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Operating the device
2. Remote control by analogue interface
The analogue interface (short: AI) allows to remotely control
current, voltage and power (models from 1kW), always in com-
bination. It means, that it's not possible to adjust voltage by the
AI and the current with the rotary encoder on the front at the
same time, or vice versa. Because the OVP threshold can not be
adjusted via the AI, it's required to set it manually on the device
before using the remote control. Switching to preset mode with
the preset buttons shows the translated set values, that are put
into the set value pins of the AI as voltages. In order to put in
appropriate set values, the user can either use an external voltage
source or the reference output voltage on pin .
Models under 1kW output power don't require the power set
value PSEL (see section „10. Analogue interface") and thus it
must not be given.
In case it is only required to adjust voltage by external means,
the current set value (CSEL) resp. power set value (PSEL) can
be bridged to the reference voltage (VREF).
The AI can be operated with the common 0...5V or 0...10V ranges,
each corresponding to 0...100% nominal values. The desired
control voltage range is selected in the device setup (see section
„Device setup"). Following applies:
0-5V: Reference voltage = 5V, 0...5V set value voltage correspond
to 0...100% nominal value, 0...100% actual value correspond to
0...5V at the actual value outputs (CMON, VMON).
0-10V: Reference voltage = 10V, 0...10V set value voltage cor-
respond to 0...100% nominal value, 0...100% actual value cor-
respond to 0...10V at the actual value outputs (CMON, VMON).
Putting in set values that exceed the limit, for example >5V while
the 0...5V range is selected, is intercepted by clipping the con-
cerned set value to 100%.
Never input voltages higher than 12V to the set value in-
puts!
3. Remote control by digital interface card
The digital interface cards allow to set voltage, current and
power, as well as the OVP threshold and undervoltage limit UVL
by means of a PC. When changing to remote control mode, the
device keeps the last set values until they're altered. Hence it
would be possible to control only voltage by sending arbitrary set
values and the current set value would remain unaltered.
Set values given by the digital interface (except GPIB) are always
percentage and correspond at 100% (hex: 0x6400), resp. at 110%
(hex: 0x6E00) for the OVP threshold, to the nominal values of
the device.
Using GPIB, any value is given as real decimal value.
Furthermore, the digital interfaces allow to query and set a lot of
other features and values. For details refer to section „9. Digital
interface cards" and the user manual of the IF cards.
2
7. Behaviour of the device when...
7.1
Switching on by power switch
The power switch is located at the front. After switching on, the
device will show some information in the display: manufacturer's
name, address and logo, device type and firmware version. In
the device setup (see section „Device setup") there is an option
„Outp Rstr" (output restore) that determines the output condition
after the device is switched on. Default is „on". It means, that the
set values of U, I, P, the values of OVP and UVL and the output
condition are restored to what was present when the device was
switched off the last time. In case the option is set to „off", the
set values of U and I are set to 0, the set value of P to 100% and
the output is switched on after every start.
7.2
Switching off by power switch
Switching the device off by power switch is handled as mains
blackout. The device will save the last set values and output condi-
tion. After a short time, power output and fans will be switched off
and after a few seconds more, the device will be completely off.
7.3
Switching to remote control
a) Analogue interface: Pin „Remote" switches the device to
remote control by the set values pins VSEL, CSEL and PSEL
(only models from 1kW), as well as REM-SB, if not inhibited by
LOCAL mode or remote control by digital interface already being
active. The output condition and the set values which are put into
pins 1, 2 and 1 (also see section „10. Analogue interface") are
immediately set. After return from remote control, the output will
be switched off and the last remotely adjusted set values of U,
I and P are kept.
b) Digital interface: Switching to remote control by the correspon-
ding command (here: object), if not inhibited by LOCAL mode or
remote control via AI already being active, keeps output state and
set values until altered. Returning from remote control switches
the output off and the last, remotely adjusted set values of U, I P,
OVP and UVL are kept.
7.4
Overvoltage occurs
An overvoltage error can occur due to an internal defect (output
voltage rises uncontrolled) or by a too high voltage from external.
The overvoltage protection (OVP) will switch off the output and
indicate the error on the display by the status text „OVP" and on
the pin „OVP" of the analogue interface.
External voltages higher than 120% nominal voltage at the
output must be avoided, or else internal components of the
device might be destroyed!
If the cause of the overvoltage is removed, the output can be
switched on again and status text „OVP" will disappear. This is
considered as acknowledgement. In manual operation, it is done
by pushing button Output On, in analogue remote control with
pin „REM-SB" and in digital remote control by the corresponding
command. If the error is still present, the output is not switched
on.
OVP errors are recorded as alarm into the internal alarm buffer.
This buffer can be read out via the digital interface. Reading the
buffer will also acknowledge.
© 2006, Elektro-Automatik GmbH & Co. KG
Note: The status of an OV error has priority over the status of an
Irrtümer und Änderungen vorbehalten
OT error and will overwrite the status text „OT" in case both errors
occured the same time and are not acknowledged yet.
7.5
Overtemperature occurs
Ambient temperatures higher than specified must be avo-
ided!
As soon as an overtemperature (OT) error occurs by internal
overheating, the output is switched off and the status text „OT"
is indicated.
© 2009, Elektro-Automatik GmbH & Co. KG
EN
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