UPR700 Microprocessor-Based Pressure/Process Indicator 35
display.
8.6 SETTING THE ALARMS
All Alarms supplied with the Instrument can be linked to either the Primary Input or the Secondary
Input (if available), and are capable of being set as High Level Alarms or Low Level Alarms, and may
operate in either Failsafe or Direct condition.
Failsafe means that in the event of power failure to the Instrument, the Alarm will activate. Use this
feature on a shutdown alarm. Please note that in a proper operating condition in Failsafe mode, the
Normally Closed Contact are held OPEN, while the Normally Open contacts are held CLOSED. On
power failure, they are released.
On start-up, a Low Alarm may cause the unit to go into an undesired alarm condition prior to
reaching running conditions. This Alarm can be masked so that the Low Alarm will be deactivated
until it has gone above the alarm value for the first time. It will then operate as a normal low alarm.
The default values for Alarm 1 are: high alarm at 40% of full scale, linked to the primary input, 0.4
second filtering, 1% hysteresis, automatic reset, and failsafe mode. Each alarm may be set to 110%
of full scale.
The default values for Alarm 2 are: high alarm at 60% of full scale, linked to the primary input, 0.4
second filtering, 1% hysteresis, automatic reset, and failsafe mode.
The default values for Alarm 3, if supplied, are: high alarm at 80% of full scale, disabled (not linked
to any input), 0.4 second filtering, 1% hysteresis, automatic reset, and failsafe mode.
Set the Alarm parameters before setting the alarm value. If the alarm parameters have already been
set, set the alarm values as described in section 8.6.7.
8.6.1 SETTING WHICH CHANNEL ALARM WILL MONITOR
(ALARM INPUT CHANNEL LINK)
The Alarm 1 Input Channel Link defaults to the primary input. To check or change this value press
the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
3
shows in the
upper display. Press the FUNC key until
A1.LNK
shows in the lower display. Select the choice
desired by pressing the ▼ or ▲ keys. The choices are:
OFF
, (disabled), linked to the primary input
Prl.In
, or linked to the secondary input
Sec.In
. Note: if you do not have a secondary input,
Sec.In
will not appear as a choice. Press the FUNC key to lock in the value and advance to the next
parameter. Similarly, you may configure Alarm 2
(A2.LNK)
and if supplied, Alarm 3
(A3.LNK)
.
8.6.2 SETTING ALARM TYPE
A high alarm will activate when a set point is exceeded. A low alarm will activate whenever the
value falls below a set point (including startup). An inhibited low alarm must exceed the low alarm
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