Grounding Of The Dc Output; Connection Of Remote Sensing; Connecting The "Share" Bus - Elektro-Automatik PS 9000 1U Betriebsanleitung

2.3.6

Grounding of the DC output

Individually operated devices can always be grounded from the DC 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 output voltages up to 400 V, unless
stated otherwise in the technical specifications.
For this reason, for all models which can provide an output voltage of more than 400 V, earthing of the DC plus
pole is not recommended, because it will shift the potential of the DC minus pole in negative direction, up to the
maximum output voltage. If the output voltage is not adjusted higher than 400 V, grounding the DC plus pole is
allowed with restrictions.
• Grounding of the DC-plus pole for any model with >400 V nominal voltage only at one's own
risk! Risk of damaging the device! Risk of voiding warranty!
• Digital and analog interface are galvanically isolated from the DC output and should never be
grounded, but under no circumstances if any of the DC output poles is grounded too, because
this will cancel the galvanic isolation
• If grounding one of the DC output poles check if any pole of the load is already grounded. This
could lead to a short circuit!
2.3.7

Connection of remote sensing

In order to compensate, to a certain degree, the voltage loss in a DC cable, the device provides the possibility to
connect the remote sensing input "Sense" to the load. The device recognizes the remote sensing mode automati-
cally and regulates the output voltage (only in CV operation) at the load rather than at its own DC output.
In the technical specifications (see section „1.8.3. Specific technical data") the level of maximum possible com-
pensation is given. If that is insufficient, the cable cross section must be increased.
Both pins „NC" of the Sense connector must not be wired!
• The cross section of the sense cables is noncritical. However, it should be increased with
increasing cable length. 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/consumer to eliminate oscillation
• The sense cables must be connected + to + and - to - at the load, otherwise both systems
may be damaged
Figure 7 - Example for remote sensing wiring
2.3.8

Connecting the "Share" bus

The "Share" connector on the back side is intended to balance the current of multiple units in parallel operation,
especially when using the integrated function generator of the master unit. For further information about this mode
of operation can be found in section „3.9.1. Parallel operation in Share Bus mode" .
For the connection of the share bus the following must be paid attention to:
• Connection is only permitted between compatible devices (see „1.9.5. Share Bus-Connection"
for details) and between a max. of 10 units
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
PS 9000 1U Series
www.elektroautomatik.de
ea1974@elektroautomatik.de
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