Packaging; Before Use; Working Principle - elc AL 781NX Bedienungsanweisungen

Display : red Led for the current regulation
digital ammeter with 3 digits of 14mm
Resolution : 10mA
2.3 ACCESSORIES OF THE INSTRUMENT
Your AL 781NX power-supply is delivered with its mains cord «EUROPE» bipolar
plug + Earth and its instructions manual.
2.4 OTHER SPECIFICATIONS
Mains : 230V 50 / 60Hz
Mains input : «EUROPE» CEE 22 receptacle with bipolar cord + Earth
Powering : Bipolar switch
Outputs : Safety terminals. VDE 0110 Standard
Consumption : 315VA
Electric strength : 2300VAC between input and output
1350VAC between input and case
100VDC between output and case
Dimensions : L=285mm H=151mm D=215mm
Appearance : Polycarbonate front silk-screen printed,
epoxy paint on case
Weight : 8.4 kg
Condition of use : +5°C to 40°C Imax = 4A
+5°C to 30°C Imax = 5A
Condition of storage : -10°C to 50°C
Condition of moisture : See diagram
PROTECTIONS
Safety class
Against short-circuit
Against excessive temperature rises : by thermal circuit-breaker, incorporated in
Against any fault
STANDARDS
EMC EN 61326-1standard B
EN 55011 group 1 Class B
SAFETY EN 61010-1
Overvoltage category II and pollution degree 2

3. WORKING PRINCIPLE

A power supply able to work at constant voltage or current is called «with rectangular
characteristic» (Fig. 1). The change from «constant voltage» working to «constant
current» working is automatic according to the adjustment of Vs and Is and to the load
%
8 0
5 0
m a x i m u m r e l a t i v e
m o i s t u r e
3 1 4 0
: I
: by current limiting.
the transformer
: by fuse in the primary winding.
applied in the output.
If the RL load resistance is higher than the ratio Vs/Is, the power supply works
at constant voltage for the value of the selected output voltage and with a current
limiting to Is. If RL varies from the infinite to Vs/Is, I can vary from 0 to Is
(I1 example) and the output voltage is constant.
For the power-supply being able to work at
constant voltage, the output current
must be lower than the selected limit current.
In the contrary case, the power supply changes
over to the «constant current» working.
If the RL load resistance is lower than the ratio Vs/Is,
the power supply works at constant current, for a
current value selected and with a voltage limiting to Vs.
If RL varies from 0 to Vs/Is, V can vary from 0 to Vs and Is = constant (V1 example).
For the power-supply being able to work at constant current, the output voltage has
to be set at the maximum of the specified values ; and the limit current has to be
set by an appropriate adjustment on acting on the Icc function.
Caution, when the output limit voltage and current are set, so that the load resistance
is equal to the ratio Vs/Is, this can cause a working instability.
4. PRELIMINARY INSTRUCTIONS
4.1

PACKAGING

During its transport, the power-supply is protected by a «Bull-pack» wrapping and
placed in a cardboard box avoiding any damage. Keep this material ; you may use
it later on.
° C
Packing list :
1 instructions manual
1 Power-supply : AL781NX 1 cardboard wrapping
4.2 MOUNTING AND PLACING OF THE INSTRUMENT
For a natural and correct cooling, the power supply must stand on its four rubber
thrusts and all ventilation openings must be widely cleared.
Connect the mains cord in the «EUROPE» CEE22 receptacle at the rear of the
instrument.

5. BEFORE USE

Connect the power supply to mains (230V) and switch on with the «On/Off» switch.
6. INSTRUCTIONS FOR USE
- 8 -
V
RL>Vs/Is
Vs
V1
I1
1 «Bull-pack» wrapping 1 cardboard packing piece
1Mains cord
RL=Vs/Is
Fig.1
RL>Vs/Is
I
Is