User manual

Page 42
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
EL 3000 B Series
3.6 Alarms and monitoring
3.6.1 Device alarm and event handling
Important to know:
• The current drained from a switching power supply or similar sources can be much higher than
expected due to capacities on the source’s output, even if the source is current limited, and
might thus trigger the overcurrent shutdown OCP of the electronic load, in case its threshold
is adjusted too sensitively, it means too close to the related current set value
• When switching off the DC input of the electronic load while a current limited source still supplies
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 might trigger
the overvoltage shutdown OVP, in case its threshold is adjusted too sensitively, it means too
close to the related voltage set value
A device alarm incident will usually lead to DC input switch-off, the appearance of a text
message in the display and, if activated, an acoustic signal to make the user aware. The
alarm must always be acknowledged. If the alarm condition no longer exists, e.g. the de-
vice has cooled down following overheating, the alarm indication may have disappeared
already. If the condition persists, the display remains and the alarm can only be acknowl-
edged after elimination of the cause.
► How to acknowledge an alarm in the display (during manual control)
1. Once and alarm is indicated, the user can try to acknowledge and delete the alarm by pressing either button
or .
In order to acknowledge an alarm during analog remote control, see „3.5.4.3. Acknowledging device alarms“. To
acknowledge in digital remote, refer to the external documentation “Programming ModBus RTU & SCPI”.
Somedevicealarmsarecongurable:
Alarm Meaning Description Range Indication
OVP
OverVoltage
Protection
Triggers an alarm if the DC input voltage reaches the
denedthreshold.TheDCinputwillbeswitchedoff..
0 V...1.03*U
Nom
Display, analog &
digital interface
OCP
OverCurrent
Protection
Triggers an alarm if the DC input current reaches the
denedthreshold.TheDCinputwillbeswitchedoff..
0 A....1.1*I
Nom
Display, digital
interface
OPP
OverPower
Protection
Triggers an alarm if the DC input power reaches the
denedthreshold,TheDCinputwillbeswitchedoff..
0 W...1.1*P
Nom
Display, digital
interface
Thesedevicealarmscan’tbeconguredandarebasedonhardware:
Alarm Meaning Description Indication
PF Power Fail
AC supply over- or undervoltage. Triggers an alarm if the AC supply is out
ofspecicationorwhenthedeviceiscutfromsupply,forexamplewhen
switching it off with the power switch. The DC input will be switched off.
Display, analog &
digital interface
OT
OverTem-
perature
Triggers an alarm if the internal temperature exceeds a certain limit.
The DC input will be switched off.
Display, analog &
digital interface