Note if the high alarm value is set lower than the low alarm value the relay will activate between the two i.e. activate
in the band between the two values.
5.2
Alarm relay low setpoint
Section:
AL 1
to
AL 8
Display:
Lo
Range:
Any display value or
OFF
Default Value:
OFF
Default Access Level
2
Function number
4010
to
4017
Displays and sets the low setpoint value for the designated alarm relay. Use this low setpoint function if a relay
operation is required when the display value becomes equal to or less than the low setpoint value.
To set the low alarm value press
F
and when you see a digit of the value flash use the
^
or
v
push buttons to set
the required value then press
F
to accept this selection.
The low alarm setpoint may be disabled by pressing the
^
and
v
push buttons simultaneously. When the alarm
is disabled the display will indicate
OFF
. If the relay is allocated both a low and high setpoint then the relay will
activate when the value displayed moves outside the band set by the low and high setpoints. The value at which the
relay will reset is controlled by the Hysteresis function.
If the display has annunciator leds for the relay then the annunciator will initially flash in alarm condition, if the
alarm is acknowledged by pressing the
F
button (where fitted) or has been acknowledged by a
P
button or remote
input operation the annunciator will be solidly lit until the display moves out of alarm condition.
Example:
If
Lo
under
AL 1
is set to
10
then relay 1 will activate when the display value is 10 or less.
5.3
Alarm relay hysteresis (deadband)
Section:
AL 1
to
AL 8
Display:
HYSt
Range:
0
to
65535
Default Value:
10
Default Access Level
3
Function number
4020
to
4027
Displays and sets the alarm relay hysteresis limit for the selected channel. To set a relay hysteresis value go to the
HYSt
function and use the
^
or
v
push buttons to set the value required then press
F
to accept this value. The
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