Thermo Scientific LevelPRO, User Manual

Page: 69 / 128

Operation
Physical Inputs & Outputs
Figure 4-15.
Relay Outputs
1. Select an operational mode from the Hold/Live dropdown.
a.
In Live mode, the relay output will be controlled by a mode/fault alarm,
process alarm or totalizer. If the relay has not been assigned to an alarm, it will
be set to the Default Relay Value.
b. In Hold mode, the relay will be held on or off based on the setting of the
Hold Value field.
2. If Hold mode is selected, indicate a hold value by using the Hold Value
dropdown.
•
Hold ON – The coil is energized.
•
Hold OFF – The coil is de-energized. This is the default value.
3. Select either Process Alarm or Totalizers from the Process Function dropdown.
a.
If Process Alarm is selected, the Alarm Action dropdown allows the user to
designate what happens when an alarm associated with the selected relay
output is triggered. In this mode, the relays can be configured to output a
signal based on either mode/fault or process alarm conditions.

Do Nothing – Any alarm assigned to the relay has no effect on the relay’s
state.

Hold Relay ON – When the alarm assigned to the relay is active, the relay
will be energized. When the alarm assigned to the relay is inactive, the
relay will return to a de-energized state.

Hold Relay OFF – When the alarm assigned to the relay is active, the
relay will be de-energized. When the alarm assigned to the relay is
inactive, the relay will return to an energized state.
Thermo Scientific LevelPRO User Manual
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