Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 122

Warnings and Alarms
WARNING 3, No motor
No motor has been connected to the output of the
frequency converter.
WARNING/ALARM 4, Mains phase loss
A phase is missing on the supply side, or the mains
voltage imbalance is too high. This message also appears
in case of a fault in the input rectifier on the frequency
converter. Options are programmed in 14-12 Function at
Mains Imbalance.
Troubleshooting
•
Check the supply voltage and supply currents to
the frequency converter.
WARNING 5, DC link voltage high
The intermediate circuit voltage (DC) is higher than the
high-voltage warning limit. The limit depends on the
frequency converter 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 depends on the frequency
converter voltage rating. The unit is still active.
8 8
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
frequency converter trips after some time.
Troubleshooting
•
Connect a brake resistor.
•
Extend the ramp time.
•
Change the ramp type.
•
Activate the functions in parameter 2-10 Brake
Function.
•
Increase 14-26 Trip Delay at Inverter Fault.
WARNING/ALARM 8, DC under voltage
If the intermediate circuit voltage (DC link) drops below
the undervoltage limit, the frequency converter checks if a
24 V DC back-up supply is connected. If no 24 V DC back-
up supply is connected, the frequency converter trips after
a fixed time delay. The time delay varies with unit size.
Troubleshooting
•
Check that the supply voltage matches the
frequency converter voltage.
•
Perform an input voltage test.
•
Perform a soft charge circuit test.
WARNING/ALARM 9, Inverter overload
The frequency converter is about to cut out because of an
overload (too high current for too long). The counter for
electronic thermal inverter protection issues a warning at
98% and trips at 100%, while issuing an alarm. The
frequency converter cannot be reset until the counter is
below 90%.
120
Operating Instructions
Troubleshooting
•
•
•
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the frequency converter
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
•
•
•
•
•
•
WARNING/ALARM 11, Motor thermistor over temp
The thermistor might be disconnected. Select whether the
frequency converter issues a warning or an alarm in
parameter 1-90 Motor Thermal Protection.
Troubleshooting
•
•
•
•
•
Danfoss A/S © 08/2014 All rights reserved.
Compare the output current shown on the LCP
with the frequency converter 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
frequency converter continuous current rating,
the counter should increase. When running below
the frequency converter continuous current
rating, the counter should decrease.
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.
If an external fan is used, check that it is selected
in 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.
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.
MG11F502