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Planning guideOperating modesS3 intermittent operation without influence on the startingcurrentDefinition:Operation which is composed of a sequence of identical cycles, ofwhich each one involves an operating time with a constant load and astandstill time, whereby the starting current has no noticeable effecton the excess temperature.The power dissipation of the machine is greater than that which canbe conducted away via the coolant. With operating mode S3, thecycle duration is specified in percent and the cycle time is also specified.Example for S3 25% 10 min: The activation period is 2.5 min and thepause is 7.5 min. If no cycle duration is specified, a cycle duration of10 min. is assumed.PT CΔt PΔt RtP VtΘΘ maxtP = loadP V = electrical losses = temperature max = max. temperaturet = timeT C = cycle durationt p = operating time at constant loadt R = standstill time with no current in windings,relative activation period = t P /T C24 Wilo Water Management catalogue – 50 Hz – Drainage and sewage – Waste water transport and dewatering – Edition 2012 – Subject to change without prior notice