3.1.8.3.5 Motor Overload Protection (i2t)
This feature limits the overcurrent injected into the motor to prevent damage from overheating.
3.1.8.3.5.1 Overview
If the servo drive generates a current above the nominal current, the heat in the motor’s surroundings
accumulates which the cooling systems will have to dissipate.
If the accumulated heat exceeds the cooling system’s capabilities, the system reaches its thermal limits and the
motor or the surrounding elements can be permanently damaged.
This feature will evaluate the “overheating” status of the motor. If the motor is overheated more than the
allowed limit, this feature will limit the RMS value of phase currents to protect the motor from being
overheated beyond the permitted limits.
Note
This feature doesn’t directly measure the motor temperature. It is only a limiting feature which doesn’t
allow the motor to overheat.
3.1.8.3.5.2 Requirements
To use this feature, the following parameters must be set properly according to the motor datasheet:
0x6075 Motor rated current Motor rated current (rms value)
0x6073 Motor maximum current Motor maximum current (rms value)
0x200A i2t Parameters to activate the i2t feature
3.1.8.3.5.3 Description of Subitems for 0x200A:
0x200A:10x200A:1 Enable: Set to 1 to enable the protection.
0x200A:20x200A:2 Peak Time: Maximum time period [ms] in which the motor is allowed to have its maximum current
0x200A:30x200A:3 Percent max: The percent of the maximum transient energy allowable in the motor.
0x200A:40x200A:4 Protection active: When this flag is set, the output current is limited to equal or less the nominal current.
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