Danfoss FC 100 Series User Manual

8.1.1 Fault Messages
WARNING 1, 10 volts low
The control card voltage is below 10 V from terminal 50.
Remove some of the load from terminal 50, as the 10 V supply
is overloaded. Max. 15 mA or minimum 590 Ω.
This condition can be caused by a short in a connected
potentiometer or improper wiring of the potentiometer.
Troubleshooting: Remove the wiring from terminal 50. If the
warning clears, the problem is with the customer wiring. If the
warning does not clear, replace the control card.
WARNING/ALARM 2, Live zero error
This warning or alarm will only appear if programmed by the
user in par. 6-01 Live Zero Timeout Function. The signal on one
of the analog inputs is less than 50% of the minimum value
programmed for that input. This condition can be caused by
broken wiring or faulty device sending the signal.
Troubleshooting:
Check connections on all the analog input terminals.
Control card terminals 53 and 54 for signals, terminal
55 common. MCB 101 terminals 11 and 12 for
signals, terminal 10 common. MCB 109 terminals 1,
3, 5 for signals, terminals 2, 4, 6 common).
Check that the drive programming and switch
settings match the analog signal type.
Perform Input Terminal Signal Test.
WARNING/ALARM 3, No motor
No motor has been connected to the output of the frequency
converter. This warning or alarm will only appear if program-
med by the user in par. 1-80 Function at Stop.
Troubleshooting: Check the connection between the drive
and the motor.
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 for a fault in the input rectifier on
the frequency converter. Options are programmed at
par. 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 is dependent on the drive
voltage rating. The frequency converter 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 drive
voltage rating. The frequency converter is still active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
frequency converter trips after a time.
Troubleshooting:
Connect a brake resistor
Extend the ramp time
Change the ramp type
Activate functions in par. 2-10 Brake Function
Increase par. 14-26 Trip Delay at Inverter Fault
WARNING/ALARM 8, DC under voltage
If the intermediate circuit voltage (DC) drops below the under
voltage limit, the frequency converter checks if a 24 V backup
supply is connected. If no 24 V backup 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 frequen-
cy converter voltage.
Perform Input voltage test
Perform soft charge and rectifier circuit test
WARNING/ALARM 9, Inverter overloaded
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 gives a warning at 98%
and trips at 100%, while giving an alarm. The frequency
converter cannot be reset until the counter is below 90%.
The fault is that the frequency converter is overloaded by
more than 100% for too long.
Troubleshooting:
Come the output current shown on the LCP keypad
with the drive rated current.
Come the output current shown on the LCP keypad
with measured motor current.
Display the Thermal Drive Load on the keypad and
monitor the value. When running above the drive
continuous current rating, the counter should
increase. When running below the drive continuous
current rating, the counter should decrease.
NOTE: See the derating section in the Design Guide for more
details if a high switching frequency is required.
Troubleshooting
VLT
®
HVAC Drive Operating Instructions
MG.11.AD.02 - VLT
®
is a registered Danfoss trademark 127
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Danfoss FC 100 Series Specifications

General

Brand	Danfoss
Model	FC 100 Series
Category	Media Converter
Language	English