0 = The torque reference was not reached before timeout
(
parameter 2-27 Torque Ramp Up Time
).
1 = Expected brake feedback was not received before
timeout (
parameter 2-23 Activate Brake Delay
,
parameter 2-25 Brake Release Time
).
WARNING 23, Internal fan fault
The fan warning function is a protective function that
checks if the fan is running/mounted. The fan warning can
be disabled in
parameter 14-53 Fan Monitor
(
[0] Disabled
).
For drives with DC fans, a feedback sensor is mounted in
the fan. If the fan is commanded to run and there is no
feedback from the sensor, this alarm appears. For drives
with AC fans, the voltage to the fan is monitored.
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the drive and check that the fan
operates briefly at start-up.
•
Check the sensors on the control card.
WARNING 24, External fan fault
The fan warning function is a protective function that
checks if the fan is running/mounted. The fan warning can
be disabled in
parameter 14-53 Fan Monitor
(
[0] Disabled
).
For drives with DC fans, a feedback sensor is mounted in
the fan. If the fan is commanded to run and there is no
feedback from the sensor, this alarm appears. For drives
with AC fans, the voltage to the fan is monitored.
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the drive and check that the fan
operates briefly at start-up.
•
Check the sensors on the heat sink.
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.
Troubleshooting
•
Remove the power to the frequency converter
and replace the brake resistor (refer to
parameter 2-15 Brake Check
).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated as
an average value over the last 120 s of run-time. The
calculation is based on the DC-link voltage and the brake
resistor value set in
parameter 2-16 AC brake Max. Current
.
The warning is active when the dissipated braking power
is higher than 90% of the brake resistor power. If option
[2]
Trip
is selected in
parameter 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, and 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.
Troubleshooting
•
Remove power to the frequency converter and
remove the brake resistor.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Troubleshooting
•
Check
parameter 2-15 Brake Check
.
ALARM 29, Heat Sink temp
The maximum temperature of the heat sink is exceeded.
The temperature fault is 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 for the following conditions:
•
The ambient temperature is too high.
•
The motor cables are too long.
•
Incorrect airflow clearance above and below the
frequency converter.
•
Blocked airflow around the frequency converter.
•
Damaged heat sink fan.
•
Dirty heat sink.
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
WARNING
HIGH VOLTAGE
Frequency converters contain high voltage when
connected to AC mains input, DC supply, or load sharing.
Failure to use qualified personnel to install, start up, and
maintain the frequency converter can result in death or
serious injury.
•
Disconnect power before proceeding.
Troubleshooting
•
Remove the power from 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.
Troubleshooting
Programming Guide
MG33MP02
Danfoss A/S © 10/2018 All rights reserved.
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Summary of Contents for VLT AutomationDrive FC 302
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