Fault
Cause
Remedy
F1912: Clock cycle synchro‐
nous operation sign-of-life
failure
Reaction: OFF1
Acknowledgement: IMMEDI‐
ATELY
The maximum permissible number of er‐
rors in the controller sign-of-life (clock syn‐
chronous operation) has been exceeded in
cyclic operation.
● Physically check the bus (cables,
connectors, terminating resistor, shielding,
etc.).
● Correct the interconnection of the controller
sign-of-life.
● Check whether the controller correctly
sends the sign-of-life.
● Check the permissible telegram failure rate.
● Check the bus and controller for utilization
level (e.g. bus cycle time was set too short).
F7011: Motor overtempera‐
ture
Reaction: OFF2
Acknowledgement: IMMEDI‐
ATELY
● Motor overloaded
● Motor ambient temperature too high
● Wire breakage or sensor not connected
● Motor temperature model incorrectly
parameterized
● Reduce the motor load.
● Check the ambient temperature and the
motor ventilation.
● Check the wiring and the connection.
● Check the motor temperature model
parameters.
F7085: Open-loop/closed-
loop control parameters
changed
Reaction: NONE
Acknowledgement: IMMEDI‐
ATELY
Open-loop/closed-loop control parameters
have had to be changed for the following
reasons:
● As a result of other parameters, they
have exceeded the dynamic limits.
● They cannot be used due to the fact that
the hardware detected not having
certain features.
It is not necessary to change the parameters as
they have already been correctly limited.
F7403: Lower DC link volt‐
age threshold reached
Reaction: OFF1
Acknowledgement: IMMEDI‐
ATELY
The DC link voltage monitoring is active
and the lower DC link voltage threshold was
reached in the "Operation" state.
● Check the line supply voltage.
● Check the infeed.
● Reduce the lower DC link threshold.
● Switch out (disable) the DC link voltage
monitoring.
F7404: Upper DC link volt‐
age threshold reached
Reaction: OFF2
Acknowledgement: IMMEDI‐
ATELY
The DC link voltage monitoring is active
and the upper DC link voltage threshold
was reached in the "Operation" state.
● Check the line supply voltage.
● Check the infeed module or the brake
module.
● Increase the upper DC link voltage
threshold.
● Switch out (disable) the DC link voltage
monitoring.
F7410: Current controller out‐
put limited
Reaction: OFF2
Acknowledgement: IMMEDI‐
ATELY
The condition "I_act = 0 and Uq_set_1 lon‐
ger 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.
● Connect the motor or check the motor
contactor.
● Check the DC link voltage.
● Check the Motor Module.
SINAMICS V70 faults and alarms
7.2 Common faults and alarms
Diagnostics Manual
Diagnostics Manual, 06/2015, 6FC5398-6DP10-0BA2
539
