text: <s>[INST] Allen-Bradley Power Flex 4 I was involved in a project that required three conveyors to run at the same speed and the engineer suggested that we connect three motors in parallel, connected to an A-B PowerFlex 4. When we tried to run the drive it acted very strange. Two of the motors were rated at .8 amps and the third was rated at 1.4 amps. If we connected only one of the motors it would run just fine. Is it possible to connect three motors to one drive? Thanks, Dan G [/INST] Yes it is possible, with the following provisions: 1. Motors all the same size ( matched impedances )2. VSD drive size = load motors + 13. Output choke used ( same rating as the drive )4. Separate overloads to each motor ( no bimetals ) 140M units are ok5. set VSD for standard v/Hz ( no auto tuning )6. Keep total cable lengths to under 100 metres I would say that the reflected waves from each of the motors is screwing up the drive. The output choke should solve this. \\n </s>