Operation; Process Display And Control Panel Elements; Operating Level - Samson Trovis 6400 Mounting And Operating Instructions

Process display and control panel elements

Operation

6. Operation
This section describes how to operate the process control stations directly on the control panel.
Unfold the last page of this manual to obtain a better understanding of this description!
The process control stations are designed according to a three-level, logic operating structure:
1) OPERATING level, 2) PARAMETER level and 3) CONFIGURATION level. These levels are
described in sections 6.2. to 6.13. Depending on the selected level (mode), the visual displays
on the LCD panel and the keys assume different functions.
6.1. Process display and control panel elements
The process control station is operated via eight front-panel keys. The front panel also contains
a clear display field, which shows different variables and symbols, depending on the selected
operating level. Note that some parameters available in the PARAMETER and ADAPTATION
PARAMETER level can be a combination of several variables and symbols.
All process display and control panel elements are listed and explained on the last two pages
of this manual. Optional error messages are described in Appendix B .

6.2. OPERATING level

This is the standard operating level of the process control station (control mode). In this level,
the control station operates according to the pre-set control mode and the defined parameters.
The values of the set point (reference variable) (3) and the controlled variable (8) are
numerically indicated on the display panel. The control deviation (error) (7) and the output
variable (14) are represented as a percentage by means of bar graphs. In addition, a LED (19)
indicates whether the control station is in the AUTOMATIC or MANUAL mode. If the F key is
pressed, the numerical value of the output variable appears in the upper line of the display field
(3).
The OPERATING level allows the operator to modify the value of the internal set point (reference
variable), abort the restart condition option after a start-up procedure or a power supply failure
has occurred, or open the cascade when the controller is in the follow-up control mode. The
output variable can be modified manually when having changed over the process control
station to the MANUAL mode. These functions are described in the following sections.
All other levels can be accessed from the OPERATING level.
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