Alarm Conditions; Power Fail; Overtemperature; Overvoltage - Elektro-Automatik EL 9080-170 B Betriebsanleitung

3.3

Alarm conditions

This section only gives an overview about device alarms. What to do in case your device in-
dicates an alarm condition is described in section „3.6 Alarms and monitoring" on page 62.
As a basic principle, all alarm conditions are signalled optically (text + message in the display), acoustically (if
activated), via the digital interface, plus also as status on the analog interface. For later acquisition, an additional
alarm counter can be read from the display or via digital interface.
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)
As soon as a power fail occurs, the device will stop to sink power and switch off the DC input. 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 input after a gone PF alarm can be determined in the MENU. See 3.4.3.
Switching off 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's switched off. This can be ignored.
3.3.2

Overtemperature

An overtemperature alarm (OT) can occur due to an excess temperature inside the device and causes it to stop
sinking power temporarily. After cooling down, the device will automatically continue to supply power, while the
condition of the DC input remains and the alarm doesn't require to be acknowledged.
3.3.3

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 thresh-
old (OVP, 0...103% 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 fitted with protection from external overvoltage and may even be damaged
when not powered.
3.3.4

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.
3.3.5

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.
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
)
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
EL 9000 B Series
www.elektroautomatik.de
ea1974@elektroautomatik.de
Page 42