160
Check first when you have troubles
5.6.3 Inverter generates abnormal noise.
Check that a fan cover is correctly reinstalled when replacing a cooling fan.
An AC reactor is built-in and a greater noise than at driving is produced during regeneration operation. But it
is not a fault.
5.6.4 Motor generates heat abnormally
Is the fan for the motor is running? (Check for accumulated dust.)
Check that the load is not too heavy. Lighten the load.
Check that the inverter output voltages (U, V, W) balanced.
Check that the
Pr. 0 Torque boost
setting is correct.
Was the motor type set? Check the setting of
Pr. 71 Applied motor
.
When using any other manufacturer's motor, perform offline auto tuning.
(Refer to page 71.)
5.6.5 Motor rotates in opposite direction
Check that the phase sequence of output terminals U, V and W is correct.
Check that the start signals (forward rotation, reverse rotation) are connected properly.
5.6.6 Speed greatly differs from the setting
Check that the frequency setting signal is correct. (Measure the input signal level.)
Check that the
Pr. 1, Pr. 2, Pr. 19, Calibration parameter C2 to C7
settings are correct.
Check that the input signal lines are not affected by external noise.
(Use shielded cables)
Check that the load is not too heavy.
Check that the
Pr. 31
to
Pr. 36
(frequency jump) settings are correct.
5.6.7 Acceleration/deceleration is not smooth
Check that the acceleration and deceleration time settings are not too short.
Check that the load is not too heavy.
Check that the torque boost (
Pr. 0, Pr. 46, Pr. 112
) setting is not too large and the stall prevention function is
not activated under V/F control.
5.6.8 Motor current is large
Check that the load is not too heavy.
Check that the
Pr. 0
Torque boost
setting is appropriate.
Check that the
Pr. 3 Base frequency
setting is appropriate.
Check that the
Pr. 14 Load pattern selection
setting is appropriate.
Check that the
Pr. 19 Base frequency voltage
setting is appropriate.
5.6.9 Speed does not increase
Check that the maximum frequency
(Pr. 1)
setting is correct. (If you want to run the motor at 120Hz or more,
set
Pr. 18 High speed maximum frequency
.
(Refer to chapter 4 of
the instruction manual (applied).)
)
Check that the load is not too heavy.
(In agitators, etc., load may become heavier in winter.)
Check that the torque boost
(Pr. 0, Pr. 46, Pr. 112)
setting is not too large and the stall prevention function is
not activated under V/F control.
5.6.10 The motor and machine vibrate.
Set
Pr. 19 Base frequency voltage
to the rated motor voltage under V/F control.
Check for any mechanical looseness.
Summary of Contents for FR-A741-11K
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