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250 Unidrive M702 User Guide
Issue Number: 3
Autotune 2 Position feedback direction incorrect
12
The drive has tripped during a rotating autotune. The cause of the trip can be identified from the associated sub-trip number.
Recommended actions:
• Check motor cable wiring is correct
• Check feedback device wiring is correct
• Swap any two motor phases
Autotune 3 Measured inertia has exceeded the parameter range or commutation signals changed in wrong direction
13
The drive has tripped during a rotating autotune or mechanical load measurement test. The cause of the trip can be
identified from the associated sub-trip number.
Recommended actions:
• Check motor cable wiring is correct
• Check feedback device U,V and W commutation signal wiring is correct
Autotune 4 Drive encoder U commutation signal fail
14
A position feedback device with commutation signals is being used (i.e. AB Servo, FD Servo, FR Servo, SC Servo, or
Commutations only encoder) and the U commutation signal did not change during a rotating autotune.
Recommended actions:
• Check feedback device U commutation signal wiring is correct (Encoder terminals 7 and 8)
Autotune 5 Drive encoder V commutation signal fail
15
A position feedback device with commutation signals is being used (i.e. AB Servo, FD Servo, FR Servo, SC Servo, or
Commutations only encoder) and the V commutation signal did not change during a rotating autotune.
Recommended actions:
• Check feedback device V commutation signal wiring is correct (Encoder terminals 9 and 10)
Autotune 6 Drive encoder W commutation signal fail
16
A position feedback device with commutation signals is being used (i.e. AB Servo, FD Servo, FR Servo, SC Servo, or
Commutations only encoder) and the W commutation signal did not change during a rotating autotune.
Recommended actions:
• Check feedback device W commutation signal wiring is correct (Encoder terminals 11 and 12)
Autotune 7 Motor number of poles / position feedback resolution set incorrectly
17
An Autotune 7 trip is initiated during a rotating autotune, if the motor poles or the position feedback resolution have been
set up incorrectly where position feedback is being used.
Recommended actions:
• Check line per revolution for feedback device
• Check the number of poles in Pr 05.011
Autotune Stopped Autotune test stopped before completion
18
The drive was prevented from completing an autotune test, because either the drive enable or the drive run were removed.
Recommended actions:
• Check the drive enable signal (Terminals 11 and 13) was active during the autotune
• Check the run command was active in Pr 08.005 during autotune
Brake R Too Hot
Braking resistor overload timed out (I
2
t)
19
The Brake R Too Hot indicates that braking resistor overload has timed out. The value in Braking Resistor Thermal
Accumulator (10.039) is calculated using Braking Resistor Rated Power (10.030), Braking Resistor Thermal Time Constant
(10.031) and Braking Resistor Resistance (10.061). The Brake R Too Hot trip is initiated when Braking Resistor Thermal
Accumulator (10.039) reaches 100 %.
Recommended actions:
• Ensure the values entered in Pr 10.030, Pr 10.031 and Pr 10.061 are correct
• If an external thermal protection device is being used and the braking resistor software overload protection is not
required, set Pr 10.030, Pr 10.031 or Pr 10.061 to 0 to disable the trip.
Trip Diagnosis
Sub-trip Reason
1
The position feedback direction is incorrect when position feedback is being used during a rotating autotune
2 The motor did not reach the required speed during rotating autotune or mechanical load measurement.
Sub-trip Reason
1 Measured inertia has exceeded the parameter range during a mechanical load measurement
2 The commutation signals changed in the wrong direction during a rotating autotune
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