Page
29
of
44
In the above description, A1SP and A1HY denote the Alarm1 Set point and Alarm1
Hysteresis. The respective Set point and Hysteresis parameters need to be set for other Alarm outputs.
Heater break detection is enabled by setting A1FN to HBEN. A
Heater break alarm (H.bK)
alerts the user when the current measured by CT1 in CT1R is lower than HB1T-HBHY, or CT2 in CT2R is
lower than HB2T-HBHY. When the current measured by CT1 in CT1R is higher than HB1T-HBHY and CT2 in
CT2R is lower than HB2T-HBHY, the heater break alarm will be off. The Heater break alarm will be off when
both CT values are in normal range. This Alarm will function when output1 is in ON condition only.
The Heater short detection is enabled by setting A1FN to HSEN. A
Heater short alarm
(H.St)
alerts the user when the current measured by CT1 in CT1R is higher than HS1T+HSHY, or CT2 in
CT2R is higher than HS2T+HSHY. When the current measured by CT1 in CT1R is lower than HS1T+HSHY
and CT2 in CT2R is lower than HS2T+HSHY, the heater short alarm will be off. The Heater short alarm will
be off when both CT values are in normal range. . This Alarm will function when output1 is in OFF condition
only.
The Heater break and Heater short alarms will work only with Relay and SSR outputs in output1.
The Alarm outputs can be controlled by Event input1 and Event input 2 by selecting
Event Input 1 Control
Alarm Output (E1.C.o.) and Event Input 2 Control Alarm Output (E2.C.o.)
for alarm function A2FN and
A3FN .The output will be ON as long as the event input is ON. The output will goes OFF when the input is
OFF.
3.5.2
Alarm Modes
There are five types of alarm modes available for each alarm function.
1.
Normal alarm
2.
Latching alarm
3.
Holding alarm
4.
Latching/ Holding alarm
5.
Set point Holding Alarm
3.5.2.1
Normal Alarm: ALMD = NORM
When a normal alarm is selected, the alarm output is de-energized in the non-alarm condition and energized
in an alarm condition.
3.5.2.2
Latching Alarm: ALMD = LTCH
If a latching alarm is selected, once the alarm output is energized, it will remain unchanged even if the alarm
condition is cleared. The latching alarm can be reset by pressing the RESET key once the alarm condition is
removed.
3.5.2.3
Holding Alarm: ALMD = HOLD
A holding alarm prevents an alarm condition during power up. This will ignore the alarm condition at first time
after power on. Afterwards, the alarm performs the same function as normal alarm.
