Nxl Hvac Pid Control - Honeywell NX Series Pocket Programming Manual

NXL HVAC PID Control

What You Need to Know
Motor nameplate data
− Nominal Current
− Nominal Speed
Setup
3 Run the Start Up Wizard
Note: Running the Start Up Wizard resets all parameters to their default values.
• Hold STOP down for 5 seconds
• Select application type FAN or PUMP and confirm with ENTER
• Select motor nominal speed and confirm with ENTER
• Select motor nominal current and confirm with ENTER
4 Full view of parameters
• P2.1.14
5 Control Signal Settings
• For Volt sensor signal use Analogue Input 1 (AI1)
0 – 10 V
2 – 10 V
• For milliamp sensor signal use Analogue Input 2 (AI2)
4 – 20 mA
0 – 20 mA
6 PID
• PID settings
P2.9.1
P2.9.2
• Where is the sensor connected?
P2.9.3
• PID reference (set-point)
Note: Only apply if not using external reference from controller!
P3.5
Note: Only one function per input. If there is a need to change mA input to V input or
vice versa, please see instructions in the NXL HVAC User's Manual. Available for
download at http://inettrack.europe.honeywell.com/support.
10
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Signal/sensor specification
− Signal type
(volts, milliamps)
− Range
(0-10, 2-10, 0-20, 4-20)
− Sensor span
Parameter Conceal Set to 0 (not in use)
Default
P2.2.6 AI1 signal range
Default
P2.2.12 AI2 signal range
PID activation
PID reference
no external reference
external reference
Actual value input
PID reference value (Set point value in percentage)
% = ((set-point – minimum) / span) x 100
For example: set-point is 3.2 bar, the sensor span is 0 – 5 bar.
3.2 divided by 5 is 0.64; the value to set in P3.5 is thus 64
(no settings needed)
Set to 4
(no settings needed)
Set to 1
Set to 1 (activate)
Set to 2 (value from keypad)
Set to 0 (AI1) or 1 (AI2)
Set to 0 (AI1) or 1 (AI2)