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eZFC-424R4-24 Application Guide
Edition 2.6
Page 53 of 84
Controllers Tab
What is the Controllers Tab?
Use the Controllers tab on the enteliZONE controller configuration page to fine tune the controller's
control feedback algorithm.
This section defines each field on the controller tab.
Controller Type
The control algorithm used by the controller. The algorithms are PI (Proportional-Integral), P
(Proportional), PID (Proportional-Integral Derivative) and I (Integral).
Proportional Band
The temperature range which the input must vary to cause a change in the controller output from 0
to 100%.
Deadband
The controller deadband is a small range in which temperature variation is allowed. When the input
is within the deadband, the controller output is fixed.
Deadbands should be small enough so that the occupant does not notice the temperature
variations within the deadband. However, making deadband ranges too small will make the
actuators adjust frequently and cause unnecessary wear on the equipment.
Integral Rate
The integral rate is defined as the amount of bias change per minute. It is expressed as percentage
change per minute.
The integral rate determines how fast the controller bias is adjusted to make the necessary
correction so that there is no offset between the signal and the setpoint.
Reset Band
The reset band provides a dynamic means to adjust the amount of output bias added to the
controller output.
When the input is outside of the reset band, the effective reset rate is equal to the specified reset
rate. When the input is within the reset band, the effective reset rate is proportionally reduced.
When the input is within the deadband, no further reset action occurs.
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