shows the limit values for voltage warnings/
alarms. The values are the DC-link voltage values of the
frequency converter with a tolerance of ±5 %. The
corresponding mains voltage equals the DC-link voltage
value divided by 1.35.
3 x 200–
240 V
3 x 380–
500 V
3 x 525–
600 V
Warning/alarm 8, DC under
voltage [VDC]
185
373
532
Warning 6, DC link voltage low
[VDC]
205
410
585
Warning 5, DC link voltage high
w/o brake [VDC]
390
810
943
Warning 5, DC link voltage high
w brake [VDC]
405
840
965
Warning/alarm 7, DC overvoltage
[VDC]
410
855
975
Table 6.4 Voltage Warning/Alarm Limits
WARNING/ALARM 8, DC under voltage
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.
WARNING/ALARM 9, Inverter overload
The frequency converter 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 frequency
converter cannot be reset until the counter is below 90%.
Troubleshooting
•
Compare the output current shown on the LCP
with the frequency converter rated current.
•
Compare the output current shown on the LCP
with the measured motor current.
•
Show the thermal frequency converter load on
the LCP and monitor the value. When running
above the frequency converter continuous
current rating, the counter increases. When
running below the frequency converter
continuous current rating, the counter decreases.
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot.
Select 1 of these options:
•
The frequency converter issues a warning or an
alarm when the counter is >90% if
parameter 1-90 Motor Thermal Protection
is set to
warning options.
•
The frequency converter 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 frequency converter
to the motor more accurately and reduces
thermal loading.
WARNING/ALARM 11, Motor thermistor overtemp
Check whether the thermistor is disconnected. Select
whether the frequency converter issues a warning or an
alarm in
parameter 1-90 Motor Thermal Protection
.
Troubleshooting
•
Check for motor overheating.
•
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 or 54 is set for voltage.
Check that
parameter 1-93 Thermistor Resource
selects terminal 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
.
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
warning from a warning-only condition to a warning
followed by an alarm.
Troubleshooting
Programming Guide
MG33MP02
Danfoss A/S © 10/2018 All rights reserved.
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Summary of Contents for VLT AutomationDrive FC 302
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