YASKAWA GA800 GA80U Series

5.3 Derating Depending on Ambient Temperature
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YASKAWA TOEPC71061779E GA800 DRIVE INSTALLATION MANUAL
Make sure that there is 2 mm (0.08 in) minimum of space between drives.
2 : IP20/UL Type 1
Use this setting to install IP20/UL Type 1 drives or IP55/UL Type 12 Heatsink External Mounting drives.
3 : Finless
Use this setting to install a finless drive.