47
Operating Guide
PSI 8000 2U Series
EN
Date: 28-06-2012
About the power supply
The currently active control mode is displayed to the right of
the related actual values. For instance, the abbreviation „CV“ is
displayed next to the actual value of voltage, because it means
that „Constant voltage“ mode is active. The output values are
limited by the active control mode:
- limited by the voltage set value
(= Constant Voltage)
- limited by the power set values
(= Constant Power)
- limited by the set value of current
(= Constant Current)
- limited by the set value for internal resistance
(optional at U/I/R mode), indicated next to the
actual voltage
(= Constant Resistance)
Additionally to the state of the output an alarm, a warning or a
signal can be displayed:
Alarm
Example:
= Overtemperature
Warnings
Example:
= Overvoltage
Signals
Example:
= Overcurrent
The location from where the unit is currently controlled is dis-
played below the output state. This location is absolute, which
means that you cannot control the unit from elsewhere without
changing the location.
local
Control only possible at the unit
remote
Remote control via communication interfaces
(IF-C1, IF-R1, IF-U1 etc.)
extern
Remote control via analog interface
6.4 Switching the unit on
The unit is switched on with the mains switch. After it has been
switched on, the displays shows the device type and, if pro-
grammed, a user text.
The user text can be entered via one of the digital interface
cards using an included LabView VI. This text is intended to
identify a single unit in an complex environment of multiple units.
After the internal system has been verified and has booted, the
last state of the power supply (set values, alarm management
etc.) is restored. The return state of the output after a mains
loss (power fail error) or after the unit was switched on can be
set in the
Profile
menu.
6.5 Switching the power output on
By pressing the
button the power supply output is swit-
ched on, as long as it is not blocked by the input pin „REM-SB“
(13) of the internal analog interface or input pin „Standby“ (11)
of a equipped analog interface card IF-A1, because both have
higher priority. If one of these is preventing to switch the output
on by the button, the display will indicate the status text „
auto
ON
“, noticing the user that the output will switch on as soon as
the block from the pins is removed.
Note
In
local
state (see section 6.9), the pin REM-SB of the analog
interface (internal or external) is inoperative.
The display should then show the output condition with „
ON
“.
The
button switches the power supply output off. This
condition is displayed with „
OFF
“.
6.6 Adjusting set values
Note
Set values can be adjusted in coarse or fine steps (see table
below for step widths). Switching from coarse to fine or vice
versa is done with the two rotary knobs next to the display. The-
se also have a pushbutton feature. The last selected mode,
coarse or fine, is not saved when the device is switched off.
After powering the device, coarse mode is active by default
with firmware C3.13 or higher, else fine mode is default.
As long as „
extern
“ or „
remote
“ are not shown in the display,
the set values for voltage, current or power can be set manually.
The mode is selected in the device setup at
Accept set va-
lue.
The setting can be accessed with
->
Profile
->
General settings
->
Control panel
. See „7.4 Configuring
the control panel“ for details.
Direct setting of the set values
Using the rotary knobs directly sets the set values.
The left rotary knob adjusts the voltage. The set value of the
voltage is displayed invertedly while it is selected and adjusted.
The right rotary knob either sets the set value for the current, for
the power (at models from 1kW) or internal resistance (optional,
unlockable, with U/I/R mode chosen). The selected set value is
displayed invertedly. With the
SELECT
keys
the set value for the power, with
the set value for the internal resistance or with
the set value for the current is selected.
The maximum adjustable power can also be limited.
