Controllers Tab
Page 45 of 67
eZV-440 Version 2.1 Application Guide
Document Edition 2.5
Controllers Tab
Use the Controllers tab to fine tune the controller’s control feedback algorithm. This section
defines each field
Name of field
Description
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.
Reset Rate
The reset rate is defined as the amount of bias change per minute. It is
expressed as percentage change per minute.
The reset 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.