56
EN
Operating Guide
PSI 8000 2U Series
Date: 28-06-2012
Using the power supply
7.5 Configuring the graphic display
D
The menu page
Display
lets you configure all parameters
related to the graphic display.
Backlight
Default:
YES
= YES
The backlight is permanently on
= delay 60s
The backlight will be switched off with
a delay of 60s after a button or a rotary
knob has been used the last time
Contrast
Default:
80%
= { 70%...90% }
The contrast can be adjusted to suit the needs of the location
where the unit is installed and for a clearer view at the values.
7.6 Supervision
Super
The
Supervision
menu lets you configure the supervision of
output voltage, output current and output power. You can also
supervise a step function. The menu
Supervision
leads
you to following menu selection:
U thresholds
I thresholds
Step response
7.6.1 Voltage supervision
U thre
The menu page
U thresholds
lets you configure the over-
voltage threshold OVP) as well as the supervision circuits for
over- and undervoltage.
Overvoltage protection (OVP)
U ovp
Default:
1,1*U
nom
= {U>… 1,1*U
nom
}
Accuracy:
0.3% of U
Nom
Resolution:
4 digits
Response time:
<100us
The overvoltage protection is intended to protect the power sup-
ply output. But you can also, in order to protect the load, adjust
it to the maximum allowed voltage of your load. The output is
instantly shut down if this threshold is reached.
Example: an 80V unit can be adjusted up to 88V for
U
OVP
OV
It is displayed as an alarm. Also see „6.13
Alarms, warnings and signals“.
Overvoltage supervision
U>
Default:
U
nom
=
{ U<… U
ovp
}
Tu>
Default:
100ms
=
{ 0…99:59h}
This is slightly different from the OVP (see above). Here the
voltage is also supervised, but it is notified with either an alarm,
a warning or a signal and after a definable delay
Tu>
. The
signal vanishes if the voltage is under the thre-shold for the time
Tu>
. Hence you can supervise overvoltages without getting
an OVP error every time or if you only want to get an alarm if
the overvoltage is persistent longer than defined by
Tu>
.
U>
Alarm: Overvoltage
This error shuts down the power output. An alarm has to be ack-
nowledged, before the power output can be switched on again.
U>
Warning: Overvoltage
The error is notified and remains until it is acknowledged and
not persistent anymore.
U>
Signal: Overvoltage
