Operating instructions

Issue B1 6 Troubleshooting
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
73
Fault Possible Causes Diagnose & Remedy Reac-
tion
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 configu-
ration 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 (P0756) lies within range?
2. Load must match
In certain cases apply braking resistor
--
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)
1. Check parameter inverter input voltage
2. Check ramp-down times
--
A0912
Vdc-min
controller
active
Vdc min controller will be activated if
DC-link voltage (r0026) falls below
minimum level (P2172)
Ø The kinetic energy of the motor is
used to buffer the DC-link
voltage, thus causing
deceleration of the drive!
Ø So short mains failures do not
necessarily lead to an
undervoltage trip
--
A0920
ADC
parameters
not set
properly
ADC parameters should not be set to
identical values, since this would
produce illogical results.
Ø Index 0: Parameter settings for
output identical
Ø Index 1: Parameter settings for
input identical
Ø Index 2: Parameter settings for
input do not correspond
to ADC type
Analogue input parameters should not be set to
the same value as each other
--
A0921
DAC
parameters
not set
properly
DAC parameters should not be set to
identical values, since this would
produce illogical results.
Ø Index 0: Parameter settings for
output identical
Ø Index 1: Parameter settings for
input identical
Ø Index 2: Parameter settings for
output do not correspond
to DAC type
Analogue Output parameters should not be set to
the same value as each other
--
A0922
No load
applied to
inverter
Ø No Load is applied to the inverter
Ø As a result, some functions may
not work as under normal load
conditions
Low output voltage eg when 0 boost
applied at 0 Hz
1. Check that load is applied to the inverter
2. Check motor parameters correspond to motor
attached
3. As a result, some functions may not work
correctly, because there is no normal load
condition
--