Do you know the classification of oil pump motor duty cycles? It describes the load conditions the motor is subjected to, including starting, electric braking, no-load, and power-off stop, as well as the duration and sequence of these stages. Below, Dalan Motor will explain in detail:

Work schedules are divided into the following 9 categories:

S1 continuous duty cycle: The operating time under constant load is sufficient to achieve thermal stability.

S2 Short-Time Duty: Under constant load, the motor operates for a given time, which is insufficient to reach thermal stability. Subsequently, the motor is immediately shut off for a sufficient time to allow it to cool down to within 2K of the temperature difference between the motor and the cooling medium.

S3 Intermittent Duty Cycle: Operates in a series of identical duty cycles, each cycle consisting of a period of constant load operation and a period of power-off shutdown. The starting current of each cycle in this duty cycle does not significantly affect the temperature rise.

S4 includes an intermittent cycle duty system for starting: it operates in a series of identical duty cycles, each cycle including a start-up time that has a significant impact on temperature rise, a constant load operation time, and a power-off shutdown time.

S5 includes an intermittent cycle duty system with electric braking: it operates according to a series of identical working cycles, each cycle including a start-up time, a constant load operation time, a rapid electric braking time, and a power-off stop time.

S6 Continuous Cyclic Duty System: Operates according to a series of identical working cycles, each cycle including a constant load operating time and an no-load operating time, but without power outage stop time.

S7 includes a continuous cycle duty system with electric braking: it operates in a series of identical working cycles, each cycle including a start-up time, a constant load operation time, and a rapid electric braking time, but without a power-off stop time.

S8 includes a continuous cycle duty system with variable speed and load: it operates in a series of identical working cycles, each cycle including a period of constant load operation at a predetermined speed and one or more periods of operation at other constant loads at different speeds, but without any power-off shutdown time.

S9 Non-periodic load and speed duty cycle: A non-periodic duty cycle in which load and speed vary within permissible ranges. This duty cycle includes frequent overloads, with values ​​far exceeding full load.

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Post time: Jul-25-2026