Handling The Device; Handling; The Display; Overvoltage - Elektro-Automatik EL 9000 A Bedienungsanleitung

Handling the device

6.

Handling

For an overview of all operating elements also see sec-
tion 3.1.
6.1 The display
This is an overview of the two line display and its layout.
The left side always shows actual values while the load
input is switched on:
Figure 3
The indicator for the regulation mode(a triangle) appears
next to the actual value, which is related to currently
active regulation mode of the load. This can differ from
the chosen regulation mode if a nominal value has been
exceeded. The current or power limitation have priority
over the voltage or resistance limitation here. That means,
that the load will change into constant current limitation as
soon as the nominal current value has been exceeded.
The triangle indicates this.
In standby (load input off), the status Standby is displayed
and only the actual value of voltage is shown:
Figure 4
Various texts in the right half of the display indicate diffe-
rent operation modes or errors:
Figure 5
This text appears if the load was set to remote control
operation (Remote mode) via the optional interface card.
This is possible in the modes Level A, B and A/B.
Figure 6
The text External mode
the load was switched to the analogue interface. The
set values can not be adjusted at the device anymore in
this mode. For detailed information see section „8. The
analogue interface".
Instruction Manual
EL 9000 A Series
indicates, that the control of
Alarm management
The signals

Overvoltage

presence of an error.
A power fail alarm occurs if the mains input voltage is
too low. An overvoltage alarm is indicated if the overvol-
tage limit for the DC input has been exceeded (see „2.2.
Device specific data" for the limit). Both alarms switch
the load input off. After removal of the cause it can be
put online again.
Alarm indications remain in the display until acknow-
ledged. The purpose is to inform the user that an alarm
is either active or already gone. Example:
Figure 7
An active alarm has priority over a gone alarm. If two alarms
are active, then overvoltage has priority over power fail
in the display.
Only alarms with status „(gone)" can be acknowledged.
Acknowledging is either done with the pushbutton „Input
on/off" or by reading the internal alarm buffer via a digital
interface card. The buffer is cleared after reading, if no
alarm is currently active.
In analogue remote control, alarms also have to be ack-
nowledged by pulling pin REM-SB to low, i.e. switching
the input off. If the input is already off while the alarm
occurs, it will automatically acknowledge an alarm with
status „(gone)".
Note: with interface card GPIB plugged, the internal alarm
buffer is continuously read by the card and will thus au-
tomatically acknowledge gone errors, so these are not
displayed anymore. Via SCPI command, errors with status
„(gone)" are not returned, only active errors. When using
an Ethernet card, alarms like these are not returned at all.
Date: 11-16-2011
EN
or Power fail indicate the
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