Siemens Micromaster 440 Operating Instructions Manual page 103

Issue 12/02
A0911 Vdc-max controller active
Possible Causes
Vdc max controller is active; so ramp-down times will be increased automatically to keep DC-link
voltage (r0026) within limits (P2172).
A0912 Vdc-min controller active
Possible Causes
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.
A0920 ADC parameters not set properly
Possible Causes
ADC parameters should not be set to identical values, since this would produce illogical results.
Fault value = 0: Parameter settings for output identical
A0921 DAC parameters not set properly
Possible Causes
DAC parameters should not be set to identical values, since this would produce illogical results.
Fault value = 0: Parameter settings for output identical
A0922 No load applied to inverter
Possible Causes
No Load is applied to the inverter.
As a result, some functions may not work as under normal load conditions.
A0923 Both JOG Left and JOG Right are requested
Possible Causes
Both JOG right and JOG left (P1055/P1056) have been requested. This freezes the RFG output
frequency at its current value.
A0936 PID Autotuning Active
Possible Causes
PID Autotuning (P2350) selected or running
MICROMASTER 440
6SE6400-5AW00-0BP0
1: Parameter settings for input identical
2: Parameter settings for input do not correspond to ADC type
1: Parameter settings for input identical
2: Parameter settings for output do not correspond to DAC type
Operating Instructions
6 Troubleshooting
103