Motor overtemp. prewarning

What does E251 mean?

The motor is too hot. This warning is generated when the motor temperature (S-0-0383) exceeds the motor warning temperature (S-0-0201). If the temperature further increases above the motor shutdown temperature (S-0-0204), F219 Motor overtemp. shutdown will be generated. For MKD and MHD motors, S-0-0201 is 140°C and S-0-0204 is 150°C.

• The motor became overloaded; the effective torque required was above the permissible continuous standstill torque for too long.
• Failure or contamination of the motor cooling unit (fan, heatsink, air passages).

Click steps to track your progress.

1. 1

   Monitor the S-0-0383 (Motor temperature) parameter in the Indramat DIAX04 SSE-03VRS drive controller to observe the current motor temperature and its trend.

2. 2

   Verify the motor loading. Check the effective torque and current draw against the motor's nominal and continuous standstill torque ratings.

3. 3

   Inspect the motor's cooling system (fan, heatsink, cooling fins) for obstructions, dust accumulation, or damage. Clean any blocked air passages.

4. 4

   Check the application for any recent changes that might increase mechanical load, friction, or environmental temperature affecting motor cooling.

5. 5

   Ensure parameters S-0-0201 (Motor warning temperature) and S-0-0204 (Motor shutdown temperature) are correctly set for the specific Indramat MKD/MHD motor type (e.g., 140°C and 150°C, respectively).