Function
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VMR420_D00370_00_M_XXEN/07.2018
3.2.14 Erasable history memory
The first alarm value to occur is written to this memory.
Subsequent alarms do not overwrite this "old" value. The memory can be
erased via the menu HiS with Clr.
3.2.15 Alarm LEDs show which relay is in the alarm state
Once the menu
LEd
has been activated, the alarm LED AL1 indicates that
K1 is in the alarm state. When AL2 lights up, K2 is in the alarm state. An alarm
relay cannot switch to the alarm state unless an alarm category has been assi-
gned to it.
When the menu
LEd
is deactivated, AL1 indicates overvoltage.
For details about alarm category assignment to the respective relays refer to
the submenu "out" description on page 27.
3.2.16 Starting a device using a simulated alarm S.AL
If the menu item S.AL has been activated in the out menu, K1 resp. K2 switches
back to the alarm state once the supply voltage is applied. This alarm state is
maintained for the set duration
t
+
t
on1
. Once this time has elapsed, K1 resp.
K2 switches back to the initial position provided that no fault is detected at the
measuring input.
The following diagrams show the effect of a fault occurring during a simulated
alarm.
Faults at the measuring input and the resulting condition of the alarm relay K1
(K2) are shown as a hatched area.
