Installation manual
CNC 8055
CNC 8055i
CONCEPTS
7.
SOFT: V02.2X
·417·
Auto-adjustment of axis machine parameter DERGAIN
7.22 Auto-adjustment of axis machine parameter DERGAIN
The auto-adjustment of DERGAIN allows setting the axis machine parameters DERGAIN of the
three sets so the following error of the axis is close to 0.
• First set of gains and accelerations: axis parameter DERGAIN (P24).
• Second set of gains and accelerations: axis parameter DERGAIN2 (P61).
• First set of gains and accelerations: axis parameter DERGAINT (P94).
The CNC makes this adjustments automatically. For that, the CNC creates a part program that is
executed by pressing the "START" key. The movement limits of the program are taken from the
current position (JOG).
When doing the DERGAIN auto-adjustment, it saves a .log file with the auto-adjustment process
in a part program.
While executing the program, it will be possible to access the oscilloscope by keying in 71 to monitor
the adjustment as it is carried out. One must check that there is no position overshooting.
The value of the OPMODE variable when going into the DERGAIN auto-adjustment will be 120.
Going into the DERGAIN auto-adjustment
To auto-adjust the DERGAIN, go into [DIAGNOSIS / ADJUSTEMENTS / AUTOADJUSTMENT] and
follow these steps:
1. Select axis and parameter set:
First select the axis whose DERGAIN is to be adjusted and the set of gain parameters. Then,
confirm with the START softkey.
2. Generating the adjustment program:
Once the axis and the parameter set have been selected, the CNC generates the program that
will be executed to auto-adjust the DERGAIN. Configure the oscilloscope and initiate the trace
for the selected axis. Then, it remains waiting for the axis to position correctly and for
confirmation.
3. Program execution:
Once the position has been confirmed, the CNC waits for the START key to be pressed. Pressing
START runs the auto-adjustment program and the screen shows the execution status warnings.
For safety reasons, the first movement is made slowly giving the user enough time to cancel the
auto-adjustment by pressing STOP if necessary and restarted by pressing RESET.
The value of parameter DERGAIN for each axis and set is continuously updated on the auto-
adjustment screen.
When the execution is over, it displays the confirmation request for the adjusted value. Pressing
RESET returns to the initial state.
The auto-adjustment of DERGAIN can only be done when axis parameter ACFGAIN (P46) is YES
or ADVANCED.
While executing the auto-adjustment, the CNC ignores the position of the feedrate override switch.
If the value of axis parameter ACFGAIN (P46) is changed, DERGAIN will have to be readjusted.
The best results of the auto-adjustment are obtained by setting SERCOS drive parameter SERCOS
SP51=2.
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