A p p e n d i x D : P r o g r a m m i n g
D-61
AC890PX AC Drive
Functional Description
To Set-up Friction at 0 RPM
Run the drive at a very low speed. Observe the SPEED PI OUTPUT diagnostic and set the FRICTN AT 0 RPM parameter to this value. Return to
the SPEED PI OUTPUT diagnostic and verify that it is now zero, or that the noise on the diagnostic is equally positive and negative.
To Set-up Friction at Nameplate RPM
Run the drive at nameplate rpm Observe the SPEED PI OUTPUT diagnostic and set the FRN AT NMPLT RPM parameter to this value. Return to
the SPEED PI OUTPUT diagnostic and verify that it is now zero, or that the noise on the diagnostic is equally positive and negative.
After friction compensation has been set up, the RELATIVE INERTIA parameter can now be set. Relative Inertia is equal to torque (per unit) /
acceleration (revs/s
2
).
Optionally, if the system inertia is known, calculate a starting value to put into the RELATIVE INERTIA parameter. Then check the value by
accelerating the motor plus load and confirming that the PI diagnostic is around zero. Alternatively, find the Relative Inertia by trial and error:
choose a convenient ramp up time, accelerate the motor plus load observing the PI diagnostic, and find a value of Relative Inertia such that the PI
diagnostic is around zero during acceleration and deceleration.
Содержание AC890PX Series
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