A0707 Cb Alarm 8 - 10; A0710 Cb Communications Error; A0711 Cb Communications Error; A0910 Vdc-Max Controller Disabled/Switched-Out - Siemens MICROMASTER 440 Parameter Manual

Faults and Alarms
A0707 CB alarm 8
Cause
- CB-(Communications module)-specific
Diagnosis & Remedy
- refer to the CB User Manual
A0708 CB alarm 9
Cause
- CB-(Communications module)-specific
Diagnosis & Remedy
- refer to the CB User Manual
A0709 CB alarm 10
Cause
- CB-(Communications module)-specific
Diagnosis & Remedy
- refer to the CB User Manual

A0710 CB communications error

Cause
- loss of communications with the CB (communications module)
Diagnosis & Remedy
- check the CB hardware

A0711 CB communications error

Cause
- CB (communications module) signals a communications error.
Diagnosis & Remedy
- check the CB parameters

A0910 Vdc-max controller disabled/switched-out

Cause
- Vdc max controller was de-activated, as it was not able to keep the DC link voltage (r0026) within the
limit values (refer to r0026 and P1240).
This occurs,
- if the line supply voltage is permanently too high.
- if the motor is driven by an active load, which means that the motor goes into regenerative operation.
- while decelerating (short down-ramps P1121) for extremely high load torques
Diagnosis & Remedy
Please check the following:
- is the input voltage (P0756) within the permissible range ?
- are load duty cycle and load limits within the permissible limits ?
A0911 Vdc-max controller active
Cause
- Vdc max controller is active
- the ramp-down times are automatically increased in order to keep the DC link voltage (r0026) within the
limit values (refer to r0026 and P1240).
A0912 Vdc-min controller active
Cause
- Vdc min controller is activated, if the DC link voltage (r0026) falls below the minimum value (refer to
r0026 or P1240).
- the kinetic energy of the motor is used to buffer the DC link voltage and therefore to slow down the
drive.
- therefore brief line failures no longer automatically result in an undervoltage trip.
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Issue 01/06
MICROMASTER 440 Parameter List
6SE6400-5BB00-0BP0