Yaskawa J1000 Compact V/f Control Drive - Manual (Page 154)

n Motor is Too Hot
Cause Possible Solutions
The load is too heavy.
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.
The air around the motor is too hot.
• Check the ambient temperature.
• Cool the area until it is within the specified temperature range.
Insufficient voltage insulation between
motor phases.
When the motor is connected to terminals U/T1, V/T2, and W/T3, voltage
surges occur between the motor coils and drive switching.
Normally, surges can reach up to three times the drive input power supply
voltage (600 V for 200 V class, and 1200 V for 400 V class).
• Use a motor with voltage tolerance higher than the max voltage surge.
• Use a motor designed to work specifically with a drive when using a
400 V class unit.
• Install an AC reactor on the output side of the drive.
The motor fan has stopped or is clogged. Check the motor fan.
n oPE02 Error Occurs when Lowering the Motor Rated Current
Setting
Cause Possible Solutions
The motor rated current and the motor no-
load current settings in the drive are
incorrect.
The user is trying to set the motor rated current in E2-01 to a value lower
than the no-load current set in E2-03.
• Make sure that value set in E2-01 is higher than E2-03. Setting E2-01 <
E2-03 will trigger an oPE02 error.
• If it is necessary to set E2-01 lower than E2-03, first lower the value set
to E2-03, then change the setting in E2-01 as needed.
n Motor Stalls During Acceleration or With Large Loads
Cause Possible Solutions
Load is too heavy.
Take the following steps to resolve the problem:
• Reduce the load.
• Increase the acceleration time.
• Increase motor capacity.
• Although the drive has a Stall Prevention function and a Torque
Compensation Limit function, accelerating too quickly or trying to drive
an excessively large load can exceed the capabilities of the motor.
5.8 Troubleshooting without Fault Display
154 YASKAWA ELECTRIC TOEP C710606 26D YASKAWA AC Drive – J1000 Quick Start Guide