Danfoss VLT Aqua Drive FC 202 Operating Manual page 42

Maintenance, Diagnostics, a...
connected, the frequency converter trips after a fixed time
delay. The time delay varies with unit size.
Troubleshooting
•
Check that the supply voltage matches the
frequency converter voltage.
•
Perform an input voltage test.
•
Perform a soft charge circuit test.
WARNING/ALARM 9, Inverter overload
The frequency converter is about to cut out because of an
overload (too high current for too long). The counter for
electronic thermal inverter protection issues a warning at
98% and trips at 100%, while issuing an alarm. The
frequency converter cannot be reset until the counter is
below 90%.
Troubleshooting
•
Compare the output current shown on the LCP
7 7
with the frequency converter rated current.
•
Compare the output current shown on the LCP
with measured motor current.
•
Show the thermal load on the LCP and monitor
the value. When running above the frequency
converter continuous current rating, the counter
should increase. When running below the
frequency converter continuous current rating,
the counter should decrease.
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the frequency converter
issues a warning or an alarm when the counter reaches
100% in parameter 1-90 Motor Thermal Protection. The fault
occurs when the motor overload exceeds 100% for too
long.
Troubleshooting
•
Check for motor overheating.
•
Check if the motor is mechanically overloaded.
•
Check that the motor current set in
parameter 1-24 Motor Current is correct.
•
Ensure the motor data in parameters 1-20
through 1-25 is set correctly.
•
If an external fan is used, check that it is selected
in parameter 1-91 Motor External Fan.
•
Running AMA in parameter 1-29 Automatic Motor
Adaptation (AMA) tunes the frequency converter
to the motor more accurately and reduces
thermal loading.
WARNING/ALARM 11, Motor thermistor overtemp
The thermistor may be disconnected. Select whether the
frequency converter issues a warning or an alarm in
parameter 1-90 Motor Thermal Protection.
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VLT AQUA Drive FC 202
Troubleshooting
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WARNING/ALARM 12, Torque limit
The torque has exceeded the value in
parameter 4-16 Torque Limit Motor Mode or the value in
parameter 4-17 Torque Limit Generator Mode.
Parameter 14-25 Trip Delay at Torque Limit can change this
from a warning-only condition to a warning followed by an
alarm.
Troubleshooting
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WARNING/ALARM 13, Over current
The inverter peak current limit (approximately 200% of the
rated current) is exceeded. The warning lasts about 1.5 s,
then the frequency converter trips and issues an alarm.
Shock loading or fast acceleration with high-inertia loads
can cause this fault. If extended mechanical brake control
is selected, the trip can be reset externally.
Troubleshooting
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Check for motor overheating.
Check if the motor is mechanically overloaded.
Check that the thermistor is connected correctly
between either terminal 53 or 54 (analog voltage
input) and terminal 50 (+10 V supply) and that
the terminal switch for 53 or 54 is set for voltage.
Check parameter 1-93 Thermistor Source selects
terminal 53 or 54.
When using digital inputs 18 or 19, check that
the thermistor is connected correctly between
either terminal 18 or 19 (digital input PNP only)
and terminal 50.
If a KTY sensor is used, check for correct
connection between terminals 54 and 55.
If using a thermal switch or thermistor, check that
the programming if parameter 1-93 Thermistor
Source matches sensor wiring.
If the motor torque limit is exceeded during
ramp-up, extend the ramp-up time.
If the generator torque limit is exceeded during
ramp down, extend the ramp-down time.
If torque limit occurs while running, possibly
increase the torque limit. Be sure that the system
can operate safely at a higher torque.
Check the application for excessive current draw
on the motor.
Remove power and check if the motor shaft can
be turned.
Check that the motor size matches the frequency
converter.
Check parameters 1-20 to 1-25 for correct motor
data.
MG20MD02