32
EN
Instruction Manual
PSI 800 R Series
Date: 02-09-2012
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
current 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 follo-
wed:
• 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
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. Pins (+) and (-) of terminal
Share Bus
of all units are also connected in parallel.
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
voltage, 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 for-
mation 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 accu-
rate readings, either the actual current is multiplied
by the number of units in the parallel connection
(only applicable if all have the same nominal output
current) or all units will have to be read seperately.