Siemens SITRANS LUT400, Руководство по эксплуатации, Страница: 483 / 601

Page 170 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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2.8.11.1. Relay 1 Logic
Use to change the behaviour of Relay 1 when assigned to an alarm.
2.8.11.2. Relay 2 Logic
Use to change the behaviour of Relay 2 when assigned to an alarm.
2.8.11.3. Relay 3 Logic
Use to change the behaviour of Relay 3 when assigned to an alarm.
2.8.12. Time To Spill
Used to predict when an overflow (spill) condition may occur. This feature
works in conjunction with the 2.8.1.High Level Alarm.
2.8.12.1. Level To Spill
Value (defined in 2.1.1.Units) representing material level at which a spill will
occur.
This value must be greater than high level alarm ON setpoint [High Level
Value ON (2.8.1.2.)].
2.8.12.2. Minutes Left To Spill
Read only. Calculated value representing minutes remaining before a spill
will occur.
Enter the level at which a spill condition will occur in
2.8.12.1.Level To Spill
.
When the High Level Alarm is tripped, the estimated time to spill is
displayed in
2.8.12.2.Minutes Left To Spill
. The estimated time is calculated
by the LUT400 based on the material level and the rate of change of the
material level. If the High Level alarm is not tripped, or the material level is
falling, then the estimated time to spill will display as zero.
2.9. Discrete Inputs
Discrete inputs are used to trigger or alter the way SITRANS LUT400 controls devices
such as pumps and alarms. Discrete inputs can be used for the following:
• as a backup level override
• allowing the device to be more flexible by interlocking control functions with
external conditions.
For more detail see
Discrete Inputs
on page 69
.
Options
NORMALLY OPEN
* NORMALLY CLOSED
Options
NORMALLY OPEN
* NORMALLY CLOSED
Options
NORMALLY OPEN
* NORMALLY CLOSED
Options
-999999.000 to 999999.000
Default: 0.000
Note: Default settings in the parameter tables are indicated with an asterisk (*)
unless explicitly stated.