Rexnord-Stephan S4 Catalogue

04-2007 3P0200-XX7. Technical Appendix7.3.14 TolerancesThe following tolerances apply to the performance specifications of electrical machines to DIN EN 60034:l Efficiency 0 - 0.15 (1 - 0) for rated outputs ≤ 50 kW- 0.10 (1 - 0) for rated outputs > 50 kWl Power factor cos n: - (1-cos n) / 6l Slip: ± 20 % for rated outputs > 1 kW± 30 % for rated outputs 1 kWl Starting current: + 20%l Starting torque: - 15% ... + 25%l Mass moment of inertia: ± 10%l Sound pressure level: + 3 dB(A)7.3.15 Calculation of maximum permissible operating frequency of motors: ZThe maximum permissible operating frequency of a brake motor is dependent upon:lllllthe size of the accelerated mass moments of inertiathe relative operating timethe relative load, i.e. the ratio of actual output power andrated output of the motorload torque during accelerationThe no-load operating frequency listed in the tables can be converted to the actual application using the followingformula:Z = Z o x F z x F b x F mF zF bF mZ oJEJ zusT aTAEDDependent upon additional mass moment of inertiadependent upon output and operating timedependent upon load torqueno-load operating frequency at 60% operating timemass moment of inertia of the motormass moment of inertia of driven machine referenced to the motor shaftload torqueacceleration torque (motor)operating timewhereby P = P a / P mP a :P m :power demand after completed accelerationrated motor outputT28