172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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6.4 Changing Proportional Cycle Time
When time proportioning output (relay output, voltage pulse output or transistor
output) is specified at the time of ordering, Proportional cycle time and Minimum
ON/OFF time of proportional cycle can be changed.
Description of function
Proportional cycle time
Manipulated output value
turns ON and OFF in a
certain cycle (Proportional
cycle time) when the
Measured value (PV)
reaches within the
Proportional band at Time
proportioning action.
More precise control can
be achieved by shortening Proportional cycle time, however, the life of operating unit
(Relay etc.) can be shortened based on the feature of the specific controlled object
Minimum ON/OFF time of proportioning cycle
Minimum ON/OFF time of proportioning cycle can be used to compensate relay life
by acquiring the minimum OF/OFF time.
Minimum ON time of proportioning cycle:
Manipulated output does not turn ON
when the duration of the computed ON output is shorter than the Minimum ON time of
proportioning cycle being set. Manipulated output remains ON the same amount of
time as the computed ON output when the computed ON output is longer than the
Minimum ON time of proportioning cycle being set. (Minimum ON time of
proportioning cycle is available when the computed ON output exceeds 0%.)
Minimum OFF time of proportioning cycle:
Manipulated output remains OFF the
same amount of time as the Minimum OFF time set when the computed OFF output is
shorter than the Minimum OFF time being set. Manipulated output remains OFF the
same amount of time as the computed OFF output when the computed OFF output is
longer than the Minimum OFF time being set. (Minimum OFF time of proportioning
cycle is available when the computed OFF output is below 100%.)
Minimum ON/OFF time of proportioning cycle is not operative if the Proportioning
cycle is set shorter than the Minimum ON/OFF time of proportioning cycle
(Proportioning cycle
Minimum ON/OFF proportioning time).
Содержание SC-F71
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