YASKAWA V1000 Series

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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.
Figure A.3 is provided as a quick reference to aid in derating the drive above specified altitude.
Note: This derate applies only to the inverter. However, if the inverter is placed in a pressurized cabinet so that the internal pressure is maintained at the value of atmospheric pressure
at 3300 ft. then there is no need for derate. Example: Heatsink is exposed to the outside and is not under positive pressure in an enclosed cabinet with forced air cooling or an
air-conditioning system. In such a case, derating is required.
102
100
98
96
94
92
90
2000
2500
3000 3500
4000
4500
5000
1500
1000
500
0
102
100
98
96
94
92
90
6560
8200
9840
11480
13120
14760
16400
4920
3280
1640
0
Altitude Derating for Yaskawa Inverters (meters)
Drive Output Current Rating
(% of Drive Nameplate Rating)
Altitude (meters)
Limit 400 V Class Models
Limit 200 V Class Models
Continuous Output Current
(%)
Altitude Derating for Yaskawa Inverters (feet)
Drive Output Current Rating
(% of Drive Nameplate Rating)
Altitude (feet)
Limit 400 V Class Models
Limit 200 V Class Models
Continuous Output Current
(%)
Figure A.3 Altitude Derating for Yaskawa Drives
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Motor Derating
Consult the motor manufacturer for the applicable altitude de-rating factor before applying the motor. As a general guideline, consult the NEMA standard
MG 1-14.04 (Operation of AC and DC Fractional- and Integral-HP Motors and Generators at Altitudes Above 3,300 feet (1000 meters). However, the
motor manufacturer's specific de-rating data is always preferable.
A.6 Drive Derating Data
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
291
A
Specifications