Danfoss VLT FC 102 Series Design Manual page 201

General Specifications and ...
The warning/alarm information below defines each
warning/alarm condition, provides the probable cause for
the condition, and details a remedy or troubleshooting
procedure.
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.
A short circuit in a connected potentiometer or improper
wiring of the potentiometer can cause this condition.
Troubleshooting
Remove the wiring from terminal 50. If the
warning clears, the problem is with the wiring. If
the warning does not clear, replace the control
card.
WARNING/ALARM 2, Live zero error
This warning or alarm only appears if programmed in
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. Broken wiring or faulty device
sending the signal can cause this condition.
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 frequency converter programming
and switch settings match the analog signal type.
Perform Input Terminal Signal Test.
WARNING/ALARM 4, Line phase loss
A phase is missing on the supply side, or the line voltage
imbalance is too high. This message also appears for a
fault in the input rectifier on the adjustable frequency
drive. Options are programmed at 14-12 Function at Mains
Imbalance.
Troubleshooting
Check the supply voltage and supply currents to
the adjustable frequency drive.
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
frequency converter voltage rating. The unit is still active.
MG11BC22
Design Guide
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
adjustable frequency drive trips after a time.
Troubleshooting
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
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 giving an alarm. The
frequency converter cannot be reset until the counter is
below 90%.
The fault is that the frequency converter has run with
more than 100% overload for too long.
Troubleshooting
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.
Danfoss A/S © Rev. 06/2014 All rights reserved.
Connect a brake resistor
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)
Make sure that the supply voltage matches the
adjustable frequency drive voltage.
Perform input voltage test.
Perform soft charge circuit test.
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 increases. When running below the
frequency converter continuous current rating,
the counter decreases.
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