Motor Is Too Hot - YASKAWA L1000A Technical Manual

4.7 Setup Troubleshooting and Possible Solutions
Cause
Selection for the sink/source mode and the internal/external power
supply is incorrect.
Speed reference is too low.
The brake does not release or motor contactor is not closed.
STOP
The button is enabled (o2-02=1) and was pressed
when the drive was started from a REMOTE source.
■
Motor Rotates in the Opposite Direction from the Up/Down Command
Cause
Phase wiring between the drive and motor is incorrect.
Drive control circuit terminals for the Up and Down commands are
switched.

◆ Motor is Too Hot

Cause
The load is too heavy.
The air around the motor is too hot.
The drive is operating in a vector control mode but Auto-Tuning
has not yet been performed.
Insufficient voltage insulation between motor phases.
The motor fan has stopped or is clogged.
◆ Drive Does Not Allow Selection the Desired Auto-Tuning Mode
Cause
The desired Auto-Tuning mode is not available for the selected
control mode.
◆ Electrical Noise From Drive or Output Lines When the Drive is Operating
Cause
PWM switching in the drive generates excessive noise.
◆ Ground Fault Circuit Interrupter (ELCB/GFCI) Trips During Run
Cause
Excessive leakage current trips ELCB/GFCI ground fault circuit
interrupter.
136
Check the position of the jumper and setting for S3.
• Check the speed reference monitor (U1-01).
• Increase the speed reference above the minimum output speed (E1-09).
• Make sure speed references are set properly and the speed selection works properly. If using an analog signal make
sure the input signal is present at the time the Up/Down command is issued.
Check the brake and motor contactor sequence.
• When the STOP button is pressed, the drive will decelerate to stop.
• Switch off the Up/Down command and then re-enter a new Up/Down command.
• o2-02 is set to 0 by default, i.e. the Stop button is disabled.
Check the motor wiring. Perform the steps described in
Setup on page 99.
• Check the control circuit wiring.
• Correct any fault wiring.
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.
• Lower the acceleration and deceleration ramps. (Increase the acceleration time and deceleration time)
• 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.
• Perform Auto-Tuning.
• Calculate the motor value and reset the motor parameters. Refer to E2: Motor Parameters on page 170.
• Change the motor control method to V/f Control (A1-02 = 0).
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.
• Install an AC reactor on the output side of the drive. Make sure the output reactor can handle frequencies in the
range of the drive carrier frequency.
Check the motor fan.
• Check if the desired tuning mode is available for the selected control mode. Refer to Auto-Tuning on page 104.
• Change the motor control method by setting A1-02.
• Lower the carrier frequency (C6-03).
• Install a noise filter on the input side of drive input power.
• Install a noise filter on the output side of the drive.
• Place the wiring inside a metal conduit to shield it from switching noise.
• Ground the drive and motor properly.
• Separate the main circuit wiring and the control lines.
• Make sure wires and the motor have been properly grounded.
• Increase the ELCB/GFCI sensitivity or use ELCB/GFCI with a higher threshold.
• Lower the carrier frequency (C6-03).
• Reduce the length of the cable used between the drive and the motor.
• Install a noise filter or reactor on the output side of the drive.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
Possible Solutions
Refer to Control I/O Configuration on page 75
Possible Solutions
Motor Rotation Direction Setup on page 99
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
and PG Encoder