Siemens SINAMICS V90 Operating Instructions Manual page 278

Diagnostics
12.1 List of faults and alarms
Fault
F7410: Current controller
output limited
Message class: Applica-
tion/technological function
faulty (17)
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
F7412: Commutation angle
incorrect (motor model)
Message class: Actual posi-
tion/speed value incorrect or
not available (11)
Reaction: ENCODER
Acknowledgement:
IMMEDIATELY
F7420: Drive: Current set-
point filter natural frequency >
Shannon frequecy
Message class: Error in the
parameteriza-
tion/configuration/commission
ing procedure (18)
F7442: LR: Multiturn does not
match the modulo range
Message class: Error in the
parameteriza-
tion/configuration/commission
ing procedure (18)
Reaction: OFF1 (OFF2,
OFF3)
Acknowledgement:
IMMEDIATELY
278
Cause
The condition "I_act = 0 and Uq_set_1
longer than 16 ms at its limit" is present
and can be caused by the following:
Motor not connected or motor contactor
•
open.
No DC link voltage present.
•
Motor Module defective.
•
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.
The ratio between the multiturn resolution
and the modulo range (p29246) is not an
integer number. This results in the adjust-
ment being set back, as the position actual
value cannot be reproduced after power-
off/power-on.
Remedy
Connect the motor or check the motor
•
contactor.
Check the DC link voltage.
•
Check the Motor Module.
•
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).
•
Make the ration between the multiturn resolu-
tion and the modulo range an integer number.
The ratio v is calculated as follows:
Motor encoder without position tracking
•
(p29243 = 0):
– For multiturn encoders:
v = (4096 * p29247 * p29248)/(p29249 *
p29246)
– For singleturn encoders:
v = (p29247 * p29248)/(p29249 * p29246)
Motor encoder with position trakcing
•
(p29243 = 1):
v = (p29244 * 29247)/p29246
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2017, A5E37208830-003