text: <s>[INST] SERIES A Drive Cat No. 22A-DP0N104 Summary: Under VoltageHi, I have a client who currently used this kind of Drive: Cat No. 22A-DP0N104 SERIES A Motor Rating: 1.5Kw/2.0HP Input: 3 Phase, 380-480V, 46-63Hz AC Voltage Range: 342-528V Amps: 5.7A Output: 3phase, 0-240Hz Ac Voltage Range: 0-460 Continuous Amps: 4.0 60 Sec Ovld Amps: 6.0 My question is: 1) If the incoming voltage is 380V, can this type of inverter run in healthy condition? 2) What will be happening if the voltage reaches below 380V? 3) What is the minimum voltages for this inverter? 4) Will the amps (input/output) increase if the voltage decrease(below 400V)? 5) What does it mean by 'AC Voltage Range: 342-528V' ? Regards, Aziz [/INST] The specs are fairly straight forward. The inverter will run normally if you are able to maintain the voltage anywhere within 342-528V. The inverter takes that 3-phase input voltage, converts it to DC voltage (approximately 1.4 times the AC voltage). It then chops the DC voltage up to simulate an AC signal out to the motor. To answer your questions: 1) This inverter can easily run on 380V. 2) The data sheet says you will get a bus-undervoltage fault if the DC bus voltage drops to around 390Vdc, equivalent to about 275Vac line input voltage. That's a pretty significant sag if the nominal voltage you expect to give it is 380. I would try to keep the input voltage above the recommended 342Vac, but you do have a good margin. 3) I'd treat 342 as the minimum, but you can go lower without causing a bus-undervoltage fault. 4) You'd likely see a larger current draw, but if you size your overcurrent protective devices according to the specifications given in the datasheet for the drive, you should not see any problems. 5) We've covered the lower end of the voltage range. If you supply this drive with any voltage that is between these two limits, the drive will operate as expected. 480Vac is a common voltage. This AC input will give a DC bus voltage of 672V. This is well within the operating range. The drive will report a bus overvoltage if it reaches 810V (about 575 Vac input). NOTE: The drive uses the DC bus for regeneration when slowing the motor and load down. If a drive is running at the higher end of the ac input range, and slowig a heavy load down, the energy put back into the DC bus could cause it to fault with a bus over-voltage. From the theme of you questions though, I don't think you'll be working at the higher range. TJ McDermott \\n </s>