Danfoss VLT HVAC Drive FC 102 Instruction Manual page 131

Warnings and Alarms
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
calculation is based on the intermediate circuit voltage and
the brake resistance value set in parameter 2-16 AC Brake
Max. Current. The warning is active when the dissipated
braking energy is higher than 90% of the brake resistance
power. If [2] Trip is selected in parameter 2-13 Brake Power
Monitoring, the adjustable frequency drive trips when the
dissipated braking energy 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 adjustable frequency drive 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 adjustable frequency drive 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 parameter 2-15 Brake Check.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault does not reset until the
temperature drops below a defined heatsink temperature.
The trip and reset points are different based on the
adjustable frequency drive power size.
Troubleshooting
Check the following conditions:
•
Ambient temperature too high.
•
Motor cable too long.
•
Incorrect airflow clearance above and below the
adjustable frequency drive.
•
Blocked airflow around the adjustable frequency
drive.
•
Damaged heatsink fan.
•
Dirty heatsink.
For D, E and F enclosure sizes, this alarm is based on the
temperature measured by the heatsink sensor mounted
inside the IGBT modules. For F enclosures, the thermal
sensor in the rectifier module can also cause this alarm.
Troubleshooting
•
Check fan resistance.
•
Check soft charge fuses.
•
IGBT thermal sensor.
MG11F522
Instruction Manual
ALARM 30, Motor phase U missing
Motor phase U between the adjustable frequency drive
and the motor is missing.
Troubleshooting
•
ALARM 31, Motor phase V missing
Motor phase V between the adjustable frequency drive
and the motor is missing.
Troubleshooting
•
ALARM 32, Motor phase W missing
Motor phase W between the adjustable frequency drive
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, Serial communication bus
communication fault
The serial communication bus 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 parameter 4-53 Warning Speed High)
or low limit (set in parameter 4-52 Warning Speed Low). In
[3] Closed-loop (parameter 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 adjustable frequency drive is lost and
parameter 14-10 Mains Failure is NOT set to [0] No Function.
Troubleshooting
•
ALARM 38, Internal fault
When an internal fault occurs, a code number defined in
Table 8.4 is displayed.
Troubleshooting
•
•
•
Contact the Danfoss supplier or Danfoss service, if
necessary. Note the code number for further trouble-
shooting directions.
Danfoss A/S © 08/2014 All rights reserved.
Remove power from the adjustable frequency
drive and check motor phase U.
Remove power from the adjustable frequency
drive and check motor phase V.
Remove power from the adjustable frequency
drive and check motor phase W.
Check the fuses to the adjustable frequency drive
and line power supply to the unit.
Cycle power.
Check that the option is properly installed.
Check for loose or missing wiring.
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