Siemens BACnet ATEC Specifications

BACnet ATEC
Start-up Procedures
Siemens Industry, Inc.
Table of contents
Before You Begin ......................................................................................4
Setting Controller Address ....................................................................... 5
Setting the Application .............................................................................5
Enabling Actuators ...................................................................................6
Specifying Motor Setup ............................................................................................. 7
Verifying Actuator Setup ............................................................................................ 7
Setting Number of Heat Stages ................................................................ 7
Selecting Automatic Calibration Option .................................................. 8
Setting Room Temperature Setpoints ..................................................... 9
Configuring the Room Unit .................................................................... 10
Setting Override Time ............................................................................. 10
Configuring Universal Inputs (UIs) ........................................................ 10
Enabling Wall Switch .............................................................................. 11
Setting Duct Area .................................................................................... 11
Setting Flow Coefficient ......................................................................... 12
Setting Flow Sensor Factors .................................................................. 13
Setting Airflow Setpoints........................................................................ 14
Setting Room Temperature Offset (optional) ........................................ 15
Configuring BACnet Parameters ........................................................... 16
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Before You Begin
Before You Begin
NOTE:
WCIS version 3.0 or later must be used to configure Siemens Building
Technologies BACnet MS/TP Equipment Controllers.
Do not check the Metric checkbox in the Device Properties dialogue box if the
controller is communicating through the MS/TP driver in the field panel. Metric
can be checked only if the controller is communicating through a router. If you
need metric and the controller is communicating through the MS/TP driver in the
field panel, then the Metric checkbox in the Device Properties dialogue box must
be unchecked and the conversion must be handled in the field panel.
Communication and DO Indicators
The BACnet Actuating Terminal Equipment Controller has LEDs to indicate
communication (yellow) and DO (digital output, if present) status BST (green).
The RX LED will flash for data packets received by the actuator from the MS/TP
network. The TX LED will flash for data packets sent by the actuator to the MS/TP
network. Each DO (3 to 5) has an associated LED located above its termination point.
This LED point is on when the associated DO is commanded ON otherwise, it is OFF.
The BACnet Actuator will attempt to communicate with other devices as soon as it
powers up. The TX LED will start flashing as it attempts to connect and transfer data.
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Setting Controller Address
Setting Controller Address
Set CTLR ADDRESS to the BACnet MS/TP MAC address. (0 through 127 = Master;
128 through 254 = Slave).
NOTE:
Set the controller address and MS/TP network baud rate prior to connecting the
controller to the network. See Configuring BACnet Parameters [ 16].
Setting the Application
Add the TEC to your job database and select one of the following applications.
Application Description
Application Number
VAV Cooling Only
2860
VAV Cooling or Heating
2861
VAV with Electric Reheat or Baseboard Radiation
2862
VAV with Hot Water Reheat
2863
VAV Series Fan Powered with Electric Reheat
2864
VAV Series Fan Powered with Hot Water Reheat
2865
VAV Parallel Fan Powered with Electric Reheat
2866
VAV Parallel Fan Powered with Hot Water Reheat
2867
VAV Slave Mode
2897
After you set the application, sensor altitude, tubing length, tubing internal diameter,
UI1 and UI2 configuration point, the controller goes through a shut-down/load
sequence as it switches from slave mode to the application selected. After the
application loads, the calibration cycle begins.
At the start of the calibration cycle, the controller automatically sets CAL AIR to YES.
When the cycle is complete, CAL AIR returns to NO.
The air velocity sensor calibration cycle begins within three minutes of an application
start-up or initialization, depending on the controller’s address. After this delay, the
calibration cycle takes from 2 to 5 minutes to complete. The air damper closes during
calibration.
NOTE:
You can continue the startup procedure while calibration is underway. However,
the controller will ignore commands to control end devices (such as the damper)
until calibration of the air velocity sensor is finished.
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Enabling Actuators
Enabling Actuators
CAUTION
The controller's DOs control only 24 Vac loads.
The maximum rating is 12 VA for each DO.
The points that determine actuator run times are:

MTR 1 TIMING (damper acutator)

MTR 2 TIMING (valve actuator, Application 2863, 2865 and 2867)
Your application may not have or use MTR2.

