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Installation manual
CNC 8055
CNC 8055i
7.
CONCEPTS
SOFT: V02.2X
Main and second spindle
This gain is only to be used when operating with acceleration/deceleration control.
For example, if spindle parameter FFGAIN (P25) has been set to "80", the spindle velocity command
will be:
• 80% of it will depend on the programmed feedrate (feed-forward gain)
• 20% of it will depend on the spindle following error (proportional gain)
Setting the Feed-Forward gain involves a critical adjustment of spindle parameter MAXVOLT (P37).
1. Set the spindle at maximum speed and at 10%.
2. Measure the actual analog command at the drive.
3. Set parameter MAXVOLT (P37) to a value 10 times the measured value.
For example, If the measured command voltage was 0.945 V, then set this parameter to 9.45
V, in other words: P37=9450.
Next, set spindle parameter FFGAIN (P25) to the desired value.
Derivative (AC-forward) gain setting
With the derivative gain, it is possible to reduce the following error during the acc./dec. stages.
Its value is given by spindle parameter DERGAIN (P24).
When this additional velocity command is due to fluctuations of following error, "ACFGAIN" (P46)
= NO, it is called "derivative gain".
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