Applicable Systems
GA700
GA500
A1000
V1000
J1000
Symptoms
The drive trips. The digital operator displays OL2, indicating drive overload. The drive's internal thermal protection has detected that the drive itself is overloaded beyond its rated capacity.
Possible Causes
- Drive operating in the overload region for too long
- Drive ambient temperature too high
- Drive cooling fan failed or airflow blocked
- Drive duty class setting too low for the application
Troubleshooting Steps
- Step 1: Check the drive ambient temperature and enclosure ventilation
Ambient temperature is within the drive rated range and ventilation is adequate - Step 2: Verify the drive cooling fan is operational and unobstructed
Fan is running and air flows freely through the heatsink - Step 3: Verify the drive is not operating continuously above its rated current
Drive current is within the continuous rated current - Step 4: If the load is genuinely too high, increase the drive capacity
Drive operates within its rated limits
How to Reset
To reset: 1) Reduce the drive load or improve cooling. 2) Allow the drive to cool. 3) Press RESET. Caution: Repeated drive overload trips damage the power semiconductors. Ensure the drive is correctly sized for the application.
Frequently Asked Questions
- Q: What is the difference between OL1 and OL2?
OL1 is motor overload protection, which is based on the motor rated current parameter and a thermal model of the motor. OL2 is drive overload protection, based on the drive's internal temperature sensors and rated current.
- Q: What is the drive overload capacity?
Yaskawa drives typically have 150% overload for 60 seconds (heavy duty) or 120% for 60 seconds (normal duty). The exact capacity depends on the duty class parameter setting and the drive model.
Source: Yaskawa A1000 Technical Manual, 2023
Category: PLC & VFD