text: <s>[INST] downsides of running drive at low frequency for long periods? Summary: What are the disadvantages of running a VFD at a low frequency for an extended amount of time? [/INST] The VFD doesn't care what output frequency, it will run anywhere in it's range all day. The problem is the motor. A normal general purpose motor TEFC motor will not cool itself at low speed and burn up windings. \\n </s>