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Page 76
ERS COMPACT
3.7 Alarms and monitoring
3.7.1
Definition of terms
There is a clear distinction between device alarms (see
“3.4. Alarm conditions”
), such as overvoltage protection
OVP
or overheating protection, and user defined events such as
OVD
(overvoltage detection). Whilst device alarms
only switch off the DC terminal, user defined events can do more. They can also switch off the DC terminal(
Action
=
Alarm
), but can alternatively simply give an acoustic signal to make the user aware. The actions driven by
user
defined events
can be selected:
Action Impact Example
None
User defined event is disabled.
Signal
On reaching the condition which triggers the event, the action
Signal
will show a text message in the status area of the display.
Warning
On reaching the condition which triggers the event, the action
Warning
will show a text message in the status area of the display and pop up
an additional warning message which can be noticed from a bigger
distance.
Alarm
On reaching the condition which triggers the event, the action
Alarm
will show a text message in the status area of the display with an
additional alarm pop-up, and additionally emit an acoustic signal (if
activated). Furthermore the DC terminal is switched off. Most of the
device alarms are signaled on the analog interface, while all can be
queried via the digital interfaces.
3.7.2 Device alarm and event handling
Important to know:
When switching the DC input (sink mode) of the device off while a current limited source still
supplies energy, the output voltage of the source can rise immediately and due to transient
times the output voltage can have an overshoot to an unknown level which might trigger the
overvoltage alarm (OVP) or the overvoltage supervision event (OVD) of the ERSC 10000 in
case these thresholds are adjusted to sensitive levels.
A device alarm incident will usually lead to DC terminal switch-off, the appearance of a pop-up in the middle of
the display and, if activated, an acoustic signal to make the user aware. An alarm must always be acknowledged.
► How to acknowledge an alarm in the display (during manual control)
1.
If the alarm is indicated as a pop-up, tap
Acknowledge .
2.
If the alarm has already been acknowledged, but is still displayed in the status
area, then first tap the status area to display the pop-up and then
Acknowledge .
In order to acknowledge an alarm during analog remote control refer to
“3.6.4.2. Acknowledging device alarms”
.
To acknowledge in digital remote control, refer to the external documentation “Programming ModBus & SCPI”.
Some device alarms are configurable, separately for source and sink mode:
Short Long Description Range Indication
OVP
O ver V oltage
P rotection
Triggers an alarm as soon as the voltage on the DC
terminal reaches the defined threshold. The DC ter
-
minal will be switched off.
0 V...1.1*U
Nom
Display, analog &
digital interfaces
OCP
O ver C urrent
P rotection
Triggers an alarm as soon as the current in the DC ter-
minal reaches the defined threshold. The DC terminal
will be switched off.
0 A...1.1*I
Nom
Display, analog &
digital interfaces