Function Overview
Protection Function voltage Available Options:
Automatic Fault
Reset Possible
Overvoltage:
The highest value of the three phases is above a given
threshold.
The warning - and trip thresholds as well as the according
delays can be set.
Motor running
Motor stopped
Not in test position
Trip, Warning, Off -
Undervoltage:
The lowest value of the three phases is below a given
threshold.
The warning - and trip thresholds as well as the according
delays can be set.
Motor running
Motor stopped
Not in test position
Trip, Warning, Off -
Voltage Dip:
Low voltage situation which requires an
autonomous load sheeding
handling should take place in the UMC.
After motor start
Not in test position
Reaction depends on Dip
duration.
-
Phase loss:
In opposite to the current based phase loss protection
function this function detects a missing phase also in the
case the motor is stopped.
A warning / trip can be signalled before the motor is actually
started i.e. to detect a blown fuse.
Motor running
Motor stopped
Not in test position
Trip, Warning, Off
-
Voltage imbalance:
This function can be used to detect smaller voltage
imbalances between the phases.
Warning - and trip thresholds as well as warning - and trip
delays can be set.
Motor running
Motor stopped
Not in test position
Trip, Warning, Off Yes, see parameter
'Fault auto reset'
Total harmonic distortion:
This function measures harmonic distortions in the
connected mains.
Motor running
Motor stopped
Not in test position
Warning -
Overload:
The active power drawn by the motor is too high. The
warning - and trip thresholds as well as the according delays
can be set.
After load start
Not in test position
Trip, Warning, Off -
Underload:
The active power drawn by the motor is too low. The
warning - and trip thresholds as well as the according delays
can be set.
After load start
Not in test position
Trip, Warning, Off -
Cos phi:
A measure of the phase angle between voltage and current.
The warning - and trip thresholds as well as the according
delays can be set.
After load start
Not in test position
Trip, Warning, Off -
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