NXL Series HVAC Variable Frequency Drive

Honeywell NXL is a compact frequency converter with the output ranging from 250 W to 30 kW. The Motor and Application Control Block is based on microprocessor software. The microprocessor controls the motor basing on the information it receives through measurements, parameter settings, control I/O and control keypad. The IGBT Inverter Bridge produces a symmetrical, 3-phase PWM modulated AC-voltage to the motor.

The control keypad constitutes a link between the user and the frequency converter. The control keypad is used for parameter setting, reading status data and giving control commands. Instead of the control keypad, also a PC can be used to control the frequency converter if connected through a cable and a serial interface adapter (optional equipment). Honeywell NXL HVAC series already includes I/O board NXLOPTAI as standard. All other sizes but MF2 have an internal brake chopper. For closer information, contact Honeywell see back cover). The input EMC filters are available as options externally for MF2 and MF3. In other sizes the filters are internal and included as standard.

Variable frequency drives provide step-less speed control for all basic HVAC applications such as Pumps, Fans, Compressors. Variable Frequency Drives (VFD) accept a control input and then output tailored PWM control signal to operate (motors, fans, pumps, etc.) with maximum efficiency. The VFD can be field-programmed without any extra devices or computer connections.

• Easy to set-up features: Fully configured drive ready to accept 0-10 V analogue speed signal from controller in 30 seconds. Quick installation guide Includes 1-page instructions for installation & set-up. “Keypad – Remote” Operation consists Single button operation to change the control to manual (keypad) and back. It is a Useful function when commissioning and testing HVAC applications. There is Consistency in all VFDs, all Honeywell VFDs behave in similar way
• Compact and robust design: Enclosure Class, Modular design, Built in input AC choke and RFI filter
• Uninterruptible operation and energy saving functions: Over temperature ride-through, Power ride-through, Trip free output switching, Auto restart function, Energy Saving Function “Flux Optimization”
• VFD and motor control features: Best in performance flying start, Automatic torque boost function, Motor auto identification, High Switching Frequency, Prohibit frequency, Temperature-controlled fans
• HVAC control features: Inbuilt PID controllers, Sleep Mode, Fire override mode, Pump and Fan Cascade Controller

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