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Optional Variable Frequency Drive
Table 24. Warning and alarm definitions and troubleshooting
Warning/Alarm
Description / Probable Cause
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.
WARNING 1, 10
Max. 15 mA or minimum 590 Ω. This condition
Volts low
can be caused by a short in a connected
potentiometer or improper wiring of the
potentiometer.
This warning or alarm only appears if
programmed by the user in 6-01 Live Zero
Timeout Function. The signal on one of the
WARNING/ALARM
analog inputs is less than 50% of the
2, Live zero error
minimum value programmed for that input.
Broken wiring or faulty device sending the
signal can cause this condition.
A phase is missing on the supply side, or the
mains voltage imbalance is too high. This
WARNING/ALARM
message also appears for a fault in the input
4, Mains phase loss
rectifier on the frequency converter. Options
are programmed at 14-12 Function at Mains
Imbalance.
The intermediate circuit voltage (DC) is higher
WARNING 5, DC link
than the high voltage warning limit. The limit is
voltage high
dependent on the frequency converter voltage
rating. The unit is still active.
The intermediate circuit voltage (DC) is lower
WARNING 6, DC link
than the low voltage warning limit. The limit is
voltage low
dependent on the frequency converter voltage
rating. The unit is still active.
If the intermediate circuit voltage exceeds the
WARNING/ALARM
limit, the frequency converter trips after a
7, DC overvoltage
time.
If the intermediate circuit voltage (DC link)
drops below the under-voltage limit, the
frequency converter checks if a 24 V DC
WARNING/ALARM
backup supply is connected. If no 24 V DC
8, DC under voltage
backup supply is connected, the frequency
converter trips after a fixed time delay. The
time delay varies with unit size.
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%
WARNING/ALARM
and trips at 100%, while giving an alarm. The
9, Inverter overload
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.
According to the electronic thermal protection
(ETR), the motor is too hot. Select whether
WARNING/ALARM
the frequency converter issues a warning or
10, Motor overload
an alarm when the counter reaches 100% in
temperature
1-90 Motor Thermal Protection. The fault
occurs when the motor runs with more than
100% overload for too long.
A–4
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.
•
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.
Check the supply voltage and supply currents to the frequency converter.
•
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, the solution is to use kinetic back-
up (14-10 Mains Failure).
•
Check that the supply voltage matches the frequency converter 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.
•
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 Motor data in parameters 1-20 to 1-25 are set correctly.
•
If an external fan is in use, check in 1-91 Motor External Fan that it is selected.
•
Running AMA in 1-29 Automatic Motor Adaptation (AMA) tunes the frequency
converter to the motor more accurately and reduces thermal loading.
ARTC-SVX010A-EN
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