User manual

Page 38
PSI 9000 DT Series
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EA Elektro-Automatik GmbH
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2.3.6 Grounding of the DC output
It is allowed to ground the DC output.The DC minus pole can be grounded right away, but it should only be done
if absolutely necessary, because the DC output is coupled to PE via X capacitors in order to achieve a better HF
ltering.
Grounding the DC plus pole is only allowed for models where a nominal output voltage of less than 400 V, else
the potential shift on the DC minus could exceed the 400 V DC limit.
Series connection is not intended for this series. In case it is unavoidable for an application, only a max. potential
shift of ±400 V DC on the DC minus pole is allowed due to limitations of the internal isolation.
• 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!
• Models with a rated output of 500 V or higher must not be connected in series!
2.3.7 Connection of remote sensing
• The cross section of the sense cables is noncritical. However, it should be increased with in-
creasing cable length. Clamp terminal Sense is suitable for cross section of 0.2 mm² (AWG24)
to 10 mm² (AWG8)
• Sense cables should be twisted and laid close to the DC cables to damp oscillation. If nec-
essary, an additional capacitor can 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 13 - Principle example for remote sensing wiring
The connector Sense is a clamp terminal. It means for the remote sensing cables:
• Insert cables: crimp sleeves onto the cable ends and simply push them into the bigger square hole
• Removecables:useasmallatscrewdriverandpushintothesmallersquareholenexttothebiggeroneto
loosen the cable clamp, then remove cable end
2.3.8 Connecting the analog interface
The 15 pole connector (Type: Sub-D, D-Sub) on the rear side is an analog interface. To connect this to a control-
ling hardware (PC, electronic circuit), a standard plug is necessary (not included in the scope of delivery). It is
generally advisable to switch the device completely off before connecting or disconnecting this connector, but at
least the DC output.
The analog interface is galvanically isolated from the device internally. Unless absolutely re-
quired, do not connect any ground of the analog interface (AGND) to the DC minus output as
this will cancel the galvanic isolation.