
B-65150E/04 4. SERVO FUNCTION DETAILS
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4.3 LEVEL-UP HRV CONTROL
(1) Overview
With standard systems of the i Series CNC (Series 15i, 16i, and 18i)(*),
the current control period can be changed from the conventional value
250 µs to 125 µs by employment of a high-speed DSP for servo control.
With a reduced current control period, the response of the current loop
increases. As the result, a high velocity loop gain and high position
loop gain can be set stably.
The position loop gain and velocity loop gain much affect the response
and rigidity of the servo system. So, increased gains can reduce cutting
figure errors, speed up positioning, and simplify servo adjustment.
Thus, level-up HRV control can improve overall servo performance.
* Level-up HRV control can be used with Series 21i as well by
specifying Series 90A0 as the digital servo function. (This function
is optional).
(2) Series and editions of applicable servo software
Series 90A0/A(01) and subsequent editions (Series 15i, 16i, 18i, and
21i, Power Mate i)
Conventional control Level-up HRV control
Example of using level-up HRV control (R100 mm, 10000 mm/min, without
quadrant protrusion compensation)
10 µm/div