Danfoss VLT Micro Drive FC 51 Programming Manual page 68

Troubleshooting ®
VLT Micro Drive FC 51 Programming Guide
Troubleshooting:
Check connections on the serial communication
cable.
Increase 8-03 Control Word Timeout Time
Check the operation of the communication
equipment.
Verify a proper installation based on EMC
requirements.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If a short
circuit occurs, the brake function is disabled and the
warning appears. The frequency converter is still
operational but without the brake function. Remove power
to the frequency converter and replace the brake resistor
(see 2-15 Brake Check).
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation and if a
short circuit occurs, the brake function is disabled and a
warning is issued. The frequency converter is still
operational but, since the brake transistor has short-
circuited, substantial power is transmitted to the brake
resistor, even if it is inactive.
Remove power to the frequency converter and remove the
brake resistor.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault will not reset until the
temperature falls below a defined heatsink temperature.
The trip and reset points are different based on the
frequency converter power size.
Troubleshooting
Check for the following conditions.
Ambient temperature too high.
Motor cable too long.
Incorrect airflow clearance above and below the
frequency converter.
Blocked airflow around the frequency converter.
Damaged heatsink fan.
Dirty heatsink.
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase U.
ALARM 31, Motor phase V missing
Motor phase V between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase V.
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ALARM 32, Motor phase W missing
Motor phase W between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase W.
ALARM 38, Internal fault
Troubleshooting
Cycle power
Check that the option is properly installed
Check for loose or missing wiring
It may be necessary to contact the local Danfoss supplier
or service department. Note the code number for further
troubleshooting directions.
WARNING 47, 24 V supply low
The 24 V DC is measured on the control card. The external
24 V DC backup power supply may be overloaded,
otherwise contact the Danfoss supplier.
ALARM 51, AMT check U and I
nom nom
The settings for motor voltage, motor current, and motor
power are wrong. Check the settings in parameters 1-20 to
1-25.
ALARM 55, AMA parameter out of range
The parameter values of the motor are outside of the
acceptable range. AMA does not run.
ALARM 63, Mechanical brake low
The actual motor current has not exceeded the "release
brake" current within the "Start delay" time window.
ALARM 80, Drive initialised to default value
Parameter settings are initialised to default settings after a
manual reset. Reset the unit to clear the alarm.
ALARM 84,The connection between drive and LCP is lost
Try to reassemble the LCP gently.
ALARM 85, Button disabled
See parameter group 0-4* LCP
ALARM 86, Copy fail
An error occurred while copying from frequency converter
to LCP or vice versa.
ALARM 87, LCP data invalid
Occurs when copying from LCP if the LCP contains
erroneous data - or if no data was uploaded to the LCP.
ALARM 88,LCP data not compatible
Occurs when copying from LCP if data are moved between
frequency converters with major differences in software
versions.
WARNING 89, Parameter read only
Occurs when trying to write to a read-only parameter.
ALARM 90, Parameter database busy
LCP and RS-485 connection are trying to update
parameters simultaneously.
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