How it Works
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AMD-xx-TD
User Manual
35 pgs1.26 Mb0

Greenheck AMD-xx-TD User Manual

Installation, Operation and Maintenance Manual
for
Thermal Air Flow Measurement Transmitter
Version 1.4X & 1.5X
®
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TABLE OF CONTENTS
SECTION 1 – GENERAL INFORMATION
SECTION 2 – PERFORMANCE SPECIFICATIONS
SECTION 3 – FEATURES
SECTION 4 – INSTALLATION
SECTION 5 – OPERATION
2
TABLE OF CONTENTS
SECTION 6 – SUPERVISOR MENU
SECTION 7 – MAINTENANCE
Technical Support: E-mail: dampers@greenheck.com or Phone: 1-800-717-6540
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1 – GENERAL INFORMATION
1.1 – DESCRIPTION
The Vari-Green® Thermal Air Flow Transmitter is used in conjunction with Vari-Green Probe(s). One Transmitter can receive up to 32 individual flow sensors measuring a single ducted airflow or fan.
The Transmitter’s microprocessor averages flow and temperature signals from all sensors and outputs an analog signal and local display of these averages. The Transmitter serves as the interface for all configuration and diagnostic functions.
1.2 – THEORY OF OPERATION
The Vari-Green utilizes thermal dispersion technology to measure airflow. As air moves across the surface of an elevated temperature sensor, heat is transferred from the sensor to the airflow in a mathematically defined relationship between heat transfer rate and airflow velocity.
Each Vari-Green sensing node utilizes a pair of precision matched thermistors. One functions as a reference sensor measuring the ambient air temperature at the sensing node location, and the other thermistor is heated to a preset temperature differential (∆T) above the ambient air temperature. Airflow velocity is determined using the measured ambient air temperature, the known heat transfer characteristics of the heated thermistor, and the power consumed to maintain the ∆T between the two thermistors.
Using a combination of Computational Fluid Dynamics (CFD) modeling and extensive full-scale wind tunnel verification, the aerodynamically optimized cross section of the sensing node aperture prevents error inducing turbulence typical of sharp edged sensing tubes.
Using a combination of Computational Fluid Dynamics (CFD) modeling and extensive full-scale wind tunnel verification, the aerodynamically optimized cross section of the sensing node aperture prevents error inducing turbulence typical of sharp edged sensing tubes.
The aperture’s injection molded shape has been engineered to minimize the angular flow effects naturally present in any duct. The flared aperture captures a representative sample of the ducted airflow, while the contoured leading edges prevent the creation of vortices. The center cross section of the aperture functions in the same manner as a venturi. It stabilizes and flattens the velocity profile at the point of measurement ensuring the airflow maintains full contact with the sensing thermistors. The flow conditioning characteristic of the aperture compensates for turbulent airflow with pitch and/or yaw angles up to ±30 degrees and produces an accuracy of ±2% of reading for each Vari-Green sensor.
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2 – PERFORMANCE SPECIFICATIONS
2.1 – ACCURACY
Sensor Accuracy.
Velocity: ±2% of Reading Temperature: ±0.1ºF
Overall System Accuracy.
Flow: ±2-3% of Actual Flow Temperature: ±0.1ºF of Air Temperature
2.2 – RANGE
Velocity Calibration Range.
Low Range (0 to 5,000 FPM) High Range (0 to 10,000 FPM) Custom Range (consult Factory)
2.3 – PROBE ASSEMBLY
Mounting.
4 in. x 4 in. aluminum plate with four 0.25 in. holes for
fasteners and neoprene gasket.
Length.
8 in. up to 120 in.
Sensors Per Probe.
Maximum of 16
Connection.
Probe to Probe via RJ-45 cable for signal and power. Probe to Transmitter via shielded cable with RJ-45
connection. 10 foot length standard with optional 50 foot and 100 foot lengths.
Temperature Limits.
–20ºF to 180ºF Storage –20ºF to 140ºF Operating
Humidity Limits.
