Alarms And Monitoring; Definition Of Terms; Device Alarm Handling - Elektro-Automatik PS 9000 1U Betriebsanleitung

3.6

Alarms and monitoring

3.6.1

Definition of terms

Device alarms (see „3.3. Alarm conditions") are defined 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
► 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 „3.5.4.7. 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 specific command to acknowledge, i.e. reset alarms (ModBus).
Some device alarms are configurable by adjusting a threshold:
Alarm Meaning Description
Triggers an alarm if the DC output voltage reaches the
OverVoltage
defined threshold. This can be caused by the device
OVP
Protection being faulty or by an external source. The DC output
will be switched off.
OverCurrent Triggers an alarm if the DC output current reaches the
OCP
Protection defined threshold. The DC output will be switched off.
OverPower Triggers an alarm if the DC output power reaches the
OPP
Protection defined threshold. The DC output will be switched off.
These device alarms can't be configured and are based on hardware:
Alarm Meaning Description
AC supply over- or undervoltage. Triggers an alarm if the AC supply is out
PF Power Fail
of specification 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.
OverTem- Triggers an alarm if the internal temperature reaches a certain limit. The
OT
perature DC output will be switched off.
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Germany
or once.
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
PS 9000 1U Series
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Nom
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Indication
Display, analog
IF, digital IF
Display, digital
IF
Display, digital
IF
Indication
Display, digital
IF
Display, analog
IF, digital IF
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