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© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
EN
Instruction Manual
PSI 800 R Series
Date: 05-13-2011
Set values 1
Analogue inputs (AI)
The example shows how the set values can be
controlled using the reference voltage (VREF) and
potentiometers on the set value inputs.
The potentiometer should be 10kOhm each or higher.
Set values 2
Analogue inputs (AI)
The example shows how to control voltage and cur-
rent by means of external voltage sources.
Attention!
Never connect voltages >12V to these
inputs!
Set values >10V or >5V, depending on the voltage
range selection in the setup, are clipped to 100%
nominal value.
Handling the device
6. Other applications
6.1 Series connection
It is possible to connect multiple units of the same
type to a series connection if these rules are followed:
•
No master-slave operation
•
The grounds of the analogue interfaces MUST
NOT be connected to each other. This also applies
for any other signal on the analogue interfaces. If
remote control is required, it can be done using
galvanic isolation amplifiers and by controlling all
units in parallel.
•
Any load current leading conductor must be dimen-
sioned for the maximum output current of the unit
with the highest nominal output current.
•
No negative DC output pole of any device may have
a potential >300V against earth (PE).
6.2 Parallel connection (Share bus)
Multiple units with identical output voltage and identi-
cal output current can be used in parallel connection
in order to increase the total output current. To build a
parallel system with symmectrical current distribution,
the device features a Share bus connector.
Important
: in this operation mode, the unit with the
highest 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 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 error like overtemperature (OT) or over-
voltage, 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 very simple. See figure
below. The cross section of the Share bus connection
is non-critical. In order to have low susceptibility, the
two wires should be twisted.
Note: if remote sense is going to be used, it is recom-
mended only to connect the „Sense“ input of the main
unit that determines the system voltage.
Attention! This is a purely analogue connection.
No totals formation of actual values on any of
the units.
