Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 124

Warnings and Alarms
WARNING 24, External fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in 14-53 Fan Monitor ([0] Disabled).
For D, E and F enclosure sizes, the regulated voltage to the
fan is monitored.
Troubleshooting
•
Check fan resistance.
•
Check soft charge fuses.
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
from 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 mean value over the last 120 s of run time. The
8 8
calculation is based on the intermediate circuit voltage and
the brake resistance value set in 2-16 AC brake Max.
Current. The warning is active when the dissipated braking
is higher than 90% of the brake resistance power. If [2] Trip
is selected in 2-13 Brake Power Monitoring, the frequency
converter trips when the dissipated braking power reaches
100%.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation. 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 from the frequency converter and remove
the brake resistor.
This alarm/warning could also occur if the brake resistor
overheats. Terminals 104 and 106 are available as brake
resistor Klixon inputs, see Brake Resistor Temperature Switch
in the Design Guide.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check 2-15 Brake Check.
ALARM 29, Heat sink temp
The maximum temperature of the heat sink has been
exceeded. The temperature fault does not reset until the
temperature drops below a defined heat sink temperature.
The trip and reset points are different based on the
frequency converter power size.
Troubleshooting
Check the following conditions:
•
Ambient temperature too high.
•
Motor cable too long.
122
Operating Instructions
•
•
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For D, E and F enclosure sizes, this alarm is based on the
temperature measured by the heat sink sensor mounted
inside the IGBT modules. For F enclosures, the thermal
sensor in the rectifier module can also cause this alarm.
Troubleshooting
•
•
•
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Troubleshooting
•
ALARM 31, Motor phase V missing
Motor phase V between the frequency converter and the
motor is missing.
Troubleshooting
•
ALARM 32, Motor phase W missing
Motor phase W between the frequency converter and the
motor is missing.
Troubleshooting
•
ALARM 33, Inrush fault
Too many power-ups have occurred within a short time
period. Let the 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 4-53 Warning Speed High) or low limit
(set in 4-52 Warning Speed Low). In [3] Closed Loop
(1-00 Configuration Mode), 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 14-10 Mains Failure is
NOT set to [0] No Function.
Troubleshooting
•
Danfoss A/S © 08/2014 All rights reserved.
Incorrect airflow clearance above and below the
frequency converter.
Blocked airflow around the frequency converter.
Damaged heat sink fan.
Dirty heat sink.
Check fan resistance.
Check soft charge fuses.
IGBT thermal sensor.
Remove power from the frequency converter and
check motor phase U.
Remove power from the frequency converter and
check motor phase V.
Remove power from the frequency converter and
check motor phase W.
Check the fuses to the frequency converter and
mains power supply to the unit.
MG11F502