User manual

Page 34
ELR/ELM 5000 Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
3.6 Alarms and monitoring
3.6.1 Denition of terms
Equipment alarms (see „3.3. Alarm conditions“) such as overcurrent (OCP) primarily serve to protect the source,
which is connected to the load module, and secondarily to protect the load itself. All alarms will cause the load
device to switch off the DC input and signal the condition on the display as text, but also as readable status via
digital interface. There are following types of alarms:
Action Impact Example
Error
On reaching the condition which triggers an event of type Error the display
of the particular load module will only show a text message in the status
area of the display. An event of type Error can also occur while the DC
input is switched off and will then inhibit to switch it on as long as the error
is persistent.
Alarm
On reaching the condition which triggers an event of type Alarm the display
of the particular load module will show a text message in the status area
of the display with an additional alarm pop-up. Furthermore the DC input is
switched off. Certain device alarms can be queried via the digital interface.
An event of type Alarm can also occur while the DC input is switched off and
will then inhibit to switch it on as long as the alarm is persistent.
3.6.2 Device alarm handling
Important to know:
• The current drained from a switching power supply or similar sources can be much higher
than expected. It is due to capacities on the source’s output, and even if the source is current
limited it could trigger the overcurrent shutdown OCP or the overpower shutdown OPP on the
electronic load, in case these supervision thresholds are adjusted too sensitively
• When switching off the DC input of the electronic load while a current limited source still sup-
plies energy, the output voltage of the source will rise immediately and due to response and
settling times in effect, the output voltage can have an overshoot of unknown level which could
trigger the overvoltage shutdown OVP on the electronic load, in case this threshold is adjusted
too sensitively
• The device cannot record alarms in the order of their occurrence. The alarm listing always
show all present alarms, but unsorted
A device alarm incident will usually lead to DC input switch-off and the appearance of an alert text in the display.
Some alarms must be acknowledged, thus they are kept in the display until acknowledgement. If the alarm
condition of alarms which don’t have to be acknowledged no longer exists, e.g. the device has cooled down fol-
lowing overheating, the alarm indication will disappear.
The status area of the display will only show the alarm with the highest priority (see table below). In case of multiple
alarm occurring the same time, for example an overvoltage alarm during an overtemperature condition, they can
be listed by tapping on the status area where the alarm is indicated. This will bring up an alarm list in a pop-up.
In the MENU, there is furthermore an alarm counter for all device alarms. Every load module counts has its own
alarm counter.
► How to acknowledge an alarm in the display (during manual control)
1. While the alarm is indicated as text in the status area of the display, tap on the alarm
text. A pop-up will be displayed, listing the currently active alarms (see example to
the right).
2. Tap in the OK button. The pop-up will close and in case the alarm or alarms are not
active anymore, the alarm status in the status area will be cleared. Possibly remaining
alarms are again shown according to priority.

In order to acknowledge in digital remote control refer to the external documentation “Programming ModBus & SCPI”.