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3.5.2.4
Latching / Holding Alarm: ALMD = LT.HO
A latching / holding alarm performs both holding and latching functions. The latching alarm is reset when the
RESET key is pressed after the alarm condition is removed.
3.5.2.5
Set Point Holding Alarm: ALMD = SP.HO
A set point holding alarm prevents an alarm from power up and / or changing set point. The alarm output is
de-energized whenever the set point is changed even if it is in an alarm condition. The alarm reverts to a
normal alarm once the alarm condition is removed.
3.5.3
Alarm Delay
In certain applications during startup, nuisance alarms will be generated before the process value reaches
the set point. To avoid these kinds of nuisance alarms, a time delay for alarms is available. To enable the
time delay for alarms, set the delay time using the A1DL, A2DL, A3DL, and A4DL parameters. These
parameters will avoid the nuisance alarm during the process value reaches set point.
For example, the process set point set to 100. As the process approaches 100, it may
oscillate between 103 and 97. During this time the Hi Alarm will be activated and deactivated continuously.
To avoid these kind of nuisance alarms, the alarm delay function can be used. It will generate the alarm after
the PV is in an alarm condition continuously a preconfigured period of time in the alarm delay parameters.
The alarm delay can be configured in minutes and seconds.
3.5.4
Alarm Failure Transfer
Alarm Failure transfer is activated as the unit enters failure mode. The respective Alarm will
go on if ON is set for A1FT, A2FT,A3FT or A4FT and will go off if OFF is set for A1FT,A2FT, A3FT, or A4FT.
The unit will enter failure mode if a sensor break occurs or if the A-D converter fails.
3.6
User Select Menu Configuration
Conventional controllers are designed with parameters in a fixed order.
If the user needs a friendlier menu operation to suit their application, most conventional controllers do not
offer a solution. Tempco digital controllers have the flexibility for the user to select those parameters which
are most often used, and to put these parameters in an easy access USER menu.
There are eight user friendly parameters that can be set for user select menu configuration using the SEL1-
SEL8 parameters. Please refer to the complete manual for a full list of available parameters.
When using the up-down key to select parameters, all parameters may not be available. The
number of visible parameters is dependent on the configuration of the controller.
Example:
SEL1 is set to INPT, SEL2 is set to UNIT, SEL3 is set to PB, SEL4 is set to TI, SEL5~SEL8 is set to NONE.
The USER menu sequence is displayed as below.
Содержание TEC-2400
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