Chapter 3: Configuring your PEC Plus Phason
34 2009-06-15
Configuring relays
The PEC Plus has six relays that can be configured for several options.
Off – the relay is always open (off). This is the default.
On – the relay is always closed (on). This can be used as an override.
Actuator – the relay controls a cooling element called an actuator. Actuators require one relay for
opening and one for closing.
Curtain – the relay controls a cooling element called a curtain machine. Curtains require one
relay for opening and one for closing.
Cooling – the relay controls a cooling element and switches on when the temperature rises
above the temperature set point. An example of a cooling element is a single-speed fan.
Heating – the relay controls a heating element and switches on when the temperature falls below
the temperature set point. An example of a heating element is an electric heater.
Duty cycle (cooling) – the relay controls a cooling element and switches on when the
temperature rises above the temperature set point. Instead of remaining on constantly when the
temperature is above the set point, the relay switches on for a duration, then off for a duration
before repeating the process. An example of a duty cycle cooling element is a mister.
Duty cycle (heating) – the relay controls a heating element and switches on when the
temperature falls below the temperature set point. Instead of remaining on constantly when the
temperature is below the set point, the relay switches on for a duration, then off for a duration
before repeating the process.
Configuring relays for actuators
You can connect up to two actuators to a PEC Plus. 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).
Actuator 1 uses relay 1 to open (extend) the actuator and relay 2 to close (retract)
the actuator.
Actuator 2 uses relay 3 to open (extend) the actuator and relay 4 to close (retract)
the actuator.
Use the
Relay configuration worksheet on page 88 when configuring relays.
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