22
EN
Instruction Manual
PSI 800 R Series
Date: 02-09-2012
3. Functional description
3.1 General
The power supply is pre-configured 0 output voltage
and 100% output current.
The output voltage is supervised for adjustable
undervoltage thresholds.
The control panel is used to set conditions, set up
the device and to adjust output values. Alternative-
ly, the device can be remotely controlled via the
internal, analogue interface or an option, digital
interface card.
3.2 Remote sense
In order to compensate voltage drops along the load
leads, the device features remote sense inputs on
the front. Here the sensed voltage from the load
is connected with correct polarity. Remote sense
can compensate up to a certain level. Refer to the
technical specifications about that level.
When not using the sense inputs, they just remain
open. It is not required to bridge them to the output.
The cross section of the sense leads is non-critical.
3.3 Overvoltage protection (OVP)
All models feature an overvoltage protection circuit
which is set 110% of the nominal output voltage. In
case of an overvoltage condition, whether caused by
an internal defect or by external reasons, the power
output is switched off and the error is indicated by
the a status text „
OV
“ in the display and also by pin
„ERROR“ of the analogue interface. The error in-
dication remains in the display until acknowledged
by button
.
After the OV condition is gone, the output can be
switched on again.
3.4 Overtemperature (OT)
All models also feature an internal temperature su-
pervision. In case of overheating, the power output
will be temporarily switched off until the device has
cooled down.
The state of the output after an OT error can be con-
figured in the setup. During an OT condition a status
text „
auto ON
“ indicates that the output will be on
after the OT condition is gone. The error indication
remains in the display until it is acknowledged by
the button
.
The condition is indicated by the status text „
OT
“
in the display and by pin „ERROR“ of the analogue
interface. The output state restoration can be deac-
tivated in the setup menu by the parameter „
OT
disappear = OFF
“.
3.5 Output restoration after blackout
After a mains blackout (same as switching the in-
put voltage off by hand), the device will reconstruct
the last condition by restoring output state and set
values.
The output state restoration can be deactivated
in the setup menu by the parameter „
Power ON =
OFF
“, while „
Power ON = restore
“ will set the output
to the last condition before the blackout.
3.6 Undervoltage supervision
The supervision of an undervoltage condition is done
with two thresholds. It will be activated after 250ms
and everytime the output is switched on.
In case the output voltage is below the 1st under-
voltage threshold („
UV warning
“) after the output
has been switched on, the display will indicate a
warning
. The warning remains in the display
until acknowledged by the button
. This pre-
vents unseen errors. The warning is removed if no
error is persistent anymore and after it has been
acknowledged.
The 2nd undervoltage threshold („
UV shutdown
“) will
generate an alarm if the output voltage falls below
and switch off the output. This is indicated by
and on the „ERROR“ pin of the analogue interface.
The output can be switched on again, after the alarm
has been acknowledged.
3.7 Control locations
Control locations are places from where the device
is accessed. With this series, there are several
control locations which are indicated by status texts
in the display:
• local
- is manually activated by the user with but-
ton
. In this situation the device can not be
controlled remotely. This can be useful to intercept
during a permanent remote control and adjust
some settings on the device. After enabling remote
control again by leaving
local
with button
,
remote control is not activated automatically.
• remote
- the unit is remotely controlled by one of
the digital interface cards and manual access is
not possible. Pressing button
changes to
local
and aborts
remote
.
• extern
- the unit is remotely controlled by the
internal analogue interface and manual access
is not possible. Pressing button
changes to
local
and aborts
extern
.
About the device
