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:
Alert message
Possible Cause
Remedy
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.
