vlt hvac drive as ahu controller-v3

VLT® HVAC Driveas a simple AHU Controller

| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 2

Initial cost benefits

No need of starters

No need of PF correction capacitors

No need of motor protection relays, MPCBs etc.

No need of auto / manual selectors

No need of metering equipment (Hz / Volts / amperes etc.)

Lower cable and fuse rating – to match the FLC only – not for starting current


Display of controlled parameters

Display on local control panel can be used to measure and display

– temperature, in oC– pressure, in PSI or kg/cm2

– IAQ, in ppm– Energy, in kWh – Current, in A– Voltage, in V– etc.

Can be used to display all controlled parameters like Supply air temperature, Return air temperature, IAQ, RH if appropriate sensors are connected


Drive serves as the AHU panel

Selection of IP 55 enclosure with disconnect available to be used as AHU panel

IP 55 enclosure eliminates need of an electrical panel to house the VFD

Input disconnect switch on VFD eliminates an additional accessory - the switch / isolator required as per Indian Electricity Rules

No need of additional controls and protection for the motor like thermal over load relays,MPCB etc.


4 x PID loops available

Used to control external HVAC devices like Chilled water valve, humidifier, dampers etc.Stand alone control by drive Drive can be used as an AHU controller in simple applications

Eliminates the need of additional PID controllersEliminates DDC in simple control applications

Drive serves as controller for valves and dampers


Built in HVAC application settings

Built in application settings for fan, pump and compressor

Do not need programming after manufacturing

Settings based on Danfoss’ more than 40 years experience

Programming do not depend on engineer’s independent knowledge

Increases system efficiency and saves energy


Multi Zone control

Controls a very large air-conditioned area on average of signals (temp / pressure)

Useful in VAV / CAV AHUs and Secondary pumps

Capable of connecting upto 3 nos signal inputs w/o any additional controller

Can work on average / maximum / minimum values or set point or multizone maximum / minimum.


In built IEC 61800-3, Class C1 EMC filters

Will eliminate interference with other electronic equipment

A must for critical facilities like Data Centers, IT parks, Hospitals, Airports etc.

VLT® HVAC Drive offers built-in EMC filters as per following specifications as per site requirement:

– Class C1, 50 m– Class C1, 10 m– Class C2, 50 m– Class C3, 150 m– Class C3, 5m /25 m


Inbuilt Harmonic Filters

Reduces harmonic currents generated by VFDs to acceptable limits

Example– mains current – 38.57 A – Drive without harmonic filter,

mains current = 55.8 A– Drive with inbuilt harmonic filter,

mains current = 39. 5 A

VLT® HVAC Drive comes inbuilt with DC harmonic filters

No need to add additional AC input chokes


Automatic Energy Optimisation (AEO)

95% of the HVAC motors are under loaded

Differential torque produced by the motor is wasted as heat.

AEO function matches torque production and demand

Saves energy even at full speed running

Betters equipment efficiency

Increases energy savings

Typical savings are between 5-15%


Automatically adapts to installed motor

Motors on the fan / pump may be new, old or rewound

Based on the above, motor characteristics can change

Drive automatically registers installed motor’s characteristics

Increases drive + motor system efficiency

Reduces energy consumption


Monitors of energy consumption equipment

Tracks energy consumed by the equipment

– hourly, every day– daily, every week– daily, every month

Helps user to track energy consumption of equipment / building

Assist in energy improvement measures


Preventive maintenance of equipment

Helps planned system maintenance

Makes the HVAC system more reliable

Gives reminders for maintenance activities

If connected to BMS, BMS also able to receive reminders.

Improves system efficiency and saves energy


Save cost due to correct magnetisingSave energySave space

No need for selecting a higher rating motor

No need to select an inverter grade motor

Motor friendly


150 m cable length standard

No need of output chokes & input chokes

No need of semiconductor fuses

No auxiliary equipment required


Real Time Clock

For scheduled start / stop / speed control

Eliminates an external timer

Increased flexibility

Reduces load on BMS

Perfect for retrofit applications


Automatically detect a broken beltIndicates a loose beltIndicates warning on the displayExports warning to BMS

Eliminates the need of an air flow switchEliminates the associated wiringReduces 1 digital input to the BMS

Broken belt detection for AHUs


Can directly accept a fire signalStops the AHU in case of fireIgnores all normal warnings & alarmsComplies with international safety laws

Reduces 1 digital output from the BMSNo need to program BMS to stop the AHU

Fire mode operation


RS 485 Protocol

BAS/DDC

Enhanced monitoring and diagnostic capabilitykWH & load profile monitoringFull read / write capability

Eliminates external kWH meterEliminates multi point DDC controllerEliminates additional gatewaysSavings in BMS I/O points

Available with the following BMS protocols:

– Modbus RTU– Metasys N2 (Johnson Control)– Bacnet MS/TP

Seamless integration into BMS


PID-1 controlling speed of fan / pumpPID-2 controlling CHW valvePID-3 controlling hot water valvePID-4 controlling fresh air damper

5 Analog inputs – (5 x 0-10V or 2 x 4-20 mA + 3 x Pt

1000 / Ni 1000)4 Analog outputs

– (1 x 4-20 mA + 3 x 0-10V)

Pt 1000 / Ni 1000 sensor connections

Fire mode control – start / stop / high speedInput disconnect switch

Using VLT® HVAC Drive as a simple AHU controller


VLT® HVAC Drive – saves an AHU controller


2+

100

Just some of the Applied

(System) Cost Savings

using Danfoss VLT

HVAC Drives

IP 55 enclosure

kWh meter

Broken belt

detect-ion

Base Product

BMS connect-

ivity

Disconnect switch

Other features

Real costof

DanfossHVACDrive

Real cost of Danfoss VLT®

HVAC Drive

vlt hvac drive as ahu controller-v3

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