Seven-channel mechanically switched AC-load study with host-side control, relay coils and separated load wiring. Mains insulation, coil-power allocation, enclosure, thermal behavior and relay/contact ratings require qualification before use.
Current retained annotation candidate: v16, 2026-10-13. Current uppercase revision labels, a reflowed documentation link and a contact-terminal guide improve readable wiring information without changing circuitry, relay mechanism, copper, isolation slots/lands, protective features or mounting. Contact terminals are 1 = NO, 2 = NC, 3 = C; coil-drive LEDs do not prove contact position.
Fresh full-track native checks report zero enabled errors, opens and schematic-parity errors; design-rule warnings changed from 11 to 10, with no category increase. Seven inherited schematic footprint-link warnings remain. Six normal-population views were inspected, all 149 declared model instances resolve, and 17 source-bound exports were verified. Existing dense edge markings still need cleanup. This is an unqualified engineering candidate: fabrication release, physical assembly, current/thermal/load/isolation, host and cable/enclosure qualification remain withheld.
This page documents an unqualified engineering study, not a released or tested product. Saved CAD, renders and automated checks do not establish a safe assembly, compatible cable, firmware support or a usable current rating.
The retained design record states:
Selected v11 repairs duplicated underside labels from visually rejected v10; all ten original-program successors v02–v11 remain preserved. Fresh parent ERC/geometry/opens/parity zero;168 contracted references/438 pins,149 fitted parts,301 selected package hashes and3016 successor hashes reconcile. Actual212-via/330-SMD shape screening is clean. Six board views, four CAM faces, full schematic and underside labels were independently inspected.
Board-specific qualification limits: v11 retained strictnative0/ordinaryassembly0;73procurement gates and coil/host/mains/insulation/fault/thermal/physical signoff remain open.
The exact connector orientation, pin mapping and supply ownership must be taken from the selected revision’s schematic and connection specification. Do not infer wiring from the connector shape.
Power off before connecting or changing jumpers. Verify pin 1, signal direction, supply voltage and ground at both ends of every cable. A mechanically fitting connector is not proof of electrical compatibility. If a host pin mapping or current allocation remains unresolved in the design record, do not connect the board until it is resolved.
See current review. Retain seven optical/discrete coil channels,TPS259474 and isolated converter. Existing seven V1 5.6k10%0603 indicator stock slots applied v03;TPL7407L/DRV8860 redesign not justified,no IC-stock successor. Current selected v11; retained native/stock/physical qualification limits remain explicit.
Use the configuration and firmware contract for the exact selected revision. Do not copy another module’s socket assignments or assume that an unused pin is available. First-article work must verify source selection, reset/unplug behavior, cable orientation and the actual load or sensor interface before normal operation.
The following are requirements for the next design iterations; this page does not claim they are already fitted:
Documentation route: smoothieware.org/extensions/seven-channel-ac-mechanical-relay.
The 2026-10-11 upgrade program has saved additional candidates v12, v13, v14. These studies preserve the historical design described above. Their connector, LED, mechanical and protection changes are revision-specific and remain unqualified.
See the per-board changes, failures and remaining work and mandatory family specification. Use the source hash and native check for the exact candidate being reviewed; do not infer hardware ratings from a rendered population.
The three additional revisions are v12, v13, v14. They are engineering studies; saved CAD and renders do not release the hardware. The latest candidate is described below. Older baseline notes above remain historical.
f30a77a67cb8b3e8872ff94e878e98ea13c5924601ea54f7defa8e176f576d5c.Applicable protection, current-path, thermal, pinout, cable access and physical tests remain open wherever the linked board record has not verified them. A zero native-error count does not close those gates.