Page 30
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
EL 9000 B 15U/24U Series
2.3.6 Grounding of the DC input
The device’s DC input can always be grounded on the minus pole, i.e. can be directly connected to PE. The DC
plus pole, however, if it is to be grounded, may only be so for input voltages up to 400 V, because the potential of
the minus pole is shifted into negative direction by the value of the input voltage. Also see technical specification
For this reason, for all models which can support an input voltage higher than 400 V grounding of the DC plus
pole is not allowed.
•
Do not ground the DC plus pole on any model with >400 V nominal voltage
•
If grounding one of the input poles ensure that no output pole of the source (e.g. power supply)
is grounded. This could lead to a short-circuit!
2.3.7 Connecting the “Share” bus
The “Share” bus on the rear side is intended to balance the current of the units in the cabinet and must not be
removed, unless a unit is going to be removed for repair or maintenance purposes. The cover which is mounted
on top of the connectors “Sense” and “Share” with some models must always be thoroughly installed.
In case of adding a unit, where possible, the Share bus must extended.
2.3.8 Connection of remote sense
Though every unit in the cabinet has a “Sense” connector, remote sensing when being used is only wired to the
master unit. This unit is responsible for the voltage regulation and remote sensing compensation in constant volt
-
age operation. It forwards the regulation signal to the slave units via the Share bus.
•
Both pins „NC“ of the Sense connector must not be wired!
•
Remote sensing is only effective during constant voltage operation (CV) and for other regulation
modes the sense input should be disconnected, if possible, because connecting it generally
increases the oscillation tendency.
•
The cross section of the sense cables is noncritical. Recommendation for cables up to 5 m:
use at least 0.5 mm²
•
Sense cables should be twisted and laid close to the DC cables to damp oscillation. If neces
-
sary, an additional capacitor should be installed at the load or the source to eliminate oscillation
•
The + sense cables must be connected to + on the source and - sense to - at the source,
otherwise both, sink and source could be damaged
Figure 8 - Principle of remote sensing wiring on the master unit
