Lenze E94AxHE Servo Drives 9400 HighLine (Firmware 01-37) - Manual (Page 98)

9400 HighLine | Parameter setting & configuration
Motor interface
Parameter setting | Motor monitoring (I²xt)
98 Firmware 1.37 - 09/2006
L
See also: Display/edit motor data in the »Engineer« (C 67)
Accept/adapt route data (C 69)
5.4.1 Motor monitoring (I²xt)
The "9400 Servo Drives" are provided with an extended, sensorless thermal I 2 xt motor
monitoring which is based on a mathematical model that calculates a thermal motor
utilisation from the detected motor currents.
r The calculation considers the speed dependency of the torque (difference between
standstill torque and rated torque).
r C00066 indicates the calculated motor utilisation in [%].
r If the motor exceeds the advance warning threshold set in C00127 , the error message
"I2t motor overload OC8" is output and the reaction set in C00606 (default setting:
"Warning") is activated.
r If the switch-off threshold set in C00120 is exceeded, the error message "I2t motor
overload OC6" is output and the reaction "Fault" is activated.

Stop!
The I
2
xt motor monitoring is no full motor protection!
Since the motor utilisation calculated in the thermal model gets lost after mains
switching, the following operating states cannot be determined correctly:
• Restarting (after mains switching) of a motor that is already very heated.
• Change of the cooling conditions (e.g. cooling air flow interrupted or too
warm).
A full motor protection requires additional measures as e.g. the evaluation of
temperature sensors that are situated directly in the winding of thermal
contacts.