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
Fan Moni-
tor
, par. 14-53, [0] Disabled.
WARNING 25, Brake resistor short-circuited:
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
).
ALARM/WARNING 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 s, on the basis of the resistance value
of the brake resistor (par. 2-11) and the intermediate circuit voltage. The
warning is active when the dissipated braking power is higher than 90%.
If
Trip
[2] has been selected in par. 2-13, 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-circuits,
the brake function disconnects and the warning comes up. 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.
Warning: There is a risk of substantial power being
transmitted to the brake resistor if the brake transistor
is short-circuited.
ALARM/WARNING 28, Brake check failed:
Brake resistor fault: the brake resistor is not connected/working.
WARNING/ALARM 29, Drive over temperature:
If the enclosure isIP00, IP20/Nema1 or IP21/TYPE 1, the cut-out tem-
perature of the heat-sink is 95
o
C +5
o
C. The temperature fault cannot
be reset, until the temperature of the heatsink is below 70
o
C.
The fault could be:
- Ambient temperature too high
- Too long motor cable
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 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 miss-
ing.
Turn off the frequency converter and check motor phase W.
ALARM 33, Inrush fault:
Too many powerups have occured within a short time period. See the
chapter
General Specifications
for the allowed number of powerups within
one minute.
WARNING/ALARM 34, Fieldbus communication fault:
The fieldbus on the communication option card is not working.
WARNING/ALARM 36, Mains failure:
This warning/alarm is only active if the supply voltage to the frequency
converter is lost and parameter 14-10 is NOT set to OFF. Possible cor-
rection: check the fuses to the frequency converter
ALARM 38, Internal fault:
Contact your local Danfoss supplier.
WARNING 40, Overload of Digital Output Terminal 27
Check the load connected to terminal 27 or remove short-circuit connec-
tion. Check parameters 5-00 and 5-01.
WARNING 41, Overload of Digital Output Terminal 29:
Check the load connected to terminal 29 or remove short-circuit connec-
tion. Check parameters 5-00 and 5-02.
WARNING 42, Overload of Digital Output On X30/6 :
Check the load connected to X30/6 or remove short-circuit connection.
Check parameter 5-32.
WARNING 42, Overload of Digital Output On X30/7 :
Check the load connected to X30/7 or remove short-circuit connection.
Check parameter 5-33.
WARNING 47, 24 V supply low:
The external 24 V DC backup power supply may be overloaded, otherwise
contact your Danfoss supplier.
ALARM 48, 1.8 V supply low:
Contact your Danfoss supplier.
WARNING 49, Speed limit:
The speed has been limited by range in par. 4-11 and par. 4-13.
ALARM 50, AMA calibration failed:
Contact your Danfoss supplier.
ALARM 51, AMA check Unom and Inom:
The setting of motor voltage, motor current, and motor power is pre-
sumably wrong. Check the settings.
ALARM 52, AMA low Inom:
The motor current is too low. Check the settings.
ALARM 53, AMA motor too big:
The motor is too big for the AMA to be carried out.
ALARM 54, AMA motor too small:
The motor is too small for the AMA to be carried out.
ALARM 55, AMA par. out of range:
The par. values found from the motor are outside acceptable range.
ALARM 56, AMA interrupted by user:
The AMA has been interrupted by the user.
ALARM 57, AMA timeout:
Try to start the AMA again a number of times, until the AMA is carried
out. Please note that repeated runs may heat the motor to a level where
the resistance Rs and Rr are increased. In most cases, however, this is
not critical.
WARNING/ALARM 58, AMA internal fault:
Contact your Danfoss supplier.
WARNING 59, Current limit:
The current is higher than the value in par. 4-18.
4. Troubleshooting VLT
®
HVAC Drive Programming Guide
238
MG.11.C5.02 - VLT
®
is a registered Danfoss trademark
4
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