Danfoss VLT AAF006 Service Manual page 42

Troubleshooting
WARNING/ALARM 309, Mains earth fault
A ground fault was detected, measured by the CT line
power currents.
The sum current from three line power CTs is too high.
The ground fault must be detected at every sample during
a period of 400 ms, for Alarm 309 to be reported.
Troubleshooting:
Check the installation line power CTs and wiring
Replace the AFC card
ALARM 311, Switch freq. limit
The average switching frequency of the unit exceeded the
limit.
If the actual switching frequency exceeds 6 kHz for 10
electrical cycles, Alarm 311 is reported.
Service parameter 98-21 displays the actual switching
frequency. NOTE: Do not change any service parameters
unless directed to do so in this service manual.
Troubleshooting
Perform the Line Power Resonance Test (6.3.7 Line
Power Resonance Test)
ALARM 314, Auto CT interrupt
Auto CT detection was interrupted by the user.
ALARM 315, Auto CT error
An error was detected while performing auto CT detection.
Auto CT detection does not work under the following
conditions: if any sum current transformers are installed,
when the active filter is supplied through a step up or step
down transformers, or when the filter is <10% of the CT
primary. Program the CT parameters manually if auto CT
detection fails.
WARNING 316, CT location error
The auto CT function could not determine the correct
locations of the CTs.
Program the CT parameters manually if auto CT detection
fails.
WARNING 317, CT polarity error
The auto CT function could not determine the correct
polarity of the CTs.
Program the CT parameters manually if auto CT detection
fails.
WARNING 318, CT ratio error
The auto CT function could not determine the correct
primary rating of the CTs.
Program the CT parameters manually if auto CT detection
fails.
ALARM 319, Runaway follower
A follower AF was not commanded to run, but the
feedback indicates it is running. The report value indicates
the follower ID.
VLT Advanced Active Filter AAF006 D and E Frames Service Manual
Troubleshooting:
WARNING 320, AC res. HS fault
AC resistor heatsink temperature feedback is not
connected or low temperature.
WARNING 321, Volt imbalance >3%
Possible causes are a phase is missing on the supply side
or the line voltage imbalance is too high.
Troubleshooting: Check the supply voltage imbalance and
main fuses of the filter.
ALARM 322, 5V pwr. card low
5 V power supply from power card is low.
Troubleshooting:
ALARM 323, 15V neg. supply low
The negative 15 V power supply is low.
Troubleshooting:
ALARM 324, 15V pos. supply low
The positive 15 V power supply is low.
Troubleshooting:
®
MG90Z122 - VLT is a registered Danfoss trademark
•
Check the follower unit
•
Check the control wiring
•
Replace the AFC card
•
Replace the power card.
•
Perform the AC capacitors current transducers
test (6 Test Procedures).
•
Check if the connectors on current transducers
and on the AFC card are pinned properly
•
Check the AC capacitors current transducers
cables
•
Replace the AFC card
•
Perform the AC capacitors current transducers
test (6 Test Procedures).
•
Check if the connectors on current transducers
and on the AFC card are pinned properly
•
Check the AC capacitors current transducers
cables
•
Replace the AFC card
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