34
IM 01B08B02-01EN
Operating the Tuning Displays
Description
The PH2, PL2, HH2, LL2, DL2, VL2, and VT2 parameters are used in the loop 2 in the cascade mode, selector mode, and pro-
grammable mode.
If the high limit alarm setpoint for PV and the high-high limit alarm setpoint for PV are set to the maximum values, no alarm is
generated.
If the low limit alarm setpoint for PV and the low-low limit alarm setpoint for PV are set to the minimum values, no alarm is gener-
ated.
Alarm hysteresis HYS1 acts on PH1, PL1, HH1, LL1, and DL1 collectively, while alarm hysteresis HYS2 acts on PH2, PL2, HH2,
LL2, and DL2 collectively.
The following figure shows an example of actions of the high limit alarm for PV, high-high limit alarm for PV, low limit alarm for PV,
low-low limit alarm for PV, and alarm hystereses.
PV
High-high limit alarm output for PV
High limit alarm output for PV
High-high limit alarm setpoint for PV
High limit alarm setpoint for PV
Low limit alarm setpoint for PV
Low-low limit alarm setpoint for PV
Low limit alarm output for PV
Low-low limit alarm output for PV
For an example in the figure above, the contact type is such that the contact
opens if an event occurs (factory default).
Alarm hysteresis (HYS)
Alarm hysteresis (HYS)
Alarm hysteresis (HYS)
Alarm hysteresis (HYS)
Closed Open
Closed Open
Closed Open
Closed
Open Closed
The following figure shows an example of actions of deviation alarms and alarm hysteresis.
PV
Closed ClosedOpenClosed Open
Setpoint (SV)
Deviation alarm setpoint
Deviation alarm setpoint
Alarm hysteresis (HYS)
For an example in the figure above, the contact type is such that the contact opens
if an event occurs (factory default).
Alarm hysteresis (HYS)
The value of alarm hysteresis is common to the high limit alarm for PV, high-high limit alarm for PV, low limit alarm for PV, low-low
limit alarm for PV, and the deviation alarm.
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