Fuji Electric FRENIC-HVAC User Manual page 510

 PID control 2 (lower level alarm detection hysteresis range (J225)
Set the hysteresis range for the lower limit (AL) detection (J222) for alarms with physical
quantity. Please set a value larger than the lower limit alarm (AL) (J224).
- Data setting range: 0.00 to 9990.00
Upper level alarm (AH) and lower level alarm (AL) also apply to the following alarms.
Alarm
Upper limit ON when AH < PV
(absolute)
Lower limit ON when PV < AL
(absolute)
Upper limit ON when SV + AH < PV
(deviation)
Lower limit ON when PV < SV - AL
(deviation)
Upper/lower limit ON when |SV - PV| > AL
(deviation)
Upper/lower range ON when SV - AL < PV < SV
limit (deviation) + AL
Upper/lower range ON when AL < PV < AH
limit (absolute)
Upper/lower range ON when SV - AL < PV < SV
limit (deviation) + AH
Description
Select alarm output
Absolute-value
alarm
Deviation alarm
Deviation alarm
Absolute-value
alarm
Deviation alarm
6-200
How to handle the alarm:
Parameter setting
(J121, J221)
AL = 0
AH = 100%
AL = 100%
AH = 100%
AL = AH
A negative logic
signal should be
assigned to
PID-ALM.