ATR 421 - User manual 41
41 b. HY Burners Hysteresis: De nes hysteresis for burners command.
-999…999 [digit
7
] (degrees.tenths for temperature sensors).
> Default: 5.0.
42 t.s. o. f. Threshold Switch O Fans: De nes deviation below the
setpoint over which the fans are switched o during falling steps.
In GFS (GID) function, at this threshold burners are switched on
instead that swiched o . When exceeding command setpoint,
burners will switch o .
0…200 [digit] (degrees.tenths for temperature sensors).
> Default: 10.
43 uAL.t. Valve Time: Time for open/close servo-valve (value declared
by servo-valve manufacturer). Not allowed for feedback valves
(potentiometer).
0…300 seconds. > Default: 60.
44 fe.po. Feedback Potentiometer: Enables reading of feedback
potentiometer for motorized valves on input AI2.
Setting po.ca., when exit con guration, valve will be
completely open and then closed to allow the controller storing
feedback potentiometer limits.
di s . (Disabled). > Default.
en. (Enabled).
po.ca. (Calibration Potentiometer). Backs to en. when procedure ends.
45 AL.1 Alarm 1: Alarm 1 selection.
di s (Disabled). > Default.
a . aL. (Absolute Alarm). Absolute Alarm, referring to the process.
b . AL. (Band Alarm). Command sepoint ± band.
H. d . aL. (High Deviation Alarm). Command setpoint + deviation.
L. d . AL. (Low Deviation Alarm). Command setpoint - deviation.
a.c.s.a. (Absolute Command Setpoint Alarm). Re erring to the sepoint.
st.AL. (Start Alarm). Active in RUN.
end.A. (End Alarm). Active at cycle end.
a.o.r.s. (Auxiliary Output Related to the Step). ON/OFF at each step.
a.o.r.m. (Auxiliary Output Rising Maintenance). Auxiliary output active
for rising and holding steps.
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