0 to 95% RH, non-condensing.
2.4 – TRANSMITTER
Display.
3 line, backlit graphical display. Flow on Line 1 is
double height and width for improved visibility. Lines 2 and 3 are standard size and are user selectable.
Output.
Dual analog outputs (0-5VDC, 0-10VDC, 4-20mA)
user selectable and configurable.
Configuration.
Via cover mounted membrane keypad
Filter.
Analog outputs filtered via user selectable digital low
pass filter.
Temperature Limits.
–20ºF to 180ºF Storage –20ºF to 140ºF Operating
Humidity Limits.
0 to 95% RH, non-condensing
2.5 – POWER
Power Supply.
24VAC or 24VDC.
Power Consumption.
16 to 90VA dependent on number of sensor nodes (1 to
32 maximum)
Circuit Protection.
Power input is isolated, fused, and reverse polarity
protected. Earth Ground must be connected to the terminal labeled "G".
3 – FEATURES
3.1 – OPERATOR MENU
The microprocessor program contains a Operator menu system for selecting parameters.
Four pushbuttons UP, DN, ENT, and ESC allow the operator access to the menu for setting configuration modes and values. Refer to the Configuration Programming (Section 5.6) instructions for operation details.
Also contained in the Operator menu is an output calibration feature. The calibration method is completely digital and contains no analog potentiometer adjustments which are susceptible to drift. Non-volatile memory is used for storing all setup parameters and calibration values, and will remain unchanged after set, even when power to the unit is off.
3.2 – DATA DISPLAY
The Vari-Green Thermal Air Flow Transmitter utilizes a
high visibility backlit graphical LCD. 3/4" x 2-1/2" display with three lines of process data, selectable for U.S. or S.I. units. Also used for configuration interface.
3.3 – LARGE OPERATION RANGE
The Vari-Green Thermal Air Flow System can maintain accurate and linear output of flows from 0 to 5,000 FPM (Low Range) and 0 to 10,000 FPM (High Range). Consult factory for custom range.
3.4 – ENCLOSURE
The Vari-Green Thermal Air Flow Transmitter is housed in an aluminum NEMA 1 enclosure with hinged front cover for access to power and signal terminals for field connection.
3.5 – MULTIPLE OPERATING POWER SELECTIONS
The Vari-Green Thermal Air Flow Transmitter can be powered by either 24VAC or 24VDC.
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4 – INSTALLATION
4.1 – RECEIVING AND INSPECTION
• Carefully remove the Vari-Green Probe(s) or Station, and Transmitter from the shipping container and inspect for any damage. If any damage has occurred in transit, contact freight carrier.
• Review the Factory Set-Up Information Sheet provided separately and verify the W.O. # and Serial # match those on the Vari-Green. Verify that the configuration recorded on the Factory Set-Up Information Sheet is correct for your application. If not, contact the Greenheck dampers at 1-800-717-6540 for further guidance.
Note: The Vari-Green has been configured to customer
provided parameters (see "Factory Setup Information Sheet" provided separately), and requires no field calibration/verification prior to installation.
4.2 – LOCATION
• The standard version of the Vari-Green Transmitter is a NEMA 1 enclosure suitable for most clean indoor locations. If additional protection is required, mount the Transmitter in an enclosure with adequate NEMA rating.
• The ambient temperature of the selected mounting location must be between -20ºF to 140ºF. Consideration should be given to units exposed to direct sunlight.
• The selected mounting location should be rigid and free of vibration.
4.3 – MOUNTING
Probes. See separate Installation Instructions for the
installation/mounting of Vari-Green Probes and Stations. Transmitter. This section may be skipped if the
Transmitter was ordered factory mounted to the station. – Tools Required: electric drill; #25 (0.1495”) bit;
screwdriver or nutdriver; and four #8-32 self-tapping machine screws.
– The Vari-Green can be mounted in any position
provided it is secured using all four mounting holes.
