ABB PSTX Series Installation And Commissioning Manual page 163

10.4 Protection indication shown on screen
For a description of the protections, see chapter 7.17 Protections.
Table 2 Protection indication
Status
Electronic overload
Locked rotor
Phase reversal
Current imbalance
Current underload
User defined protection
Ground fault
Overvoltage
Under voltage
Voltage imbalance
External thermal sensor
- PTC protection
- PT100 protection
Possible cause
The motor got an overload
because the current is too high
during some time. (The load on the
motor shaft is too high)
The motor does not run easily.
A possible cause is a damaged
bearing or a load stock.
The phase sequence is not
correct. Current imbalance
between the phases.
Current imbalance between the
phases.
The motor current is below the
specified value.
With the programmable digital
input and an external device/
sensor the user can use his own
specified protection.
Equipment protection. In a
symmetrical 3-phase system, the
sum of the instantaneous line
currents is equal to zero. Ground
fault indicates if the sum differs
more than the specified value. This
can indicate a serious condition of
the motor.
The main voltage is too high
The main voltage is too low.
Voltage imbalance between the
phases.
The external thermal sensor
detected a temperature higher
than the trip level in the motor or
PT100.
1SFC132081M0201 | Installation and commissioning manual | Troubleshooting
Solution
In Line / Inside Delta
At start
• Examine start conditions and EOL settings.
• Examine and correct the reason for the overload.
• Make sure that Current limit level is not set too low.
• Make sure that the ramp time for start is not too long.
• Make sure that correct overload class is used.
• Make sure that parameter Setting Ie is correct.
Continuous run
• Do a check of the rating of the plate for Ie.
• Do a check of the operation voltage.
• Use a motor with more power, and
• a Softstarter rated for higher current.
• Examine and correct the reason for the
• overload.
• Make sure that correct EOL Class is used.
• Examine the bearings of the motor and load.
• Make sure that the load runs easily.
• Change the phase sequence on the line side to (L1-
L2-L3).
• Start the motor again and do a check of the main
currents and voltage.
• Start the motor again and do a check of the main
currents and voltage.
• Examine and correct the reason for the underload.
• Make sure that the motor current parameter (Ie) is set
correctly.
• Set the programmable input signal to inactive state
before you reset the protection event.
• Examine motor cables.
• Examine the motor.
• Do a check of the main voltage.
• Do a check of the main voltage.
• Do a check of the main voltage and start the motor
again.
• Make sure that the PTC or PT100 circuit is closed and
that the inputs are connected.
• Examine and correct the reason for the high
temperature.
• Wait for the temperature of the motor to decrease
sufficiently and start again.
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