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14.6 Latch
When the setpoint is exceeded the relay outputs enters an alarm state. The latch
function of the UMU 100 will hold the relay in this state until the function is
deactivated manually. The latch function can be applied when the relay function
setpoint or window is selected.
The latch function can be selected separately for each relay output. If the
configuration is copied from one UMU 100 to another by way of the UMU-FD, the
latch function must be reconfigured.
The latch function is activates and holds the relays when the input signal rises above
or falls below the selected setpoints and the relay action has been selected as
increasing or decreasing.
The window function is selected by choosing „window“ in the menu and defining a
high and a low setpoint.
It can be selected for each relay contact whether the contact is open or closed inside
the window. This selection is made on the menu R1.cont and R2.cont.
The setpoint function is selected by choosing „setpoint“ in the menu and entering the
desired limit. The device then works as a single limit switch.
An activate
d relay means that the contact is closed if the contact function „normally
open“ is selected, and the contact is open if the contact function „normally closed“ is
selected.
The delay time for activation and deactivation can be set independently of each other
in the menus ON.DEL and OFF.DEL respectively.
If the relay function „Error“ is active, the relay will latch when a sensor error occurs
and will not be deactivated automatically when the sensor error is rectified.
The relay can only be deactivated by an operator and only when the normal
conditions for deactivation are met. If the input signal still has a value that will activate
the relay, the relay will latch again.
See the graphic depiction of the setpoint and window functions on page 70 and 71.
14.7 Manuel deactivation of the latch function
If the relay outputs are activated and there by latched, it will be indicated in the
display. The backlight flashes and the scrolling help text tells you how to deactivate
the output. Manual deactivation is carried out by way of the front buttons on the
UMU-FD. Use and to navigate in the menu and , to validate your selection.
