CHAPTER 03 – POWER DRIVES EWA 7 2024 | 01 4. 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. 5. 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. 6. 24 V DC motors: Power drives EWA 10 and EWA 12 can be supplied with 24 V DC motors. A typical feature of DC motors is that current intake rise sharply as torque levels rise. 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 EN 121 Part 2. Here, it is possible to apply for consent in individual cases from the construction authorities. Our drive units have been inspected by the Fraunhofer Institut in respect of ‚usability‘ as defined in DIN 18232. Request the Fraunhofer certificate when needed. 8. A60 option: This option is suitable for use in protected outdoor environments because it has stainless steel output shafts and a special grade of thermally resistant oil for low temperatures. Separate installation conditions apply for use in outdoor environments (see chapter Service/operating instructions). 9. Optional LSC 40 control unit: Optional equipment available for the END 20 limit switch includes our power drives with the LSC 40.10. As standard, this includes the additional limit switch and can be extended to take LPR 02 analogue signals, or can be extended with the LPR 04 to take analogue and digital signals.
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