ABB PSTX85 - Page 163

1SFC132081M0201 | Installation and commissioning manual | Troubleshooting 163
10.4 Protection indication shown on screen
For a description of the protections, see chapter 7.17 Protections.
Table 2 Protection indication
Status Possible cause Solution
Electronic overload The motor got an overload
because the current is too high
during some time. (The load on the
motor shaft is too high)
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.
Locked rotor The motor does not run easily.
A possible cause is a damaged
bearing or a load stock.
• Examine the bearings of the motor and load.
• Make sure that the load runs easily.
Phase reversal The phase sequence is not
correct. Current imbalance
between the phases.
• 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.
Current imbalance
Current imbalance between the
phases.
• Start the motor again and do a check of the main
currents and voltage.
Current underload The motor current is below the
specified value.
• Examine and correct the reason for the underload.
• Make sure that the motor current parameter (Ie) is set
correctly.
User defined protection With the programmable digital
input and an external device/
sensor the user can use his own
specified protection.
• Set the programmable input signal to inactive state
before you reset the protection event.
Ground fault 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.
• Examine motor cables.
• Examine the motor.
Overvoltage The main voltage is too high • Do a check of the main voltage.
Under voltage The main voltage is too low.
• Do a check of the main voltage.
Voltage imbalance Voltage imbalance between the
phases.
• Do a check of the main voltage and start the motor
again.
External thermal sensor
- PTC protection
- PT100 protection
The external thermal sensor
detected a temperature higher
than the trip level in the motor or
PT100.
• 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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