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
).
There is a feedback sensor mounted in the fan. If the fan is
commanded to run and there is no feedback from the
sensor, this alarm appears. This alarm also shows if there is
a communication error between the fan power card and
the control card.
Check the alarm log (see
chapter 5.2 Local Control Panel
) for the report value associated with this
warning.
If the report value is 2, there is a hardware problem with 1
of the fans. If the report value is 12, there is a communi-
cation problem between the fan power card and the
control card.
Fan troubleshooting
•
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
•
Check for proper fan operation. Use
parameter
group 43-**Unit Readouts
to show the speed of
each fan.
Fan power card troubleshooting
•
Check the wiring between the fan power card
and the control card.
•
Fan power card may need to be replaced.
•
Control card may need to be replaced.
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
).
There is a feedback sensor mounted in the fan. If the fan is
commanded to run and there is no feedback from the
sensor, this alarm appears. This alarm also shows if there is
a communication error between the power card and the
control card.
Check the alarm log (see
chapter 5.2 Local Control Panel
) for the report value associated with this
warning.
If the report value is 1, there is a hardware problem with 1
of the fans. If the report value is 11, there is a communi-
cation problem between the power card and the control
card.
Fan troubleshooting
•
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
•
Check for proper fan operation. Use
parameter
group 43-**Unit Readouts
to show the speed of
each fan.
Power card troubleshooting
•
Check the wiring between the power card and
the control card.
•
Power card may need to be replaced.
•
Control card may need to be replaced.
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.
Maintenance, Diagnostics, a...
VLT
®
AutomationDrive FC 301/302
26
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MG33AT02
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