Lenze E82MV752 4Bxxx Manuel d'utilisation
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EDK82MV752-BB DE/EN/FR 1.0
Thermal motor monitoring
Description
With the I
2
t monitoring you can monitor self-ventilated three-phase AC motors thermally
without sensors.
Note!
The I
2
xt function is UL-approved.
ƒ
The I
2
xt monitoring is based on a mathematical model which calculates a
thermal motor utilisation from the motor currents measured.
ƒ
In UL-approved systems no additional protective measures for the motor
are required.
ƒ
However, the I
2
xt monitoring is no full motor protection, since other
influences on the motor utilisation cannot be detected, like changed
cooling conditions (e.g. cooling air flow interrupted or too warm).
ƒ
You can only obtain full motor protection if the motor is equipped with a
PTC thermistor or a thermal contact.
Codes for parameter setting
Code
Possible settings
IMPORTANT
No.
Name
Lenze Selection
C0120 I
2
t switch-off
0
0
= inactive
{1 %}
200 Reference: apparent motor
current (C0054)
Reference to active motor
current (C0056) possible, see
C0310