West Control Solutions N6600 - Manual (Page 64)

5.3.6 Alarm Parameters
5.3.6.1 ALARM 1 VALUE {P} = C
This parameter may be modified/interrogated using a Type 2 message or a Type
3/4 message sequence. It defines the level at which Alarm 1 will go active. The
decimal point position is as for the input range.
5.3.6.2 ALARM 1 HYSTERESIS {P} = a
This parameter, which may be modified/interrogated using a Type 2 message or a
Type 3/4 message sequence, 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.
5.3.6.3 ALARM 2 VALUE {P} = E
This parameter may be modified/interrogated using a Type 2 message or a Type
3/4 message sequence. It defines the level at which Alarm 2 will go active. The
decimal point position is as for the input range.
5.3.6.4 ALARM 2 HYSTERESIS {P} = b
This parameter, which may be modified/interrogated using a Type 2 message or a
Type 3/4 message sequence, 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.
5.3.6.5 LOW HEATER BREAK ALARM VALUE {P} = g
This parameter, which may be modified/interrogated using a Type 2 message or a
Type 3/4 message sequence, 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.
5-12 O075-5
PM-0075