Azbil SDC36 - 5-14 Position Proportional Control

5-109
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
When the control output type of the model is R1 (motor drive relay output), the position proportional control is
performed. In the position proportional control, the ON/OFF control of the relays on the open and close sides is
performed so that the MV (manipulated variable) by the PID control, MANUAL operation, and output at READY
meets the opening (MFB) of the motor.

Position proportional type
Item (Bank) Display Contents Initial value User level
Position proportional type
(Setup bank)
0: MFB control and Estimated position control
1: MFB control
2:
Estimated position control (MFB disabled)
3: Estimated position control (MFB disabled)
+ Position adjustment at power ON.
0 Basic,
Standard,
High function
• On position proportional control models (with code R1 in the control output
segment of the model No.), the factory setting for
At-d
(AT derivative time
adjustment coefficient) in the Extended tuning bank is 0.00, and therefore the
derivative time is 0 seconds when AT is complete. To have the AT result affect
control, change the
At-d
setting to 1.00 and re-execute AT. For details,


Auto tuning (AT) (p.5-26).
• When the control output type is R1 (motor drive relay output), the Heat/Cool
control is not enabled.
• When the control output type is R1 (motor drive relay output), the display and
setting can be performed.
• In case of the position proportional control model, the Heat/Cool control is not
enabled.
Handling Precautions
• When [
C57
: Position proportional type] is set to [0: MFB control +
Estimated position control] or [1: MFB control], set [
C60
: Motor adjust] to
[1: Start] and execute the motor auto adjust. For details,


Motor adjust (p.5-111).
When [
C57
: Position proportional type] is set to [2: Estimated position
control (MFB disabled)] or [3: Estimated position control (MFB disabled) +
Position adjustment at power ON], set the precise value to [
C63
: Motor
full close-full open time].

Setting 0 (MFB control + Estimated position control)
When the Motor Feed Back (MFB) input is correct, the motor position is controlled
by actually measured MFB.
When using this setting, the setup (
C60
) is set at “1” to perform the motor adjust.
• If the MFB input is faulty, the motor position is controlled by the estimated MFB
value. This status is called “estimated position control status”.
For example, if the motor is rotated to the position where the feedback
potentiometer deteriorates, the MFB input is changed rapidly.
This rapid change is detected as error to estimate the correct MFB position.
Additionally, if the MFB burnout alarm occurs, the motor position is also
controlled by the estimated MFB value.
5 - 14 Position Proportional Control