The optional External Heatsink Installation Kit will let you install the drive with the cooling fins, which are the main heat-dissipating component of the drive, external to the enclosure panel. Table 1 shows the model numbers for the drive and the attachment. Contact Yaskawa or your nearest sales representative to make an order. Table 1. External Heatsink Installation Kit (Optional) Drive Model Heatsink External Mounting Kit Model (No.) 2004 - 2042 4002 - 4023 900-193-209-001 (100-203-229) 2056 4031, 4038 900-193-209-002 (100-203-230) 2070, 2082 4044, 4060 900-193-209-003 (100-203-231) 2110 - 2415 4075 - 4H12 1 1 When you install models 4075 to 4H12 with external heatsink installation, use the mounting brackets supplied with the drive. Optional attachments are not necessary. Refer to “External Heatsink Installation Kit Instruction Manual (TOxP C720600 03)” for more information about how to do an external heatsink installation.