WARNING 23, Internal fan fault
The fan warning function is an extra protection function
that checks if the fan is running / mounted. The fan
warning can be disabled in 14-53 Fan Monitor ([0]
Disabled).
For the D, E, and F Frame sizes, the regulated voltage to
the fans is monitored.
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
WARNING 24, External fan fault
The fan warning function is an extra protection function
that checks if the fan is running / mounted. The fan
warning can be disabled in 14-53 Fan Monitor ([0]
Disabled).
For the D, E, and F Frame sizes, the regulated voltage to
the fans is monitored.
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If it short
circuits, the brake function is disconnected and the
warning appears. The frequency converter still works, but
without the brake function. Turn off the frequency
converter and replace the brake resistor (see 2-15 Brake
Check).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated:
as a percentage, as a mean value over the last 120
seconds, on the basis of the resistance value of the brake
resistor, and the intermediate circuit voltage. The warning
is active when the dissipated braking power is higher than
90%. If [2] Trip has been selected in 2-13 Brake Power
Monitoring, the frequency converter cuts out and issues
this alarm, when the dissipated braking power is higher
than 100%.
CAUTION
There is a risk of substantial power being transmitted to
the brake resistor if the brake transistor is short-circuited.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation and if it
short-circuits, the brake function disconnects and issues a
warning. The frequency converter is still able to run, but
since the brake transistor has short-circuited, substantial
power is transmitted to the brake resistor, even if it is
inactive.
Turn off the frequency converter and remove the brake
resistor.
This alarm/ warning could also occur should the brake
resistor overheat. Terminal 104 to 106 are available as
brake resistor. Klixon inputs, see .
WARNING/ALARM 28, Brake check failed
Brake resistor fault: the brake resistor is not connected or
not working.
Check 2-15 Brake Check.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault will not be reset until the
temperature falls below a defined heatsink temperature.
The trip and reset point are different based on the
frequency converter power size.
Troubleshooting:
Ambient temperature too high.
Too long motor cable.
Incorrect clearance above and below the
frequency converter.
Dirty heatsink.
Blocked air flow around the frequency converter.
Damaged heatsink fan.
For the D, E, and F Frame sizes, this alarm is based on the
temperature measured by the heatsink sensor mounted
inside the IGBT modules. For the F Frame sizes, this alarm
can also be caused by the thermal sensor in the Rectifier
module.
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
IGBT thermal sensor.
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Turn off 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.
Turn off the frequency converter and check motor phase V.
ALARM 32, Motor phase W missing
Motor phase W between the frequency converter and the
motor is missing.
Turn off the frequency converter and check motor phase
W.
ALARM 33, Inrush fault
Too many power-ups have occurred within a short time
period. Let unit cool to operating temperature.
WARNING/ALARM 34, Fieldbus communication fault
The fieldbus on the communication option card is not
working.
Troubleshooting VLT Automation Low Harmonic Drive Operating Instructions
154 MG34O202 - VLT
®
is a registered Danfoss trademark
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