Part 4 — Assembly

The rules for the person who fits a system together (chapter 9). They bind the installer, not a product. Each protects conforming products from a system put together wrongly: a row over its power budget, two transmitters on one bus line, two sources on one DC rail, two sources on one video sync tree. Each applies where the system has what it names.

Contents

9 Assembling a system

Rules for the person who fits modules, bus boards, supplies, DC rails, and the video sync into a row. They bind the installer, not a product: a product conforms whether or not its owner follows them. Each rule protects a conforming product from a system put together wrongly; all are Core.

9.1 Power

A module shall be added to a row only while, on each rail of each power interface, the sum of the published currents (PWR-001) stays within the published totals of every source and every product with outlets that feeds it, such as the bus board and the supply, and the current through each outlet, such as one bus header, stays within that outlet's limit (PWR-002) (ASM-001).

The informative row budget is a worksheet for the sum.

EIS · A row's current budget on the bus: the example row 'performance' +12 V 0.58 A of modules, 3.42 A left bus board and supply 4 A −12 V 0.375 A of modules, 2.125 A left bus board and supply 2.5 A +5 V 0.00 A of modules, 2.00 A left bus board and supply 2 A Audio I/O: +12 V 0.12 A, −12 V 0.08 A Mixer: +12 V 0.18 A, −12 V 0.12 A VCO: +12 V 0.09 A, −12 V 0.05 A VCF/VCA: +12 V 0.08 A, −12 V 0.06 A Envelope/LFO: +12 V 0.06 A, −12 V 0.04 A MIDI utility (Type A): +12 V 0.05 A, −12 V not published A module goes into a row only while each rail's sum stays within the bus board's totals, its per-header limit, and the supply's rating (ASM-001). The dashed segment is the module with no published −12 V figure, planned at 50 % of its +12 V draw, as EIS recommends.

When a module publishes its +12 V current but not its −12 V current, EIS recommends planning −12 V at 50 % of +12 V. In the eis-reference survey, +12 V usually runs out first.

A module goes in with the power off: the ribbon seated square at both ends with the marked conductor toward −12 V (6.4), the panel screwed to the rails, and any blank panel that was removed put back.

Row wiring an installer adds between a power supply, bus boards, a DC entry, or PWR-DC12 outlets shall meet PWR-006 and PWR-007, with each ring terminal clamped on the product's M4 terminal under a lock washer, and a bond an installer adds shall meet PWR-008 (ASM-008). The terminals, gauges, and recommended parts are in 6.1.

Where a system has more than one power supply, installation shall link the bus boards' 0 V so that every bus board reaches, directly or through other boards' links, a bus board fed by each other supply, each 0 V link at most 2 mΩ terminal to terminal, and each bus board shall keep its own 0 V conductor to the supply that feeds it (ASM-009). The links hold one reference across the rows; the returns stay a star (6.3). The system's one chassis tie is at its power entry (6.3).

9.2 Bus CV and gate

At most one module shall transmit on each CV line and at most one on each gate line, where a line runs across linked bus boards up to a region split (ASM-002). EIS recommends at most ten listeners on a line, the load 6.6 states its transmitter limits into (6.6). With no CV transmitter on a line, EIS recommends leaving the listening jumpers of oscillators off, so that a floating CV line cannot detune them.

9.3 DC power entry

The product rules for the DC entry are in 8.1.

9.4 Video sync

Each video sync tree in a row shall have exactly one source, a COAX-OUT or an external video sync at one COAX-IN, and each COAX-IN shall be fed by one output (ASM-007). The product rules are in 8.2; how to distribute the video sync is in the informative Annex F.