Bonfiglioli - Houston Bearing and Supply

6.0 - THERMAL CAPACITYP t [HP]«P t » is the horsepower that can be safely transmitted through the gear unit, under a continuousduty and at an ambient temperature of 70°F/20°C, without using a supplementary cooling system.Thermals are generally listed within the rating charts along with other key parameters. In thegearmotor rating charts « P t » values are highlighted when the installed horsepower exceeds thethermal rating. Should this be the case, it is recommended that the application is closely investigatedand that horsepower actually transmitted, without Service Factor, does not exceed the thermalcapacity, after this is adjusted with the applicable factors, « f t » and « f v , » depending on ambienttemperature, duty and drive speed.Make sure that the following condition is always satisfied:P r1 P t f t f v(4)(A1)t aIntermittent dutyContinuousCyclic duration factorduty[°C] [°F] 80% 60% 40% 20%10 50 1.2 1.3 1.6 1.8 2.020 70 1.0 1.1 1.3 1.5 1.730 85 0.9 1.0 1.2 1.3 1.540 105 0.7 0.8 0.9 1.0 1.250 120 0.5 0.6 0.7 0.8 0.9f tn 1 [rpm]f v750 1.50870 1.301150 1.151450 1.001750 0.902000 0.70Cyclic duration factor is the relationship of operating time under load « t f » to total cycle time (t f +t r ,where « t r » is the time at rest).I tftf tr100 (5)9