Troubleshooting
6
6.10 Troubleshooting Without Fault Display
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 391
Causes Possible Solutions
The signal connections for forward run and reverse run on
the drive control circuit terminals and control panel side are
incorrect.
Correctly wire the control circuit.
The motor is running at almost 0 Hz and the Speed Search
estimated the speed to be in the opposite direction.
Set b3-14 = 0 [Bi-directional Speed Search = Disabled], then the drive will
only do speed search in the specified direction.
◆ The Motor Rotates in Only One Direction
Causes Possible Solutions
The drive will not let the motor rotate in reverse. Set b1-04 = 0 [Reverse Operation Selection = Reverse Enabled].
The drive did not receive a Reverse run signal and 3-Wire
sequence is selected.
Turn ON the terminals to which H1-xx = 0 [3-Wire Sequence] is set, and
then enable reverse operation.
◆ The Motor Is Too Hot
Causes Possible Solutions
The load is too heavy. • Decrease the load.
• Increase the acceleration and deceleration times.
• Examine the values set in L1-01 [Motor Overload (oL1) Protection], L1-
02 [Motor Overload Protection Time], and E2-01 [Motor Rated Current
(FLA)].
• Use a larger motor.
Note:
The motor also has a short-term overload rating. Examine this rating
carefully before setting drive parameters.
The motor is running continuously at a very low speed. • Change the run speed.
• Use a drive-dedicated motor.
The drive is operating in a vector control mode, but Auto-
Tuning has not been done.
• Do Auto-Tuning.
• Calculate motor parameter and set motor parameters.
• Set A1-02 = 0 [Control Method Selection = V/f Control].
The voltage insulation between motor phases is not
sufficient.
• Use a motor with a voltage tolerance that is higher than the maximum
voltage surge.
• Use a drive-dedicated motor that is rated for use with AC drives for
applications that use a motor on drives rated higher than 400 V class.
• Install an AC reactor on the output side of the drive and set C6-02 = 1
[Carrier Frequency Selection = 2.0 kHz].
Note:
When the motor is connected to the drive output terminals U/T1, V/T2,
and W/T3, surges occur between the drive switching and the motor coils.
These surges can be three times the drive input power supply voltage
(600 V for a 200 V class drive, 1200 V for a 400 V class drive).
The air around the motor is too hot. • Measure the ambient temperature.
• Decrease the temperature in the area until it is in the specified
temperature range.
The motor fan stopped or is clogged. • Clean the motor fan.
• Make the drive environment better.
◆ The Correct Auto-Tuning Mode Is Not Available
Causes Possible Solutions
The desired Auto-Tuning mode is not available for the
selected control mode.
Change the motor control method with parameter A1-02 [Control Method
Selection].
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