Lenze 8200 motec Instructions De Montage page 9

Thermal motor monitoring
Description
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With the I t monitoring you can monitor self-ventilated three-phase AC motors thermally
without sensors.

Note!
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The I
ƒ
thermal motor utilisation from the motor currents measured.
However, the I
ƒ
influences on the motor utilisation cannot be detected, like changed
cooling conditions (e.g. cooling air flow interrupted or too warm).
You can only obtain full motor protection if the motor is equipped with a
ƒ
PTC thermistor or a thermal contact.

Warnings!
If you use the I
monitoring:
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The I
ƒ
In UL-approved systems no additional protective measures for the motor
ƒ
are required.
For devices from software version V3.9 (nameplate data: E82xV... xx 39), an
additional setting is required!
Activate the starting value 50% for the I
ƒ
Add 128 to the value displayed in Code C0311.
–
Example:
ƒ
C0311 = 1 (Lenze setting)
–
Setting for UL-approved systems: C0311 = 129
–
EDK82MV752-BB DE/EN/FR 2.1
xt monitoring is based on a mathematical model which calculates a
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xt monitoring is no full motor protection, since other
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xt function in UL-approved systems for thermal motor
xt function is UL-approved.
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xt function:

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