Honeywell EXCEL 10 W7752D User Manual
Excel 10
W7752D,E,F,G,J AND W7754K,L,M,P
FAN COIL UNIT CONTROLLERS
LNS PLUG-INS
HONEYWELL EXCEL 5000 OPEN SYSTEM
USER GUIDE
CONTENTS
Introduction .................................................................................................................................................................................. 1
Description of Devices ................................................................................................ 1
Products Covered ....................................................................................................... 2
Organization of Manual ............................................................................................... 2
Applicable Literature ................................................................................................... 2
Product Names ........................................................................................................... 2
Control Application...................................................................................................... 3
Control Provided ......................................................................................................... 3
Setpoints.......................................................................................................... 4
Bypass............................................................................................................. 6
LED/LCD ......................................................................................................... 6
Energy-Saving Features .................................................................................. 6
Occupancy Status............................................................................................ 7
Safety Features ............................................................................................... 8
Operating Modes ............................................................................................. 8
Construction................................................................................................................ 9
Excel 10 W7752 FCU Controllers .................................................................... 9
Excel 10 W7754 FCU Controllers .................................................................... 9
Controller Performance Specifications........................................................... 11
Configurations........................................................................................................... 12
General.......................................................................................................... 12
Fan Type ....................................................................................................... 12
Type of Heating and Cooling Equipment ....................................................... 13
Reheat Output ............................................................................................... 14
Digital Input.................................................................................................... 14
Excel 10 Wall Module Options ....................................................................... 15
Abbreviations and Definitions.................................................................................... 16
Application Steps ....................................................................................................................................................................... 17
Overview................................................................................................................... 17
Step 1. Plan the System............................................................................................ 17
Step 2. Determine Other Bus Devices Required....................................................... 17
Step 3. Lay Out Communications and Power Wiring ................................................ 18
LONWORKS Layout ......................................................................................... 18
Power Wiring ................................................................................................. 19
Step 4. Prepare Wiring Diagrams ............................................................................. 19
General Considerations ................................................................................. 19
Terminal Block Assignment and Wiring Example for the W7752 Controller... 21
Terminal Block Assignment and Wiring Example for the W7754 Controller... 22
LONWORKS Termination ................................................................................. 23
Step 5. Order Equipment .......................................................................................... 24
Step 6. Configure Controllers.................................................................................... 25
General.......................................................................................................... 25
Output............................................................................................................ 26
Input............................................................................................................... 27
Equipment Control ......................................................................................... 28
Fan ................................................................................................................ 28
Switching Levels ............................................................................................ 29
Zone Options ................................................................................................. 29
Miscellaneous ................................................................................................ 29
® U.S. Registered Trademark EN2B-0285GE51 R0909
Copyright © 2009 Honeywell Inc.
All Rights Reserved
EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
PID .................................................................................................................30
Commissioning...............................................................................................30
ID Number ......................................................................................................30
Step 7. Troubleshooting.............................................................................................30
Troubleshooting Excel 10 FCU Controllers and Wall Modules .......................30
Alarms ............................................................................................................30
Broadcasting the Service Message ................................................................32
Manual Mode..................................................................................................32
Appendix A: Using An LNS tool to Commission a Fan Coil Unit ............................................................................................33
Temperature Sensor Calibration................................................................................33
Appendix B: Configuring for Master/Slave Operation .............................................................................................................34
Output Configuration Options ....................................................................................34
Input Configuration Options .......................................................................................34
Equipment Control Options........................................................................................34
Zone Control Options.................................................................................................34
Network Variable Binding...........................................................................................34
Appendix C: LON Interface.........................................................................................................................................................35
Revision History
page no. change
13 Information on configuration of actuator runtime and on valve synchronization has been added
EN2B-0285GE51 R0909
EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
INTRODUCTION
Description of Devices
The W7752D,E,F,G, and J Controllers and W7754K,L,M,N,
and P Controllers are Fan Coil Unit Controllers belonging to
the Excel 10 product line. Excel 10 FCU Controller systems
control the space temperature in a given room by regulating
the heating and/or cooling equipment which control the temperature of the air delivered to that space and the fan which
controls air flow. Reheat coils are often included at the fan coil
unit. Excel 10 FCU Controllers are capable of stand-alone
operation; however, optimum functional benefits are achieved
when the network communication capabilities are used.
