KROHNE OPTISYS SLM 2100, Руководство пользователя, Страница: 64 / 88

5
OPERATION
64
OPTISYS SLM 2100
www.krohne.com 01/2017 - 4002737304 - MA OPTISYS SLM 2100 R04 en
5.7.8 Rake guard / trigger input
The control inputs 1 & 2 can be selected as a rake guard or an external trigger. Here a limit
switch should be used which is not part of the scope of delivery (you have to purchase this switch
from another manufacturer).
1. Rake guard Rake guard Rake guard Rake guard: In this mode the limit switch is used to interrupt the sampling process in case the
rake is passing the meter and the sensor is reeled up to avoid collisions and damage. Both con-
trol inputs can be set to rake guard via the sub menus C 3.3/3.4 Control input 1 / 2. For further
information refer to
Function tables
on page 52. For information concerning the electrical con-
nection of a limit switch refer to
Electrical connection of control inputs
on page 38.
2. External trigger
External trigger External trigger
External trigger: In this mode the limit switch is used to trigger the sampling process. When
the moving device (e.g. a rake) contacts the limit switch, the sampling process starts. Both con-
trol inputs can be set to external trigger via the sub menus C 3.3/3.4 Control input 1 / 2 and C1.8
start signal. For further information refer to
Function tables
on page 52. For information con-
cerning the electrical connection of a limit switch refer to
Electrical connection of control in-
puts
on page 38.
5.7.9 Timer / start signal
If there is no danger for the sensor or cable to be caught by moving devices (i.e. installation in
thickeners without rakes) the time based trigger mode can be selected.
• To enable the timer, the start signal has to be set to Timer. This can be done in the submenu
C1.8 start signal.
• After that the timer interval in minutes can be selected in the submenu C1.9 timer interval.
For further information refer to
Menu C, setup
on page 53.
5.7.10 Maintenance switch
The maintenance switch allows immediate access to manual operation mode without navigating
through the menu, e.g. for maintenance works. The system can be directly controlled with the
arrow keys on the keypad. In this case both current outputs are "frozen" at the last
measurement value. By deactivating the maintenance switch a new measurement cycle will be
initiated.
DANGER!
To avoid damages or destructions, use a limit switch in all applications where a rake or other
moving devices may come in contact with the sensor or cable! The manufacturer does not
assume any responsibility for damages caused by the absence or malfunction of the rake guard
limit switch.