Yamatake SDC35, User Manual

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5-108
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
• In the estimated position control status, an error occurs between the actual motor
opening and estimated MFB value.
Therefore, if the output (MV)
≤
0.0%, the relay on the close side is always turned
ON. If the output (MV)
≥
100.0%, the relay on the open side is always turned
ON.
According to the above control, the motor is put in the fully closed status or fully
opened status to correct the error.
However, the error is not corrected if the MV value is limited to a range of 0.1 to
99.9% by the output limiter or if the MV value does not become 0.0% or less or
100% or more according to the control status.
• The following may be the cause if the estimated position control is activated
easily.
• The motor opening is adjusted incorrectly.
• The feedback potentiometer deteriorates or the resolution is insufficient.
• The MFB wiring is faulty.
●
Setting 1 (MFB control)
The motor is controlled by actually measured MFB. If the MFB burnout alarm
(AL07) occurs, the MFB is changed to “150%” so that the relay on the close side
is always turned ON. When using this setting, the setup (C60) is set at “1” to
perform the motor auto adjust.
●
Setting 2 (Estimated position control)
• The motor is always controlled in the estimated position control status.
Regardless of the presence of the MFB wiring, the motor position is controlled
by the estimated MFB value.
• When using this setting, [C63: Motor full close-full open time] must be input
correctly.
• The MFB burnout alarm does not occur.
• The error between the actual motor opening and estimated MFB value is
corrected by forcibly moving the motor continuously in the close or open
direction when the MV is 0.0% or 100%.
●
Setting 3 (Estimated position c Position adjustment at power ON)
When the power is turned ON, the relay on the close side is kept turned ON for a
period of time set in [C63: Motor full close-full open time] to make “0%” of the
estimated MFB matched with the motor opening. Subsequent operation is the
same as that described for setting 2 (Estimated position control).
When using Setting 3, set the precise value to [C63: Motor full close–full open
time].