2 ambient conditions, 1 max. ambient temperature, motor/gearbox, Ambient conditions – Lenze DSD User Manual
Page 278: Max. ambient temperature, motor/gearbox, 9mains and environment
9
Mains and environment
9.2
Ambient conditions
278
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
ϑ
result for geared motors:
ϑ
opr
k
ϑ
≤ 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