53
© 2006, Elektro-Automatik GmbH & Co. KG
EN
Using the power supply
7.6.2
Voltage supervision
U thr
The menu page
U thresholds
lets you configure the
overvoltage 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
supply 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.
(see also „6.10 Alarms, warnings and signals“)
Overvoltage supervision
U>
Default:
U
nom
=
{ U<… U
ovp
}
Tu>
Default:
100ms
=
{ 0…99:99h}
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 over-
voltages 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
acknowledged, 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
Undervoltage supervision
U<
Default:
0V
=
{ 0…
U>}
Tu<
Default:
100ms
=
{ 0…99:99h}
As soon as the voltage falls below the undervoltage threshold,
the undervoltage is notified after the response time
Tu<
.
The notification vanishes, if the undervoltage limit is exceeded
for the time
Tu<
. This undervoltage error is suppressed
for T
0
=100ms after the power output was switched on.
U<
Alarm: Undervoltage
This error shuts down the power output. An alarm has to be
acknowledged, before the power output can be switched on
again.
U<
Warning: Undervoltage
The error is notified and remains until it is acknowledged
and not persistent anymore.
U<
Signal: Undervoltage
The analogue interface (IF-A1, optional) can signalise an
over- or undervoltage at one of the digital outputs.
0,3
0,2
0,1
0,5
0,4
t[s]
ist
U
60
40
20
100
80
U[%]
>
U
>
U
1
0
T
U>
T
U>
0,3
0,2
0,1
0,5
0,4
t[s]
ist
U
60
40
20
100
80
U[%]
<
U
<
U
1
0
T
0
T
U<
T
U<