– Reasonable consideration should be given to
clearances for electrical connections.
– Once a suitable location is found, use the unit as a
template to mark the centers of the four mounting holes.
– Drill four pilot holes at the marked locations. With the
unit in position, install the four #8-32 screws.
®
Thermal Air Flow Transmitter
®
OFF ON
Figure 4.1
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4.4 – PROCESS CONNECTIONS
See separate Installation Instructions provided with the Vari-Green Probes or Station for information on connecting cables from the Probes or Station to the Transmitter.
If the Vari-Green have been purchased with a factory mounted transmitter, all connector cabling has already been installed.
4.5 – POWER/SIGNAL CONNECTIONS
Power wiring is done at terminal strip P8, and signal wiring is done at terminal strip P7. Both P7 and P8 are located in the lower portion of the transmitter and are accessible by opening the front cover. See Figure 4.2 for location of P7 and P8. Two conduit openings are provided in the bottom of the transmitter for the power and signal wiring.
Figure 4.2
WIRING. It is recommended that power wiring be 14 awg to 18 awg, and signal wiring should be 14 awg to 22 awg. 14 awg is the maximum wire gauge that the terminals can accommodate. No more than two wires should be connected to any one terminal. To aid in the wiring of both power and signal wires, P7 and P8 are removable by pulling the terminal strip straight up and off the circuit board. Once wiring has been completed, replace the terminal strip by aligning with receptacle and pressing firmly.
POWER 24 VAC/DC (Terminals L, N and G, P8). Power required by the Vari-Green must be connected to the two terminals labeled L(+) and N(–). Earth ground must be connected to the terminal labeled G. Power Supply must be 20-28VAC or 20-40VDC.
OUTPUT #1 (Terminals 1(+) and 2(-), P7). This output represents the measured airflow and is sourced (powered) by the Vari-Green. Output can be configured for 0-5VDC, 0-10VDC, or 4-20mADC. Review Factory Set-Up Information Sheet for your configuration.
If output is to be 0-5VDC: Position both jumpers on
J3. See Figure 4.2.
If output is to be 0-10VDC: Position both jumpers on
J2. See Figure 4.2.
If output is to be 4-20mADC: Position both jumpers on
J4. See Figure 4.2.
In addition to positioning the jumpers for the desired output type, the corresponding output type must be selected in the Operator Menu (see Section 5.12).
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4.5 – POWER/SIGNAL CONNECTIONS (con’t)
OUTPUT #2 (Terminals 3(+) and 4(-), P7).
This output can represent the measured flow (0 - Design Full Range) or temperature (0 to 140ºF / -18 to 60ºC) and is sourced (powered) by the Vari-Green. Output can be configured for 0-5VDC, 0-10VDC, or 4-20mADC. Review Factory Set-Up Information Sheet for your configuration.
If output is to be 0-5VDC: Position both jumpers on
J6. See Figure 4.2.
If output is to be 0-10VDC: Position both jumpers on
J5. See Figure 4.2.
If output is to be 4-20mADC: Position both jumpers on
J7. See Figure 4.2.
In addition to positioning the jumpers for the desired output type, the corresponding output type must be selected in the Operator Menu (see Section 5.12).
SNVT SNVT Index Measurement Units Type Category Type Size
SNVT_flow_f 53 Flow Volume Liters/Sec Floating Point 4 bytes
SNVT_temp_p 105 Temperature °C x 100 Signed Long 2 bytes
For BACnet, connections are as follows: Terminal 5 – Net A or Net + Terminal 6 – Net B or Net ­ Terminal 7 – Network Ground For BACnet objects, see Appendix A. Set the S1 Termination switches on the BACnet module as follows:
Network Connection (Terminals 5, 6 & 7, P7). This serial output is available with optional LonWorks or BACnet (Version 1.5X only) communication.
For LonWorks, connections are as follows: Terminal 5 – LonWorks B Terminal 6 – LonWorks A Terminal 7 – Ground Two output variables are provided, flow volume and
temperature.
