Instructions

Page 61
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PS 9000 3U 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 sub menu “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-o󰀨. Some alarms must be acknowledged (see below),
which can only happen if the cause of the alarm isn’t 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 once.
► How to acknowledge an alarm on the analog interface (during analog remote control)
1. Switch o󰀨 the DC output by pulling pin REM-SB to the level that corresponds to “DC output o󰀨” switch it on
again. See section „3.5.4.7. Application examples“ for levels and logic.
► How to acknowledge an alarm in the alarm bu󰀨er/status (during manual control)
1. Read the error bu󰀨er (SCPI protocol) or send a specic command to acknowledge, i.e. reset alarms (Mod-
Bus RTU).
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 o󰀨.
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 o󰀨.
0 A...1.1*I
Nom
OPP
OverPower
Protection
riggers an alarm if the DC output power reaches the
dened threshold. The DC output will be switched o󰀨.
0 W...1.1*P
Nom
These device alarms can’t be congured and are based on hardware:
Alarm Meaning Description Indication
PF Power Fail
AC supply 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 o󰀨 with the power switch. The DC output will be switched o󰀨.
Display, analog
IF, digital IF
OT
OverTem-
perature
Triggers an alarm if the internal temperature reaches a certain limit. The
DC output will be switched o󰀨.