ENDRESS Power generator aggregates catalogue Page 10
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Interesting and worth knowing The drive motor Types of drive • Petrol engines should be considered when the power generator should be compact for mobile use and when only running for average periods for variable operation is expected. • Diesel engines are heavier and more sturdy and therefore better suited for longer running times. The specific fuel consumption of diesel engines is lower. Starting system There are two basic types of starting systems: • Recoil starter to crank the engine manually as opposed to an automatic wind-up rope. • Electrical starting over an ignition switch (a prerequisite being that the battery is present) When high speed and when low speed? High speed: • • • • 3000 rpm petrol or diesel engines Engines for daily use: for about 4 - 10 hours Life = service time: about 3,000 - 5,000 hours Applications: Building sites, skilled trades, road construction. Slow runners: • • • • 1500 rpm diesel engines Engines for constant operation: 24 hours Life = service time: 10,000 - 20,000 hours Applications: Current and emergency power supply Synchronous or asynchronous: a comparison of systems 10 Synchronous Asynchronous Application All ohmic and inductive consumers Only ohmic consumers without any restrictions. Inductive consumer with considerable restrictions. Starting behaviour Trouble-free starting, regardless of the consumer. Compound controlled generators with 3-fold start up current. DUPLEX generators with four times the starting current Problematic starting with the most difficult to start consumers; especially for generators without start amplification. For generators with start amplification, larger generator dimensions are needed. Load capacity The generator can handle a 100% load even with inductive consumers and it can therefore have a smaller design. With inductive consumers, the generator can only be loaded up to 1/3 (without start amplification) and 2/3 (with start amplification). Regulation Mechanical regulation IP 23 Electronic regulation IP 54 Usually unregulated, condenser Protection Class Design-dependent internal cooling IP 23 Design-dependent external cooling IP 54 Design-dependent IP 54, external cooling. Protective measures Safety-separated circuit as personal protection An FI circuit breaker is not necessary Safety-separated circuit as personal protection - A circuit breaker is not needed
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