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If the alarm/warning occurs during a power sag, use kinetic back-up (
parameter 14-10 Mains Failure
).
Connect a brake resistor.
5.2.8 WARNING/ALARM 8, DC Undervoltage
Cause
If the DC-link voltage drops below the undervoltage limit, the drive checks for 24 V DC back-up supply. If no 24 V DC back-up supply
is connected, the drive trips after a fixed time delay. The time delay varies with unit size.
Troubleshooting
Check that the supply voltage matches the drive voltage.
Perform an input voltage test.
Perform a soft-charge circuit test.
5.2.9 WARNING/ALARM 9, Inverter Overload
Cause
The drive has run with more than 100% overload for too long and is about to cut out. The counter for electronic thermal inverter
protection issues a warning at 98% and trips at 100% with an alarm. The drive cannot be reset until the counter is below 90%.
Troubleshooting
Compare the output current shown on the LCP with the drive rated current.
Compare the output current shown on the LCP with the measured motor current.
Show the thermal drive load on the LCP and monitor the value. When running above the drive continuous current rating, the
counter increases. When running below the drive continuous current rating, the counter decreases.
5.2.10 WARNING/ALARM 10, Motor Overload Temperature
Cause
According to the electronic thermal protection (ETR), the motor is too hot.
Select 1 of these options:
The drive issues a warning or an alarm when the counter is >90% if
parameter 1-90 Motor Thermal Protection
is set to warning
options.
The drive trips when the counter reaches 100% if
parameter 1-90 Motor Thermal Protection
is set to trip options.
The fault occurs when the motor runs with more than 100% overload 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 that the motor data in
parameters 1-20
to
1-25
is set correctly.
If an external fan is in use, check that it is selected in
parameter 1-91 Motor External Fan
.
Running AMA in
parameter 1-29 Automatic Motor Adaptation (AMA)
tunes the drive to the motor more accurately and reduces
thermal loading.
5.2.11 WARNING/ALARM 11, Motor Thermistor Overtemp
Cause
The motor thermistor indicates that the motor temperature is too high.
Troubleshooting
Check for motor overheating.
Check that the thermistor is securely connected.
Check if the motor is mechanically overloaded.
When using terminal 53 or 54, check that the thermistor is connected correctly between either terminal 53 or 54 (analog voltage
input) and terminal 50 (+10 V supply). Also check that the terminal switch for 53 and 54 is set for voltage. Check that
parameter
1-93 Thermistor Resource
selects 53 or 54.
When using terminal 18, 19, 31, 32, or 33 (digital inputs), check that the thermistor is connected correctly between the digital
input terminal used (digital input PNP only) and terminal 50. Select the terminal to use in
parameter 1-93 Thermistor Resource
.
AU373327181955en-000101 / 130R1208 | 357
Danfoss A/S © 2021.08
Troubleshooting
VLT® AutomationDrive EZ FC 321
Programming Guide
