one another. It is, however, advisable to set a combination. - These parameters may only be activated by IVECO. Figure 4.9 Maximum torque [Nm] Curve B Curve C Curve A Overrun regulator curve gradient:
600 Nm Varying overrun 0 ч 0,2 rpm/Nm Intersection point X Rpm [rpm] 126134 We will take a look at the example in Figure 4.9: - Max engine torque 600 Nm. - Standard power take-off operation is specified at 900 rpm. - The engine rpm must not exceed 1100 rpm. - The rpm must be calculated for all overrevving rpm regulator gradients. The corresponding power at 1100 rpm and a torque of 600 Nm gives (see equations on page 4-3). P = (600 Nm x 1100 rpm)/9550 = 69 kW= 94 hp The overrevving regulator curve gradient depends on the specific application.
With stationary operation, a steep overrevving rpm adjustment curve is therefore generally sufficient, while in driving mode this may give rise to rapid load changes (which could be a problem). Therefore: - with regulator at 0.05 rpm/Nm (curve C in figure), a torque of 600 Nm is available up to 1100 - (0.05 x 600) = 1070 rpm; - with regulator at 0.1 rpm/Nm (curve B), the torque is available up to 1040 rpm; - with regulator at 0.2 rpm/Nm (curve A), the torque is available up to 980 rpm. PTO management Print 603.93.431 Base - January 2008