YOKOGAWA UP35A - Page 237

11-8
IM 05P02D41-01EN
FeedbackInputHighLimitAlarmandFeedbackInputLowLimitAlarm
These alarms can be used only for Position proportional type..
These alarms monitor the feedback input (resistance or current) value.
The setting range for these alarms is 0.0 to 100.0%.
However, the setting range varies depending on whether the feedback input is a current
value(4to20mA)orresistancevalue(100Ωto2.5kΩ).
Current value: 4 mA corresponds to 0.0%, and 20 mA to 100.0%.
 Resistancevalue(e.g.,1kΩ):Theresistancevaluewhenthevalveisfullyclosedafter
thevalvepositionadjustmentcorrespondsto0.0%,andtheresistancevaluewhenthe
valveisfullyopenedcorrespondsto100.0%.0Ωdoesnotcorrespondto0.0%,and1
kΩdoesnotcorrespondto100.0%.
Feedback input
ON OFF
ON
Contact type in the figure above: Energized when an event occurs (factory default).
Alarm hysteresis
Alarm hysteresis
OFF
Time
Feedback input
high limit
alarm setpoint
Feedback input
low limit
alarm setpoint
Feedback input
high limit
alarm output
Feedback input
low limit
alarm output
PVVelocityAlarm
PV
VT VT VT VT VT VT
PV velocity
alarm output
Time
An alarm occurs if the velocity
exceeds this inclination.
OFF OFF OFFON ON
Velocity alarm
time setpoint
VT1 to VT2
Velocity alarm
setpoint
Velocity alarm
setpoint
Velocity alarm
time setpoint
VT1 to VT2
Exceeds the velocity
Contact type in the figure above: Energized when an event occurs (factory default).
Monitors the variation of the measured value for 2 points by the time
interval set in VT.
The PV velocity alarm function does not work the alarm hysteresis, the stand-by action
and the alarm delay timer functions.
11.1SettingAlarmType