AAON Auto-Zone 2 GPC-XP - Relay Output #8; Analog Output #1

Conguration
Conguring The Controller
Analog Output #1
In this example Analog Output #1 is congured for the “Tower Fan
VFD” output. In Figure 33 Item #1 it indicates it has a Control Type of
“Direct Acting Floating Point”.
Item #2 indicates the Control Source for this relay will be the Tower Re-
turn Water Temperature (“TW Return”) on AIN2. Item #3 indicates that
the “Max Setpoint” will be 82.0° F and the “Deadband” will be 3.0° F.
Item #4 Shows the Enabling Relay to be the “TW Spray Pump” output
congured on (Relay #3). This means that in addition to the “Tower
Return” temperature being above setpoint the “TW Spray Pump” output
must also be activated for the “TW Fan VFD” to modulate.
Item #5 indicates it also has Output Limits of :
Max Voltage = 10.0 VDC
Min Voltage = 0.0 VDC.
Item #6 shows that its calculation settings are:
Calculation Interval (Controls Speed) = 3.0 Sec
Proportional Control Window = 1.0° F
With this conguration sequence the “TW Fan VFD” will modulate its
speed towards 100% (10.0 VDC) when the “TW Return” temperature”
(AIN2) is 3.0° F above the 82.0° F setpoint (85.0° F) and the “TW Spray
Pump” (Relay #3) output is active.
When the “TW Return” temperature” (AIN2) is between 85.0° F and
79.0° F and the “TW Spray Pump” (Relay #3) output is active, the TW
Fan VFD” will maintain its speed at a constant level.
The “Tower Fan VFD” will modulate its speed towards 0% (0.0 VDC)
when the “TW Return” temperature” (AIN2) is 3.0° F below the 82.0° F
setpoint (79.0° F) and the “TW Spray Pump” (Relay #3) output is active.
If the “Tower Spray Pump” (Relay #3) is deactivated the “Tower Fan
VFD” (AO #1) will move to 0% (0 VDC).
Relay Output #8
In this example Relay Output #8 is congured for the “System Active”
relay. In Figure 32 Item #1 it indicates it has a Main Control Method
of “Follow Inactive Binary Input”.
Note: The Emergency Shutdown switch or contact closure is
usually a normally closed contact. This means it will open
to activate to cause a Emergency Shutdown condition.
That is why it is selected to “Follow Inactive Binary
Input” instead of “Follow Active Binary Input”.
Item #2 indicates the “Binary Input to Follow” for this relay will be the
“Emerg Shut Down” binary input (BIN8).
No other settings are required for this relay output.
With this conguration sequence the “System Active” (Relay #8) will
deactivate turning off the “System Active” relay (Relay #8) when the
“Emerg Shut Down” binary input (BIN8) is activated (opened).
33
WSHP Loop Controller GPC-XP Guide