S1 Switch Position
Termination Type 1 2 3
No Termination OFF OFF OFF
End of Line ON OFF OFF
Fail-safe Bias ON ON ON
Note: The Fail-safe Bias termination includes End of Line termination.
4.6 – DISPLAY CONTRAST ADJUSTMENT
To compensate for different ambient lighting conditions and viewing angles, the Vari-Green display's contrast can be adjusted for optimum visibility. Contrast is adjusted using potentiometer R13. Turn R13 clockwise to increase contrast (darken characters relative to background) or counterclockwise to decrease contrast.
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5 – OPERATION
5.1 – INTRODUCTION
The Vari-Green has been configured at the factory to customer specified parameters. Review this information and verify that the Vari-Green set-up is correct for your application. If any problems or discrepancies are detected, contact Greenheck Dampers at 1-800-717­6540 prior to proceeding.
5.2 – START-UP
1. After Installation has been verified in accordance with Section 4, turn power switch located at the lower front side to the ON position (see Figure 4.1).
2. Display will briefly indicate:
Followed by:
The number of active sensors will be represented by
Vari-Green
- - - - - - - - - - - - - - - - - - ­Thanks for Choosing
Greenheck
the bar graph and listed below. There are 8 active sensors in this example.
1 8 16 24 32
Sensors Found: 8 Total Sensors: 8
After 5 seconds, display will indicate:
The number of enabled sensors will be represented
by the bar graph and listed below. There are 8 active sensors in this example.
1 8 16 24 32
After 20 seconds, the display will return to Normal display mode, and the dot in the upper right of the display indicating CPU Activated will blink rapidly (4 times per second). This is Normal operation mode and no further user interface is required. If, however, user would like to verify configuration or change user selectable parameters, continue to Section 5.4 entitled “CONFIGURATION”.
0 ACFM VELO 0 AFPM
TEMP 68.0°F
Normal display mode
* Dot flashes 4 times a second, indicating that
CPU is active. If ALERT flashes instead of Dot, see section for Diagnostics.
*
5.3 - NORMAL OPERATION
Under Normal operation, the Vari-Green transmitter will continuously display flow and velocity, or temperature.
5.4 - CONFIGURATION
The Vari-Green onboard microprocessor controls Configuration: Operating parameter selection; input/ output activation and scaling, and display scaling.
The customer can verify configuration and change certain parameters (within defined ranges) by entering the Vari-Green Configuration mode. This is accomplished using the four membrane pushbuttons located on the Vari-Green cover. See Figure 4.1 for location of pushbuttons.
Enabled Sensors: 8 Total Sensors: 8
After 5 seconds, display will indicate: with the progressing from left to right.
Vari-Green
- - - - - - - - - - - - - - - - - - - ­Sensor Warming Up
®
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5.5 – PUSHBUTTON DEFINITION
The four pushbuttons used to interface with the Vari-Green are as follows: UP DN ENT ESC In addition to use during Configuration programming, pushbuttons can be used for certain functions when in the
Normal operation mode. The following list describes the pushbutton function when in the Normal operation mode and in the User Setup (programming).
When in Normal Operation Mode. ENT then ESC then UP then ENT Activates the Operator menu. ENT then ESC then DN then ENT Activates the Supervisor menu. ENT Activates Password selection menu. ENT then UP then DN then ENT Displays ID, ESID, and WO#. Press UP and software version and maximum
velocity will be displayed. Press ESC and the display will go back to the
Normal operation mode.
When in User Setup. UP or DN Use to scroll to the desired Main Menu item.
Use to scroll to the value or mode within a parameter. ENT Enters user into specific selection sub-menu from Main Menu Selection.
Displays current setting of selected Parameter. Enters the selected value or
setting into memory.
ESC Use as an escape key to exit back to Main Menu selection to avoid scrolling
to Return to MAIN MENU
The following pushbutton combinations can be used to more quickly set user selected values (i.e. Process Min and Max Values, etc.).
