Permissible starts per hour

Table P shows the allowed number of starts per hour (S0) for motors with thermal insulation class F and.
Lists the values for:
• constant torque
• quadratic torque.

The values were calculated without taking into account the moment of inertia of the driven machine.
The actual starts per hour should be calculated using the following formula:

S = S0/FI


Fi = (J motor + J load) / J motor