A family of direct wired wall modules with a temperature
sensor for space temperature measurement, setpoint adjustment, bypass push-button, status LED, and LCD display can
be used in conjunction with Excel 10 FCU Controllers.
Excel 5000
The wall modules are available in a variety of models
incorporating various combinatinos of the following options:
• Setpoint adjustment
• Bypass pushbutton and LED
• Fan Switching
• See Table 7 on page 12 for a complete list of wall
modules options
Excel 10 FCU Controllers connect to a LonWorks network and
interoperate with 3
rd
-party nodes.
PCLTA20
LonWorks network
PCC10
Excel 10 W7754
Hone ywel l
FCU Controller
Excel 10
wall module
Fig. 1. Typical system overview
Excel 10 W7752
FCU Controller
Excel 10
wall module
Ho ne ywe ll
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Products Covered
This System Engineering Guide describes how to apply the
Excel 10 FCU Controllers and the accessories to typical FCU
applications. The specific devices covered include:
• W7752D,E,F,G, and J FCU Controllers.
• W7754K,L,M,N, and P FCU Controllers.
• T7460 Wall Modules.
• T7560 Wall Modules.
Organization of Manual
The Introduction and Application Steps 1 through 5 provide
the information needed to make accurate ordering decisions.
Application Step 6 and the Appendices include configuration
engineering that can be started using a LNS tool after the
devices and accessories are ordered. Application Step 7 is
troubleshooting. Information provided in support of the use of
third-party LonWorks communication packages to configure
FCU Controllers is found in the Appendices.
The organization of the manual assumes a project is being
engineered from start to finish. If you are adding to, or
changing an existing system, the Table of Contents can guide
you to the relevant information.
Applicable Literature
The following is a list of documents that contains information
related to the Excel 10 FCU Controller. Form No.
Title
EN0B-0376GE51 Excel 10 W7752D,E,F,G,J FCU
Controller Specification Data
EN0B-0453GE51 Excel 10 W7754K,L,M,N,P FCU
Controller Specification Data
EN1B-0250GE51 Excel 10 W7752D,E,F,G,J FCU
Controller Installation Instructions
EN1B-0251GE51 Excel 10 W7754K,L,M,N,P FCU
Controller Installation Instructions
EN2B-0285GE51 Excel 10 FCU Controller LNS Plug-Ins
User Guide
74-3083 Excel 10 T7460 Wall Modules
Specification Data
95-7610 Excel 10 T7460 Wall Modules
Installation Instructions
EN0B-0237GE51 Excel 10 T7560 Wall Modules
Specification Data
EN1B-0146GE51 Excel 10 T7560 Wall Modules
Installation Instructions
95-7554 Excel 10 FTT/LPT 209541B Termination
Module Installation Instructions
Product Names
The W7752 Controller is available in five models:
• W7752D FCU Controller with 230 Vac power supply and
with relay suitable for reheat applications.
• W7752E FCU Controller with 230 Vac power supply
without reheat relay.
• W7752F FCU Controller with 115 Vac power supply with
reheat relay suitable for reheat applications.
• W7752G FCU Controller with 115 Vac power supply
without reheat relay.
• W7752J FCU Controller with 100 Vac power supply
without reheat relay.
The W7754 Controller is available in five models:
• W7754K FCU Controller with 230 Vac power supply, one
triac output, and one digital output suitable for attachment
to a solid-state relay employed for low-voltage PulseWidth Modulated (PWM) control in high-current electric
reheat applications.
• W7754L FCU Controller with 24 Vac power supply and
two triac outputs.
• W7754M FCU Controller with 230 Vac power supply.
• W7754N FCU Controller with 230 Vac power supply and
two triac outputs.
• W7754P FCU Controller with 230 Vac power supply, four
triac outputs, and an extra, fourth relay suitable for reheat
applications.
The FCU Controllers can use any of the following Excel 10
wall modules:
• T7460A with temperature sensor.
