Greystone Energy Systems CDD3B1 Series User manual

Page 1
INTRODUCTION
The carbon dioxide transmitter uses InfraredTechnology to monitor
CO2levels within a range of 0 - 2000 ppm. Options include a control
relay, override switch, up/down set-point control, relative humidity
sensor and temperature sensor.
The device includes Modbus protocol with 16 I/O registers and an
RS-485 MS/TP network connection to oer a single-point solution
for control of indoor air quality and comfort. Features include a
back-lit LCD and user menu for easy installation, eld-proven RH
sensor and user input controls to add local set-point and override
functions at the same network point.
BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the device. Failure to follow these
instructions may result in product damage. Do not use in an explosive or hazardous environment, with
combustible or ammable gases, as a safety or emergency stop device or in any other application where
failure of the product could result in personal injury. Take electrostatic discharge precautions during
installation. Do not exceed device ratings.
MOUNTING
The transmitter installs directly on a standard electrical box and should be mounted ve feet from the oor
of the area to be controlled. Do not mount the sensor near doors, opening windows, supply air diusers or
other known disturbances. Avoid areas where the detector is exposed to vibrations or rapid temperature
changes.
The cover is hooked to the base at the top edge and must be removed from the bottom edge rst. Use a small
Phillips screwdriver to loosen the security screw as shown in Figure 1.
Complete removal of the screw is not required. Use the screwdriver to
carefully pry each bottom corner if necessary. Tip the cover away from
the base and sit it aside as shown in Figure 2.
Sit the PCB aside until the base is mounted on the wall. For added
protection, place the PCB in the supplied anti-static bag.
Mount the base by screwing to an electrical box or directly to the wall
as shown in Figure 4. The mounting hole locations are shown on page
4.
After the base is screwed to an electrical box or directly to the wall
using the appropriate holes, remove the PCB from the anti-static bag,
feed connection wires through the center hole and place the top of
the PCB into the PCB holders on the backplate and snap the bottom of
the PCB into place as shown in Figure 4.
Making wiring connections as per the Wiring Illustrations on page 2
and install the decorative cover by placing the top of the cover into
the cover holder on the top of the backplate and snapping the bottom
into place as shown in Figure 4. Tighten the security screw with a
Phillips screwdriver.
Figure 1
Figure 2
Figure 4
Figure 3
Cover PCB Backplate
IN-GE-CDD3B1XXXMOD-01-03 11/19 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: [phone] Web: www.greystoneenergy.com
Room Carbon Dioxide
Transmitter with Modbus
CDD3B1 Series - Installation Instructions

Page 2
WIRING
Deactivate the 24 Vac/dc power supply until all connections are made
to the device to prevent electrical shock or equipment damage.
Follow proper electrostatic discharge (ESD) handling procedures
when installing the device or equipment damage may occur.
Use 22 AWG shielded wiring for all connections and do not locate the
device wires in the same conduit with wiring used to supply inductive
loads such as motors. Connect the cable shield to ground at the
controller only. Make all connections in accordance with national and
local codes.
Connect the 24 Vac/dc power supply to the terminals labeled POWER
and COMMON. Use caution if 24 Vac power is used and one side of
the transformer is earth grounded. In general, the transformer should
NOT be connected to earth ground when using devices with RS-485 network connections. The device is
reverse voltage protected and will not operate if connected backwards.
Connect the RS-485 network with twisted shielded pair to the terminals marked A(-), B(+) and SHIELD.
The positive wire connects to B(+) and the negative wire connects to A(-) and the cable shield must be
connected to the SHIELD terminal on each device. If the device is installed at either end of an RS-485
network, and end-of-line (EOL) termination resistor (121 Ω) should be installed in parallel to the A(-) and
B(+) terminals. This device includes a network termination jumper and will connect the (121 Ω) resistor
correctly on the PCB. Simply move the jumper to the EOL position and no external resistor is required. The
ground wire of the shielded pair should be connected to earth ground at the end of the network and the
master is not grounded. Do not run bus wiring in the same conduit as line voltage wiring or other wiring
that switches power to highly inductive loads such as contactors, coils, or motors.
A network segment is a single shielded wire loop run between several devices (nodes) in a daisy chain
conguration. The total segment length should be less than 4000 feet (1220 meters) and the maximum
number of nodes on one segment length is 64. Nodes are any device connected to the loop and include
controllers but do not include the EOL terminators. To install more than 64 devices, or to increase network
length, repeaters will be required for proper communication. The maximum daisy chain length (segment)
depends on transmission speed (baud rate), wire size and number of nodes. If communication is slow or
unreliable, it may be necessary to wire two daisy chains to the controller with a repeater for each segment.
