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EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
www.eps-germany.de
PSB 9000 3U Slave Series
3.4.5 Overpower protection
An overpower alarm (OPP) will switch off the DC terminal and can occur if:
•
the product of the voltage and current in the DC terminal reaches the adjusted OPP limit.
This function serves to protect the connected load application (source mode) or the external source (sink mode)
so that this is not overloaded and possibly damaged due to an excessive power.
3.4.6 Safety OVP
This extra feature is
only built into the 60 V models
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, the alarm could also be trig-
gered by an external source providing an excess voltage to the DC input of the device.
A safety OVP alarm can occur if
•
the voltage on the DC terminal of the device exceeds the rigid threshold 60.6 V.
If the voltage on the DC terminal exceeds that level for any reason, the DC terminal will be switched off and the
alarm will be indicated by LED “Error” on the control panel. This alarm can’t be acknowledged the usual way. It
requires to power-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 higher than expected voltage overshoots when leaving CC mode while I = 0 A.
When remote sensing used, i. e. the rear input “Sense” is connected, the true output voltage
(in source mode) is usually higher, so the Safety OVP could already trigger at voltage settings
lower than 60 V.
