User manual

Page 23
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PS 5000 A Series
2.3.5 Grounding of the DC output
Individually operated devices can always be grounded from the DC minus or DC plus pole, i.e. one of both can
be directly connected to PE.
However, when using series connection restrictions apply, because when grounding the DC plus pole of the series
connection, the DC minus poles of all units are shifted in negative direction against PE and this is only allowed
up to 200 V DC for any DC minus.
Thus, in case it is required to ground the DC plus pole, it is not allowed to connect 200 V models in series resp.
when using 80 V units, not allowed to connect more than two units in series.
Furthermore, following has to be taken into consideration:
When grounding any of the DC output poles it is important to check if any pole of the
load or any signal on a controlling application (PC, PLC) is also grounded. This could
lead to a short circuit or bypass the galvanic isolation of the USB interface!
2.3.6 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specications(seesection „1.8.3. Specic technical data“) the level of maximum possible com-
pensationisgiven.Ifthatisinsufcient,thecablecrosssectionmustbeincreased.
• 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. 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 6 - Example for remote sensing wiring when using the aux output