Phason Supra-RS, Руководство пользователя

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Chapter 2: Installation
24 Phason
Connecting equipment to the Supra
Follow all instructions when installing the Supra and connecting equipment to it.
Use the electrical knockouts for bringing wires or cables into or out of the Supra
enclosure. Do not make additional holes in the enclosure; this can damage the
watertight seal or control components and void the warranty.
The Supra ’s built -in diagnostic tests are useful for testing your equipment after
installing and configuring it. For more information, read
Performing diagnostic tests
on page 105.
Connecting actuators
You can connect up to two actuators to a Supra. Actuators are used for control elements that are
not OFF or ON. Instead, they vary by a percentage. For example, inlets can be opened various
distances from 0 percent to 100 percent.
Typically, linear actuators are connected directly to the inlets, or by cables and pulleys. Inlets are
generally located in the ceiling or walls. Inlet systems are usually spring loaded to help close the inlet,
or counter weighted to help open the inlets.
Each actuator you connect requires two relays: one for extending the actuator arm (opening the
inlet), and one for retracting the arm (closing the inlet). You can connect the actuator to any of the
available relays, but side-by-side relays are recommended.
Feedback potentiometers
Each actuator you connect must have a feedback potentiometer. The feedback potentiometer, which
you connect to one of the Supra’s two feedback terminals, lets the Supra know how far the
actuator’s arm is extended.
Most linear actuators are available with potentiometer feedback and internal adjustable limit
switches. A 10,000 ohm, 10-turn feedback potentiometer is preferred, but the internal feedback
potentiometer can range between 1000 and 20,000 ohms. Potentiometers outside of this range will
affect the precision to which the Supra can control the actuator.
A system operates more precisely when using the largest amount of stroke that is
feasible with the actuator. The stroke is the distance the actuator arm extends or
retracts.