10.4 Protection indication shown on screen
For Protections description, see chapter 7.19 Protections group 0-6.
Table 2 Protection indication
Status Possible cause Solution
EOL Protection The motor has been exposed to
an overload condition because the
current over a certain time is too
high. (The load on the motor shaft
is too high)
In Line / Inside Delta
At start
• Check starting conditions and EOL settings.
• Check and correct the reason for the overload.
• Check that Current limit level is not set too low.
• Check that the ramp time for start is not too long.
• Check that correct overload class is used.
• Check that parameter Setting I
e
is correct.
Continuous run
• Check the rating of the plate for Ie.
• Check operational voltage.
• Chose a motor with more power, and
a softstarter rated for higher current.
• Check and correct the reason for the
overload.
• Check that correct EOL Class is used.
Locked rotor protection The motor is running stiff by some
reason. A damaged bearing or a
stucked load could be possible
causes.
• Check the bearings of the motor and load.
• Check that the load is not running stiff.
Phase reversal protection The phase sequence is not
correct. Current imbalance
between the phases.
• Change the phase sequence on the line side to (L1-
L2-L3).
• Restart the motor and check the main currents and
voltage.
Current imbalance protection Current imbalance between the
phases.
• Restart the motor and check the main currents and
voltage.
Over voltage protection The main voltage is to high. • Check the main voltage.
Under voltage protection The main voltage is to low. • Check the main voltage.
Earth fault protection Equipment protection. In a
symmetrical three phase system,
the sum of the instantaneous line
currents is equal to zero. Earth
fault indicates if the sum differs
more than a settable value. This
can indicate a serious condition of
the motor.
• Check motor cables.
• Check the motor.
Voltage imbalance protection Voltage imbalance between the
phases.
• Check the main voltage and restart the motor.
Voltage outputs protection The 24V voltage outputs has been
overloaded or shorted.
• Check the connections.
External thermal sensor
- PTC protection
- PT100 protection
The external thermal sensor has
detected a temperature higher
than the trip level in the motor or
PT100.
• Check the root cause of the over heating.
• Check that the PTC or PT100 circuit is closed and
that the inputs are connected.
• Check and correct the reason for the over
temperature.
• Wait for the motor to cool sufficiently and restart.
Power factor underload protection The power factor has fallen below
the normal level.
• Check and correct the reason for the underload.
10
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