Eliminated from:
- Documentation for i700 servo inverter V01.04.00.9125
- i700 servo inverter V01.04.00.9125
Behaviour of the new version:
The motor utilisation (I²xt) monitoring functionality in the controller has recently been extended. Now, the i700 servo inverter can inhibit itself when an adjustable error threshold is exceeded to protect the motor from overload.
What happens? In the i700, the thermal motor utilisation (i²xt) is calculated from the measured motor currents. The actual motor utilisation is displayed via 0x2D4F (or 0x354F).
Contrary to the description in the documentation for the i700, the monitoring function in the i700 only sends a warning to the higher-level controller if the set warning threshold for motor overload (0x2D4E or 0x354E) is exceeded. The PLC program in the controller then has to respond to the warning sent by the i700 to protect the motor from further overload. I. e. the i700 does not inhibit itself.
When does the problem occur? The problem occurs when using the motor utilisation (i²xt) monitoring function in the i700 servo inverter.
Which products are affected? - Documentation for i700 servo inverters ≤ V01.03.08.9047
Short-term measures/recommendations: To prevent serious thermal overload of the motor, users have to respond to the warning output by the i700 via the PLC program in the controller. Users can e.g. reduce the machine power or inhibit the controller.
Evaluation: The implemented behaviour of the motor utilisation (I²xt) monitoring function is not described correctly in the documentation.
