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4-12 l Opera
tion
Function
Control Function Descriptions (continued)
Process
Protection
Screens
SCREEN 19
SCREEN 20
SCREEN 21
This is the process protection high alarm
delay screen. It is used to set the delay
time for the process protection high tem-
perature alarm. If this time delay is
exceeded, the heater will execute a shut-
down alarm (A49). The “+/-” buttons can
be used to change the setpoint.
This is the process differential alarm set-
point screen. If the actual process protec-
tion temperature (screen 17, page 4-11)
minus the actual process temperature
(screen 4, page 4-6) exceeds this setpoint
for the length of the process differential
alarm delay (screen 21), this alarm (A50)
will trigger and the heater will shutdown.
For example if the actual process protec-
tion temperature is 450°F (232.2°C) and
the actual process temperature is 124°F
(51.1°C) for 180 seconds (default) or the
time set on Screen 21, the heater will exe-
cute a shutdown alarm (A50). The “+/-”
buttons can be used to change the setpoint.
This is the process differential alarm delay
screen. This screen is used to change the
process differential alarm delay time. The
“+/-” buttons can be used to change the
setpoint.
180
d.dL
10
H.dL
325
d.AL
* Accessed from the Process
Screens.