HVAC systems are designed to provide a comfortable
environment regardless of outside conditions. To do this, each
system typically must maintain a minimum pressure, flow, or
temperature. This desired variable, or setpoint, needs to be
maintained as conditions change. By maintaining the optimal
setpoint, control is maximized as well as energy savings.
A PID (Proportional, Integral and Differential) control device
can be used to balance out the difference between the sensor
signal and the desired (programmed) value by instructing the
attached drive to speed up or slow down accordingly.
The VLT 6000 HVAC has a very sophisticated PID controller
integrated in to its software. The PID has been uniquely
integrated with HVAC dedicated features and can be programmed in
a user-friendly way. It is this which makes it uniquely distinct
from other drives and making use of the built-in PID controller
with dedicated HVAC features will, in many cases, make it
possible to eliminate external controllers or outstations.