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© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
EN
Instruction Manual
EL 3000 A Series
Date: 05-30-2017
6. Handling
For an overview of all operating elements also see sec-
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 reached.
The triangle will indicates it.
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 dif-
ferent 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
indicates, that the control of
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
Handling the device
Both alarms switch the load input off. After removal of the
cause it can be put online again. An
overtemperature
alarm occurs on internal overheating of the device and
will temporarily switch off the DC input, until the power
stage has cooled down again.
Alarm indications remain in the display until acknowl-
edged. 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
overtempera-
ture
and this one 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 ac-
knowledged 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.
Alarm management
The signals
Overvoltage, Overtemperature
or
Power
fail
indicate the presence of an alarm situation.
A
power fail
alarm occurs if the mains input voltage is too
low. An
overvoltage
alarm
is indicated if the overvoltage
limit for the DC input has been exceeded (see „2.2 Device
