Siemens SIMOTICS S-1FL6 - Page 409

Diagnostics
11.2 List of faults and alarms
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2019, A5E36037884-007
407
Alarm
Cause
Remedy
A7971: Angular commutation
offset determination activated
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
determination.
A7991: Motor data identifica-
tion activated
The motor data identification routine is
activated.
The motor data identification routine is
carried out at the next power-on command.
The alarm automatically disappears after the
motor data identification routine has been
successfully completed.
If a POWER ON or a warm restart is per-
formed with motor data identification selected,
the motor data identification request will be
lost. If motor data identification is required, it
will need to be selected again manually fol-
lowing ramp-up.
A30016: Load supply
switched 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 re-
sponded. The pulsing in this phase is in-
hibited for one pulse period.
• Closed-loop control is incorrectly pa-
rameterized.
• Fault in the motor or in the power ca-
bles.
• The power cables exceed the maxi-
mum permissible length.
• Motor load too high.
• Power unit defective.
Note:
Alarm A30031 is always output if, for a
power unit, the hardware current limiting 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: Encoder 1: Absolute
encoder signals internal
alarms
The absolute encoder fault word includes
alarm bits that have been set.
• Check the encoder cable connection and
make sure the cables are routed in com-
pliance with EMC.
• Check the motor temperature.
• Replace the motor/encoder.
A31412: Error bit set in the
serial protocol
The encoder sends a set error bit via the
serial protocol.
• Carry out a POWER ON (power off/on) for
all components.
• Check that the cables are routed in com-
pliance with EMC.
• Check the plug connections.
• Replace the encoder.