An optional signal is the relay output available on the N. OPEN and RELAY COM terminals. The RELAY COM
terminal is NOT connected to the power supply COMMON terminal.The relay output is completely isolated
and has a Normally Open (NO) signal. This signal can be used to directly control an alarm or ventilation fan.
START-UP
Verify that the transmitter is properly wired and connections are tight. Apply power and note that the
CO2sensor chamber light ashes on and o. The LCD will indicate the software version number, the Auto
Cal status, the Modbus address, and the Baud Rate. Then the device will begin reading the sensor values
and display them on the LCD. The sensor operates on a 4 second interval and will update the output and
display every 4 seconds.
Figure 5
Figure 6 Building Controller Device 01 Device 02 Device 03
Set EOL Jumper
Connect Shield
One End Only
Power
COMMON
Power
COMMON
Power
COMMON
A(-)
B(+)
SHLD
A(-)
B(+)
SHLD
A(-)
B(+)
SHLD
Modbus Master
24 Vac / dc
Common
A(-)
B(+)
Shield
EOL
DOWN
A-
B+
SHIELD
COMMON
POWER
UP SAVE MENU
N. OPEN
RELAY COM
RELAY
CO2 SENSOR
0001246
EOL
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Page 3
OPERATION
In normal operation the device reads the CO2, RH, and temperature sensors and updates the register
values accordingly. The LCD displays the sensor values as determined by the display mode register.
If the device has the optional Up/Down set-point switches installed, pressing either the <UP> or
<DOWN> keys will cause the LCD to change to show the set-point value. The rst key press will display
the current setting of the Up/Down control from 0 to 100% (default). The display will show "Setpoint
- xx%" for about 5 seconds and then revert back to the sensor values again if neither the <UP>
or<DOWN> keys are pressed again. To increase the set-point, press the <UP> key while the LCD is in
set-point mode and each press will increase the set-point by 10% up to the 100% maximum value. To
decrease the set-point, press the <DOWN> key while the LCD is in set-point mode and each press will
decrease the set-point by 10% down to the 0% minimum value. After 5 seconds of no key activity, the
display will revert back to normal and the new set-point value will be saved. The setpoint units may be
changed as described in the menu section.
If the device has the optional Override switch installed, pressing the <OVERRIDE> key will cause the LCD
to change to show the override status. The display will show "Override - ON" for about 5 seconds and
then revert back to the sensor values again. The override cannot be turned OFF with the switch, it must
be reset via the Modbus Overridde_Switch_Reset Register.
SET-UP MENU
The menu has several items as shown below. To enter the menu, press and release the <MENU> key
while in normal operation. This will enter the Setup Menu, pressing the <MENU> key a second time
advances to the next menu item. The <UP> and <DOWN> keys are used to make changes to program
variables by scrolling through the available options. When a value is changed, use the <SAVE> key to
save it to memory and advance to the next menu item. No values are saved using the <MENU> key.
Setup Menu operation is explained below, the factory default values are shown. Note that items that are
not applicable to the hardware conguration are skipped on the device's setup.
Press and release the <MENU> key to enter the Setup Menu.
ModBus
Addr 01
Press the <UP> or <DOWN> keys to select a unique slave address from 1-255. Press
the <SAVE> key to save the change.
<MENU> Press to advance to next menu item
1. MAC ADDRESS
BaudRate
9600
Use the <UP> or <DOWN> keys to select a baud rate of 300, 600, 1200, 2400,
4800, 9600, 19200, 38400, 57600, 76800 or 115200.. Press <SAVE> key to save the
change.
<MENU> Press to advance to next menu item
2. BAUD RATE
Mod Mode
RTU
Use the <UP> or <DOWN> keys to toggle between RTU and ASCII modes. Press the
<SAVE> key to save the change. The factory default Modbus transmission mode is
RTU.
<MENU> Press to advance to next menu item
3. MOD MODE
ModBus
Parity N
Use the <UP> or <DOWN> keys to select a parity value of N (none), O (odd), or
E (even). Press the save key to save the change.
<MENU> Press to advance to next menu item
4. PARITY VALUE
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Page 4
ModBus
Stop 1
ModBus
CRC A001
ModBus
Del MI
Calibrat
1000 PPM
Use the <UP> or <DOWN> keys to toggle the stop bits between 1 and 2 (for some
congurations the value is xed). Press the <SAVE> key to save.
