User manual

Page 36
PSI 9000 2U Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
2.3.5.2 Cable lead and plastic cover
A plastic cover for contact protection is included for the DC terminal. It should always be installed. The cover for
type 2 (see picture above) is xed to the connector itself, for type 1 to the back of the device. Furthermore the
cover for type 1 has break outs so that the supply cable can be laid in various directions.
The connection angle and the required bending radius for the DC cable must be taken into
account when planning the depth of the complete device, especially when installing in a 19”
cabinet or similar. For type 2 connectors only a horizontal lead can be used to allow for instal-
lation of the cover.
Connection examples:
• Type 1, up or down
• Space saving in depth
• No bending radius
• Type 2, horizontal lead
• Space saving in height
• Large bending radius
2.3.6 Grounding of the DC output
No matter if the power supply is operated stand-alone or in series connection with others, it is always only allowed
to ground one of all DC output poles. Following also has to be considered:
Due to limitations with the isolation a max. potential shift of ±400 V DC on the DC minus pole is allowed.
The DC minus pole of a stand-alone unit can be grounded right away, but it should only be done if absolutely nec-
essary, because the DC output is connected to PE via X capacitors in order to gain a better HF ltering.
Grounding the DC plus pole is only allowed for models where the nominal output voltage does not exceed the 400
V DC limit, else the potential shift on the DC minus could exceed that limit.
• 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!