User Manual

Page 39
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSB 9000 2.5 kW Series
3.4 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 „3.7. Alarms and monitoring“.
As a basic principle, all alarm conditions are signaled optically (text + message in the display) and acoustically
(if activated), as well as status via digital interface. In addition, the alarms are reported as signals on the analog
interface. For later acquisition, an alarm counter can also be shown on display or read via digital interface.
3.4.1 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)
• One or multiple power stages in the device are faulty
Assoonasapowerfailoccurs,thedevicewillstoptosupplyorsinkpowerandswitcho󰀨theDCterminal.The
condition of the DC terminal after a PF alarm occurred during normal operation can be set up. See „3.5.3. Cong-
uration via MENU“, parameter “DC terminal after PF alarm”.
Switching o the device by the mains switch can’t be distinguished from a mains blackout and
thus the device will signalize a PF alarm every time it’s switched o. This can be ignored.
3.4.2 Overtemperature
An overtemperature alarm (OT) can occur from an excess temperature inside the device and temporarily causes
it to switch of the power stage(s). This can occur if the ambient temperature exceeds the maximum ambient tem-
perature rating for the device. After cooling down, the device can automatically switch the power stage back on,
depending on the setting of parameter “DC terminal after OT alarm”. See section 3.5.3.1.
3.4.3 Overvoltage protection
Anovervoltagealarm(OVP)willswitcho󰀨theDCpowerstageandcanoccurif:
• the device itself, when running in source mode, or an external source (in sink mode) brought a voltage to the
DC terminal higher than set for the overvoltage alarm threshold (OVP, 0...110% U
Nom
) or the connected load
somehow returns voltage higher than this threshold
• the OVP threshold has been adjusted too close above the output voltage in source mode and if the device is in
CC regulation mode and 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 acoustically or optically that the device probably has generated or experienced
an excessive voltage which could damage the connected load application or the device.
• Thedeviceisn’tttedwithprotectionfromexternalovervoltageandcouldevenbedam-
aged when not powered
• The changeover from operation modes CC -> CV in source mode can cause voltage
overshoots
3.4.4 Overcurrent protection
Anovercurrentalarm(OCP)willswitcho󰀨theDCpowerstageandcanoccurif:
• the current in the DC terminal reaches the adjusted OCP limit.
This function serves to protect the connected load application (source mode) or the external source (sink mode)
so it this isn’t overloaded and possibly damaged due to an excessive current.
3.4.5 Overpower protection
Anoverpoweralarm(OPP)willswitcho󰀨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 isn’t overloaded and possibly damaged due to an excessive power.