Ea Elektro Automatik EA Elektro-Automatik EA-EL 9750-50 Electronic Load 0 - 50 A 0 - 750 Vdc 0 - 3000 W / 4800 W pk 33200253 データシート
製品コード
33200253
30
EN
Instruction Manual
EL 9000 A Series
Date: 11-16-2011
About the device
3.3 Scope of delivery
1 x Electronic load
1 x Printed instruction manual
1 x Mains cord
1 x WAGO plug 7pole (System Bus, plugged)
1 x Printed instruction manual
1 x Mains cord
1 x WAGO plug 7pole (System Bus, plugged)
4. General
4.1 Prologue / Warning
This instruction manual and the device are intended to
be used by users who know about the principle of an
electronic load. The handling of the device should not
be left to persons who are unaware of the basic terms of
electrotechnology, because these are not described in
this manual. Inappropriate handling and non-observance
of the safety instructions may lead to a damage of the
device or loss of warranty!
4.2 Mains connection / Grounding
The unit is grounded with the mains cord. Thus the unit
may only be operated at a mains socket with grounding
contact. This must not be interrupted with an extension
cable without grounding wire!
4.3 Cooling
The air inlets on the front and the air outlets at the rear
have to be kept clean to ensure proper cooling. Take care
of at least 20cm distance (at the rear) to any surrounding
objects in order to guarantee unimpeded air flow.
Caution! Hot air can emerge from the air outlets!
Caution! Hot air can emerge from the air outlets!
4.4 Disassembly
Warning! The unit must not be opened and repaired by
the user.
When opening the unit or removing parts from the inside
When opening the unit or removing parts from the inside
with tools there is risk of electric shock by dangerous
voltages. Open the unit only at your own risk and discon-
nect it from the mains before.
Any servicing or repair may only be carried out by trai-
Any servicing or repair may only be carried out by trai-
ned personnel, which is instructed about the hazards of
electrical current.
4.5 Dynamic characteristics and stability criteria
The electronic load is characterised by short rise and
fall times of the current, which are achieved by a high
bandwidth of the internal regulation circuit.
In case of testing sources with own regulation circuits at
In case of testing sources with own regulation circuits at
the load, like for example power supplies, a regulation
instability may occur. This instability is caused if the com-
plete system (feeding source and electronic load) has too
little phase and gain margin at certain frequencies. 180°
phase shift at > 0dB amplification fulfills the condition
for an oscillation and results in instability. The same can
occur when using sources without own regulation circuit
(eg. batteries), if the connection cables are highly induc-
tive or inductive-capacitive.
The instability is not caused by a malfunction of the load,
but by the behaviour of the complete system. An impro-
vement of the phase and gain margin can solve this. In
practice, a capacity is directly connected to the DC input
of the load. Recommended is 1µF, for slower systems
some 100µF can be necessary.
4.6 Temperature characteristics
Addtionally to the technical maximum power of 4800W, to
which the device is limited to, it features a temperature-
depending power derating. This is in effect if the device
gets heated up by high power input. The figure below
shows the progression of the power in relation to the time.
For example, three different start, respectively ambient
conditions and their effect to the power derating. This is
only a guide to how the power derating works. Depen-
ding on many factors, the actual behaviour of the device
and its derating will differ more or less. Explanation: the
max. input power at the start, i.e. after the input has been
switched on, depends on the temperature condition. If the
load was in derating before and has not cooled down so
it would take the full input power, it will probably start with
a limited power and then go up.
Cold start 20°C = cold unit at 20°C ambient temperature.
Warm start 25°C = warm, running unit at 25°C ambient temp.
Cold start 20°C = cold unit at 20°C ambient temperature.
Warm start 25°C = warm, running unit at 25°C ambient temp.
0 W
1000 W
2000 W
3000 W
4000 W
5000 W
6000 W
0s
100s
200s
300s
400s
500s
Cold start 20°C
Cold start 30°C
Warm start 25°C