User manual

Page 53
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 3000 B Series
3.10 Other applications
3.10.1 Series connection
Series connection is not a permissible operating method for electronic loads and must not be
installed or operated under any circumstances!
3.10.2 Parallel operation
Multiple devices of same kind and ideally same model can be connected in parallel in order to create a system
with higher total current and hence higher power. This can be achieved by connecting all units to the DC source
in parallel, so the total current can spread across all devices. There is no support for a balancing between the
individual units, like in form of a master-slave system. All loads would have to be controlled and set up separately.
However, it is possible to have a parallel control by the signals on the analog interface, as this one is galvanically
isolated from the rest of the device. There are few general points to consider and adhere:
• Always make parallel connections only with device of same voltage, current and power rating, but at least with
those of the same voltage rating
• Never connect the ground signal of any analog interface with the negative DC input, because it will void the
galvanic isolation. This rule is especially important when going to connect any DC input pole to ground (PE) or
to shift its potential.
• Never connect DC input cables from load device to load device, but instead from every load device directly to
the source, else the total current will exceed the current rating of the DC input clamp
4. Service and maintenance
4.1 Maintenance / cleaning
The device needs no maintenance. Cleaning may be needed for the internal fans, the frequency of cleanse is
depending on the ambient conditions. The fans serve to cool the components which are heated by the inherent
highdissipationofenergy.HeavilydirtlledfanscanleadtoinsufcientairowandthereforetheDCinputwould
switch off too early due to overheating or possibly lead to defects.
Cleaning the internal fans can be performed with a vacuum cleaner or similar. For this the device needs to be opened.
4.2 Fault nding / diagnosis / repair
If the equipment suddenly performs in an unexpected way, which indicates a fault, or it has an obvious defect, this
can not and must not be repaired by the user. Contact the supplier in case of suspicion and elicit the steps to be
taken.
It will then usually be necessary to return the device to Elektro-Automatik (with or without warranty). If a return for
checking or repair is to be carried out, ensure that:
• thesupplierhasbeencontactedanditisclariedhowandwheretheequipmentshouldbesent.
• the device is in fully assembled state and in suitable transport packaging, ideally the original packaging.
• a fault description in as much detail as possible is attached.
• if shipping destination is abroad, the necessary customs papers are attached.
4.2.1 Replacing a defect mains fuse
The device is protected by a fusible which is inside a fuse holder on the rear of the device. The fuse rating is printed
next to the fuse holder. Replace the fuse only with one of same size and rating.
4.2.2 Firmware updates
Firmwareupdatesshouldonlybeinstalledwhentheycaneliminateexistingbugsintherm-
ware in the device or contain new features.
Thermwareofthecontrolpanel(HMI),ofthecommunicationunit(KE)andthedigitalcontroller(DR),ifneces-
sary, is updated via the rear side USB port. For this the software “EA Power Control” is needed which is included
withthedeviceoravailableasdownloadfromourwebsite,togetherwiththermwareupdate,oruponrequest.