40
EN
Instruction Manual
EL 9000 HP Series
Date: 05-31-2011
6.12 Functions of the terminal System Bus
6.12.1 Two-quadrants operation
The Share Bus pin (only usable in combination with the
power supplies of series PS 9000, PSI 9000, PSI 8000
or PS 8000) can be used to set up a system for two-
quadrants operation. In order to use this operation the
System Bus
pins have to be wired as follows:
Connect Pin 5 (Share Bus EL9000) with Pin 5 (Share Bus
of power supply) and Pin 6 (AGND EL9000) with Pin 6
(AGND power supply).
In this Share Bus operation the electronic load operates
as the leading component and the power supply as the
depending one.
Typical applications for the two-quadrants operation are:
•
Battery tests with automatic charge and discharge
cycles
•
Automotive electronic tests with simulation of transients
like for example voltage break-ins during engine starts
•
Cyclic charging and discharging of capacitors
6.12.2 Selecting the regulation speed
The regulation speed (or time) of the load has delibera-
tely been set to slow and lies at typical 50ms (only for
CV and CP mode). By this setting it is accomplished that
critical feeding sources like power supplies with unknown
regulation characteristics can be loaded steadily and run
free from unwanted oscillation. The dynamics is then
situated at the given minimal regulation time. See „2.2
Device specific data“, section „Dynamics“.
If a better regulation dynamics is required, it can be ac-
tivated by switching the load to
fast regulation
. This is
done at the terminal
System Bus
, Pin 7 (FastReg) and
6 (AGnd). If these pins are shorted, the fast regulation
becomes active. By default, the slow regulation is active.
Changing this configuration must only happen while the
load is completely switched off from the mains!
6.12.3 Crossflow adjustment (two-quadrant operation)
Using two-quadrants operation, i.e. running a load in
combination with a power supply, necessarily requires
the use of the Share Bus, whereby the load controls the
power supply. The pins 2 (I-Cross) and 3 (I-Cross-Rtn)
of the terminal
System Bus
are used to connect a resi-
stor (0,25W) which injects a crossflow current between
the power supply and the load. This current effects that
load and power supply are permanently active and thus
can react faster to set value changes. Following applies:
R = 0 --> Crossflow current approx. 10% of nom. current
of the device
R = infinite --> Crossflow current = 0 (default)
The crossflow current can be continuously adjusted with
the resistor from 0 to 10% of the nominal current of the
load.
In practice, this is only used in a little number of special
applications where extremely fast load changes are re-
quired between the two quadrants. Common applications
like, for example, automotive start-up transients after
DIN40839 do not require this feature.
Handling the device
6.12.4 Remote sense
The remote sense feature is described in section „5.
6.12.5 Pin assignment of terminal System Bus
Pin 1 = Sense (+)
Pin 2 = I-Cross
Pin 3 = I-Cross-Rtn
Pin 4 = Sense (-)
Pin 5 = Share Bus
Pin 6 = AGnd
Pin 7 = FastReg
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