User manual

54
© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
EN
Instruction Manual
PS 8000 3U Series
Date: 01-24-2012
11. Further applications
11.1 Parallel connection in Share bus mode
Share bus operation is used to gain a symmetric load current
distribution when running multiple units in parallel connection.
Important: in this operation mode, the unit with the highest
output voltage controls and denes the output voltage of the
whole parallel connection. It means, any unit of the system
could be in charge. Thus it recommended to pick a unit that is
used to control the whole system, while the set value of voltage
for the remaining units is set to the required minimum. Voltage
and power set value could be set to 100% or, if not desired,
set to equal values on every unit so that the total results in
what‘s required.
In case a unit is broken and will completely shut off, the parallel
connection will continue to work without interruption. This is
called redundancy.
For a device alarm like overtemperature (OT) or overvoltage,
the output voltage will rise or fall to the highest value that was
adjusted on any of the remaining units.
The wiring of the terminal „Share“, which is required for Share
bus operation, is explained in section „5.8. Terminal „Share““.
Also see gure 12 below.
Note
If remote sense is going to be used, it is recommended only
to connect the „Sense“ input of the main unit that determines
the system voltage.
Attention!
This is a purely analogue connection. No totals formati-
on of actual values on any of the units.
Attention!
Share bus connection to devices other than PS 8000 3U
series is not allowed!
11.2 Series connection
Series connection of two or more units is generally allowed.
But there are some restrictions and rules to consider because
of safety and isolation reasons:
• No negative DC output pole of a unit in the series
connection may be raised to a potential >300V against
ground (PE)!
• Every unit is adjusted seperately, there is no master-slave
connection.
• The Share bus must not be wired!
• The grounds (AGND, DGND) of the analogue interfaces
of the units in series connection must not be wired to
each other!
• Remote sense must not be wired!
• It is recommended to build a series connection only with unit
of same model.
Example: Three identical units with 200V nominal voltage, for
example PSI 8200-70 3U, shall be connected in series. When
calculating, the total voltage of that series connection could go
up to 600V. Looking at the resulting potentials on the negative
outputs of the units, the 3rd unit negative DC pole could be
raised to 400V if all units put out maximum voltage. This is
not permitted! So one of the lower units has to be limited to a
certain maximum.
Miscellaneous
The gure below claries that the resulting total voltage would
only be 500V:
12. Other
12.1 Accessories and options
Following accessories are optionally available:
a) Digital interface cards
Pluggable and retrottable, digital interface cards for USB,
RS232, CAN, GPIB/IEEE (SCPI only), Probus or Ethernet/
LAN (SCPI only) are available. Details about the interfaces can
be found in the interface cards user manual.
Following options are available:
a) High Speed Ramping
Increased dynamics of the output voltage by reduced output
capacity. It must be pointed out, that other output related va-
lues also increase! This is a permanent modication which is
not switchable.
b) Watercooling
Internally integrated water cooling block. The watercooling is
used prevent premature shutdown of the power output because
of overheating.
12.2 Firmware update
A rmware update of the device should only be done if the
device shows erroneous behaviour or if new features have
been implemented.
In order to update a device, it requires a certain digital inter-
face card, a new rmware le and a Windows software called
„Update tool“.
These interfaces are qualied to be used for a rmware update:
• IF-U1 (USB)
• IF-R1 (RS232)
• IF-E1 (Ethernet/USB)
• IF-PB1 (Probus/USB)
In case none of the above interface types is at hand, the device
can not be updated. Please contact your dealer for a solution.
The update tool and the particular rmware le for your device
are obtainable from the website of the device manufacturer, or
are mailed upod request. The update too will guide the user
through the semi-automatic update process.