GE Ecomagination AF-600 FP Programming Manual page 160

Parameter Description
NOTICE
Set any unused feedback to [0] No function in
•
Parameter CL-00 Feedback 1 Source.
•
Parameter CL-03 Feedback 2 Source.
•
Parameter CL-06 Feedback 3 Source.
The PID controller uses the feedback resulting from the
function selected in parameter CL-20 Feedback Function to
control the output frequency of the frequency converter.
This feedback can also:
•
Be shown on the frequency converter's display.
•
Be used to control a frequency converter's analog
output.
•
Be transmitted over various serial communication
protocols.
The frequency converter can be configured to handle
multi-zone applications. 2 different multi-zone applications
are supported:
Illustration 3.57 Example, Multi-zone, Single Setpoint
Example 2 – Multi-zone, multi-setpoint
The previous example illustrates the use of multi-zone,
multi-setpoint control. If the zones require different
pressures for each VAV box, each setpoint may be specified
in
•
Parameter CL-21 Setpoint 1.
•
Parameter CL-22 Setpoint 2.
•
Parameter CL-23 Setpoint 3.
By selecting [5] Multi-setpoint minimum in
parameter CL-20 Feedback Function, the PID controller
increases the fan speed if any one of the feedbacks is
DET-620D
AF-600 FP™ Programming Guide
•
•
Examples 1 and 2 illustrate the difference between the 2
applications:
Example 1 – Multi-zone, single setpoint
In an office building, a VAV (variable air volume) AF-600 FP
system must ensure a minimum pressure at selected VAV
boxes. Due to the varying pressure losses in each duct, the
pressure at each VAV box cannot be assumed to be the
same. The minimum pressure required is the same for all
VAV boxes. This control method can be set up by setting
parameter CL-20 Feedback Function to [3] Minimum, and
entering the desired pressure in parameter CL-21 Setpoint 1.
If any feedback is below the setpoint, the PID controller
increases the fan speed. If all feedbacks are above the
setpoint, the PID controller decreases the fan speed.
below its setpoint. If all feedbacks are above their
individual setpoints, the PID controller decreases the fan
speed.
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Multi-zone, single setpoint
Multi-zone, multi-setpoint
3 3
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