WARNING/ALARM 9, Inverter overloaded
The adjustable frequency drive is about to cut out because of an overload (too high current for
too long). The counter for electronic, thermal inverter protection gives a warning at 98% and trips
at 100%, while giving an alarm. The adjustable frequency drive
cannot
be reset until the counter
is below 90%.
The fault is that the adjustable frequency drive is overloaded by more than 100% for too long.
Troubleshooting:
Compare the output current shown on the LCP with the adjustable frequency drive rated
current.
Compare the output current shown on the LCP with measured motor current.
Display the Thermal Drive Load on the LCP and monitor the value. When running above
the adjustable frequency drive continuous current rating, the counter should increase.
When running below the adjustable frequency drive continuous current rating, the coun-
ter should decrease.
Note: See the derating section in the Design Guide for more details if a high switching frequency
is required.
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the motor is too hot. Select whether the
adjustable frequency drive should give a warning or an alarm when the counter reaches 100% in
par. 1-90
Motor Thermal Protection
. The fault is that the motor is overloaded by more than 100%
for too long.
Troubleshooting:
Check if motor is overheating.
If the motor is mechanically overloaded
That the motor par. 1-24
Motor Current
is set correctly.
Motor data in parameters 1-20 through 1-25 are set correctly.
The setting in par. 1-91
Motor External Fan
.
Run AMA in par. 1-29
Automatic Motor Adaptation (AMA)
.
WARNING/ALARM 11, Motor thermistor overtemp
The thermistor or the thermistor connection is disconnected. Select whether the adjustable fre-
quency drive gives a warning or an alarm when the counter reaches 100% in par. 1-90
Motor
Thermal Protection
.
Troubleshooting:
Check if motor is overheating.
Check if the motor is mechanically overloaded.
Check that the thermistor is connected correctly between terminal 53 or 54 (analog volt-
age input) and terminal 50 (+10 V supply), or between terminal 18 or 19 (digital input
PNP only) and terminal 50.
If a KTY sensor is used, check for correct connection between terminal 54 and 55.
If using a thermal switch or thermistor, check the programming of par. 1-93
Thermistor
Resource
matches sensor wiring.
If using a KTY sensor, check the programming of parameters 1-95, 1-96, and 1-97 match
sensor wiring.
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
4 Troubleshooting
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
4-11
4
Содержание VLT HVAC FC 100
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