Use and/or to set run time(s) for the actuator(s) used by your application.
Damper Actuator Run Time
Damper Actuator
Setting (seconds)
50 Hz
60 Hz
GDE131.1
125
90
GLB131.1
150
125
Valve Actuator Run Time
Damper Actuator
Setting (seconds)
50 Hz
60 Hz
SSB81U, floating control fail in
place
180
150
SSC81U, floating control fail in
place
150
125
SSC81.5U, floating control fail-safe
125
125
SQS85.53U, floating control spring
return
35
30
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Setting Number of Heat Stages
Specifying Motor Setup
MTR SETUP determines which actuators are controlled by the application and whether
they are direct or reverse acting. Set MTR SETUP according to Table MTR SETUP
Values.
NOTE:
When MTR SETUP is changed, all enabled actuators will calibrate. Wait until
each actuator has completed its calibration before continuing.
MTR SETUP Values
Motor 1 (Damper)
Motor 2
Enabled
Enabled and Reversed
Not Used
1 (default)
3
Enabled
5
7
Enabled and Reversed
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15
Verifying Actuator Setup
1. Command all actuators closed. Verify that they close and remain closed. If not,
adjust the setting for MTR SETUP according to Table MTR SETUP Values.
2. If any of the actuators still do not close completely, then the actuators have been
installed or set up incorrectly. See the installation instructions (550-031), the iKnow
Troubleshooting Tool, or contact Field Support.
Setting Number of Heat Stages
Depending on the application, HTG STG CNT (if present) refers to electric heat stages
used (enabled), some point names may vary.

For electric heat applications, check the hardware to verify the number of electric
heat stages wired to the controller (1 to 3 stages without fan or 1 to 2 stages with
fan) and set HTG STG CNT to this value.
CAUTION
For installations using electric heat coils, never set min airflow settings to 0.
Equipment damage can occur if electric heat is on without airflow.
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Selecting Automatic Calibration Option
Selecting Automatic Calibration Option
Using Table CAL SETUP Options set CAL SETUP to the value that best meets your
job requirements.
If appropriate, change CAL TIMER from the default of 12 hours. This setting applies
only if your choice for CAL SETUP includes Option 4.
NOTE:
The air velocity sensor should be calibrated at least once every 24 hours. Make
sure that the sensor has been calibrated before balancing takes place, as this will
affect the balancer’s results.
CAL SETUP Options
CAL SETUP
Description
0
Calibration occurs ONLY when the point CAL AIR is set to YES.
1
Calibration occurs when the field panel commands a day/night mode
changeover. Actual calibration is subject to a time delay of 0, 1, 2, or 3
minutes. This delay is determined by the point CTLR ADDRESS divided
by 4. The remainder is the time delay in minutes.
For example, If CTLR ADDRESS = 11, then the controller will wait 3
minutes (11 ÷ 4 = 2 R3) after it receives the day/night mode changeover
command before beginning the calibration routine.
2
Calibration occurs immediately after the override switch is depressed.
4 (factory default
value)
Calibration occurs on the time interval set in the point CAL TIMER.
For example, if CAL TIMER = 12, then the calibration period is 12 hours.
Actual calibration is subject to a time delay based on the value of CTLR
ADDRESS. See the example in Option 1.
NOTE:
Options can be combined by summing their numbers. For example, to calibrate
as in Options 1 and 2, set CAL SETUP to 3.
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Setting Room Temperature Setpoints
Setting Room Temperature Setpoints

