Program features41Preprogrammed FaultsOvercurrentThe overcurrent trip limit for the drive is 1.65…2.17 × Imax depending on the drivetype.DC overvoltageThe DC overvoltage trip limit is 1.3 ·U1max , where U1max is the maximum value of thesupply voltage range. For:400 V units, U1max is 415 V,500 V units, U1max is 500 V,690 V units, U1max is 690 V.The actual voltage in the intermediate circuit corresponding to the supply voltage triplevel is:728 VDC for 400 V units,877 VDC for 500 V units, and1210 VDC for 690 V units.DC undervoltageThe DC undervoltage trip limit is 0.6 · U1min, where U1min is the minimum value of thesupply voltage range. For:400 V and 500 V units, U1min is 380 V690 V units, U1min is 525 V.The actual voltage in the intermediate circuit corresponding to the supply voltage triplevel is:307 VDC for 400 V and 500 V units, and425 VDC for 690 V units.Drive temperatureThe drive supervises the inverter module temperature. If the inverter moduletemperature exceeds 240 °F (115 °C), a warning is given. The temperature trip levelis 260 °F (125 °C).Enhanced drive temperature monitoring for ACS800-U2, -U4 and -U7, frame sizesR7 and R8Traditionally, drive temperature monitoring is based on the power semiconductor(IGBT) temperature measurement, which is compared with a fixed maximum IGBTtemperature limit. However, certain abnormal conditions, such as cooling fan failure,insufficient cooling air flow, or excessive ambient temperature might causeoverheating inside the converter module, which the traditional temperaturemonitoring alone does not detect. The Enhanced drive temperature monitoringimproves the protection in these situations.The function monitors the converter module temperature by checking cyclically thatthe measured IGBT temperature is not excessive considering the load current,ambient temperature, and other factors that affect the temperature rise inside theconverter module. The calculation uses an experimentally defined equation that
