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 데이터 시트

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33200253

Instruction Manual

EL 9000 A Series

Date: 11-16-2011

Handling the device

6.11.2 Selecting the regulation speed

The regulation speed (or time) of the load has deliberately

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 regu-

lation characteristics can be loaded steadily and run free

from unwanted oscillation. The dynamics is then situated

at the given minimal regulation time. See „2. Technical

specifications“, 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!

6.11.3 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.

6.11.4 Remote sense

The remote sense feature is described in section „5.

6.11.5 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