WEBVISION™
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40
CHC Equipment Control
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.
CHC Equipment Control Options
Table 10 describes the configuration options.
Table 10. CHC Equipment Control - Options.
Name
Option and Definition
Output Options
Defines the operating characteristics of the two valve actuator outputs.
Output 1 and 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.
