VLT HVAC Drive as AHU Controller-V3
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Transcript of 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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 3
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 4
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.
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 5
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 6
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 7
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.
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 8
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 9
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 10
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%
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 11
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 12
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 13
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 14
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 15
150 m cable length standard
No need of output chokes & input chokes
No need of semiconductor fuses
No auxiliary equipment required
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 16
Real Time Clock
For scheduled start / stop / speed control
Eliminates an external timer
Increased flexibility
Reduces load on BMS
Perfect for retrofit applications
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 17
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 18
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 19
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 20
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
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 21
VLT® HVAC Drive – saves an AHU controller
| Confidential/Property of Danfoss Drives A/S | Thursday, 21 August, 2008 | JSP-INSC | 22
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