I Ntroduction - Honeywell NXL Series Applications Manual

Honeywell
HVAC Application
1. Introduction
The HVAC Application for NXL uses direct frequency reference from the analogue input 1 as a
default. In this way and with the help of start up wizard the basic commissioning of Honeywell NXL
HVAC drive has been made extremely simple. Basic case with analogue input control with 0-10V or
4-20 mA signal (like the case is with most HVAC applications) the programming of this product can
be done in less than 30 seconds.
However for more complicated applications advanced features are available. This application
manual offers the user to do more things than just the standard setup allows like PID controller can
be used e.g. in pump and fan applications, which offers versatile internal measuring and adjusting
functions. This means that external devices are not necessary. When the drive is commissioned, the
only visible parameter group is B2.1 (HVAC parameters). The special parameters can be browsed
and edited after changing the value of par. 2.1.14 (Parameter conceal).
The direct frequency reference can be used for the control without the PID controller and it can be
selected from the analogue inputs, fieldbus, keypad, preset speeds or motor potentiometer.
Special parameters for Pump and Fan Cascade Control (Group P2.10) can be browsed and edited
after changing the value of par 2.9.1 to 2 (Pump and fan control activated).
The PID controller reference can be selected from the analogue inputs, fieldbus, PID keypad
reference 1 or by enabling the PID keypad reference 2 via digital input. The PID controller actual
value can be selected from the analogue inputs, fieldbus or the actual values of the motor. PID
controller can also be used when the frequency converter is controlled via fieldbus or the control
keypad.
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Digital inputs DIN2, DIN3, (DIN4) and digital inputs DIE1, DIE2, DIE3 are freely
programmable.
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Internal and optional digital/relay and analogue outputs are freely programmable.
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Analogue input 1 can be programmed as current input, voltage input or digital input DIN4.
NOTE! If the analogue input 1 has been programmed as DIN4 with parameter 2.2.6 (AI1 Signal
Range), check that the jumper selections (
Additional functions:
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The PID controller can be used from control places I/O, keypad and fieldbus
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Sleep function
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Actual value supervision function: fully programmable; off, warning, fault
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Programmable Start/Stop and Reverse signal logic
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Reference scaling
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2 Preset speeds
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Analogue input range selection, signal scaling, inversion and filtering
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Frequency limit supervision
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Programmable start and stop functions
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DC-brake at start and stop
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Prohibit frequency area
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Programmable U/f curve and U/f optimisation
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Adjustable switching frequency
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Autorestart function after fault
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Protections and supervisions (all fully programmable; off, warning, fault):
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Current input fault
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External fault
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Output phase
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Under voltage
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Earth fault
Introduction
Figure 1- 1
, page 25) are correct.
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Motor thermal, stall and underload protection
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Thermistor
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Fieldbus communication
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Option board
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