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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PSB 9000 3U Series
3.4.6
Safety OVP
Similar to the regular overvoltage protection (OVP, see
), the Safety OVP is supposed to protect the applica-
tion or people according to SELV. A safety OVP alarm can occur if
•
the output voltage of the device exceeds a threshold of 60.6 V.
This extra feature is
only built into the 60 V models
of this series and has a rigid threshold of 101% of the rated
voltage, i. e. 60.6 V. If the output voltage 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 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 voltage 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.
