Siemens SINAMICS V90 Operating Instructions Manual page 332

Diagnostics
11.2 List of faults and alarms
Fault
F7412: Commutation angle
incorrect (motor model)
Reaction: ENCODER
Acknowledgement:
IMMEDIATELY
F7420: Drive: Current set-
point filter natural frequency >
Shannon frequecy
F7430: Changeover to open-
loop torque controlled opera-
tion not possible
Reaction: OFF2
Acknowledgement: POWER
ON
F7431: Changeover to en-
coderless operation not pos-
sible
Reaction: OFF2
Acknowledgement: POWER
ON
332
Cause
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.
One of the filter natural frequencies is
greater than the Shannon frequency.
For encoderless operation, the converter
cannot change over to closed-loop torque-
controlled operation.
For closed-loop torque control, the con-
verter cannot change over to encoderless
operation.
Remedy
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.
Reduce the numerator or denominator
•
natural frequency of the current setpoint
filter involved.
Switch out the filter involved (p1656).
•
Do not attempt to change over to closed-
•
loop torque-controlled operation.
Check the encoder cable connection.
•
Do not attempt to change over to encoder-
•
less operation.
Check the encoder cable connection.
•
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2016, A5E36037884-002