gefran 2850T, Инструкция по использованию и установке, Страница: 88 / 166

86
4. CONFIGURATION
80703B_MHW_2850T/3850T_02-2019_ENG
The Alarm section lets you set PID alarm parameters. To
open the alarm page, double-click the
Alarms button and
select Alarms from the drop-down menu. The Alarm page
can be opened from other pages in the Alarms section by
touching key 1 on the left.
The number of the PID to be set is displayed at the top of
the screen and can be changed using the
- and + keys.
The number of the alarm to be set is displayed at the right
of the screen and can be changed using the
- and + keys.
Turn the alarm on and off with the EN button. The key turns
green when the alarm is enabled.
The value can be entered with the virtual keyboard by
touching some parameters.
The available parameters are:
• ALARM : alarm threshold, that can be relative or abso-
lute.
• REF
: reference to be compared with the alarm thresh-
old.
• HYST : alarm hysteresis.
• DELAY : alarm activation delay, expressed in minutes
and seconds.
• AL
: lets you select one of the user alarms for a certain
PID alarm. This way the alarm is also associated with a
string.
• OUT : lets you select a digital variable, excluding digital
inputs, that will be turned on (ON) when an alarm is
triggered and turned on (OFF) without one.
• Status : LED that displays alarm status (red = alarm,
grey = no alarm).
For variable names, the list can be scrolled using the but-
tons on the right of the display:
and move the list by 3 variables;
and move the list by 10 variables;
You can also jump directly to specific points in the list by
touching the alphabetic directory keys. When the key is
marked with two characters or digits (for example, A0, B1,
etc.) quickly touch the key twice to jump to the second
character. The
sp
button means “space”.
Once you see the variable, touch it to select it.
The
CLEAR button deletes any variable in the field and
closes the window; the field becomes empty.
Touching the X at the top right corner closes the window
without confirming any selections.
Touch the keys on the right to turn the function or operating
mode on or off (the green light on means it is enabled).
The settable modes are:
• On EN / On DIS : The parameter sets alarm behaviour
upon turning on the instrument. If the parameter is “On
EN” , if the process variable exceeds the limits of the
alarm threshold, the alarm will go off when the con-
troller is turned on. If the parameter is “On DIS”, the
’alarm will not go off until the alarm threshold value has
been intercepted at least once since the controller was
turned on.
• Direct/Reverse
: with Direct, a reference higher than
the alarm threshold triggers the alarm, with Reverse,
the alarm is triggered when the reference is lower than
the alarm threshold.
• Absolute/Relative : with Absolute, the reference is
compared to a constant alarm threshold. With Relative,
the reference is compared to a dynamic THRESHOLD
=SP+Offset set.
• Normal / Symmetric : if Symmetrical is selected, there
will be a double alarm symmetrical to the threshold
itself.
Power displays the percent power calculated at that time
by the PID and if used for heating (red LED) or cooling (blue
LED).
Alarms function and are independent of the functioning or
enabling of the PID. They may therefore be used even if the
PIDs are off and with variables unrelated to process control.
4.15.4.8. PID HB alarm configuration
The HB alarm section lets you set HB alarm parameters. To
open the alarm page, double-click the
Alarms button and
select
HB
from the drop-down menu. The HB page can be
opened from other pages in the Alarms section by touching
key 2 on the left.
The number of the PID to be set is displayed at the top of
the screen and can be changed using the
-
and
+
keys.
The value can be entered with the virtual keyboard by
touching some parameters.
Note
: One (single phase load), two (three-phase load) or no
CT (current transformer) can be associated with each PID
based on needs and for all available CT (the total number of
CT is equal to the number of F-MIX modules × 2).
The available parameters are:
• TA 1 number : number of the first CT associated with
the PID.
• TA 2 number : number of the second CT associated
with the PID.