Day (or occupied) cooling setpoint: DAY CLG STPT

Day (or occupied) heating setpoint: DAY HTG STPT

Night (or unoccupied) cooling setpoint: NGT CLG STPT

Night (or unoccupied) heating setpoint: NGT HTG STPT
1. If the room temperature sensor has a setpoint dial that will be used, set STPT DIAL
to YES. Otherwise, set STPT DIAL to NO.
−
Set RM STPT MIN and RM STPT MAX for the minimum and maximum
allowable room temperature setpoint values, respectively. Valid values range
from 55° to 95°F (13° to 35°C). Default values are 55°F (13°C) for RM STPT
MIN and 90°F (32°C) for RM STPT MAX.
2. Setpoint dial configured with a heating/cooling deadband (default).
−
To allow the controller to operate with a heating/cooling deadband (functioning
the same as provided when the setpoint dial is not present) the following
configuration should be used.
−
Set the DAY HTG STPT less than the DAY CLG STPT by the deadband (or
zero energy band) that is desired. (for example, DAY HTG STPT = 70°F; DAY
CLG STPT = 74°F, providing a deadband of 4 degrees). Only the difference
between these values is used to determine the setpoint that will be used.
−
As described below, the setpoint(s) for heating/cooling will be 1/2 of the
deadband above or below the setpoint dial value.
 When HEAT.COOL equals HEAT, then:
 CTL STPT will equal RM STPT DIAL – 0.5 * (DAY CLG STPT – DAY HTG
STPT) and will be limited by RM STPT MIN and RM STPT MAX.
 When HEAT.COOL equals COOL, then:
 CTL STPT will equal RM STPT DIAL + 0.5 * (DAY CLG STPT – DAY HTG
STPT) and will be limited by RM STPT MIN and RM STPT MAX.
NOTE: A space where the deadband is used can be more energy efficient than
a space where the deadband is not being used
3. Setpoint dial configured for zero heating/cooling deadband.
−
When the job specification requires a common heating and cooling temperature
setpoint, the following configuration should be used.
−
Set DAY HTG STPT equal to DAY CLG STPT. This will configure the setpoint
deadband equal to zero.
−
In addition, when a setpoint deadband equals zero, then:
−
CTL STPT will equal RM STPT DIAL, and will be limited by RM STPT MIN and
RM STPT MAX.
NOTE: A space where the heating/cooling deadband is zero may be more
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Configuring the Room Unit
comfortable than a space where the deadband is being used, but may use more
energy.
4. Set the room temperature setpoints to the desired values. Heating setpoints are not
present in cooling only applications.)
Configuring the Room Unit
STAT SUPV values are additive; set STAT SUPV to the sum of the configured
selection. A value of 3 indicates the stat has both humidity and temperature..

0 - for the Sensing only Room Unit.

1 - for communicating Room Unit with Full featured Room Unit.

2 - for communicating Room Unit with humidity.
Setting Override Time
If using night/unoccupied override, set OVRD TIME to the number of whole hours that
an override should last. If OVRD TIME equals 0 (default), this feature is disabled.
Configuring Universal Inputs (UIs)
Configure each Universal Input; using one of the following options for each UI.
(UI1 CFG, UI 2 CFG)

0 - DI

1 - 10K (Temperature thermister)

2 - 0-10V (0 to 100%)

3 - 4-20mA (0 to 100%)
NOTE:
The controller goes through a shut-down/load sequence after setting.
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Enabling Wall Switch
Enabling Wall Switch
If a wall switch is used for day/night control, enable it by setting WALL SWITCH to
YES. In addition, UI 2 must be configured for digital input (set to 0).
Otherwise, leave WALL SWITCH at its default value of NO.
If WALL SWITCH is not enabled, UI 2 can be used as a Spare (Analog or Digital).
Setting Duct Area
If provided, enter the duct area (sq ft or sq m) into DUCT AREA (and also into
HTGDUCT AREA, where applicable) and continue to Setting Flow Coefficient.
If you do not know the duct area, use the following table:
Area =
Round Duct
Rectangular Duct
Area in Sq. Ft.
(Dimensions in inches)
(π x R2)/144
Width x Height ∕144
Area in Sq. M
(Dimensions in centimeters)
(π x R2)/10,000
Width x Height∕10,000
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Setting Flow Coefficient
Setting Flow Coefficient
1. Set FLOW COEFF to the appropriate value found in Table Box Manufacturer Flow
Coefficients. This value is a starting point for the air balancer.
2. To fine tune the flow coefficient use the following formula:
 new flow coefficient = (actual volume/controller volume) x old flow coefficient
The actual volume is the actual value obtained from the balancer’s
measurements. The controller volume is the value obtained from AIR VOLUME.
3. If the controller volume is not within 5% of the actual volume, repeat the procedure
until it is within 5%.
Box Manufacturer Flow Coefficients
Manufacturer
Sensor Type
Value
Anemostat
2-pipe without orifice
2-pipe with orifice
Spider without orifice
Spider with orifice
0.79
0.59
0.73
0.39
Carnes
2-pipe
Flow cross
0.66
0.59
Carrier
0.59
E.H. Price / Siemens Building Technologies Lab Terminal
Boxes
0.78
Environmental Technologies
0.79
Krueger
0.68
Metal Aire
0.72
Nailor Industries
0.69
Titus
0.60
Trane
0.66
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Setting Flow Sensor Factors
Setting Flow Sensor Factors
The BACnet ATEC models 2301 and 0001 use mass airflow sensors to measure duct
differential pressure. A differential pressure calibrated sensor is used over mass flow to
make the sensor compatible with previous controller designs. Since the flow
measurement is done based on the mass of the air, the BACnet ATEC has several
new parameters that can/should be adjusted to help reduce airflow measurement
errors.
The new setup points are:

(1) altitude, AIR ALTITUDE, [default is 700 feet],

(2) airflow pickup to airflow sensor total tubing length, TUBE LEN, (to and from
pickup) [default is 6 feet]

