10-9 Trips & Fault Finding
AC30V series Variable Speed Drive
Autotune Alerts
If the autotune fails to complete for any reason, an alert will be displayed and the autotune abandoned. Alerts are as follows:
LEAKAGE L TIMEOUT The autotune has attempted to determine
the leakage inductance of the motor, but
cannot make the required test current.
Problem with motor connection.
MOTOR TURNING ERROR The autotune is trying to find the encoder
direction by spinning the motor, but the
motor is already spinning.
Wait till the motor stops.
NEGATIVE SLIP FREQ Autotune has calculated a negative slip
frequency, which is not valid. Nameplate
rpm may have been set to a value higher
than the base speed of the motor.
Check nameplate rpm, base frequency, and pole pairs
are correct.
TR TOO LARGE The calculated value of rotor time
constant is too large.
Check the values of Nameplate Speed and Base
Frequency.
TR TOO SMALL The calculated value of rotor time
constant is too small.
Check the values of Nameplate Speed and Base
Frequency.
MAX SPEED TOO LOW During Autotune the motor is required to
run at the nameplate speed of the motor.
If 100% Speed in RPM parameter limits
the speed to less than this value, an error
will be reported.
Increase the value of 100% Speed in RPM parameter up
to the nameplate rpm of the motor (as a minimum). It
may be reduced, if required, after the Autotune is
complete.
SUPPLY VOLTS LOW The autotune will compensate for low
supply volts, down to 70% of motor rated
volts. Below this value it will stop the
autotune and raise an alert.
Re-try when mains volts are within specification.
NOT AT SPEED The motor was unable to reach the
required speed to carry out the Autotune.
Possible reasons include: motor shaft not free to turn;
the motor data is incorrect.
MAG CURRENT ERROR It was not possible to find a suitable value
of magnetising current to achieve the
required operating condition for the
motor.
Check the motor data is correct, especially nameplate
rpm and motor volts. Also check that the motor is
correctly rated for the drive.
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