User manual

Page 31
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PS 3000 C 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 signalled optically (text + message in the display) and acoustically (if
activated), as well status and alarm counter readable via an optional, digital interface. In addition, the alarms OT,
PF and OVP are reported as signals on the optional, analogue interface. For later acquisition, the alarm counter
can also be shown on display.
3.3.1 Power Fail
Power Fail (PF) indicates an alarm condition which may have various causes:
• AC input voltage too low (mains undervoltage, mains failure)
• Defect in the input circuit (PFC)
Assoonasapowerfailoccurs,thedevicewillstoptosupplypowerandswitchotheDCoutput.Incasethe
power fail was an undervoltage and is gone later on, the alarm will vanish from display and doesn’t require to be
acknowledged.
The condition of the DC output after a gone PF alarm can be determined in the MENU. See 3.4.3.
Switching o the device with the power switch can not be distinguished from a mains blackout
and thus the device will signalise a PF alarm every time it is switched o. This can be ignored.
3.3.2 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 or due to excessive
ambient temperature.
After cooling down, the device will automatically continue to work, while the condition of the DC output remains
and the alarm doesn’t require to be acknowledged.
3.3.3 Overvoltage
Anovervoltagealarm(OVP)willswitcho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 acoustically or optically that the device probably has
generated an excessive voltage which could damage the connected load application.
• Thedeviceisnotttedwithprotectionfromexternalovervoltage
• The changeover from operation mode CC -> CV can generate voltage overshoots
3.3.4 Overcurrent protection
Anovercurrentalarm(OCP)willswitchotheDCoutputandcanoccurif
• the output current in the DC output exceeds the adjusted OCP limit.
This function serves to protect the connected load application so that this is not overloaded and possibly damaged
due to an excessive current.
3.3.5 Overpower protection
Anoverpoweralarm(OPP)willswitchotheDCoutputandcanoccurif
• the product of the output voltage and output current in the DC output exceeds the adjusted OPP limit.
This function serves to protect the connected load application so that this is not overloaded and possibly damaged
due to an excessive power consumption.