Use <UP> or <DOWN> to set the CRC value to A001 (CRC-16 reverse), 1021
(CITT), 8005 (CRC-16), or 8408 (CITT reverse), then <SAVE> the value.
Use the <UP> or <DOWN> keys to change the value from MI (minimum) to
50, 100, 150, 200, 250, 300, or 350ms. Press the <SAVE> key to save the value.
(minimum delay means just more than 3.5 character time delays, 4ms for 9600
baud rate, for example).
This item is used for 1000 ppm gas calibration and is explained in the Calibration
section.
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
5. STOP BITS
6. CRC VALUE
7. DELAY
8. CALIBRATION
Only if Relay option Installed
Relay
Test OFF
Use the <UP> or <DOWN> keys to toggle the relay ON or OFF. Press the
<MENU> key to turn the relay o and advance to the next item.
9. RELAY
BackLite
ENABLE
Use the <UP> or <DOWN> keys to enable or disable the LCD backlight. When
enabled the backlight is always on, when disabled it never lights. Press the
<SAVE> key to save the setting.
10. BACKLIGHT
Only if viewable LCD Installed
Setpoint
Mode %
Use the <UP> or <DOWN> keys to select the set-point mode. The default is %
for 0-100% (10% steps).
This can be changed to one of the following selections:
% for 0-100% setpoint (5 % steps)
%RH for 30 to 70 %RH setpoint (1 %RH steps)
ppm for 500 to 1500 ppm setpoint (50 pm steps)
°C1 for 18 to 24°C setpoint (0.5°C steps)
°C2 for 10 to 30°C setpoint (0.5°C steps)
°C3 for 16 to 26°C setpoint (0.5°C steps)
°F1 for 67 to 73°F setpoint (1°F steps)
°F2 for 60 to 80°F setpoint (1°F steps)
11. SET-POINT
Only if Set-point Option Installed
<SAVE> Press to exit the menu and return to normal operation or <MENU> to repeat the
menu.
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Page 5
MODBUS TROUBLE-SHOOTING
The CO2/RH/T device operates as a slave. It will not communicate unless a master is connected
to the network and sends a request for information, then the slave will answer. If the device does
not communicate properly, rst check that the communication wires are not reversed. Then check
the communication parameters in the menu in the following sequence: Slave address, baud rate,
transmission mode, parity bit, stop bit, RTU mode CRC polynomial and slave response delay.
The factory default Modbus address is 01 and each device must have its unique address to communicate
properly on the bus. Use the menu as described above to change the Slave address to a unique number
for each unit.
The default Modbus baud rate is 9600. Use the menu to change the baud rate to the correct setting.
The default transmission mode is RTU. If this is incorrect, use the menu to change the transmission mode
to ASCII.
The default Modbus parity is N for None. If this is not correct, use the menu to change the parity from
None to Odd or Even.
The default stop bits is 1. Use the menu to change the stop bit setting to 2. For some congurations the
value is xed.
The default Modbus CRC value is A001. The menu can be used to change this setting. This only applies
to RTU mode and has no eect in ASCII mode. It is the CRC polynomial setting and can be changed
between A001, 1021, 8005 or 8408.
The default Modbus delay is minimum (0). This can be changed as described above. It is the slave
response delay and can be set from minimum to 350ms. For example, the minimum delay means 3.5
character time delays or 4ms for 9600 baud rate.
CALIBRATION
Calibration with gas requires a eld calibration kit consisting of an LCD, a bottle of 1000 ppm CO2 gas, a
tank pressure regulator with ow restrictor and the necessary tubing to connect to the device.
Note that because of the Automatic Calibration Mode and other technology incorporated into the CDD
series, only a single point 1000 ppm calibration is required to meet specied accuracy.
Turn the regulator on/o knob fully o and attach it to the 1000 ppm CO2 gas bottle and rmly
tighten it by hand. Remove the cover of the unit to be calibrated to expose the gas sensor chamber.
The tubing from the gas bottle can be connected to either port on the chamber after the plastic cap is
removed. Gently remove one cap and connect the tubing, note that strong shock or vibration can aect
calibration.
Ensure the device has been operating normally for at least ve minutes before applying gas. Slowly turn
the valve knob on the regulator to let the gas begin owing.
The regulator will restrict the ow rate to the specied 100 ml/min. After a brief period the gas will ow
into the chamber and the CO2 reading on the LCD will begin to approach 1000 ppm. Wait 1 to 2 minutes
until the CO2 reading stabilizes.
