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Hi,
A IE2 motor was replaced with an IE3 motor on a moderate radial fan with a directly driven fan about 80cm diameter, 15cm thick. I cannot remember the IE2 behavior but as expected the 3RV1 thermal protectot trips immediately after starting. It has been replaced with a 3RV2 but then the main fuse trips. I checked the motor currents and they are as expected about 8.7x the nominal current at startup, which is expected for locked rotor but they will not drop after several seconds. I can turn the fan freely, so there is no mechanical friction.
My question is: How long can this motor 1LE10031DA334AA4 cope with currents of about 200A when its nominal current is 27A in delta? I cut power after about 10s. Is the damage already done?
Based on your description, the motor is experiencing prolonged high inrush current (8.7x nominal) even without mechanical load, indicating a potential issue beyond typical starting behavior. The tripping of both the 3RV1 thermal overload and the main fuse confirms this.
The 1LE10031DA334AA4 motor, with a nominal current of 27A in delta, is designed to withstand inrush currents for a very short duration. While exact withstand times aren't publicly available, exceeding 10 seconds at 200A (7.4x nominal) significantly increases the risk of thermal damage to the windings.
Damage Assessment: It's highly probable that some level of thermal stress has occurred to the motor windings. Continuing to start the motor without diagnosing the root cause could lead to complete failure.
Recommendations:
Disclaimer: This assessment is based on the provided information. A qualified electrician or Siemens service technician should perform a comprehensive inspection for accurate diagnosis and repair.
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