A.6 Drive Derating Data
462 YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
◆ Carrier Frequency Derating
As the carrier frequency of the drive is increased above the factory default setting, the drive’s rated output current must
be derated according to Figure A.1.
Figure A.1
Figure A.1 Carrier Frequency Derating
◆ Temperature Derating
To ensure the maximum performance life, the drives output current must be derated like shown in Figure A.2 when the
drive is installed in areas with high ambient temperature. In order to ensure reliable drive overload protection, the
parameters L8-12 and L8-35 must also be set according to the installation conditions.
■
Parameter Settings
0: IP00 Enclosure
Drive operation between -10°C and 50°C allows 100% continuous current without derating.
2: IP20/NEMA 1, UL Type 1 Enclosure
Drive operation between -10°C and 40°C allows 100% continuous current without derating. Operation between 40°C
and 50°C requires output current derating.
3: External Heatsink Installation
Drive operation between -10°C and 40°C allows 100% continuous current without derating. Operation between 40°C
and 50°C requires output current derating.
Figure A.2
Figure A.2 Ambient Temperature and Installation Method Derating
No. Name Description Range Def.
L8-12
Ambient Temperature
Setting
Adjust the drive overload (oL2) protection level when the drive is installed in an environment
that exceeds its ambient temperature rating.
-10 to 50 40°C
L8-35
Installation Method
Selection
0: IP00 Enclosure
2: IP20/NEMA 1, UL Type 1 Enclosure
3: External Heatsink Installation
0, 2, 3
Determined by
o2-04
100%
90%
80%
70%
4 kHz 6 kHz 8 kHz 10 kHz0
100
85
70
55
0
L8-35=2: IP20/NEMA 1, UL Type 1 Enclosure
L8-35=3: External Heatsink lnstallation
L8-35=0: IP00 Enclosure
30
-10
40 50
Drive Rating
(%)
L8-12
(Ambient temp: °C)
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