CHC Equipment Control

Description

Define the main control features of controller outputs.

Purpose

Define the main control features of controller outputs.

Mode

Configuration can be performed with the wizard Off-line or On-line.

Procedure

  1. Click the Equipment Control button on the left pane to open the Equipment Control Configuration page.
  2. Enter information into available fields.
  3. Click Commit to save the settings or Reset to revert to the last saved settings.
  4. Click Next to display the Switching Levels Configuration page or Back to display the Inputs Configuration page.

Fields 

Name Definition
Output Options    Defines the operating characteristics of the two valve actuator outputs.
  • Output 1
  • Output 2

Define operation of output 1 and output 2, as configured in the Outputs page. The settings for both Outputs have the same meaning as described in the following text.

  • Valve Direction

Define the operating direction of the valves for actuator types Floating, PWM, and Thermal.

Direct

To open, the valve is modulated from 0% to 100%.

Reverse

To open, the valve is modulated from 100% to 0%.

  • Min Stage Off Time

Define the minimum off-time for control outputs configured for operation as staged outputs. This setting is particularly useful for heat exchanger operation or compressor units. Each stage of the controlled output stays off for the minimum period of time before the controller turns it on again. The selectable range is 0 to 600 seconds.

  • Valve Runtime

This configuration parameter has three different functions depending on the control output type selected in Control Outputs.

(CONTROL OUTPUT TYPE = FLOATING)

The value is the actuator run-time in the range 20 to 600 seconds.

(CONTROL OUTPUT TYPE = PWM)

The value is the cycle period of the PWM output in the range 20 to 600 seconds.

(CONTROL OUTPUT TYPE = ONE, TWO OR THREE STAGE)

The value is the minimum on-time for each of the stages, for controlling compressor units.
PWM Options Configures the full range of the PWM outputs. For many PWM-controlled devices, an output of 0% or 100% is not allowed since a PWM output shows no switching at these percentages. Therefore, most PWM devices have a minimum duty cycle and a maximum duty cycle between which they operate from zero to full scale. The fields here configure the full range settings. You can swap the Zero and Full range values to achieve reverse operation for a PWM output.

Zero

PWM % duty cycle for fully closed position.

Full

PWM % duty cycle for fully open position.

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