Honeywell VRX180 user manual Program Alarms, Alarm Prompts

Programming Function Blocks and Features

4.13 Program Alarms

You can program an alarm to be triggered by any extreme input value. To program alarms, select “PROGRAM ALARMS” on the Main Program Menu. Select an alarm to program.

REFERENCE

When an alarm occurs, it produces an output pulse which can be configured to trigger a discrete output (such as a relay). Refer to Section 4.11 for instructions.

Table 4-50 describes the Alarm prompts. See Table 4-2 for additional prompts.

Table 4-50 Alarm Prompts

Prompt		Range/Selections		Definition
ON STATE		See Table 4-3 for	Enter labels for on and off states of alarm
		choices.
OFF STATE
ALARM ACTION	HIGH		Alarm when input value ≥	set point value.
		LOW	Alarm when input value ≤	set point value.
		DEV	Deviation. Alarm when input value deviates above or below compare
			point value by an amount ≥ set point value.
		HDEV	High deviation
		LDEV	Low deviation
		HRATE	High Rate. Alarm when input value increases at rate ≥ set point
			value, in units per minute. Negative rate set points are processed as
			positive values. May take up to 30 seconds to activate.
		LRATE	Low Rate. Alarm when input value decreases at rate ≥ set point
			value, in units per minute. Negative rate set points are processed as
			positive values. May take up to 30 seconds to activate.
		NONE	No alarm action.
INPUT		OFF, analog	Input source monitored by alarm.
		parameter, number
SETPOINT		OFF, analog	Point at which alarm occurs.
		parameter, number
COMPARE		OFF, analog	DEV type only. It is the point against which the input point is
POINT		parameter, number	compared. The difference between the input point and the compare
			point is the value which is measured against the alarm set point.
HYSTERESIS		OFF or number	Hysteresis affects only the point at which an alarm clears. A high
			alarm will clear when the input is less than the set point minus the
			hysteresis value. A low alarm will clear when the input is greater than
			the set point plus the hysteresis value. A deviation alarm will clear
			when the input is less than the set point minus the hysteresis value.
DELAY TIME		OFF or number	If the alarm condition clears before the delay time (in seconds)
			expires, no alarm will be indicated. Delay time must be in multiples of
			scan time.
SAMPLE HOLD		OFF, discrete	When this parameter level = 1, the alarm processing is disable and
		parameter, 0 or 1	the output is held.

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