Altitude Derating - YASKAWA V1000 Series Installation & Start-Up Manual

Figure A.2
Drive
Rating
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.
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
Ambient and Installation Method
Temperature Derating
2:NEMA Type1
1:Side by side mounting
o
Ambient temp C
Parameter Setting (L8-12)
A.5 Drive Derating Data
o
o o
0:IP20
A
329