• T7460B with temperature sensor and setpoint adjustment.
• T7460C with temperature sensor, setpoint adjustment, and
bypass button and LED.
• T7460D with temperature sensor, setpoint adjustment and
5-position fan switch.
• T7460E with temperature sensor, setpoint adjustment,
bypass button and LED, and 3-position fan switch.
• T7460F with temperature sensor, setpoint adjustment,
bypass button and LED, and 5-position fan switch.
• T7560A with temperature sensor, unit enable button,
setpoint adjustment, bypass button, LCD display and
configurable fan override with up to five settings.
Other products:
• C7608A Return Air Sensor
Refer to the Table 15 (see Application Steps, Step 5. Order
Equipment) for complete listing of all available part numbers.
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Control Application
Fan coil unit systems in commercial buildings control room
temperature through the control of heat and/or cold water
valves and fan speed. Electric reheat coils may also be used
in the system. The Excel 10 FCU Controller is located in the
FCU and is typically connected to an Excel 10 wall module
e.g. Excel 10 W7754
FCU Controller
Hone ywe ll
D-71101 Schönaich
Made in Germany
which incorporates a temperature sensor, setpoint and fan
speed controls, and a bypass or override button. Fig. 2 shows
a typical FCU ontrol application.
window
contact
Excel 10
wall module
LonWorks network
Fig. 2. Typical Fan Coil Unit control application
Control Provided
Excel 10 FCU Controllers provide room temperature control
for two- and four-pipe fan coil units with optional electric
heating coil. The basic control sequence is shown in Fig. 3.
As space temperature falls below the heating setpoint, the
heating output is increased. As space temperature
increases above the cooling setpoint, the cooling output is
modulated to 100%. Switching levels for staged
heating/cooling and fan speeds are configurable. The fan
may still be configured to run continuously during the zero
energy band in the "occupied" mode. Additional
configurable fan control features include fan minimum
ON/OFF times, run-up, and overrun-times.
Excel 10 FCU Controllers use a PID control algorithm in
which each of the three parameters can be configured.
There are additional configurable boost parameters ("PID
Boost:" "Cooling" and "Heating") which specify a range
outside of which the heating or cooling outputs are turned
ON fully for faster response (in the case of thermal
actuators, this specifies the control hysteresis). The
controllers are delivered with factory defaults for each of the
parameters.
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Fig. 3. Control sequence diagram
Setpoints
Setpoint Knob
The Excel 10 FCU Controllers may be hardwired to an Excel
10 wall module equipped with a setpoint knob. When the
Excel 10 FCU Controller has been configured (using the LNS
plug-in tool) to read input from the wall module's setpoint
knob, the value from the setpoint knob is used to calculate the
"occupied" setpoint for the heating and the cooling modes.
There are two configurations which determine how the
setpoint used by the control algorithm is calculated: "relative"
(or "offset") and "absolute middle". When configured for
"relative", the Excel 10 wall module setpoint knob represents
a number from -9...+9 DDF(-5...+5 K) which is added to the
configured "occupied" and "standby" setpoints for the heating
and the cooling modes. When configured to "absolute
middle", the setpoint knob becomes the mid-point of the Zero
Energy Band (ZEB) extending between the "occupied" or
"standby" setpoints for the heating and the cooling modes.
The range of the ZEB is found by taking the difference
between the "occupied" or "standby" setpoints configured for
the heating and the cooling modes; in the case of "absolute
middle", the current "occupied" and "standby" setpoints are
therefore found as follows:
When the Excel 10 FCU Controller is in the "occupied" mode:
nvoActiveSetPt (in cooling mode) =
nvoSensor.remote_set_point + (Cooling Occupied
Setpoint - Heating Occupied Setpoint) / 2
nvoActiveSetPt (in heating mode) =
nvoSensor.remote_set_point - (Cooling Occupied
Setpoint - Heating Occupied Setpoint) / 2
for Standby:
nvoActiveSetPt (in cooling mode) =
nvoSensor.remote_set_point + (Cooling Standby
Setpoint - Heating Standby Setpoint) / 2
nvoActiveSetPt (in heating mode) =
nvoSensor.remote_set_point - (Cooling Standby
Setpoint - Heating Standby Setpoint) / 2
When the Excel 10 FCU Controller is in the "unoccupied"
mode, the remote setpoint knob is ignored, and the configured setpoints for this mode are used instead.
