YOKOGAWA UT55A - Page 126

7-19
IM 05P01C31-01EN
Input(PV,Remote,andAuxiliaryAnalog)Functions
SwitchingwithintheTemperatureRange(High-temperatureside)(ParameterPV.2C=3)
ThismethodautomaticallyswitchesPVwithintherangeofinputswitchingPVhighlimit
and low limit.
Itshouldbe
selectedincasewhereasuddenchangeinPVmustbeavoided.
PVrisingprocess
PV.HL
PV.LL
Input 2
(High-temperature side)
PV
Time
PV = Input 1 PV = Input 2During switching
Input 1
(Low-temperature side)
PVfallingprocess
PV.HL
PV.LL
Input 2
(High-temperature side)
PV
Time
PV = Input 2 PV = Input 1During switching
Input 1
(Low-temperature side)
Wheninput2≤PV.LL,PV=Input1.
WhenPV.LL<Input2<PV.HL
1
Input 1
PV
–
+
Input 2
=
PV.HL – PV.LL
Input 2 – PV.LL
Input 2 – PV.LL
PV.HL – PV.LL
• •
WhenPV.HL≤Input2,PV=Input2.
7
7.7SettingPVSwitchingMethodsofLoopControlwithPVSwitching