text: <s>[INST] Powerflex 753 Summary: Heat sink Fan When is the heat sink fan supposed to run? Is there a parameter that would make fan run all the time? [/INST] https://rockwellautomation.custhelp.com/app/answers/detail/a_id/66014 This article explains the fan operation. Frames 0-4 The stirring fans sometimes referred to as muffin fans are on anytime the drive is powered up The main fans also known as the heatsink fans will turn on when the drive starts and turn off thirty seconds after the drive-stops. The turn off is independent of drive temperature. Frames 5, 6, 7 The stirring fans sometimes referred to as muffin fans are on anytime the drive is powered up. The main cooling fan(s) also known as heatsink fan(s) turn on when the drive starts and turns off thirty seconds after the drive-stops. The turn off is independent of the drive temperature Frames 8 and above The door mounted fans on the cabinet doors of an IP20 PowerFlex 755 drive frame 8 and greater turn on when the drive is powered, running, and is drawing more than approximately 10% of drive rated current. Document 454153 - PowerFlex 755 door mounted fans explains the operation of these fans in greater detail. On IP54 drives the door mounted fans are removed and a blower unit is installed on the top of the cabinet. This blower performs the same function as the door mounted fans and operates under the same criteria. The main cooling fan(s) also known as bridge fan(s) or heatsink fan(s) turn on when the drive becomes active (started) and turns off thirty seconds after the drive-stops. The turn off is independent of drive temperature. Note: The Fans for frames 2-7 are 24 Volt DC Fans. They can be tested by putting 24 VDC to the fans to see if they spin. Also, check that the connector outputs 24VDC if the drive is started. If not, replace power interface board (frame 6 and 7). If frame 5 and below, replace drive. The heatsink fan(s) for frame 8 and above is a self contained fan and inverter. \\n </s>