User manual

Page 27
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSI 5000 A 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 supervision“.
As a basic principle, all alarm conditions are signalled optically (in the display) and as a readable status via the
digital interface. With most alarms occurring, the DC output of the device is switched off.
3.3.1 Power Fail (only with 640 W models)
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)
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.
3.3.2 Overtemperature
An overtemperature alarm (OT) can occur if an excess temperature inside the device causes the device to stop
supplying power. As soon as the device has cooled down, it will automatically continue to supply power, unless the
user has intervened by switching off the DC output in the meantime. After this, the alarm is not signalled anymore,
but can still be read via digital interface (alarm counter).
3.3.3 Overvoltage protection
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 limit (OVP, 0...110% U
Nom
) or the connected load somehow returns voltage higher than set for the overvolt-
age 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.
3.3.4 Overcurrent protection
An overcurrent alarm (OCP) will switch off the DC output and can occur if:
• The output current in the DC output reaches 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 off the DC output and can occur if:
• the product of the output voltage and output current in the DC output reaches 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.
3.3.6 Remote sensing
An alarm that is indicated only to make the user notice, that
• either the remote sensing is not correctly connected or interrupted (sense bridges on rear, cables to load).
• the max. compensation is reached.