Reference Manual
Power Analyzer EMM5
Rev. 11
2018-07
8
This alarm system reaches its maximum flexibility by these features:
Multi-source alarm
One single output relay, if available for alarms, can be triggered by any of the 32 alarms. More than one alarm can be
used to trigger the same relay. In this case, only one of the alarms is sufficient to activate the relay (logical OR).
As each alarm first handles the necessary delay times before sending the activation signal to the relay, different delay
times from all the alarms, which are sourcing a relay, are handled correctly!
Multi-target alarm
One alarm can trigger a configurable set of relays. This includes the activation of more than one output relay.
3.1
Alarm display
If any alarm is configured to display an alarm message, the following contents will be shown whenever the alarm is
triggered. The display message has to be quitted manually.
An alarm message offers the following information:
In the right top corner of the display, the status of all assembled relays is displayed. A dark number on bright
ground shows a relay which is deactivated, the reverse display (bright number on dark ground) shows an
activated relay.
The message “ALARM #xx” in the centre of the display shows the number of the active alarm. The number
appears instead of “xx” in this example.
The active value of the measurement which is the source of this alarm.
If more than one alarm message is active, the user can switch between them by pressing key “+”.
The right key can be used to confirm the alarm message. After confirmation, this alarm message will not reappear until
the alarm has become inactive and active again. The confirmation disables only the alarm message. If any output relays
are configured for the same alarm they are not influenced by the confirmation.
After confirmation the display shows the next active alarm or, if there are no more active alarms, resumes work at the
same point where it left before the alarm occurred. Each alarm message has to be confirmed separately.
The alarm message is displayed after the turn-on-delay time for the alarm. If the alarm condition becomes false again,
the alarm message is deactivated after expiration of the turn-off-delay time.
To enhance visibility and to make recognition of the alarm easier, the backlight of the display is toggled between full
brightness and reduced brightness, which resembles a blinking signal light.