(3) inside tubing diameter, TUBE DIAMETE, [default is 187 inches].
If you only set one of these parameters, it should be the installed altitude of the
controller. This single parameter adds the most effect on sensor error.
NOTE:
The controller goes through a shut-down/load sequence after setting.
Typical correction factor applied to sensor output.
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Setting Airflow Setpoints
Setting Airflow Setpoints
NOTE:
Maximum flow(s) must be set ≥ minimum flow(s).
1. Set CLG FLOW MIN to the desired minimum cooling airflow setpoint.
2. Set CLG FLOW MAX to the desired maximum cooling airflow setpoint.
 Application 2861 through 2867
3. Set HTG FLOW MIN to the desired minimum heating airflow setpoint.
4. Set HTG FLOW MAX to the desired maximum heating airflow setpoint.
5. Set FLOW START to the heating loopout percentage that the flow will start to
modulate in the heating mode. (that is, at HTG FLOW MIN).
6. Set FLOW END to the heating loop out percentage that the flow will end
modulation (that is, at HTG FLOW MAX).
 In addition to the flow setpoints in the heating mode (HTG FLOW MIN and HTG
FLOW MAX), the parameters FLOW START (default is 0) and FLOW END (default
is 100) will determine what portion of the HTG LOOPOUT the flow will modulate
the heating mode. CAUTION: If FLOW START equals FLOW END, the flow will not
modulate even if HTG FLOW MAX is greater than HTG FLOW MIN.
NOTE:
For Applications 2862, 2863, 2864 and 2866, HTG FLOW MAX should be less
than CLG FLOW MAX. Otherwise, cold supply air may cool rather than heat the
space in heating mode. A typical setting for HTG FLOW MAX is 50% or less of
CLG FLOW MAX.
CAUTION
For electric heating coils in the air terminal unit without a terminal fan, do not set
HTG FLOW MIN to 0.
Equipment damage may occur if insufficient air flow is present with electric heat
ON.
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Setting Room Temperature Offset (optional)
Setting Room Temperature Offset (optional)
When the room has stabilized, take a precision temperature reading over a period of
time at the room temperature sensor, record any difference between this reading and
the value of ROOM TEMP and set this difference value (to the nearest 0.25°F
(0.14°C)) into RMTMP OFFSET.
Example
If the actual room temperature is 72.0°F (22.2°C), and the value of ROOM TEMP is
73.0°F (23.8°C), then the value entered into RMTMP OFFSET is –1.0. In this case, the
value of ROOM TEMP would read the raw value 73.0°F (23.8°C), but the value of CTL
TEMP would read 72.0°F (22.2°C).
CTL TEMP = ROOM TEMP + RMTMP OFFSET
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Configuring BACnet Parameters
NOTE:
WCIS version 3.0 or later must be used to configure Siemens Building
Technologies BACnet MS/TP Equipment Controllers.
Do not check the Metric checkbox in the Device Properties dialogue box if the
controller is communicating through the MS/TP driver in the field panel. Metric
can be checked only if the controller is communicating through a router. If you
need metric and the controller is communicating through the MS/TP driver in the
field panel, then the Metric checkbox in the Device Properties dialogue box must
be unchecked and the conversion must be handled in the field panel.
Using WCIS, do the following:
1. From the Device menu, select Device Properties to configure BACnet parameters.
−
Object Name – unique to BACnet network, (12 character RAD50 limit).
−
Object ID – unique to BACnet network, valid values are 0 through 4,194,303.
−
Description – description of controller (60 character limit).
−
Location – physical location of controller (60 character limit).
−
MSTP Network Baud Rate – options; 9600, 19200, 38400 or 76800, default
is19200.
2. Configuring the Room Unit port.
−
If using a sensing only Room Unit, the baud rate can be 1200 to 76800. For
optimal use with WCIS use 38400.
−
If using a communicating Room Unit, the baud rate must be set to 1200.
3. Press the Write button. The controller accepts the configuration values and then
resets.
 When the BACnet MS/TP TEC is successfully installed, the RX and TX LEDs flash
On/Off rapidly and continuously.
The startup is complete upon completion of BACnet parameters configuration.
Issued by
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089, USA
Tel. +1 847-215-1000
Document ID
140-0893, Rev AA
Edition
1/12/2010
© 2010 Copyright Siemens Industry, Inc.
Technical specifications and availability subject to change without notice.
Manual BACnetATEC Start-up
Procedures
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