Motor Is Too Hot - YASKAWA Z1000 Technical Manual

6.9 Troubleshooting without Fault Display
n Motor Rotates in the Opposite Direction from the Run Command
Cause
Phase wiring between the drive and motor is incorrect.
The forward direction for the motor is set up incorrectly.
The motor is running at almost 0 Hz and the Speed
Search estimated the speed to be in the opposite
direction.
Note: Check the motor specifications for the forward and reverse directions. The motor specifications will vary depending on the manufacturer
of the motor.
n Motor Rotates in One Direction Only
Cause
The drive prohibits reverse rotation.
u

Motor is Too Hot

Cause
The load is too heavy.
The air around the motor is too hot.
Insufficient voltage insulation between motor phases.
The motor fan has stopped or is clogged.
The carrier frequency is too low.
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• Check the motor wiring.
• Switch two motor cables (U, V, and W) to reverse motor direction.
• Connect drive output terminals U/T1, V/T2, and W/T3 in the right order to match motor
terminals U, V, and W.
• Change the setting of parameter b1-14.
Typically, forward is designated as being counterclockwise when looking from the motor shaft
(see figure below).
1. Forward Rotating Motor (looking down the motor shaft)
2. Motor Shaft
• Disable bi-directional search (b3-14 = 0) so that Speed Search is performed only in the
specified direction.
• Check parameter b1-04.
• Set parameter b1-04 to 0 to allow the motor to rotate in reverse.
If the load is too heavy for the motor, the motor will overheat as it exceeds its rated torque value
for an extended period of time.
Keep in mind that the motor also has a short-term overload rating in addition to the possible
solutions provided below:
• Reduce the load.
• Increase the acceleration and deceleration times.
• Check the values set for the motor protection (L1-01, L1-02) as well as the motor rated current
(E2-01).
• Increase motor capacity.
• Check the ambient temperature.
• Cool the area until it is within the specified temperature range.
When the motor cable is long, high voltage surges occur between the motor coils and drive
switching.
Normally, surges can reach up to three times the drive input power supply voltage.
• Use a motor with a voltage tolerance higher than the max voltage surge.
• Use an inverter-duty motor rated for use with AC drives when using the motor on drives rated
higher than 208 V.
• Install an AC reactor on the output side of the drive. The carrier frequency should be set to 2
kHz when installing an AC reactor.
Check the motor fan.
Increase the carrier frequency to lower the current harmonic distortion and lower the motor
temperature.
YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
Possible Solutions
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Possible Solutions
Possible Solutions