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9 Mains and environment

9.2 Ambient conditions

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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23

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Unearthed power systems

IT systems are power systems with an isolated neutral. They are used in the following countries and

industry sectors:

• In the public supply system in France and Belgium

•Chemical industry

•Mining

• Island power supplies (own generator)

•Hospitals

•Ship's mains

• Crane, conveyor, and hoist systems

• Paper and pulp industry

Advantages of the IT systems are the high fire and operator safety. Furthermore there is no discon-

nection during the first earth fault.

9.2 Ambient conditions

9.2.1 Max. ambient temperature, motor/gearbox

The permissible load capacity depends on the ambient temperature. The load capacity also depends

on whether a geared motor or a motor without a gearbox is used.

 Tip!

If a geared motor is used, the derating starts from a temperature of 30 °C, in the case of a

motor without a gearbox it starts from 40 °C.

Depending on the site altitude, the following correction values k

result for geared motors:

opr

≤ 1000 m ≤ 2000 m ≤ 3000 m ≤ 4000 m

20 °C 1.15 1.04 0.92 0.81

30 °C 1 0.9 0.8 0.70

40 °C 0.8 0.72 0.64 0.56

50 °C 0.6 0.54 0.48 0.42

60 °C 0.4 0.36 0.32 0.28

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