Fault and warning codes
SINAMICS V20 Inverter
242 Operating Instructions, 07/2012, A5E03728167
Alarm Cause Remedy
If warning A910 occurs while the
inverter is in standby (output pulses
disabled) and an ON command is
subsequently given, the Vdc_max
controller (A911) will not be activated
unless warning A910 is rectified.
A911
Vdc_max controller active
The Vdc_max controller works to keep
the DC-link voltage (r0026) below the
level specified in r1242.
Check the following:
• Supply voltage must lie within limits indicated on
rating plate.
• Ramp-down time (P1121) must match inertia of
load.
Note:
Higher inertia requires longer ramp times;
otherwise, apply braking resistor.
A912
Vdc_min controller active
The Vdc_min controller will be activated
if the DC-link voltage (r0026) falls below
the level specified in r1246.
The kinetic energy of the motor is used
to buffer the DC-link voltage, thus
causing deceleration of the inverter! So
short mains failures do not necessarily
lead to an undervoltage trip.
Note that this warning may also occur
on fast ramp-ups.
A921
AO parameters not set
properly
AO parameters (P0777 and P0779)
should not be set to identical values,
since this would produce illogical
results.
Check the following:
• Parameter settings for output identical
• Parameter settings for input identical
• Parameter settings for output do not correspond
to AO type
Set P0777 and P0779 to different values.
A922
No load applied to inverter
No Load is applied to the inverter.
As a result, some functions may not
work as under normal load conditions.
Check that motor is connected to inverter.
A923
Both JOG left and JOG
right are requested
Both JOG right and JOG left (P1055 /
P1056) have been requested. This
freezes the RFG output frequency at its
current value.
Do not press JOG right and left simultaneously.
A930
Cavitation protection warn
Conditions exist for possible cavitation
damage.
See F410.
A936
PID autotuning active
PID autotuning (P2350) selected or
running
Warning disappears when PID autotuning has
finished.
A952
Belt failure detected
Load conditions on motor indicate belt
failure or mechanical fault.
See F452.
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