CNC

8055 ·T· New features Ref. 1312 Soft: V01.6x

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INDEX

VERSION V01.60

1. Auto-adjustment of axis machine parameter DERGAIN .................................................................................... 5 2. Axis machine parameter ACFGAIN (P46).......................................................................................................... 7

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VERSION V01.60

1

Auto-adjustment of axis machine parameter DERGAIN This feature 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 a.m.p. DERGAIN (P24). • Second set of gains and accelerations: a.m.p. DERGAIN2 (P61). • Third set of gains and accelerations: a.m.p. DERGAINT (P94). Until this version, this adjustment was done manually by executing a back-and-forth movement of the axis and observing the signals on the oscilloscope. With this feature, 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]. To auto-adjust the DERGAIN, proceed as follows: 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 autoadjustment 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 a.m.p.. 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 a.m.p. 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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Feature limitations The area for the back-and-forth axis movement must be long enough to reach G0. DERGAIN can only be auto-adjusted on linear and rotary axes. Auto-adjustment is not possible on switched axes, gantry, tandem axes, dead axes or spindles. The DERGAIN auto-adjustment requires properly setting parameter FFGAIN of the corresponding set. If parameter FFGAIN is not properly set, it will issue the relevant error message. • First set of gains and accelerations a.m.p. FFGAIN (P25). • Second set of gains and accelerations: a.m.p. FFGAIN2 (P62). • Third set of gains and accelerations: a.m.p. FFGAINT (P95). If the CNC has the OEM password, going into auto-adjustment will require that password.

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2

Axis machine parameter ACFGAIN (P46) A new way to handle the DERGAIN has been implemented in the digital drive system that allows a smoother and more stable adjustment using certain DERGAIN values that are a lot lower that those used when a.m.p. AFCGAIN(P46) =YES. This handling is done when a.m.p. ACFGAIN(P46)=ADVANCED and it is valid for axes and spindles. All axes of the channel, CNC or PLC, must have the same value for a.m.p. ACFGAIN(P46). In the digital system a.m.p. ACFGAIN(P46) must be set to ADVANCED. When setting ACFGAIN=ADVANCED in an analog system, it will be treated as AFGAIN=YES.

A.m.p. ACFGAIN (P46) Indicates whether or not the value of a.m.p. DERGAIN (P24) is applied onto the variations of following error (derivative gain) or onto variations of the programmed feedrate (AC-forward). Value

Meaning

NO

It is applied on variations of following error (derivative gain).

YES

It is applied on the variations of the programmed feedrate that are due to acceleration/deceleration (AC-forward).

ADVANCED

It is used in a digital drive system and provides a smoother and more stable adjustment of the machine. Default value: YES

If the value of a.m.p. ACFGAIN (P46) is changed, DERGAIN will have to be readjusted.

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