WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation and if it short-circuits, the brake function dis-
connects and issues a warning. The adjustable frequency drive 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 adjustable frequency drive 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 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 adjustable frequency drive power size.
Troubleshooting:
Ambient temperature too high.
Motor cable too long.
Incorrect clearance above and below the adjustable frequency drive.
Dirty heatsink.
Blocked air flow around the adjustable frequency drive.
Damaged heatsink fan.
For the D, E, and F frame adjustable frequency drives, this alarm is based on the temperature
measured by the heatsink sensor mounted inside the IGBT modules. For the F frame adjustable
frequency drives, this alarm can also be caused by the thermal sensor in the rectifier module. See
the rating table in Section 1.9 for the trip point.
Troubleshooting:
Check fan resistance (see section 6.2.9 or 6.2.10).
Check soft charge fuses (see section 6.2.1 or 6.2.3).
IGBT thermal sensor (see section 6.2.8).
ALARM 30, Motor phase U missing
Motor phase U between the adjustable frequency drive and the motor is missing.
Turn off the adjustable frequency drive and check motor phase U.
ALARM 31, Motor phase V missing
Motor phase V between the adjustable frequency drive and the motor is missing.
Turn off the adjustable frequency drive and check motor phase V.
ALARM 32, Motor phase W missing
Motor phase W between the adjustable frequency drive and the motor is missing.
Turn off the adjustable frequency drive and check motor phase W.
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 serial communication bus on the communication option card is not working.
4 Troubleshooting
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
4-14
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
4
Содержание VLT HVAC FC 100
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