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724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 55
Chapter 4: E2 Controller
Figure 4-18. Control inputs and outputs.
The E2 controller continually analyzes the demand for cooling, humidifying, and dehumidifying against the control setpoints and
determines the appropriate response (control output signals) to operate the A/C system. The controller is equipped with analog
input positions for monitoring temperature and humidity sensor(s). The controller monitors the actual cold aisle supply air
conditions for three fan zones (upper, middle, and lower) as measured by temperature sensors mounted locally to each zone
inside the Cold Row cabinet. The controller also monitors a temperature/humidity (T/H) sensor that is mounted in the return (hot
aisle) side of the cabinet.
A remote, mounted supply air T/H sensor may also be provided as an option. The controller may be configured by the factory to
manage system operation based on the remote T/H sensor inputs that are to be field installed in the supply (cold aisle) space.
4.4.1 Control Signals
Control output signals and alarm recognition takes place by means of the controller analyzing signal inputs from the sensor(s) and
developing the appropriate digital or proportional response.
4.4.1.1 On/Off Digital Control
Based on control inputs, the controller provides an on/off output signal to activate certain modes of operation for the air
conditioner (i.e. humidifier, fans, or annunciate an operating condition status, that is, alarm condition).