A7576: Encoderless opera‐
tion due to a fault active
Encoderless operation is active due to a
fault.
● Remove the cause of a possible encoder
fault.
● Carry out a POWER ON (power off/on) for
all components.
A7965: Save required
The angular commutation offset was re-de‐
fined and has still not been saved.
In order to permanently accept the new val‐
ue, it must be saved in a non-volatile fash‐
ion.
This alarm automatically disappears after the
data has been saved.
A7971: Angular commuta‐
tion offset determination acti‐
vated
The automatic determination of the angular
commutation offset (encoder adjustment) is
activated.
The automatic determination is carried out
at the next power-on command.
The alarm automatically disappears after deter‐
mination.
A7991: Motor data identifica‐
tion activated
The motor data identification routine is ac‐
tivated.
The motor data identification routine is car‐
ried out at the next power-on command.
The alarm automatically disappears after the
motor data identification routine has been suc‐
cessfully completed.
If a POWER ON or a warm restart is performed
with motor data identification selected, the mo‐
tor data identification request will be lost. If mo‐
tor data identification is required, it will need to
be selected again manually following ramp-up.
A30016: Load supply switch‐
ed off
The DC link voltage is too low.
● Switch on the load supply.
● Check the line supply if necessary.
A30031: Hardware current
limiting in phase U
Hardware current limit for phase U respon‐
ded. The pulsing in this phase is inhibited
for one pulse period.
● Closed-loop control is incorrectly
parameterized.
● Fault in the motor or in the power cables.
● The power cables exceed the maximum
permissible length.
● Motor load too high.
● Power unit defective.
Note:
Alarm A30031 is always output if, for a
Power Module, the hardware current limit‐
ing of phase U, V or W responds.
Check the motor data. As an alternative, run a
motor data identification.
● Check the motor circuit configuration (star-
delta).
● Check the motor load.
● Check the power cable connections.
● Check the power cables for short-circuit or
ground fault.
● Check the length of the power cables.
A31411: Absolute encoder
signals internal alarms
The absolute encoder fault word includes
alarm bits that have been set.
Replace the encoder.
SINAMICS V70 faults and alarms
7.2 Common faults and alarms
Diagnostics Manual
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Diagnostics Manual, 06/2015, 6FC5398-6DP10-0BA2
