User Manual

Page 43
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PS 9000 1U Series
3.6 Alarms and monitoring
3.6.1 Denition of terms
Device alarms (see „3.3. Alarm conditions“)aredenedasconditionslikeovervoltageorovertemperature,signalled
in any form to the user of the device in order to take notice.
Those alarms are always indicated in the front display as readable abbreviated text, as well as status readable via
digital interface when controlling or just monitoring remotely and, if activated, emitted as audible signal (buzzer).
Furthermore, the most important alarms are also signalled by output pins on the analog interface.
There is furthermore an alarm history available in the submenu “Overview”. It counts alarms that occurred since
the last time the unit was switched on, for statistics and later check.
3.6.2 Device alarm handling
A device alarm incident will usually lead to DC output switch-off. Some alarms must be acknowledged (see below),
which can only happen if the cause of the alarm is not persistent anymore. Other alarms acknowledge themselves
if the cause has vanished, like the OT and the PF alarm.
► How to acknowledge an alarm in the display (during manual control)
1. Push button or once.
► How to acknowledge an alarm on the analog interface (during analog remote control)
1. Switch off the DC output by pulling pin REM-SB to the level that corresponds to “DC output off”, then switch
it on again. See section „3.5.4.6. Application examples“ for levels and logic.
► How to acknowledge an alarm in the alarm buffer/status (during digital control)
1. Readtheerrorbuffer(SCPIprotocol)orsendaspeciccommandtoacknowledge,i.e.resetalarms(ModBus).
Somedevicealarmsarecongurablebyadjustingathreshold:
Alarm Meaning Description Range Indication
OVP
OverVoltage
Protection
Triggers an alarm if the DC output voltage reaches the
denedthreshold.Thiscanbecausedbythedevice
being faulty or by an external source. The DC output
will be switched off.
0V...1.1*U
Nom
Display, analog
IF, digital IF
OCP
OverCurrent
Protection
Triggers an alarm if the DC output current reaches the
denedthreshold.TheDCoutputwillbeswitchedoff.
0A...1.1*I
Nom
Display, digital
IF
OPP
OverPower
Protection
Triggers an alarm if the DC output power reaches the
denedthreshold.TheDCoutputwillbeswitchedoff.
0W...1.1*P
Nom
Display, digital
IF
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 output will be switched off.
Display, digital
IF
OT
OverTem-
perature
Triggers an alarm if the internal temperature reaches a certain limit. The
DC output will be switched off.
Display, analog
IF, digital IF