Hey all,
I have been troubleshooting some noise that I have on my servo encoders.
I have isolated the noise source to be the 1/4hp Automation Direct GS1
VFD that I have running my coolant pump. If the coolant pump is not
running then there is no noise on the encoders and the machine maintains
correct positioning. If I turn the coolant pump on then the encoders get
false signal that in turn changes where the machine thinks it is. This
problem showed up immediately after I retrofitted the machine this last
summer. I have just now been able to diagnose where the issue is
originating.
In attempts to improve the situation I have done the following.
Installed EMI filters on the supply lines to both the coolant and
spindle vfds.
worked on ground system to try to isolate the noise.
rerouted the coolant pump motor power cable completely away from
any other cables and completely away from the machine.
All of these things have failed to improve the noise issue.
I also tried the following to try and diagnose the issue. I disconnected
the coolant pump motor cable from the coolant pump vfd. Disconnected the
spindle motor from the spindle vfd. Connected the coolant pump to the
spindle vfd. Note that the spindle vfd is a 3.0hp Automation direct GS2
drive.
When I did this and ran the coolant pump via the spindle vfd there was
no noise on the encoders.
Does anyone have any ideas on how to get rid of this issue. I really
want to make some parts but I can't with the noise issue.
I talked to a EE buddy of mine and he mentioned running both motors
(spindle and coolant pump) off the same 3.0hp GS2 drive just to get me
going. What do you think about this? Will running two different sized
motors on the same VFD cause any issue. Right now I don't run my spindle
in reverse so I would not have any trouble with the coolant pump running
backwards.
I talked to Automation Direct and they said that the GS1 is more prone
to noise than the GS2. I am contemplating getting a 1/2hp GS2 to replace
the GS1.
So frustrated right now.
Let me know if you have any ideas.
Thanks,
Jim
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