5 Advanced Operations
5 - 80
E5@C-T Digital Temperature Controllers User’s Manual (H185)
z Compensating Valve Positions
There are two ways to compensate valve positions: motor calibration and manual setting. Motor
calibration was previously described. For calibration with manual settings, another digital controller
is used to execute motor calibration and the automatically calculated travel time, valve completely
closed position, valve completely open position, and potentiometer specification setting are set
together in this Digital Controller. However, these settings will depend on the equipment. When
precise operation is required, execute motor calibration separately for each piece of equipment.
z Position Proportional Dead Band and Open/Close Hysteresis
When the difference between the MV and the valve opening is within the value that is set for the
Position Proportional Dead Band, opening or closing the valve will be stopped to prevent the valve
from deteriorating. The Open/Close Hysteresis parameter is used to offset the ON and OFF points
when opening and closing the valve. Refer to the following figure for details.
z PV Dead Band
When the PV enters the PV dead band, any unnecessary output is stopped to prevent the valve
from deteriorating.
z Manual MV, MV at Reset, and MV at PV Error
Refer to the following sections.
Manual PV: 5-11-1 Manual MV
MV at Reset and MV at PV Error: 5-16 Output Adjustment Functions
0
Position Proportional
Dead Band
−100%
OFF
ON
100%
MV − Valve opening
Open/Close Hysteresis
SP
PV
Unnecessary output is
stopped in this range.
PV Dead Band
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