UP* + ESC Increases the second column digit. DN* + ESC Decreases the second column digit. UP* + DN Increases the third column digit. XXXXX DN* + UP Decreases the third column digit. UP* + ESC + DN Increases the fourth column digit. DN* + ESC + UP Decreases the fourth column digit.
*Must be pressed and held before other button(s) are pressed.
Note: Pushbuttons are momentary type and should be quickly pressed and released to initiate desired change,
unless otherwise instructed to press and hold.
2nd Column 3rd Column 4th Column
5.6 – CONFIGURATION PROGRAMMING
1. With power ON and initialization complete (see Section 5.2), press ENT then ESC then UP then ENT to activate the Operator menu. The display will indicate:
ENTER PASSWORD FOR
OPERATOR MENU
XXXX
Note: If Operator Menu password has been bypassed (see Section 5.7), the display will indicate as shown in Step 3
below.
2. Using UP and ENT, scroll to the numeric password for the Operator Menu. From the Factory, password is set for 1,111.
3. Once password is displayed, press ENT and display will indicate:
4. Press ENT and display will indicate:
By using UP and DN, the user can scroll through the following selections:
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OPERATOR MENU
OPERATOR PASSWORD
Main Menu Selection Description
between VELOCITY,
between VELOCITY,
Operator Password Selection Allows for the selection of password for the Operator Menu, and the
bypassing of the password
Flow Configuration Allows for the configuration of process variable such as: Duct size
and shape, process type, process maximum/units, and percent lockdown
Display Configuration Allows the selection of parameter to be displayed on Lines 2 & 3,
and display filter
Output 2 Parameter Selection Allows the selection Output 2 parameter
Low Pass Filter Selection Selects amount of filtering applied to the output and to the display
Output Signal Type Selection Allows the selection of signal type for Output 1 and 2
Transmitter Output Calibration Allows for the zeroing and spanning of transmitter analog Outputs
1 and 2
K-factor Configuration Turns K-factor ON or OFF and allows for the calculation or selection
of exponent and gain values
Menu Inactivity Timeout Selection Allows for the selection a time after which the unit returns to
normal operation if no activity in the Operator Menu
Network Configuration Turns the Network ON or OFF, and allows BACnet configuration
Flow Alarm Configuration (available only with BACnet Network Option)
Temperature Alarm Configuration (available only with BACnet Network Option)
Operator Menu Exit Returns display to Normal operation
Turns each alarm ON or OFF, select High and Low Setpoints, Deadband selection and Alarm Delay
Turns each alarm ON or OFF, select High and Low Setpoints, Deadband selection, and Alarm Delay
5. Once the desired selection is displayed, press ENT to enter its sub-menu.
Once the desired Selection is displayed, its sub-menu can be entered by pressing ENT. At any time while in the Operator Menu, User can return to Normal operation mode by pressing ESC or scrolling to:
OPERATOR MENU
and pressing ENT.
EXIT
To better understand the process of Configuration Programming, arrows with pushbutton designation have been included on the following flow chart of Display Configuration. This will aid in the navigation of the Configuration Programming Process.
Operator Menu
Display Configuration
DN
UP
ENT
ESC
ESC
ENT or ESC
Display Filter
Selection
DN
Line 2 Parameter
Selection
DN
Line 3 Parameter
Selection
DN
Return to
MAIN MENU
UP
UP
UP
ENT
ENT or ESC
ENT
ENT or ESC
ENT
ENT or ESC
Line 2 Parameter
Line 2 Parameter
TEMPERATURE
Display Filter
0 (None)
VELOCITY
UP or DN will scroll between 0 and 5
UP or DN wil scroll
TEMPERATURE, & CUSTOM TEXT
UP or DN wil scroll
TEMPERATURE, & CUSTOM TEXT
Output 2 Parameter
Selection
This example of navigation is similar for all Operator Menu selections.
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