Honeywell 3G SmartVFD HVFD3D3A0015 Installation And User Manual page 72

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 2-16 AC brake Max. Current. The warning is
active when the dissipated braking energy is higher than 90% of the brake resis-
tance power. If [2] Trip is selected in 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 and 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.
Troubleshooting
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working. Check 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 falls below a defined heatsink tempera-
ture. The trip and reset points are different based on the adjustable frequency drive
power size.
Troubleshooting
Check for the following conditions.
ALARM 30, Motor phase U missing
Motor phase U between the adjustable frequency drive and the motor is missing.
Remove power from 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.
Remove power from the adjustable frequency drive and check motor phase V.
31-00559-01
• Remove power to the adjustable frequency drive and remove the brake
resistor.
• 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.
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