Gregg,
the 5 Hz is because - at least hereabouts - the VFDs are used mostly for
ventilation drives and they start with low speed and then accelerate for
noise reasons. Maybe there are also safety reasons.
Peter
Am 03.01.2018 um 00:43 schrieb Gregg Eshelman via Emc-users:
The one I have on my old Monarch lathe, to start in higher speed gears I have
to slip the clutch a bit or it'll quit with an overcurrent fault. In lower
gears I can just pull the lever.
There may be some programmable adjustment that can fix that, but it works as
it's setup now. One crazy thing was out of the box it was set to a frequency of
5Hz instead of 60. I'm not worried about any possible negative effects on the
1943 vintage 3 horsepower motor, I don't use it a lot. A newer motor with lower
rotating mass might start easier.
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