Elektro-Automatik 39 200 120, Руководство по эксплуатации

Страница: 18 / 28

Page 18
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
ea1974@elektroautomatik.de
PS 2000 B Triple Series
3.3 Alarm conditions
This section only gives an overview about device alarms. What to do in case your device indi-
cates an alarm condition is described in section «3.6. Alarms and monitoring».
As a basic principle, all alarm conditions are signaled optically (text in the display), as well as status readable via
the digital interface.
3.3.1 Overtemperature
An overtemperature alarm (OT) can occur from an excess temperature inside the device and causes it to stop
supplying power temporarily. This can occur due to a defect of the internal fan regulation (320 W models only) or
due to excessive ambient temperature.
After cooling down, the device will automatically continue to work, while the previous condition of the DC output
remains and the alarm doesn’t require to be acknowledged.
3.3.2 Overvoltage
An overvoltage alarm (OVP) will switch off the DC output and can occur if
•
the power supply itself, as a voltage source, generates an output voltage higher than set for the overvoltage
alarm threshold (OVP, 0...110% U
Nom
) or the connected load somehow returns voltage higher than set for the
overvoltage alarm limit.
•
the OV threshold has been adjusted too close above the output voltage. If the device is in CC mode and if it
then experiences a negative load step, it will make the voltage rise quickly, resulting in an voltage overshoot for
a short moment which can already trigger the OVP.
This function serves to warn the user of the power supply that the device has probably generated an excessive
voltage which could damage the connected load application.
• The device isn’t fitted with protection from external overvoltage
• The changeover from operation mode CC -> CV can generate voltage overshoots
3.3.3 Overcurrent protection
An overcurrent alarm (OCP) will switch off the DC output and can occur if
• the actual current in the DC output exceeds the adjusted OCP limit.
This function serves to protect the connected load application so that this isn’t overloaded and possibly damaged
due to an excessive current.