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Advance Angle Compensation Function Processing
Note 1. Resolver angle detection and Resolver speed detection are performed in different cycles.
Note 2. The “Resolver angle” is the angle after origin compensation (or origin shift) has been performed for
the electrical absolute angle of the Resolver.
Detects Resolver angle
Adds the advance angle amount
to the Resolver angle.
Calculates and displays the
present angle
Detects Resolver speed
Calculates advance angle
amount
Re-writes advance angle
amount
Calculates advance angle amount
from the advance angle compensation
values 1 and 2.
The advance angle amount is
re-written when the present angle
equals the advance angle
compensation value 3 parameter.
S For example, assume that the advance angle compensation value 3 is set to “30” and the result of
the advance angle calculation has changed from “0” to “1.” This calculation result is reflected, not
immediately but when the present angle reaches “30.” In other words, when the present angle “30”
is detected, the present angle is compensated to “31.” When this compensation is performed,
therefore, present angle “30” is skipped. (An operation example is shown below.)
2725 26 28 29 30 31Resolver angle 32 33 34 35 36
01Advance angle amount
2725 26 28 29 31 32Present angle 33 34 35 36 37
S The processing is the same when the advance angle amount is to be reduced. For example, if the
advance angle amount changes from “10” to “5,” the Resolver angle, advance angle amount, and
present angles will be as shown below. In this instance, the present angles “25” through “29” are
repeated.
1715 16 18 19 20 21Resolver angle 22 23 24 25 26
10 5Advance angle amount
2725 26 28 29 25 26Present angle 27 28 29 30 31
In this way, the present angles do not continue in numerical order from the angle where the present
angle and the advance angle compensation value 3 coincide. The following points must be taken
into consideration, therefore, when using the advance angle compensation function.
S Set advance angle compensation value 3 in a section where the cam output does not change. (Set
in the middle of a section where ON or OFF status continues for a long time.)
S As much as possible, do not operate the machinery while the advance angle amount is changing
(accelerating or decelerating.) (Start real operation after the speed has stabilized.)
S If the machinery must be operated during acceleration or deceleration, change the system set-
tings to minimize the change in advance angle amounts as much as possible. (Consider gentle
acceleration or deceleration and minimizing the change in advance angle amount or speeding up
the peripheral devices (or slowing down the drive axle side) and reducing the size of the com-
pensation amount itself.)
Operation Chapter 3
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