Standard programposi features 75
An autophasing fault (3385 Autophasing) can occur with a running motor if the
estimated angle of the motor differs too much from the measured angle. This could
be caused by, for example, the following:
• The encoder is slipping on the motor shaft
• An incorrect value has been entered into 98.15 Position offset user
• The motor is already turning before the autophasing routine is started
• Turning mode is selected in 21.13 Autophasing mode but the motor shaft is
locked
• Turning with Z-pulse mode is selected in 21.13 Autophasing mode but no zero
pulse is detected within a revolution of the motor
• The wrong motor type is selected in 99.03 Motor type
• Motor ID run has failed.
Settings
See parameters
• 21.13 Autophasing mode
• 98.15 Position offset user
• 99.13 ID run requested
Flux braking
The drive can provide greater deceleration by raising the level of magnetization in the
motor. By increasing the motor flux, the energy generated by the motor during
braking can be converted to motor thermal energy.
During flux braking, the drive monitors the motor status continuously. Therefore, flux
braking is used both for stopping the motor and for changing the speed. The other
benefits of flux braking are:
• The braking starts immediately after a stop command is given. The function does
not need to wait for the flux reduction before it can start the braking.
T
Br
T
N
20
40
60
(%)
Motor
speed
No flux braking
Flux braking
T
Br
= Braking torque
T
N
= 100 Nm
Flux braking
No flux braking
t (s)
f (Hz)
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