User Manual

19
Instruction manual
PS 2000 B Triple Series
EN
Date: 11-21-2011
4.2 Pushbuttons
4.2.1 Pushbuttons Preset
These button are used to switch to preset mode and for
activation/deactivation of the LOCK mode, as long as the
unit is not in remote control.
Push Display Mode
1x Display of U/I set values
2x Display of OVP/OCP set
values
3x Activation/Deactivation of
LOCK mode (also see 4.5)
4x Display of U/I actual values
again
 The set values and the cut-off thresholds (OVP/OCP)
are not stored when switching off the device and after the
next start they are reset to minimum for voltage and maxi-
mum for current, OVP and OCP.
 In tracking mode, the preset button of the right-hand
control panel is inactive. The preset display of the right-
hand display is then controlled via the left-hand control
panel. Also see section „4.6 Tracking mode“.
4.2.2 Pushbuttons On/Off
These pushbuttons are used to manually and seperately
switch the power outputs 1 and 2 on or off, as long as the
device is not in remote control. The state of the particular
output is indicated by
or in the related display.
The pushbuttons might be locked by the LOCK state. See
„4.5 Control panel lock (LOCK)“.
The buttons also acknowledge errors. See section 4.1.2
for details.
4.3 Further control elements
Knobs Voltage & Current
These rotary knobs have no stop and are used to adjust
set values. Assignment:
• Left knob on the control panel:
Voltage (U) or overvoltage threshold of the dedicated
output, depending on preset mode
• Right knob on the control panel:
Current (I) or overcurrent threshold of the dedicated
output, depending on preset mode,
For details read below.
Operating the device
4.4 Adjusting set values
When adjusting the set values of voltage (U) and current (I),
a rule becomes active where both set values adjust each
other in order to not exceed the max. power of the device
according to P
max
= U
set
* I
set
. It applies:
• In Preset mode
If the output is off and the voltage set value is increased,
the current set value will automatically decrease some-
time or if the current set value is increased, the voltage
set value will automatically decrease sometime. For the
output being on, it will behave like in normal operation.
• During normal operation
a) If the output is on and constant voltage regulation is
active (CV in the display), then the current set value can
only be increased to a certain limit which is dened by
the formula maximum power = voltage set value * current
set value and depending on the voltage set value.
b) If the output is on and constant current regulation (CC
in the display) then the voltage set value can only be in-
creased to a certain limit which is dened by the formula
maximum power = voltage set value * current set value
and depending in the current set value.
 Setting the OVP threshold to lower than the voltage
set value results in an immediate OV error, if output is on.
 If the OCP value is identical to the current limitation
and that limit is reached, the OCP will have priority and
switch the output off.
Adjusting values manually can be done in ne or coarse
steps. Switching is done by pushing the corresponding
knob. In normal operation, coarse adjustment mode is
default. If ne adjustment is selected and if no value has
been changed for more than 20 seconds, the adjustment
mode will automatically return to coarse. In Preset mode,
the selected adjustment mode is held until Preset mode is
aborted manually or automatically.
Following step widths apply in dependency of the nominal
values (also refer to technical specs):
Voltage Current
Nom. value coarse ne Nom. value coarse ne
42V 1V 0.05V 3A 0.1A 0.01A
84V 1V 0.1V 5A 0.1A 0.01A
6A 0.1A 0.01A
10A 0.1A 0.01A
 Adjusting the output voltage of output 3 can only be
done by measuring it with a multimeter.