© EA Elektro-Automatik in 2022, this information is subject to change without notice
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06230920_manual_ps_10000_3u_15kw_en_01
3.3
Alarm conditions
This section only gives an overview about device alarms. What to do in case your device indicates an
alarm condition is described in section “3.6. Device alarm handling“.
As a basic principle, all alarm conditions are signaled optically (text + message in the display), acoustically (if activated) and
as a readable status and alarm counter via the digital interface. In addition, the alarms OT and OVP are reported as signals
on the analogue interface. For later acquisition, an 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)
•
Defect in the input circuit (PFC)
As soon as a power fail occurs, the device will stop to supply or sink power and switch off the DC output. In case the power
fail was an undervoltage and is gone later on, the device can continue to work as before, but this depends on a parameter in
the settings menu called
DC output -> State after PF alarm
. The default setting would keep the DC output switched off, but
leave the alarm in the display for notification.
Powering the device down (power switch) can’t be distinguished from a supply blackout and thus the
device will signalize a PF alarm every time it’s switched off. This can be ignored.
3.3.2
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 is usually due to the ambient temperature exceeding the specified operating temperature range
of the device. After cooling down, the device can automatically switch the DC terminal back on, depending on the setting of
parameter
DC output -> State after OT alarm
. Also see section
3.4.3.1 for more information. The alarm will remain in the
display as notification and can be cleared anytime.
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 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. If the device is in CC mode and if it then experi-
ences 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 isn’t fitted with protection from external overvoltage
•
The changeover from operation modes CC -> CV can generate voltage overshoots
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 isn’t 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 isn’t overloaded and possibly damaged due to an
excessive power consumption.
