6 Troubleshooting
MICROMASTER 430 Operating Instructions
82 6SE6400-5AC00-0BP0
Alarm Possible Causes Diagnose & Remedy
A0702
CB warning 3
CB (communication board) specific See CB user manual
A0703
CB warning 4
CB (communication board) specific See CB user manual
A0704
CB warning 5
CB (communication board) specific See CB user manual
A0705
CB warning 6
CB (communication board) specific See CB user manual
A0706
CB warning 7
CB (communication board) specific See CB user manual
A0707
CB warning 8
CB (communication board) specific See CB user manual
A0708
CB warning 9
CB (communication board) specific See CB user manual
A0709
CB warning 10
CB (communication board) specific See CB user manual
A0710
CB communi-
cation error
Communication with CB
(communication board) is lost
Check CB hardware
A0711
CB configura-
tion error
CB (communication board) reports a
configuration error.
Check CB parameters
A0910
Vdc-max
controller de-
activated
Vdc max controller has been de-
activated, since controller is not
capable of keeping DC-link voltage
(r0026) within limits (P2172).
Ø Occurs if main supply voltage
(P0210) is permanently too high.
Ø Occurs if motor is driven by an
active load, causing motor to
goes into regenerative mode.
Ø Occurs at very high load inertias,
when ramping down.
Check the following:
1. Input voltage (P0210) must lie within range.
2. Load must be match.
A0911
Vdc-max
controller
active
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
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.
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