Danfoss VLT FC 302 Operating Instructions Manual page 127

Warnings and Alarms
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15-50 SW ID Power Card
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15-60 Option Mounted
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15-61 Option SW Version (for each option slot)
ALARM 16, Short circuit
There is short-circuiting in the motor or motor wiring.
Troubleshooting
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Remove the power to the frequency converter
and repair the short-circuit.
WARNING/ALARM 17, Control word timeout
There is no communication with the frequency converter.
The warning is only active when 8-04 Control Word Timeout
Function is not set to [0] Off.
If 8-04 Control Word Timeout Function is set to [2] Stop and
[26] Trip, a warning appears and the frequency converter
ramps down until it trips and then displays an alarm.
Troubleshooting
•
Check the connections on the serial communi-
cation cable.
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Increase 8-03 Control Word Timeout Time
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Check the operation of the communication
equipment.
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Verify a proper installation based on EMC
requirements.
WARNING/ALARM 22, Hoist mechanical brake
Report value shows what kind it is.
0 = The torque reference was not reached before timeout
(parameter 2-27 Torque Ramp Time).
1 = Expected brake feedback 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 an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in 14-53 Fan Monitor ([0] Disabled).
Troubleshooting
•
Check the fan resistance.
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Check the soft charge fuses.
WARNING 24, External fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in 14-53 Fan Monitor ([0] Disabled).
Troubleshooting
•
Check the fan resistance.
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Check the soft charge fuses.
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.
MG37A202
Operating Instructions
Troubleshooting
•
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
is >90% of the brake resistance power. If [2] Trip is selected
in parameter 2-13 Brake Power Monitoring, the frequency
converter trips when the dissipated braking power reaches
100%.
WARNING
If the brake transistor is short-circuited, there is a risk of
substantial power being transmitted to the brake
resistor.
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 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.
Remove the power to the frequency converter and remove
the brake resistor.
This alarm/warning could also occur if the brake resistor
overheats. Terminals 104 and 106 are available as brake
resistors Klixon inputs.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check parameter 2-15 Brake Check.
ALARM 29, Heat Sink temp
The maximum temperature of the heat sink has been
exceeded. The temperature fault resets when the
temperature falls below a defined heat sink temperature.
The trip and reset points vary based on the frequency
converter power size.
Troubleshooting
Check for the following conditions.
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Danfoss A/S © Rev. 2014-07-29 All rights reserved.
Remove the power to the frequency converter
and replace the brake resistor (see
parameter 2-15 Brake Check).
Ambient temperature too high.
Motor cables too long.
Incorrect airflow clearance above and below the
frequency converter.
Blocked airflow around the frequency converter.
Damaged heat sink fan.
Dirty heat sink.
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