Danfoss VLT HVAC Drive FC 102 Instruction Manual page 129

Warnings and Alarms
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Activate the functions in parameter 2-10 Brake
Function.
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Increase parameter 14-26 Trip Delay at Inverter
Fault.
WARNING/ALARM 8, DC undervoltage
If the intermediate circuit voltage (DC link) drops below
the undervoltage limit, the adjustable frequency drive
checks if a 24 V DC backup supply is connected. If no 24 V
DC backup supply is connected, the adjustable frequency
drive trips after a fixed time delay. The time delay varies
with unit size.
Troubleshooting
•
Make sure that the supply voltage matches the
adjustable frequency drive voltage.
•
Perform an input voltage test.
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Perform a soft charge circuit test.
WARNING/ALARM 9, Inverter overload
The adjustable frequency drive is about to cut out because
of an overload (current too high for too long). The counter
for electronic thermal inverter protection issues a warning
at 98% and trips at 100%, while issuing an alarm. The
adjustable frequency drive cannot be reset until the
counter is below 90%.
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 counter should
decrease.
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the adjustable frequency
drive 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.
MG11F522
Instruction Manual
•
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WARNING/ALARM 11, Motor thermistor overtemp
The thermistor may be disconnected. Select whether the
adjustable frequency drive issues a warning or an alarm in
parameter 1-90 Motor Thermal Protection.
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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Danfoss A/S © 08/2014 All rights reserved.
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 adjustable frequency
drive to the motor more accurately and reduces
thermal loading.
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 1-93 Thermistor Resource
matches sensor wiring.
If using a KTY sensor, check the programming of
1-95 KTY Sensor Type, 1-96 KTY Thermistor
Resource, and 1-97 KTY Threshold level match
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.
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