Min. Tcoolant (°C)Tair(°C) RH = 40%RH = 50%RH = 65%RH = 80%RH = 95%-3.0-0.13.76.79.2101.54.68.411.514.2156.09.413.216.519.22010.513.817.921.424.12515.018.422.726.229.13019.423.027.431.134.13523.827.632.235.939.04028.232.136.840.844.04532.836.741.645.649.05037.142.246.350.453.955= Not allowed as standard but the coolant temperature must be 0 °C (32 °F) or above.At an air temperature of 45 °C and relative humidity of 65% the coolant temperature maynot be below +36.8 °CExample:Maximum temperature rise: Depends on heat losses and mass flow. Typically 10 °C (18°F) with nominal losses and flow.￭ Pressure limitsBase pressure: 100 … 150 kPa (recommended); 200 kPa (maximum). “Base pressure”denotes the pressure of the system compared with the atmospheric pressure when thecooling circuit is filled with coolant.Air counterpressure in the expansion tank: 40 kPaDesign pressure (PS): 600 kPaNominal pressure difference (between main in/out lines): 120 kPa with 25/75% (volume)coolant solution, 150 kPa with 50/50% (volume) coolant solution. This has to be taken intoaccount when dimensioning the liquid cooling circuit.Maximum pressure difference (between main in/out lines): 200 kPa￭ Coolant flow rate limitsThe maximum coolant flow rate for all drive equipment is 1.3 × nominal. See the technicaldata chapter for nominal values.￭ Cooling circuit materialsMaterials used in the internal cooling circuit are listed below. These are also the only materialsthat can be used in the external cooling circuit.• stainless steel AISI 316L (UNS 31603)• heavy gauge aluminum• plastic materials such as PA, PEX and PTFENote: PVC hoses are not suitable for use with antifreeze.122 Internal cooling circuit
