Shutter hardware

Shutter hardware

The shutter board controls up to two independent elements: the opening and, if fitted, the flaps (AKA lower shutters). Each element has its own motor/driver and its own pair of limit switches.

Opening

The opening motor can be any type—DC, stepper, 3-phase (via VFD), or relay/contactor—wired and configured exactly like the rotation motor; see the DC motor, Stepper motor, VFD, and relay expansion board sections for wiring details.

Two limit switches (open and close), normally open, are required. There is no home sensor for the opening—the limit switches themselves define the open and close positions—and a rotary encoder is optional, though recommended as an extra safety check (see Encoder).

Flaps (lower shutters)

If your shutter has two elements—a main opening and flaps (AKA lower shutters)—the flaps are always driven by a DC motor or a linear actuator (or 2) through a dedicated connector on the shutter board, separate from the opening's motor connector. The flap driver has no encoder input; instead, two limit switches (open and close) are always required to track its position.

Note that even if the flaps use 2 linear actuators, these can be controlled by the same driver; alternatively 2 drivers can be wired in parallel if the power requirements demand it.