skotl
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- 9,658
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- Edinburgh, UK
My VFD and motor appear to be working fine, but I'm confused about the voltage across any 2 of the three phases.
My mutimeter tells me it's around 70V, however I expected it to be at least 230V
Of course, it could be the multimeter not reading correctly, given it's seeing PWM rather than a sine wave...
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In case anyone is interested in the why... I bought the too-cheap version of the VFD so there's no output pins on it, meaning I can't (for example) power an external fan on the motor while the motor is running. So I figured I'd put a relay across two of the phases and use that to trigger the fan.
My mutimeter tells me it's around 70V, however I expected it to be at least 230V
Of course, it could be the multimeter not reading correctly, given it's seeing PWM rather than a sine wave...
----
In case anyone is interested in the why... I bought the too-cheap version of the VFD so there's no output pins on it, meaning I can't (for example) power an external fan on the motor while the motor is running. So I figured I'd put a relay across two of the phases and use that to trigger the fan.