On the engine nameplate, next to the power, there is sometimes a designation like S1 or S3. This operating mode is an important characteristic that determines how the engine can be operated. Let's look at the main modes.
Why are modes needed
The same engine heats up differently during continuous operation and during frequent starts. Modes S1–S8 standardize load conditions in order to correctly select the machine for the task.
Basic modes
| Mode | Description |
|---|---|
| S1 | Long-term - work with a constant load |
| S2 | Short-term - work, then full cooling |
| S3 | Repeated and short-term - work/pause cycles |
| S4–S5 | With frequent starts and braking |
| S6–S8 | Periodic with variable load |
Why is this important
The most common mode is S1 (long-term). But crane, elevator and machine tools operate in modes S3–S5 with frequent starts. If you put the S1 mode engine into operation with frequent starts, it will overheat and quickly fail.
- Pumps, fans - usually S1.
- Cranes, elevators - S3-S5.
- Motors with frequent reversals - S4-S5.
When selection replacement engineit is important to consider the operating mode of the mechanism. If the engine regularly overheats, the mode may be selected incorrectly - this will be revealed by diagnostics.
Do you need help selecting an engine for the operating mode in Tashkent? Elektromotors engineers will advise - leave a request.