Enter the Setup menu and use the <MENU> key to advance to Calibrat 1000 PPM. Press and hold the
<SAVE> key for 2 seconds and the display will change to Waiting Calibrat then to Waiting 5 minute to
indicate that the process of reprogramming the internal calibration setting is taking place.
This calibration process takes about 5 minutes and the LCD will count down the minutes. Do not disturb
the unit or the gas ow during this period. When calibration is complete the unit will display Calibrat
Done. Press the <SAVE> key to return to normal operation and then the gas can be shut o.
Disconnect the tubing and replace the cap on the sensor chamber as calibration is complete.
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Page 6
SPECIFICATIONS
CARBON DIOXIDE SENSOR
Measurement Type ...................Non-Dispersive Infrared (NDIR), diusion sampling
Measurement Range................0-2000 ppm
Standard Accuracy....................±30 ppm @ 1000 ppm @ 22°C (72°F) compared to certied calibration gas
Temperature Dependence.....0.2 %FS per °C
Stability .........................................<2 %FS over life of sensor (15 years typical)
Pressure Dependence..............0.13% of reading per mm Hg
Altitude Correction...................Programmable from 0-5000 ft via Modbus
Response Time ...........................<2 minutes for 90% step change typical
Warm-up Time............................<2 minutes
INTERFACE
Hardware......................................2 wire RS-485
Software........................................Native Modbus MS/TP protocol (RTU or ASCII)
Baud Rate .....................................Locally set to 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, or 76800
MAC Address Range.................Locally set to 1-255 (factory default is 1),
(255 devices max on one daisy chain)
LCD DISPLAY
Resolution....................................1 ppm CO2, 1 %RH, 0.1°C (0.1°F)
Size..................................................35mm W x 15mm H (1.4" x 0.6") alpha-numeric 2 line x 8 characters
Backlight.......................................Enable or disable via keypad
OPTIONAL TEMPERATURE SENSOR
Sensing Element........................10K thermistor, ±0.2°C (±0.4°F)
Resolution....................................0.1°C (0.2°F)
Range.............................................0 to 35°C (32 to 95°F)
OPTIONAL RELATIVE HUMIDITY SENSOR
Sensor............................................Thermoset polymer based capacitive
Accuracy .......................................±2 %RH
Range.............................................0-100 %RH, non-condensing
Resolution....................................1 %RH
Hysteresis .....................................±3 %RH
Response Time ...........................15 seconds typical
Stability .........................................±1.2 %RH typical @ 50 %RH in 5 years
OPTIONAL RELAY OUTPUT
Contact Ratings..........................Form A contact (N.O.), 2 Amps @ 140 Vac, 2 Amps @ 30 Vdc
Relay Trip Point...........................Programmable 500 to 1500 ppm via Modbus
Relay Hysteresis..........................Programmable 25 to 200 ppm via Modbus
GENERAL
Power Supply............................... 20 to 28 Vac/dc (non-isolated half-wave rectied)
Consumption............................... 80 mA max @ 24 Vdc, 140 mA max @ 24 Vac with all options
Protection Circuitry................... Reverse voltage protected, overvoltage protected
Sensor Coverage Area..............100 m2(1000 ft2) typical
Operating Conditions............... 0 to 50°C (32 to 122°F), 0 to 95 %RH non-condensing
Optional Override Switch........ Front panel push-button available as Modbus register
Optional Set-point Control..... Front panel push-buttons available as 0 to 100%, 30 to 70 %RH,
500 to 1500 ppm, 18 to 24°C, 10 to30°C, 16 to 26°C 67 to 73°F,
or 60 to 80°F as Modbus register
Wiring Connections................... Screw terminal block (14 to 22 AW)
Enclosure ....................................... White ABS, IP30 (NEMA 1)
84mm W x 117mm H x 29mm D (3.3" x 4.6" x 1.15")
Country of Origin........................ Canada
DIMENSIONS
84 mm
3.3“
119 mm
4.7“
29 mm
1.15 “
82.6 mm
3.25 “
58 mm
2.3 “
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PRINTED IN CANADA
Page 7
NETWORK SETUP GUIDE
The network setup guide describes the implementation of the BACnet® or Modbus protocol. It is intend-
ed to assist control system programmers who may need to add support to their systmes to communicate
with the device.
Modbus setup guide download is available online.
MODBUS PROTOCOL
https://downloads.greystoneenergy.com/SG/SG-CDD3B1XXXMOD.pdf
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