Danfoss VLT AQUA FC 202 Operating Instructions Manual page 39

Maintenance, Diagnostics an...
Record the value of the following parameters and contact
your local Danfoss supplier:
•
15-40 FC Type
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15-41 Power Section
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15-42 Voltage
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15-43 Software Version
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15-45 Actual Typecode String
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15-49 SW ID Control Card
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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.
•
Remove power to the frequency converter and
repair the short circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning is only active when 8-04 Control Word Timeout
Function is NOT set to Off.
If 8-04 Control Word Timeout Function is set to Stop and
Trip, a warning appears and the frequency converter ramps
down until it trips, then displays an alarm.
Troubleshooting
•
Check the connections on the serial communi-
cation cable.
•
Increase 8-03 Control Word Timeout Time.
•
Check the operation of the communication
equipment.
•
Verify a proper installation based on EMC
requirements.
WARNING/ALARM 22, Hoist mechanical brake
When this warning is active, the LCP shows the type of
issue.
0 = The torque ref. was not reached before timeout.
1 = There was no brake feedback before timeout.
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.
•
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.
•
Check the soft charge fuses.
MG20MB02
Operating Instructions
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. Remove power
to the frequency converter and replace the brake resistor
(see 2-15 Brake Check).
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 higher than 90% of the brake resistance power. If [2] Trip
is selected in 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. 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 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
resistor's Klixon inputs, see Brake Resistor Temperature
Switch in the Design Guide.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check 2-15 Brake Check.
ALARM 29, Heat Sink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault does not reset until the
temperature drops below a defined heatsink temperature.
The trip and reset points vary based on the frequency
converter power size.
Troubleshooting
Check for the following conditions:
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•
•
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This alarm is based on the temperature measured by the
heatsink sensor mounted inside the IGBT modules.
Danfoss A/S © Rev. 05/2014 All rights reserved.
Ambient temperature too high.
Motor cable too long.
Incorrect airflow clearance above and below the
frequency converter.
Blocked airflow around the frequency converter.
Damaged heatsink fan.
Dirty heatsink.
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