West Control Solutions N6600 - Manual (Page 50)

4.4.6 Alarm Parameters
4.4.6.1 ALARM 1 VALUE - Word Parameter 13
This word parameter may be modified/interrogated. It defines the level at which
Alarm 1 will go active. The decimal point position is as for the input range.
4.4.6.2 ALARM 1 HYSTERESIS - Word Parameter 35
This word parameter applies a hysteresis band on the "safe" side of the Alarm 1
value. Thus, Alarm 1 will become active when the Alarm 1 value is exceeded;
Alarm 1 will become inactive when the process variable value is outside the
hysteresis band on the “safe” side of the Alarm 1 value. Alarm 1 Hysteresis may be
set to a value in the range 1 - 250 or 0.1 - 25.0 (as per Heater Current High Scale
Limit). The effect of the hysteresis value on the operation of the different types of
alarm is illustrated in Figure 3-3.
4.4.6.3 ALARM 2 VALUE - Word Parameter 14
This word parameter may be modified/interrogated. It defines the level at which
Alarm 2 will go active. The decimal point position is as for the input range.
4.4.6.4 ALARM 2 HYSTERESIS - Word Parameter 36
This word parameter applies a hysteresis band on the “safe” side of the Alarm 2
value. Thus, Alarm 2 will become active when the Alarm 2 value is exceeded;
Alarm 2 will become inactive when the process variable value is outside the
hysteresis band on the “safe” side of the Alarm 2 value. Alarm 2 Hysteresis may be
set to a value in the range 1 - 250 or 0.1 - 25.0 (as per Heater Current High Scale
Limit). The effect of the hysteresis value on the operation of the different types of
alarm is illustrated in Figure 3-3.
4.4.6.5 LOW HEATER BREAK ALARM VALUE - Word Parameter 31
This word parameter defines a heater current value below which the Low Heater
Break Alarm will become active. It may be adjusted in the following ranges below
the Heater Nominal Current:
If Heater Break Alarm Strategy = Percentage Mode:
0 - 100% of
Heater Nominal Current (0 = OFF - value display blank, Low Heater
Alarm forced inactive). Default value = 20% below heater nominal
current. Hysteresis is half the Low Heater Break Alarm value.
If Heater Break Alarm Strategy = Absolute Mode:
0.1A/1A
(dependent upon display resolution) - Heater Current High Scale
Limit and 0 (OFF) - value display blank, Low Heater Alarm forced
inactive. Default value = 0 (OFF). Hysteresis is 0.5A for 0.1A resolution
and 2A for 1A resolution.
4-14 O075-4
PM-0075