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Unidrive M100 / M101 Control User Guide 93
Issue Number: 1
rS Measured resistance has exceeded the parameter range
33
The rS trip indicates that the measured stator resistance of the motor during an autotune test has exceeded the maximum
possible value of Stator Resistance (05.017).
If the measured value or a value written to this parameter by the user exceeds (V
FS/2) / Full Scale Current Kc (11.061),
where V
FS is the full scale DC bus voltage then this trip is initiated.
The stationary autotune is initiated using the autotune function (Pr 05.012) or in open loop vector mode (Pr 05.014) on the
first run command after power up in mode 4 (Ur_I) or on every run command in modes 0 (Ur_S) or 3 (Ur_Auto). This trip
can occur if the motor is very small in comparison to the rating of the drive.
If the value is the result of a measurement made by the drive then sub-trip 0 is applied, or if it is because the parameter has
been changed by the user then sub-trip 3 is applied. During the stator resistance section of auto-tuning an additional test is
performed to measure the drive inverter characteristics to provide the compensation necessary for dead-times. If the
inverter characteristic measurement fails then sub-trip 2 is applied.
The reason for the trip can be identified by the sub-trip number.
Recommended actions:
• Check that a value has not been entered in the stator resistance for the presently selected motor map that exceeds the
allowed range.
• Check the motor cable / connections
• Check the integrity of the motor stator winding using a insulation tester
• Check the motor phase to phase resistance at the drive terminals
• Check the motor phase to phase resistance at the motor terminals
• Ensure the stator resistance of the motor falls within the range of the drive model
• Select fixed boost mode (Pr 05.014 = Fd) and verify the output current waveforms with an oscilloscope
• Replace the motor
So.St Soft start relay failed to close, soft start monitor failed
226
The So.St trip indicates that the soft start relay in the drive failed to close or the soft start monitoring circuit has failed.
The cause of the trip can be identified by the sub-trip number.
Recommended actions:
• Hardware fault – Contact the supplier of the drive
St.HF Hardware trip has occurred during last power down
221
The St.HF trip indicates that a hardware trip (HF01 –HF18) has occurred and the drive has been power cycled. The sub-trip
number identifies the HF trip.
Recommended actions:
• Enter 1299 in Pr mm.000 and press reset to clear the trip
Sto No Safe Torque Off board fitted
234
Internal STO board not fitted correctly
Recommended actions:
Hardware fault – Contact the supplier of the drive
th.br Brake resistor over temperature
10
The th.br trip is initiated if the hardware based braking resistor thermal monitoring is connected and the resistor overheats.
If the braking resistor is not used, then this trip must be disabled with bit 3 of Action On Trip Detection (10.037) to prevent
this trip.
Recommended actions:
• Check brake resistor wiring
• Check braking resistor value is greater than or equal to the minimum resistance value
• Check braking resistor insulation
Trip Diagnosis
Sub-trip Reason
0
Stator resistance (5.017) test failed during Autotune or measured stator resistance value is out of
range.
1 Reserved
2
Transient inductance (5.024) test failed during Autotune or measured stator resistance value is out
of range.
3 The value of Stator Resistance (05.017) is too large when the parameter is edited.
4
Stator resistance (5.017) test successful during Autotune but Pr 05.017 is too large for this drive
current and voltage rating.
Sub-trip Reason
1 Soft-start failure
2 DC bus capacitor failure on 110 V drive
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