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FT50
68
Without PG feedback, the V/F control mode is applied to the scenario where the motor is
without encoder speed feedback. In this control mode, only the rated parameters of the motor
need to be set correctly.
Problems and failures
Fault description and trouble shooting
Frequency
converter
overcurrent
The output current of the frequency converter is too large, over the
overcurrent point set by the software parameter, or the output
current reaches the maximum value of the frequency converter
hardware design range.
Check and trouble shoot
The power of the motor does not match the power of the
frequency converter
Acceleration time is too short
Motor overload
The output circuit of the frequency converter is grounded or
short-circuited
Motor parameters have not been set correctly
Reduce the torque boost (P1103.F), and adjust in 0.5% units
The motor is noisy
Appropriately increase the value of carrier frequency (P0202.F).
Notice that increasing the carrier frequency will increase the
leakage current, and increase the temperature rise of the
frequency converter. Needs to consider the frequency converter
derating.
Suddenly unload heavy
load, report overvoltage,
and report overvoltage
when decelerating
Confirm that P4924.F overvoltage speed out of control protection
is set to 1, and confirm whether the setting of overvoltage speed
out of control point is reasonable.
Suddenly increase the
load, report overcurrent,
and report overcurrent
when accelerating
Confirm whether the settings of overcurrent speed out of control
point P4926.F-P4927.F and overcurrent speed out of control
detection time P4928.F are reasonable.
7.3 Restart the Frequency Converter after a Fault
Table 7-1 restart the frequency converter after a fault
Stage
Trouble shooting
When a failure
occurs
Use the upper machine or the operation panel to view the latest eight fault
state through the parameters r4935-r4966.
Before fault
reset
When the fault occurs, get the fault code and related information through the
upper machine or the operation panel, find the cause of the fault and trouble
