HOME COMPANY PRODUCTS TECHNICAL INFO DOWNLOAD NEWS CONTACTS TECHNICAL INFO General characteristics Reference Standards Normalized Building Forms Overall dimensions High efficiency Electric Motors Service Protection degree classification Exploded Spare Parts ELECTRIC MOTOR SERVICE The CEI –EN 60034-1 standard and the international standard IEC 34-1 define the following ten types of service so that, based on the operation, the motor can be adequately dimensioned. S1 Continuous duty Operation at constant load of sufficient duration to allow the machine to reach thermal equilibrium. S2 Service of limited duration Operation at constant load for a determined period of time, less than that required to reach thermal equilibrium, followed by a rest period of sufficient duration to restore equality between the temperatures of the machine and that of the fluid cooling, with a tolerance of 2 ° C. S3 Periodic intermittent duty Sequence of identical operating cycles, each comprising an operating period at constant load and one at rest. In this service the cycle is such that the starting current does not significantly influence the overtemperature. (1) S4 Periodic intermittent duty with starting Sequence of identical operating cycles, each comprising a non-negligible starting time, a period of operation at constant load and a rest time. (1) S5 Intermittent periodic duty with electric braking Sequence of identical operating cycles, each comprising a non-negligible start-up time, a period of operation at constant load, a phase of rapid electric braking and a rest time. (1) S6 Periodic uninterrupted duty Sequence of identical duty cycles, each comprising a period of operation at constant load and a time of operation at no load. There is no rest period. (1) S7 Periodic uninterrupted duty with electric braking Sequence of identical operating cycles, each comprising a starting time, a period of operation at constant load and an electric braking time. There is no rest period. (1) S8 Periodic uninterrupted duty with correlated speed load variation Sequence of identical operating cycles, each comprising a phase of operation at constant load corresponding to a predetermined speed of rotation, followed by one or more periods of operation with other constant loads corresponding to different speeds of rotation (achieved for example by changing the number of poles in the case of induction motors). There is no rest period. (1) S9 Service with periodic variations of load and speed Service in which normally the load and speed vary in a non-periodic way in the range of admissible operation. This service includes frequently applied overloads which can be well above the full load values. S10 Service with distinct and constant loads Service consisting of a specific number of distinct load values (or equivalent load), maintaining each value for a period sufficient to allow the machine to reach thermal equilibrium. The minimum load during the duty cycle can be zero (no-load or idle. (1) (1) Note: Periodic service implies that thermal equilibrium is not reached during the load period. Via Aldo Moro 140 41030 Bomporto (MO) Italy VAT number 02283680367 Tel. +39 059 819268 - Fax +39 059 819265 E-mail info@ravelsrl.it Privacy Policy Update - Terms of use - Cookies - Webmaster