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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PSB 9000 3U Series
3.7
Alarms and monitoring
3.7.1
Definition of terms
There is a clear distinction between device alarms (see
) such as overvoltage protection
or overheating protection, and user defined events such as
OVD
(overvoltage detection). Whilst device alarms
serve to protect the device or the connected load resp. external source by initially switching off the DC terminal,
user defined events can switch off the DC terminal (Action = ALARM), but can also 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.
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. Certain device alarms are also signalled to
the analog interface or can be queried via the digital interface.
3.7.2
Device alarm and event handling
Important to know:
When switching off the DC input (in sink mode) of the device while a current limited source still
supplies energy, the output voltage of the source will rise immediately and due to response
and settle times in effect, the output voltage can have an overshoot of unknown level which
might trigger the overvoltage shutdown OVP or overvoltage supervision event OVD, in case
these thresholds are adjusted to too 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
OK.
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 with
OK.
In order to acknowledge an alarm during analog remote control, see
„3.6.4.3. Acknowledging device alarms“
. To
acknowledge in digital remote, 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 if the DC voltage reaches the defined
threshold. The DC terminal will be switched off.
0 V...1.1*U
Nom
Display, analog &
digital interface
OCP
O
ver
C
urrent
P
rotection
Triggers an alarm if the DC current reaches the defined
threshold. The DC terminal will be switched off.
0 A...1.1*I
Nom
Display, digital
interface
OPP
O
ver
P
ower
P
rotection
Triggers an alarm if the DC power reaches the defined
threshold. The DC terminal will be switched off.
0 W...1.1*P
Nom
Display, digital
interface
