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
par. 14-53
Fan Monitor
([0] Disabled).
For the D, E, and F Frame drives, 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 fre-
quency converter and replace the brake resistor (see par. 2-15
Brake
Check
).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated: as a percent-
age, as a mean value over the last 120 seconds, on the basis of the re-
sistance value of the brake resistor, and the intermediate circuit volt-
age. The warning is active when the dissipated braking power is higher
than 90%. If
Trip
[2] has been selected in par. 2-13
Brake Power Moni-
toring
, the frequency converter cuts out and issues this alarm, when
the dissipated braking power is higher than 100%.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation and if it short-cir-
cuits, the brake function disconnects and issues a warning. The fre-
quency 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 over-
heat. Terminal 104 to 106 are available as brake resistor. Klixon inputs,
see section Brake Resistor Temperature Switch.
WARNING/ALARM 28, Brake check failed
Brake resistor fault: the brake resistor is not connected or not working.
Check par. 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 drive power size.
Troubleshooting:
Ambient temperature too high.
Too long motor cable.
Incorrect clearance above and below the drive.
Dirty heatsink.
Blocked air flow around the drive.
Damaged heatsink fan.
For the D, E, and F Frame Drives, this alarm is based on the tempera-
ture measured by the heatsink sensor mounted inside the IGBT mod-
ules. For the F Frame drives, this alarm can also be caused by the ther-
mal 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 miss-
ing.
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 miss-
ing.
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.
WARNING/ALARM 35, Out of frequency range:
This warning is active if the output frequency has reached the high limit
(set in par. 4-53) or low limit (set in par. 4-52). In
Process Control,
Closed Loop
(par. 1-00) this warning is displayed.
WARNING/ALARM 36, Mains failure
This warning/alarm is only active if the supply voltage to the frequency
converter is lost and par. 14-10
Mains Failure
is NOT set to OFF. Check
the fuses to the frequency converter
ALARM 38, Internal fault
It may be necessary to contact your Danfoss supplier. Some typical
alarm messages:
0
Serial port cannot be initialized. Serious hardware fail-
ure
256-258 Power EEPROM data is defect or too old
512
Control board EEPROM data is defect or too old
513
Communication time out reading EEPROM data
514
Communication time out reading EEPROM data
515
Application Orientated Control cannot recognize the EE-
PROM data
516
Cannot write to the EEPROM because a write command
is on progress
517
Write command is under time out
518
Failure in the EEPROM
VLT HVAC Drive High Power Operating In-
structions
8 Warnings and Alarms
MG.11.F3.02 - VLT
®
is a registered Danfoss trademark
183
8