On 9/23/22 15:10, Jon Elson wrote:
Does anybody know the XSY Inverters?
I have an XSY-AT1 Inverter (VFD) and I have it mostly programmed just
fine. To get good torque at lower speeds, I turned up parameter P72
(Torque compensation setting) and that worked great at the lowest
speeds. But, at higher speeds, the motor current was too high abnd
caused it to trip the overcurrent protection (Err 6). Maybe I did not
set the overload current setting. Is that P78 for general overload?
P78 - P85 are different overload settings, not clear which applies.
Also, P60 is listed as Multifunction input 2 / Idem (relay output)
default = 0. This is pretty cryptic. Is there a setting for this
that will switch the relay when an error condition is detected?
Thanks much in advance for any tips on this drive.
Jon
Each brand of vfd seems to have its own setup. But that lf boost is a
tricky one. I don't know
if that invertor shows you the amperage being delivered but it seems it
would be an odd one
if it didn't. What you normally do is read the motors nameplate for the
FLA, Full Load Amperage.
Then set the lf boost to not exceed that.
If you intend to use it in both directions, quickly as in rigid tapping
operations, the accel/decel
registers are generally set rediculously conservative. Those can be sped
up to almost instant,
but lcnc can still confuse the vfd into tripping.
What I do, in hal, is testup a retrigerable one shot to detect from a
leg of the encoder when the motor
has all but stopped, like 50 millisecs between pulses.
Install a mux and an xor. too. The mux is in series with the speed
signal and can switch the drive
to the PID from the set speed to zero, and should do so if the direction
from motion disagrees with the
current direction, initiating a hold so the reverse does not get to the
vfd until the motor has stopped
according to the 1-shot. That quick stop will be done by the vfd sucking
the current back out of the motor,
probably over voltaging the filters in the vfd. But when the motor has
stopped, the one shot is hooked
into the mux to restore the speed at the same time the dir reversal is
allowed to get to the vfd.
This can all happen in milliseconds. My go704 with its PMDC running on
one of your pwm-servo's,
can reverse from 3000 revs in one direction, to 3000 revs in the other
direction in 400 milliseconds.
And It does not blink the shop lights doing it, in stopping the motor,
it runs the filters up to around
165 volts while its stopping, and then uses that energy to turn the
motor back up to full speed in the other direction, without surging the
wall socket.
My 11x54 Sheldon has an elderly, probably north of 60 yo, 3 phase
century 1 horse motor in it,
driven with a 1.5 hp rated clone vfd.
At 100 spindle rpms, I have an overshoot measuring circuit rigged in its
hal file, displaying its
results in a pyvcp panel, independent of the reversal stuff described
above, and at 100 revs,
its stopped in .24 turns, doing a full reverse with a 35 lb 8" 4 jaw
mounted in around 1/2 second,
limited as much as anything by belt slippage. And with the FLA setting,
I can run at 5 hz long enough
to do the job, up to half an hour and still lay my hand on the motor,
its warm but not overheating.
The old badly worn belts used to yelp like michelin tires on hot
blacktop, but the fenner belts on
it now just swish a bit when they slip. And again, there is no shop
light blink, it does the same
as your controller, storing the energy extracted from the motor, then
using it to get back to speed
in the other direction. The overvoltage on the filters in both cases is
such a short duration that they
do not heat. Both machines, and the 7x12 in the back yard shop building
have been doing this
for in excess of 5 years, zero problems.
VFD's, properly programmed, can do amazing things. They are generally
sick dogs, straight
out of the box.
Take care & stay well Jon.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
