Laars MagnaTherm HTD Series, Инструкция по установке и эксплуатации

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Page 73
HTD
8.D.4.a.1 Cascade CH Lead Settings
To navigate to the Cascade CH Lead Configuration Screen, touch the Cascade Icon on the Configuration Screen,
then touch the Cascade CH Icon on the Cascade Configuration Screen, and then touch the Lead Settings Icon on the
lead unit.
The Cascade CH Lead Configuration Screen allows adjustment of the following parameters:
• Set Point – This is the temperature the cascade heat demand is trying to satisfy.
• Proportional Gain – This value is the corrective action that is proportional to the error (Set Point – Control
Temperature).
• Integral Time – This value is applied to the sum of the error over a period of time.
• Derivative Time – This value is applied to the rate of change of the error.
• Off Hysteresis – The temperature above the set point (Set Point + Off Hysteresis) at which the controller will stop
calculating the PID output and set the PID output to 0 to turn off all stages.
• On Hysteresis – The temperature below the set point (Set Point – On Hysteresis) at which the control begins
calculating the PID output to turn on stages.
• Max Lag Temp – The maximum outlet temperature a lag unit is allowed to supply the system.
• Base / Drop Load – This button will get you to the Base / Drop Load screen which allows you to manually enter
the base firing percentage of the next cascading boiler as well as the firing point at which this boiler will drop the
remaining load to the next cascaded boiler.
See Section 8.D.4.c.1.A on page 74
C O N F I G U R AT I O N