User Manual

Page 37
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
ELR 9000 Series
3.2.5 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 „3.5. Alarms and monitoring“.
As a basic principle, all alarm conditions are signalled optically (Text + message in the display), acoustically (if
activated) and as a readable status via the digital interface. With any alarm occurring, the DC input of the device
is switched off. In addition, the alarms OT and OVP are reported as signals on the analogue interface.
3.2.5.1 Power Fail
Power Fail (PF) indicates an alarm condition which may have various causes:
• AC input voltage too high (mains overvoltage)
• AC input voltage too low (mains undervoltage, mains failure)
• Defect in the input circuit (PFC)
• Not all required AC input phases are connected (see „2.3.4. Mains connection (AC)“ for requirements)
Switching off the device by the mains switch can not be distinguished from a mains blackout
and thus the device will signalise a PF alarm every time the device is switched off. This can
be ignored.
3.2.5.2 Overtemperature
An overtemperature alarm (OT) can occur if an excess temperature inside the device causes to switch off the
DC input. This alarm condition is shown as the message “Alarm: OT” in the display. In addition, the condition will
be passed as a signal to the analog interface where it can also be read as an alarm code, as well as alarm code
which can be read via digital interface.
An OT alarm has a lower priority than an OV alarm (overvoltage). If an OV alarm occurs during
an OT alarm, then the message “OT” will be overwritten by “OV”
3.2.5.3 Overvoltage
An overvoltage alarm (OVP) will switch off the DC input and can occur if:
• the connected voltage source provides a higher voltage to the DC input than set in the overvoltage alarm limits
(OVP, 0...110% U
NOM
)
This function serves to warn the user of the electronic load acoustically or optically that the connected voltage
source has generated an excessive voltage and thereby could damage or even destroy the input circuit and other
parts of the device.
The device is not tted with protection from external overvoltage.
3.2.5.4 Overcurrent
An overcurrent alarm (OCP) will switch off the DC input and can occur if:
• The input current in the DC input exceeds the adjusted OCP limit.
This function serves to protect the voltage and current source so that this is not overloaded and possibly damaged,
rather than offering protection to the electronic load.
3.2.5.5 Overpower
An overpower alarm (OPP) will switch off the DC input and can occur if:
• the product of the input voltage and input current in the DC input exceeds the adjusted OPP limit.
This function serves to protect the voltage and current source so that this is not overloaded and possibly damaged,
rather than offering protection to the electronic load.