Environmental Installation Conditions - CD Automation Revo C 3PH User Manual

9.5 Environmental installation conditions

Ambient temperature
Storage temperature
Installation place
Altitude
Humidity
Pollution Level
9.6 Derating Curve and Thermal conditions
The nominal current of the units in specification are referred to continuos service at 40 ambient
temperature. For higher temperature multiply the nominal current times derating coefficient K below
Represented:
9.7 Calculating flow capacity of the fan
All the thyristor units when are in conduction produces power loss that is dissipated inside cubicle in
terms of heating. Due to this fact the internal temperature of cubicle is higher than ambient
temperature. To be cooled the thyristor need of fresh air cooling and to do it is normally used a fan
mounted on the front door or on the roof of the cabinet.
Procedure to size Fan air mass flow
indicated in the manual related to the current (Output feature and Internal fuse Chapter)
Qv

V f *

tc ta
The formulas used are for information only and is not a substitute for a proper thermal rating
done by a qualified person.
Neut-Eng-REVO-C-3PH-300-800A-Thyristors-Units
0-40°C (32-104°F) at nominal current. Over 40°C (104°F) use the derating curve.
-25°C to 70°C -13°F to 158°F
Don't install at direct sun light, where there are conductive dust, corrosive gas,
vibration or water and also in salty environmental.
Up to 1000 meter over sea level. For higher altitude reduce the nominal current of
2% for each 100m over 1000m
From 5 to 95% without condense and ice
Up to 2nd Level ref. IEC 60947-1 6.1.3.2
(V)
: see power loss for each thyristor and fuse mounted
Qv= total power losses (w)
(thyristor + fuse power loss)
ta= ambient temperature (°C)
tc= cabinet temperature (°C)
V= fan air mass flow (m3/h)
f= altitude coefficient (see table on right)
REVO C
Altitude
0:100
100:250 meters f=3.2 m3k/Wh
250:500 meters f=3.3 m3k/Wh
500:750 meters f= 3.4 m3k/Wh
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User's Manual
meters f= 3.1 m3k/Wh