ABB PSTX30 Installation And Commissioning Manual page 138

10.4 Protection indication shown on screen
For Protections description, see chapter 7.19 Protections group 0-6.
Table 2 Protection indication
Status
EOL Protection
Locked rotor protection
Phase reversal protection
Current imbalance protection
Over voltage protection
Under voltage protection
10
Earth fault protection
Voltage imbalance protection
Voltage outputs protection
External thermal sensor
- PTC protection
- PT100 protection
Power factor underload protection
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Possible cause
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)
The motor is running stiff by some
reason. A damaged bearing or a
stucked load could be possible
causes.
The phase sequence is not
correct. Current imbalance
between the phases.
Current imbalance between the
phases.
The main voltage is to high.
The main voltage is to low.
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.
Voltage imbalance between the
phases.
The 24V voltage outputs has been
overloaded or shorted.
The external thermal sensor has
detected a temperature higher
than the trip level in the motor or
PT100.
The power factor has fallen below
the normal level.
Solution
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.
• Check the bearings of the motor and load.
• Check that the load is not running stiff.
• Change the phase sequence on the line side to (L1-
L2-L3).
• Restart the motor and check the main currents and
voltage.
• Restart the motor and check the main currents and
voltage.
• Check the main voltage.
• Check the main voltage.
• Check motor cables.
• Check the motor.
• Check the main voltage and restart the motor.
• Check the connections.
• 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.
• Check and correct the reason for the underload.