User manual

Page 21
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
EL 9000 T Series
2.3.4 Connection to DC sources
• When using the 45 A model, attention has to be paid to where the load is connected to the
DC input 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 input 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 20 A: 4 mm² (AWG10)
up to 45 A: 10 mm² (AWG8)
per lead (multi-conductor, insulated, openly suspended). Single cables of, for example, 10 mm² may be replaced
by e.g. 2x 4 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 input
The DC input 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 input
The device can always be grounded on 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 input voltages up to 400 V, because the potential of the minus
poleisshiftedintonegativedirectionbythevalueoftheinputvoltage.Alsoseetechnicalspecicationsheetsin
1.8.2, item “Insulation”.
For this reason, for all models which can support an input voltage higher than 400 V grounding of the DC plus
pole is not allowed.
• Do not ground the DC plus pole on any model with >400 V nominal voltage
• If grounding one of the input poles ensure that no output pole of the source (e.g. power supply)
is grounded. This would lead to a short-circuit!
2.3.6 Connection of remote sensing
• 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 sensing cables is noncritical. Recommendation for cables up to 5 m:
use at least 0.5 mm².
• Sensing 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 source to eliminate oscillation. Also see
section 3.2.5.
• Sensingcablesmustbeconnected+to+and-to-atthesource,otherwisethesenseinput
of the electronic load can be damaged. For an example see Figure 6 below.