Parallel Connection (Share Bus) - Elektro-Automatik PS 8000 2U Serie Bedienungsanleitung

Operating the device
There are some restrictions and rules to consider because of
safety and isolation reasons:
• The negative DC output pole of no unit in the series
connection may be raised to a potential >300V against
ground (PE)!
• The Share bus must not be wired!
• The grounds (AGND, DGND) of the analogue interfaces
of the units must not be wired to each other!
• Remote sense must not be wired!
Example: Two identical units with 360V nominal voltage, for
example PS 8360-15 2U, shall be connected in series. When
calculating, the total voltage of that series connection could go
up to 720V. Looking at the resulting potentials on the negative
outputs of the units, the 2nd unit's negative DC pole could be
raised to 360V. This is not permitted! So the lower unit has to
be limited to a certain maximum. The figure below clarifies that
the resulting total voltage would be 660V:
Caution! A total voltage of a series connection of 600V
should not be exceeded!
Figure 10. Parallel connection with Share Bus
44
Date: 08-15-2011

11.1.2 Parallel connection (Share Bus)

Note: only available with devices from 1kW nominal power!
Attention! Only units of the same type (voltage and current)
must be used for this operation mode.
Share bus operation is used to gain a symmetric load current
distribution when running multiple units in parallel connection.
Follwing connections are required: connect all (+) DC outputs
of the units to each other and all (–) DC outputs to each other.
Pin 7 (Share Bus) and pin 8 (Ground) of terminal System Bus
of all units are also connected in parallel. For an example wiring
see figure 10.
Important: in this operation mode, the unit with the lowest
output voltage controls and defines the output voltage of the
whole parallel connection. It means, any unit of the system
could be in charge. Thus it recommended to pick one unit that
is used to control the whole system, while the set value of vol-
tage, current and power for the remaining units are set to the
required maximum. All units displays their own actual values,
there will be no totals formation of the system's actual values.
Note: in case of an error like overheating (OT) or overvoltage
(OVP), the whole system will shut down the output voltage.
In order to control the whole system remotely, it is sufficient to
control the master via its analogue or digital interface. When
reading actual values, the voltage monitor value will represent
the overall system voltage, but the current monitor only the
output current of the master. In order to get accurate readings,
either the actual current is multiplied by the number of units in
the parallel connection (only applicable if all have the same no-
minal output current) or all units will have to be read seperately.
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Irrtümer und Änderungen vorbehalten
EN
Instruction Manual
PS 8000 2U Series