Drive Derating Data; Drive Derating Data; Carrier Frequency Derating; Temperature Derating - YASKAWA T1000V Technical Manual

A.6 Drive Derating Data
A.6 Drive Derating Data
Derating allows the drive to operate in conditions above the rated specifications, such as ambient temperature, altitude,
and default carrier frequency. Derating a drive with a rated output current of 10 A down to 8 A, for example, makes it
possible to run the same drive continuously at hotter temperatures.

◆ Carrier Frequency Derating

As the carrier frequency of the drive is increased above the factory setting the drive capacity should be derated according
to Figure A.1.
Figure A.1

◆ Temperature Derating

As the ambient temperature for the drive is increased above the drive specification the drive should be derated.
Additionally parameter L8-35 Installation Method Selection on page
mounting method as illustrated in
Output Current Derating Due to Ambient Temperature
■
If the ambient temperature is above the drive specification or if drives are side-by-side mounted in a cabinet, the
parameters L8-12 and L8-35 must be set according to the installation conditions. The output current is derated as shown
in Figure A.2.
No. Name
Ambient
L8-12
Temperature Setting
Installation Method
L8-35
Selection
Installation Type
Heatsink-Cooled Drive
NEMA Type 1 Drive
Side-by-Side Mounting
Finless Drive or External Heatsink Installation
<1> To use finless drive or external heatsink installation between –10 to 50°C without current derating,
Set L8-35 to 0
Ensure airflow of 0.5 m/s around the drive
314
Drive Rated
Current
Carrier Frequency Derating
ND ND
HD HD
200 V Class:
80% of HD
400 V Class:
60% of HD
0 0
2 2
Carrier Frequency Selection (C6-02)
Figure A.1 Carrier Frequency Derating
Figure A.2 on page 315.
Adjust the drive overload (oL2) protection level when the drive is
installed in an environment that exceeds its ambient temperature rating.
0: Heatsink-Cooled Drive
1: Side-by-Side Mounting
2: NEMA Type 1 Drive
3: Finless Drive or External Heatsink Installation
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
10 (8) 10 (8)
15 15
314 should be set according to enclosure type and
Description
Temperature Derating
–10 to 50°C = 100%
–10 to 40°C = 100%. Derating from 100% at 40°C to 85% at 50°C.
–10 to 30°C = 100%. Derating from 100% at 30°C to 70% at 50°C.
–10 to 35°C = 100%. Derating from 100% at 35°C to 80% at 50°C.
Range Def.
40 to 60 40 °C
0 to 3 0
<1>