Network cabinet fan controller
Public Unreviewedby matt
Two independently controlled 12 V fans, Ethernet and Wi-Fi, and an RGB speed display in a custom printed puck. Routed development preview, not approved for manufacture.
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Enclosure and wiring review — MTA-156 revision
The PCB is 44.5 × 78.5 × 1.6 mm, with R6.5 outer corners. This is a development outline, not a minimum-size claim.
The 44.5 mm width follows the existing controller and its gap between the two magnet bosses. The old controller was a 44.5 mm square centered 15 mm above the enclosure center. The new PCB keeps the same top edge, extends 34 mm farther down, and is centered 2 mm below the enclosure center. That extension provides copper area for heat spreading. It also uses space the original drawing intentionally reserved for wire bends.
The proposed mount is a new removable printed carrier retained to the existing enclosure floor by removable tape. Four M2 screws attach the PCB to the carrier. Extra supports resist connector insertion. The 10 × 5 mm rounded PCB window clears the original bottom locating tab by 1 mm nominally. Existing enclosure and cabinet source files have not been edited. The carrier and tape retention are concepts requiring a printed trial, especially on the vertical door; they are not verified mechanical retention.
The enclosure is 116 mm outside diameter, 110 mm inside bore. The threaded lid reduces the usable radius to 50.5 mm. The board's maximum nominal radius is 44.65 mm; the 0.3 mm gaps to the magnet bosses are the tighter constraint. PCB top is 7.1 mm above the enclosure back. The TE 640445-2 header pin tips are 13.335 mm above the PCB nominally, leaving 3.565 mm to the conservative 24 mm lid plane. This excludes the mating plug, wire bend, manufacturing tolerances and hand access. The source has two assembly definitions with 24/26 mm cap elevations; the lower 24 mm position was used for the screen.
There are four lower cable-entry slots, two on each side of the rod ear. Each is 7.5 mm wide and approximately 12.41 mm from the floor to its rounded crown. Their source plug envelope is 10.52 ×6.13 mm, with an estimated 15 mm axial length. Those dimensions predate the ARCTIC fan confirmation; actual ARCTIC plug dimensions have not been verified. The source comments also retain an older 14.5 mm slot height; the active formula gives 12.41 mm.
The intended paths are fan 1 through a left slot to J2, fan 2 through a right slot to J3,12 V power through another slot to J1, and the remote DS18B20 lead through the spare slot. This assignment is a proposal. No completed three-dimensional cable model, bend-radius test, strain-relief design or connector insertion/removal check exists. A plug fitting through a slot does not prove it can be plugged into the installed board.
No enclosure change has been implemented. Reusing it is the goal, not a verified outcome. The next mechanical review must include both mated fan plugs, the MTA-156 wire plug, realistic wire bends and the carrier; then adjust PCB outline/connector orientation first if needed. Ethernet remains an option under discussion and is not part of this revision. An RJ45 socket and its cable clearance would require a separate enclosure review.
# Enclosure and wiring review — MTA-156 revision
The PCB is 44.5 × 78.5 × 1.6 mm, with R6.5 outer corners. This is a development outline, not a minimum-size claim.
The 44.5 mm width follows the existing controller and its gap between the two magnet bosses. The old controller was a 44.5 mm square centered 15 mm above the enclosure center. The new PCB keeps the same top edge, extends 34 mm farther down, and is centered 2 mm below the enclosure center. That extension provides copper area for heat spreading. It also uses space the original drawing intentionally reserved for wire bends.
The proposed mount is a new removable printed carrier retained to the existing enclosure floor by removable tape. Four M2 screws attach the PCB to the carrier. Extra supports resist connector insertion. The 10 × 5 mm rounded PCB window clears the original bottom locating tab by 1 mm nominally. Existing enclosure and cabinet source files have not been edited. The carrier and tape retention are concepts requiring a printed trial, especially on the vertical door; they are not verified mechanical retention.
The enclosure is 116 mm outside diameter, 110 mm inside bore. The threaded lid reduces the usable radius to 50.5 mm. The board's maximum nominal radius is 44.65 mm; the 0.3 mm gaps to the magnet bosses are the tighter constraint. PCB top is 7.1 mm above the enclosure back. The TE 640445-2 header pin tips are 13.335 mm above the PCB nominally, leaving 3.565 mm to the conservative 24 mm lid plane. This excludes the mating plug, wire bend, manufacturing tolerances and hand access. The source has two assembly definitions with 24/26 mm cap elevations; the lower 24 mm position was used for the screen.
There are four lower cable-entry slots, two on each side of the rod ear. Each is 7.5 mm wide and approximately 12.41 mm from the floor to its rounded crown. Their source plug envelope is 10.52 ×6.13 mm, with an estimated 15 mm axial length. Those dimensions predate the ARCTIC fan confirmation; actual ARCTIC plug dimensions have not been verified. The source comments also retain an older 14.5 mm slot height; the active formula gives 12.41 mm.
The intended paths are fan 1 through a left slot to J2, fan 2 through a right slot to J3,12 V power through another slot to J1, and the remote DS18B20 lead through the spare slot. This assignment is a proposal. No completed three-dimensional cable model, bend-radius test, strain-relief design or connector insertion/removal check exists. A plug fitting through a slot does not prove it can be plugged into the installed board.
No enclosure change has been implemented. Reusing it is the goal, not a verified outcome. The next mechanical review must include both mated fan plugs, the MTA-156 wire plug, realistic wire bends and the carrier; then adjust PCB outline/connector orientation first if needed. Ethernet remains an option under discussion and is not part of this revision. An RJ45 socket and its cable clearance would require a separate enclosure review.