58
EN
Operating Guide
PSI 8000 2U Series
Date: 28-06-2012
Using the power supply
Overcurrent supervision
I>
Default:
I
Nom
=
{ I<… I
nom
}
Ti>
Default:
100ms
=
{ 0…99:59h}
The overcurrent error is signalised after the response time
Ti>
, if the actual value of the current falls below the adjusted
overcurrent limit. The error notification vanishes if the actual
current has exceeded the threshold again for the time
Ti>
.
This overcurrent error is suppressed for T
0
= 100ms after the
output was switched on.
I>
Alarm: Overcurrent
This error shuts down the power output. An alarm has to be ack-
nowledged, before the power output can be switched on again.
I>
Warning: Overcurrent
The error is notified and remains until it is acknowledged and
not persistent anymore.
I>
Signal: Overcurrent
The analog interface (IF-A1, optional) can signalise an overcur-
rent or undercurrent at one of the digital outputs.
7.6.3 Step response supervision
Step re
The menu page
Step response
lets you configure the
supervision circuits for the dynamic and static comparison of
actual value and set value.
Step response:
Default:
U
→
Uo
Us
→
Uo
Supervision of the deviance between set
value and actual value of voltage
Is
→
Io
Supervision of the deviance between set
value and actual value of current
Supervise
Default:
NO
NO
Supervision is inactive
Signal
Supervision reports a signal
Warning
Supervision reports a warning
Alarm
Supervision reports a alarm
dyn.
∆
Default:
10%
= ±8.00V
Allowed tolerance for the voltage
= ±5.00A
Allowed tolerance for the current
The settling process of the power supply is determined by the
load. After a set value has changed, a certain time elapses until
the desired value is put to the power output. For instance, it
can last some seconds for the voltage to go down from 100%
to 0V at no-load operation, because the output capacitors need
a certain time to discharge.
Supervision of a step response
The adjusted set value is compared with the measured actual
value. If there is a difference between them and this difference
is greater than the tolerance, the supervision will initiate an error
after the settling time
Tsr
. See figure below.
rise time
Tsr =
{0…99:59h}
Default:
100ms
fall time
Tsf =
{0…99:59h}
Default:
2s
