Program Alarms; Table 4-50 Alarm Prompts - Honeywell VRX180 User Manual

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.
Prompt Range/Selections
ON STATE See Table 4-3 for
choices.
OFF STATE
ALARM ACTION HIGH
LOW
DEV
HDEV
LDEV
HRATE
LRATE
NONE
INPUT OFF, analog
parameter, number
SETPOINT OFF, analog
parameter, number
COMPARE OFF, analog
POINT parameter, number
HYSTERESIS OFF or number
DELAY TIME OFF or number
SAMPLE HOLD OFF, discrete
parameter, 0 or 1

Table 4-50 Alarm Prompts

Enter labels for on and off states of alarm
Alarm when input value
Alarm when input value
Deviation. Alarm when input value deviates above or below compare
point value by an amount
High deviation
Low deviation
High Rate. Alarm when input value increases at rate
value, in units per minute. Negative rate set points are processed as
positive values. May take up to 30 seconds to activate.
Low Rate. Alarm when input value decreases at rate
value, in units per minute. Negative rate set points are processed as
positive values. May take up to 30 seconds to activate.
No alarm action.
Input source monitored by alarm.
Point at which alarm occurs.
DEV type only. It is the point against which the input point is
compared. The difference between the input point and the compare
point is the value which is measured against the alarm set point.
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.
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.
When this parameter level = 1, the alarm processing is disable and
the output is held.
Video Recorder – User Manual
Programming Function Blocks and Features
Definition
set point value.
set point value.
set point value.
set point
set point
143