Siemens Sinamics G120 Series - A00911 Vdc-max controller active; A00912 Vdc-min Controller active; A00921 AO parameters not set properly.; A00922 No load applied to inverter

Faults and Alarms
List of Fault and Alarm messages
3-396
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
A00911 Vdc-max controller active
Reaction: NONE
Acknowledge: NONE
Cause: Vdc max controller is active; so ramp-down times will be increased automatically to keep DC-link voltage (r0026)
within limits (P2172).
Remedy: 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.
A00912 Vdc-min Controller active
Reaction: NONE
Acknowledge: NONE
Cause: Vdc min controller will be activated if DC-link voltage (r0026) falls below minimum level (P2172).
The kinetic energy of the motor is used to buffer the DC-link voltage, thus causing deceleration of the drive! So short
mains failures do not necessarily lead to an undervoltage trip.
Remedy:
A00921 AO parameters not set properly.
Reaction: NONE
Acknowledge: NONE
Cause: AO parameters (P0777 and P0779) should not be set to identical values, since this would produce illogical results.
Remedy: 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.
A00922 No load applied to inverter
Reaction: NONE
Acknowledge: NONE
Cause: No Load is applied to the inverter.
As a result, some functions may not work as under normal load conditions.
Remedy: Check that motor is connected to inverter.
A00923 Both JOG Left and JOG Right are requested
Reaction: NONE
Acknowledge: NONE
Cause: Both JOG right and JOG left (P1055/P1056) have been requested. This freezes the RFG output frequency at its cur-
rent value.
Remedy: Do not press JOG right and left simulutanously.
A00936 PID Autotuning Active
Reaction: NONE
Acknowledge: NONE
Cause: PID Autotuning (P2350) selected or running
Remedy: Alarm disappears when PID Autotuning has finished.