Faults and Alarms

Issue 01/06

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.

318

MICROMASTER 440 Parameter List

6SE6400-5BB00-0BP0

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Image 318
Siemens 440 A0707 CB alarm, A0708 CB alarm, A0709 CB alarm, A0710 CB communications error, A0711 CB communications error