Setpoint Limits
Setpoints are limited to the range of 50...95°F (10...35°C).
The value of the setpoint knob is limited to the range provided
by the configuration parameters Maximum Limit Setpoint pot
and Minimum Limit Setpoint pot. In the case of absolute
"occupied" and "standby" setpoints, the setpoint knob still
represents the mid-point of the ZEB, even when set to either
of these limits. The actual setpoints are given by the
equations shown above. When the setpoint knob is configured
to be "relative", the lowest actual "occupied" setpoint allowed
is equal to SptHeatOcc - SptKnobLowLim, and the highest
allowed is equal to SptCoolOcc + SptKnobHiLim. The lowest
and highest "standby" setpoints are found in an analogous
fashion.
Setpoint from Network
When the Excel 10 FCU Controller is not configured to be
hardwired to a wall module, nviSetPoint must be bound to
another node that provides a setpoint. When bound and when
a valid update is received, nviSetPoint is used with the
appropriate ZEB:
• ZEBoccupied = Cooling Occupied Septoint - Heating
Occupied Setpoint
• ZEBstandby = Cooling Standby Setpoint - Heating
Standby Setpoint
The "unoccupied" setpoint does not depend on nviSetPoint at
all.
Setpoint Offset
Third-party nodes may be bound to nviSetPtOffset to shift the
setpoint in the range of -18 to 18 DDF (-10 K to 10 K).
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Table 1. Example setpoint values based upon default configuration – "absolute middle" setpoint knob (°C)
occupancy
mode
"occupied" 23 21 2 21 22 20
"standby" 25 19 6 21 24 18
"unoccupied" 28 16 12 X 28 16
NOTES:
1. Sample value shown. Limited by default configuration settings to the range of 12...30°C.
2. Limited to the range of 10...35°C.
3. = setpoint knob + (ZEB/2)
4. = setpoint knob – (ZEB/2)
Table 2. Example setpoint values based upon default configuration - Relative setpoint knob (°C)
occupancy
mode
"occupied" 23 21 2 -2 21 19
"standby" 25 19 6 -2 23 17
"unoccupied" 28 16 12 X 28 16
NOTES:
1. Sample value shown. Limited by default configuration settings to the range of -5...+5°C.
2. Limited to the range of 10...35°C.
3. = configured cooling setpoint + setpoint knob
4. = configured heating setpoint + setpoint knob
configured
cooling setpoint
configured
cooling setpoint
configured
heating setpoint
configured
heating setpoint
ZEB
ZEB
setpoint
knob1
setpoint
knob1
effective cooling
setpoint
effective cooling
setpoint
2,3
2,3
effective heating
setpoint
effective heating
setpoint
2,4
2,4
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Bypass
Bypass Mode
When the Excel 10 FCU Controller is in the "unoccupied"
mode, the Excel 10 wall module's bypass push-button may be
used to force the Excel 10 FCU Controller into the "occupied"
mode. The Excel 10 FCU Controller can also be forced into
the "occupied" mode by means of a L
command (when nviManOccCmd is set to OC_BYPASS). The
controller will then remain in "bypass" mode until:
1. The bypass timer has timed out, or
2. The user again presses the Excel 10 wall module's
bypass push-button, thus cancelling the "bypass" mode,
or
3. The occupancy schedule (nviTodEvent) switches the
mode to "occupied".
4. nviManOccCmd is set to OC_NUL.
The Excel 10 wall module indicates the current bypass mode
status (see Excel 10 wall module literature for further
information).
Bypass Timer
When the "bypass" mode has been activated, the bypass
timer is set to BypTime (default of 180 minutes), at the end of
which the mode will revert to its original state (see Excel 10
wall module literature for further information).
