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EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PS 9000 T Series
2.3.4 Connection to DC loads
• Connection to and operation with transformerless DC-AC inverters (for example solar in-
verters) is restricted, because the inverter can shift the potential of negative output (DC-)
against PE (ground), which is limited to max. ±400 V DC.
• When using any model which is rated for 40 A or higher current, attention has to be paid to
where the load is connected on the DC output terminals. The front-side 4mm connection
point is only rated for
max. 32 A
!
• Connection of voltage sources which can generate a voltage higher than 110% nominal of
the device model is not allowed!
• Connection of voltage sources with reversed polarity is not allowed!
The DC load output is on the front side of the device and is
not
protected
by a fuse. The cross section of the connection cable is determined by the
current consumption, cable length and ambient temperature.
For cables
up to 5 m
and average ambient temperature up to 50°C, we
recommend:
up to
10 A
:
0.75 mm² (AWG18)
up to
15 A
: 1.5 mm² (AWG14)
up to
20 A
:
4 mm² (AWG10)
up to
40 A
: 10 mm² (AWG8)
up to
60 A
:
16 mm² (AWG4)
per lead
(multi-conductor, insulated, openly suspended). Single cables of, for example, 16 mm² may be replaced
by e.g. 2x 6 mm² etc. If the cables are long then the cross section must be increased to avoid voltage loss and
overheating.
2.3.4.1 Possible connections on the DC output
The DC output on the front is of type clamp & plug and can be used with:
•
4 mm system plugs (Büschel, banana, safety) for
max. 32 A!
•
Spade lugs (6 mm or bigger)
•
Soldered cable ends (only recommended for small currents up to 10 A)
When using any type of lugs or cable end sleeves, only use those with insulation in
order to ensure electric shock protection!
2.3.5 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
filtering.
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 must not be connected in series!
