Siemens SIMOTICS S-1FL6 - Page 392

Diagnostics
11.2 List of faults and alarms
SINAMICS V90, SIMOTICS S-1FL6
390 Operating Instructions, 04/2019, A5E36037884-007
Fault
Cause
Remedy
F7412: Commutation angle
incorrect (motor model)
Reaction: ENCODER
Acknowledgement:
IMMEDIATELY
An incorrect commutation angle was de-
tected that can result in a positive coupling
in the speed controller.
Possible causes:
• The motor encoder is incorrectly ad-
justed with respect to the magnet posi-
tion.
• The motor encoder is damaged.
• Data to calculate the motor model has
been incorrectly set.
• Pole position identification might have
calculated an incorrect value when ac-
tivated.
• The motor encoder speed signal is
faulted.
• The control loop is instable due to
incorrect parameterization.
• If the encoder mounting was changed, re-
adjust the encoder.
• Replace the defective motor encoder.
• Correctly set the motor stator resistance,
cable resistance and motor-stator leakage
inductance.
Calculate the cable resistance from the
cross-section and length, check the in-
ductance and stator resistance using the
motor data sheet, measure the stator re-
sistance, e.g. using a multimeter - and if
required, again identify the values using
the stationary motor data identification.
• With pole position identification activated,
check the procedure for pole position
identification and force a new pole posi-
tion identification procedure by means of
de-selection followed by selection.
F7420: Drive: Current set-
point filter natural frequency >
Shannon frequecy
One of the filter natural frequencies is
greater than the Shannon frequency.
• Reduce the numerator or denominator
natural frequency of the current setpoint
filter involved.
• Switch out the filter involved (p1656).
F7430: Changeover to open-
loop torque controlled opera-
tion not possible
Reaction: OFF2
Acknowledgement: POWER
ON
For encoderless operation, the converter
cannot change over to closed-loop torque-
controlled operation.
• Do not attempt to change over to closed-
loop torque-controlled operation.
• Check the encoder cable connection.
F7431: Changeover to en-
coderless operation not pos-
sible
Reaction: OFF2
Acknowledgement: POWER
ON
For closed-loop torque control, the con-
verter cannot change over to encoderless
operation.
• Do not attempt to change over to encoder-
less operation.
• Check the encoder cable connection.