Nxl Hvac Pid C Ontrol – B Asic Setup - Honeywell NXL Series Applications Manual

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6. NXL HVAC PID Control – Basic setup
This chapter provides basic setup instructions for the user of NXL HVAC inverters, when using PID
Control in HVAC applications.
What you need to know
Motor nameplate data
Nominal current
Nominal speed
Signal/sensor specification
Signal type (V, mA)
Range (0-10, 2-10, 0-20, 4-20)
Sensor span
1 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
•
2 Full view of parameters
P2.1.14 Parameter Conceal
•
3 Control Signal Settings
For Volt sensor signal use Analogue Input 1 (AI1)
•
0 – 10 V Default
2 – 10 V P2.2.6 AI1 signal range Set to 4
For milliamp sensor signal use Analogue Input 2 (AI2)
•
4 – 20 mA
0 – 20 mA
4 PID
PID settings
•
P2.9.1 PID activation
P2.9.2 PID reference
no external reference
external reference
Where is the sensor connected?
•
P2.9.3 Actual value input
PID reference (set-point)
•
Note: Only apply if not using external reference from controller!
P3.5 PID reference value (Set point value in percentage)
% = ((set-point – minimum) / span) x 100
for example: set-point is 3.2 bars, 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
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 & Compact User Manual.
NXL HVAC PID control – Basic setup
Motor
Variable Frequency Drive
Set to 0 (not in use)
(no settings needed)
Default
P2.2.12 AI2 signal range 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)
Pump
or
Fan
V signal to AI1 Pressure
mA signal to AI2 Sensor
Setpoint Signal
V signal to AI1
mA signal to AI2
(no settings needed)
Page 67 (68)
Load
Control System
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