Fault
Cause
Remedy
F7412: Commutation angle
incorrect (motor model)
Reaction: ENCODER
Acknowledgement: IMMEDI‐
ATELY
An incorrect commutation angle was detec‐
ted that can result in a positive coupling in
the speed controller.
Possible causes:
● The motor encoder is incorrectly
adjusted with respect to the magnet
position.
● 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
activated.
● 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
inductance and stator resistance using the
motor data sheet, measure the stator
resistance, 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 position
identification procedure by means of de-
selection followed by selection.
F7414: Encoder serial num‐
ber changed
Reaction: ENCODER
Acknowledgement: IMMEDI‐
ATELY
1. The encoder was replaced.
2. A third-party, build-in or linear motor
was re-commissioned.
3. The motor with integrated and adjusted
encoder was replaced.
4. The firmware was updated to a version
that checks the encoder serial number.
Re causes 1, 2:
Carry out an automatic adjustment using the
pole position identification routine. Acknowl‐
edge the fault. Initiate the pole position identifi‐
cation routine. Then check that the pole position
identification routine is correctly executed.
SERVO:
If a pole position identification technique is se‐
lected, and if p0301 does not contain a motor
type with an encoder adjusted in the factory,
then p1990 is automatically activated.
Mechanically adjust the encoder. Accept the
new serial number.
Re causes 3, 4:
Accept the new serial number with p0440 = 1.
F7420: Drive: Current set‐
point filter natural frequency
> Shannon frequency
Reaction: NONE
Acknowledgement: IMMEDI‐
ATELY
One of the filter natural frequencies is great‐
er than the Shannon frequency(2KHz).
Filter 1 (p1658, p1660)
Filter 2 (p1663, p1665)
Filter 3 (p1668, p1670)
Filter 4 (p1673, p1675)
● Reduce the numerator or denominator
natural frequency of the current setpoint
filter involved at the control system side.
● Switch out the filter involved (p1656).
F7450: Standstill monitoring
has responded
Reaction: OFF1
Acknowledgement: IMMEDI‐
ATELY
After the standstill monitoring time expired,
the drive left the standstill window.
● Position loop gain too low.
● Position loop gain too high (instability/
oscillation).
● Mechanical overload.
● Connecting cable, motor/drive
converter incorrect (phase missing,
interchange).
Check the causes and resolve.
SINAMICS V70 faults and alarms
7.2 Common faults and alarms
Diagnostics Manual
540
Diagnostics Manual, 06/2015, 6FC5398-6DP10-0BA2
