User manual

20 GMC-I Messtechnik GmbH
4 Manual Operation and Device Functions
4.1 Menu Structure
After the power-up sequence has been completed, the device is
switched to the basic operating mode by means of which the
device’s basic functions can be executed, such as:
• Select desired output voltage Uset
• Select desired output current Iset
• Adjust allowable working range with soft-limits Ulim and Ilim
• Adjust overvoltage protection and overcurrent shutdown
Additional setup menus can be accessed with the function key.
These include:
• SEt (setup) extended Setup functions
• AnIF (analog interface) Analog interface settings
• SEq (sequence function) Sequence function settings
• bUS (computer interface) Interface configuration settings
• CAL (calibration menu) Balance the KONSTANTER
After selecting the desired setup menu with the function key, the
respective menu level appears at the display.
The function and arrow keys are used to scroll through the
respective menu levels and select the desired settings.
The <CE/LOCAL> key can be used to shift back up one level at a
time, until the basic operating menu once again appears.
4.2 Setting Output Voltage and Output Current
There are two ways to set output voltage and output current:
• Direct selection
Changes become immediately effective when this method is utilized,
assuming the output is active.
• Pre-selected settings
Output voltage or current is preset with the scroll keys to the
desired value. The selected value is activated at the output
after acknowledging with the <ENTER> key.
4.2.1 Direct Selection (rotary knobs and scroll keys)
The operating concept allows for direct selection of output
voltage and/or output current with the rotary knobs, with
immediate activation of the new values at the output.
In the default configuration, current output values appear at the
display with voltage at the left and current at the right-hand side.
This is indicated by means of the two LEDs above the display. If
the output is active (indicated by illumination of the red LED above
the <OUTPUT> key), the LEDs in the diagram indicate the control
state. Depending upon the selected output quantities and the
load situation, either output voltage or output current is regulated.
CV (constant voltage) indicates voltage regulation, and CC
(constant current) indicates current regulation.
If the working point is not within the allowable control range, the
power LED lights up.
The display can be switched to a representation of the
corresponding setpoint by slightly turning one of the rotary knobs
(Uset or Iset). This change is indicated by the respective LED
above the display. The blinking decimal place indicates the
resolution with which adjustment will take place. Resolution can
be adjusted with the <SELECT> key.
The setting can then be changed to the desired value with the
rotary knob.
As soon as the selected setpoints have been activated, they can
also be adjusted with the scroll keys, in which case resolution can
also be pre-selected.
 Initializing the Procedure
☞ Slightly turn (1) the Uset knob [7].
! The display is switched from Uout (measured voltage value)
to Uset (voltage setpoint). The decimal place for the selected
setting resolution blinks.
! The green Uout/V LED [6] goes out and the yellow Uset/V LED
[6] lights up. Continuous illumination of the Uset/V LED
indicates that values are activated immediately during
adjustment.
 Selecting Resolution
! 3 step widths are possible: 0.01 V, 0.1 V or 1 V.
! The blinking decimal place [5] indicates which step width will
be used for setpoint adjustment.
☞ Repeatedly press the <SELECT> key [13] until the desired
decimal place blinks at the display.
 Executing the Procedure
Values become immediately active during adjustment.
☞ Adjustment (2) with the Uset rotary knob [7]:
Clockwise rotation  Increases the value
Counterclockwise rotation  Decreases the value
All intermediate values are run through semi-linearly and are
read out to the output (assuming it is active).
Figure 4.2.1 a Continuous Adjustment of Uset
☞ Adjust (3) with the <> key or the <> key [11]
<> (increment)  Increases the value
<> (decrement)  Decreases the value
! Each time the key is pressed, output voltage is changed
by an amount which corresponds to the value selected
with the resolution setting function.
! Pressing and holding the respective key results in rapid
scrolling, regardless of the step width.
Attention! Uset may not be set to a value which exceeds Ulim!
Uset – Output Voltage
• Adjustment with the Uset rotary knob [7] is not enabled until 0.4
seconds after the digital display [5] has been switched to the
respective function. This delay time prevents inadvertent
changes to Uset during selection of the Uset display. The rotary
knob must be adjusted after this time period has elapsed in
order to change the Uset setting.
• After delay time has elapsed, output voltage is adjusted directly
as the knob is rotated, if the output is active. The currently
active value always appears at the display [5].
• If no adjustment is made for a period of 10 seconds, the
display automatically returns to the measured voltage value
Uout. The display can be immediately switched to the Uout
value by pressing the <CE/LOCAL> key [16].
• There are two ways to adjust Uset manually:
– Adjustment with immediate activation of the new value:
Adjustment of the setpoint has an immediate effect on
load output quantities.
– Setpoint adjustment:
Adjustment of the setpoint does not effect load output
quantities until after enabling.
Uset / V
Uout
t
(1)
(2)
(3)