Thermal Motor Monitoring - Lenze Global Drive 8200 vector Instructions De Montage

2 Safety instructions

Thermal motor monitoring

Thermal motor monitoring
Description
2
With the I t monitoring you can monitor self−ventilated three−phase AC motors thermally without
sensors.
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Note!
2
The I xt monitoring is based on a mathematical model which calculates a thermal
ƒ
motor utilisation from the motor currents measured.
However, the I
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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 PTC
ƒ
thermistor or a thermal contact.
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Warnings!
If you use the I
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The I xt function is UL−approved.
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In UL−approved systems no additional protective measures for the motor are
ƒ
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
–
94
2
xt monitoring is no full motor protection, since other influences on
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xt function in UL−approved systems for thermal motor monitoring:
l
2
xt function:
EDK82EV222 DE/EN/FR 13.0