A.5 Drive Derating Data
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 329
Specifications
A
Figure A.2
Figure A.2 Ambient Temperature and Installation Method Derating
◆ Altitude Derating
Yaskawa recommends referencing two standards when considering altitude
derating. These standards are:
• ANSI/IEEE C 37.40: Service Conditions and Definitions for High Voltage
Fuses, Distributor Enclosed Single Pole Air Switches and Accessories
• IEC 282-1.2: High Voltage Fuse
■ Drive Derating
Power conversion equipment must be de-rated above a certain altitude (usually
1000 meters). Equipment that depends on air for its insulating and cooling medium
has a higher temperature rise and a lower dielectric strength value when operated at
altitudes higher than 1000 meters (3300 feet). Application of the correct de-rating
factors is necessary to prevent drive failure.
The effect of high altitudes may eventually result in thermal damage to the power
semi-conductors and related components (reduced effectiveness of the heat sinks)
as well as lower dielectric withstand capabilities. High altitude de-rating is,
therefore, an important consideration during the initial application of the drive.
Drive
Rating
Ambient temp C
Parameter Setting
(L8-12)
2:NEMA Type1
1:Side by side mounting
0:IP20
Ambient and Installation Method
Temperature Derating
o
o
o
o
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