Page 45
EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
www.eps-germany.de
PSI 10000 4U Serie
3.3.6
Safety OVP
This extra feature is only built into the
60 V model
of this series. Similar to the regular overvoltage protection (OVP,
see
), the Safety OVP is supposed to protect the application or people according to SELV. The alarm shall
prevent the device from providing an output voltage higher than 60 V. However, it could also be triggered by an
external source providing an excess voltage to the DC output of the device.
A safety OVP alarm can occur if
•
the voltage on the DC of the device reaches the rigid threshold of 60.6 V.
If the voltage on the DC output exceeds that level for any reason, the DC output will be switched off and alarm
“Safety OVP” will be indicated in the display. This alarm can’t be acknowledged the usual way. It requires to pow
-
er-cycle the unit.
During normal operation of the power supply, this alarm should not trigger. There are, however,
situations which can trigger the alarm, like when working with voltages close to the threshold of
60.6 V or voltage spikes when leaving CC mode when the current was 0 A before.
When remote sensing is used, i. e. the rear input “Sense” is connected, the true output voltage
is higher than the adjusted value so the Safety OVP could already trigger at voltage settings
lower than 60 V.
3.3.7
Share bus fail
A Share bus fail alarm (short: SF) will switch off the DC power stage and can occur if:
•
the Share bus connectors of at least two units are already wired while at least one unit isn’t yet configured for
master-slave
•
a short-circuit on the Share bus has occurred, for example due to a damaged BNC cable.
This function serves to prevent sending irregular control signals to the slave units via the Share bus or to cause
them to react differently. This alarm has to be acknowledged after the cause has been removed.