Danfoss VLT Decentral Drive FCD 302 Operating Manual page 37

Maintenance, Diagnostics, a...
WARNING/ALARM 2, Live zero error
This warning or alarm only appears if programmed in
parameter 6-01 Live Zero Timeout Function. The signal on 1
of the analog inputs is less than 50% of the minimum
value programmed for that input. Broken wiring or a faulty
device sending the signal can cause this condition.
Troubleshooting
•
Check connections on all analog mains terminals.
- Control card terminals 53 and 54 for
signals, terminal 55 common.
- ®
VLT General Purpose I/O MCB 101
terminals 11 and 12 for signals, terminal
10 common.
- ®
VLT Analog I/O Option MCB 109
terminals 1, 3, and 5 for signals,
terminals 2, 4, and 6 common.
•
Check that the frequency converter programming
and switch settings match the analog signal type.
•
Perform an input terminal signal test.
WARNING/ALARM 3, No motor
No motor is 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
for a fault in the input rectifier. Options are programmed in
parameter 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 DC-link 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 DC-link voltage (DC) is lower than the low voltage
warning limit. The limit depends on the frequency
converter voltage rating. The unit is still active.
WARNING/ALARM 7, DC overvoltage
If the DC-link voltage exceeds the limit, the frequency
converter trips after a certain time.
Troubleshooting
•
Connect a brake resistor.
•
Extend the ramp time.
•
Change the ramp type.
•
Activate the functions in parameter 2-10 Brake
Function.
•
Increase parameter 14-26 Trip Delay at Inverter
Fault.
MG04F502
Operating Guide
•
WARNING/ALARM 8, DC under voltage
If the DC-link voltage drops below the undervoltage limit,
the frequency converter checks for 24 V DC back-up
supply. 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
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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
•
•
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WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot.
Select 1 of these options:
•
•
The fault occurs when the motor runs with more than
100% overload for too long.
Troubleshooting
•
•
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If the alarm/warning occurs during a power sag,
use kinetic back-up (parameter 14-10 Mains
Failure).
Check that the supply voltage matches the
frequency converter voltage.
Perform an input voltage test.
Perform a 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 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.
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.
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 are set correctly.
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