CHAPTER 03 – POWER DRIVES EWA 7 2026 | 05 4. Electric motors: We do not use standard motors. Instead, we only use motors with optimized characteristics curves, and we optimize thesefor each version and for every variant. They are designed in such a way that voltage fluctuations of approx. +/- 5 % can be contended with, even in the 60-Hz range. 5. Single-phase motors: Single-phase motors are always wired by ourselves before they leave the factory, and are supplied with a long connection cable. That means that the electric motor is switched off directly by the limit switch. This greatly simplifies assembly and is less expensive, because there is no need for a reversible contactor control system. A test run can be conducted on location using manual push-button TST 10. Having said that, single-phase motors must not be over-dimensioned. If they are operated at levels well below their nominal load rating, they are prone to heating up more, and this shortens their engagement period. The internal winding protection contact can be routed externally. 6. Special voltages: For 60 Hz we have always used special motors. We also always guarantee that the nominal load rating quoted is consistently achievable. This also applies to the other special voltage ratings. All special motors are optimized and tested before they are used on the test bench. 7. Smoke & heat extraction systems: Natural ventilation systems are often combined with smoke & heat extraction systems. With building-specific special constructions, no usability verification can be provided in accordance with DIN 12101-2. Here, it is possible to apply for consent in individual cases from the construction authorities. If necessary, we will be happy to assist you with this. 8. A60 option: This option is suitable for use in protected outdoor areas, as it has corrosion-resistant output shafts and a special low-temperature cooling oil. Separate installation conditions apply for use in outdoor environments (see chapter Service/ operating instructions).
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