User manual

48
© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
EN
© 2009, Elektro-Automatik GmbH & Co. KG
Using the power supply
7.6.2 Voltage supervision
U thresholds +
The menu pageU thresholds letsyou congure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 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 „6.13 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notiedwitheitheranalarm,
awarningorasignalandafteradenable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dened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notied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notiedaftertheresponsetime
Tu<. The
notication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 ack-
nowledged, before the power output can be switched on again.
 U< Warning: Undervoltage
Theerrorisnotiedandremainsuntilitisacknowledgedandnot
persistent anymore.
U< Signal: Undervoltage
The analogue interface (IF-A1, optional) can signalise an under-
voltage at one of the digital outputs.