Chemtrac HydroAct 4, User Manual

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64 Chapter 4. Outputs
In all cases the polarity and output mode of the relay will need to be configured. Pulse width
modulation outputs a repeated pulse with a fixed width. The control signal is output by increasing the
proportion of time the relay is active in any pulse as the value increases. Pulse frequency modulation
outputs pulses of a fixed activated width, but increases the frequency of the pulses in respect of the
control output value.
Polarity Options are “Normally Open” and “Normally Closed”.
Mode Options are “Pulse Width Modulation” or “Pulse Frequency Modulation”.
When "Pulse Width Modulation" is selected further options are:
Pulse Width
Define the maximum pulse width in MM:SS. The relay will energize for a proportion of
this time based on the control output value.
Deadband Defines the minimum pulse width that would be output. This can be used to avoid relay
chatter due to a small control output value.
When "Pulse Frequency Modulation" is selected further options are:
Pulse Width Define the length of pulses output. Options are between 0..5000 ms.
Maximum Frequency As the control output value increases, the frequency of pulses outputs increase.
This setting defines the maximum frequency of pulse outputs.
4.2.3.4 Options for Data Output Mode
4.2.3.4.1 Map Output
This configuration screen is accessed by pressing “Next” from the Output Setup screen or navigating
via the Options Menu.
Options
→
Setup
→
Map Output