Danfoss VLT AutomationDrive FC 301 Instruction Manual page 44

Maintenance, Diagnostics an...
WARNING 5, DC link voltage high
The intermediate circuit voltage (DC) is higher than the
high-voltage warning limit. The limit is dependent on the
adjustable frequency drive voltage rating. The unit is still
active.
WARNING 6, DC link voltage low
The intermediate circuit voltage (DC) is lower than the low-
voltage warning limit. The limit is dependent on the
adjustable frequency drive voltage rating. The unit is still
active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
adjustable frequency drive trips after a time.
Troubleshooting
•
Connect a brake resistor.
7 7
•
Extend the ramp time.
•
Change the ramp type.
•
Activate the functions in 2-10 Brake Function.
•
Increase 14-26 Trip Delay at Inverter Fault.
•
If the alarm/warning occurs during a power sag,
use kinetic backup (14-10 Line Failure).
WARNING/ALARM 8, DC undervoltage
If the DC link voltage 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.
•
Perform a soft charge circuit test.
WARNING/ALARM 9, Inverter overload
The adjustable frequency 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%, while giving 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 the measured motor current.
42
Instruction Manual
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 1-90 Motor Thermal Protection. The fault
occurs when the motor runs with more than 100%
overload for too long.
Troubleshooting
WARNING/ALARM 11, Motor thermistor overtemp
Check whether the thermistor is disconnected. Select
whether the adjustable frequency drive issues a warning or
an alarm in 1-90 Motor Thermal Protection.
Troubleshooting
Danfoss A/S © Rev. 09/2014 All rights reserved.
•
Display the thermal drive load on the LCP and
monitor the value. When running above the
adjustable frequency drive continuous current
rating, the counter increases. When running
below the adjustable frequency drive continuous
current rating, the counter decreases.
•
Check for motor overheating.
•
Check if the motor is mechanically overloaded.
•
Check that the motor current set in 1-24 Motor
Current is correct.
•
Ensure that the motor data in parameters 1-20 to
1-25 are set correctly.
•
If an external fan is in use, check that it is
selected in 1-91 Motor External Fan.
•
Running AMA in 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.
•
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 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. Check that 1-93 Thermistor
Source selects terminal 18 or 19.
MG33AP22