Continuous "Unoccupied" Mode
The continuous "unoccupied" mode is entered when an Excel
10 wall module is configured to allow it and if:
• (in the case of the T7460) the bypass button is pressed for
four to seven seconds (until the LED blinks),
• (in the case of the T7560) the bypass button is pressed for
more than five seconds (until the flashing moon appears).
The Excel 10 FCU Controller can also be forced into the continuous "unoccupied" mode by means of a L
work command (when nviManOccCmd is set to
OC_UNOCCUPIED). The Excel 10 FCU Controller will then
remain in this mode indefinitely, or until the bypass button is
pressed to exit the mode or a network command is sent to
clear the mode.
Bypass Push-Button
Excel 10 FCU Controllers may be hardwired to an Excel 10
wall module equipped with a bypass push-button. The bypass
push-button has three possible configurations (see Table 17
for further information):
• NONE
• BYPASS_UNOCCUPIED
• BYPASS_ONLY
Override Priority
Excel 10 FCU Controllers can be configured to arbitrate
overrides coming from the bypass push-button and the
network. There are two possible configurations, having the
following meanings:
• LAST_WINS specifies that the last command received
from either the wall module or nviManOccCmd
determines the effective override state.
• NETWORK_WINS specifies that, regardless of the wall
module override state, the effective occupancy mode is
ONWORKS network
ONWORKS net-
determined by nviManOccCmd (provided it has not been
set to OC_NUL).
LED/LCD
LED Override
The wall module’s LED indicates that the FCU Controller is
being overridden by either the bypass button or the
L
ONWORKS network.
• LED ON ⇒ "override bypass"
• One flash per second ⇒ "override unoccupied"
• Two flashes per second ⇒ "override standby" or
"occupied"
• LED OFF ⇒ no override
• Four flashes per second ⇒ The controller is responding to
a L
ONWORKS network management wink command.
LED Occupancy
The wall module’s LED indicates the effective occupancy
mode.
• LED ON ⇒ effective "occupied" or effective "bypass"
• One flash per second ⇒ effective "standby"
• LED OFF ⇒ effective "unoccupied"
• Four flashes per second ⇒ The controller is responding to
a L
ONWORKS network management wink command.
LCD Display
This mode is used only for T7560 Wall Modules. The
occupancy mode is represented by the following symbols:
⇒ effective "occupied" or effective "bypass"
⇒ effective "standby"
⇒ effective "unoccupied"
⇒ Controller is OFF
and ⇒ Controller is OFF, frost protection is enabled.
Flashing symbols indicate the "override" mode:
⇒ override "occupied" or override "bypass"
⇒ override "standby"
⇒ override "unoccupied"
⇒ The controller is responding to a L
ONWORKS network
management wink command.
Energy-Saving Features
The "Standby" Mode
The digital input for reading input from an occupancy sensor
(usually a motion detector) provides the Excel 10 FCU Controller with a means to enter an energy-saving standby mode
whenever there are no people in the room. The "standby"
mode occurs when the scheduled occupancy mode is
"occupied" but the occupancy sensor indicates that the room
is nevertheless currently unoccupied. If no occupancy sensor
is directly connected to the Excel 10 FCU Controller, an
occupancy sensor from another node may be bound to the
network input nviSensorOCC. The Excel 10 FCU Controller
can also be forced into the "standby" mode by means of a
L
ONWORKS network command (when nviManOccCmd is set to
OC_STANDBY). When in the "standby" mode, the Excel 10
FCU Controller uses the "standby" setpoints configured for
the heating and the cooling modes.
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Window Sensor
The digital input for reading input from a window contact
provides the Excel 10 FCU Controller with a means to disable
its temperature control activities if someone has opened a
window or door in the room. If no window sensor is directly
connected to the Excel 10 FCU Controller, the sensor from
another node may be used by binding it to nviWindow. Frost
protection remains active. Normal temperature control
resumes when the window closes.
Demand Limit Control
When a high-electrical-demand signal is received from an
energy management system via the L
(nviDlcShed), the Excel 10 FCU Controller uses Demand
Limit Control Bump to shift the current setpoint (down for
heating and up for cooling) by the configured value to save
energy.
ONWORKS network
Optimum Start Gradients
There are two parameters, Cool Rec Ramp and Heat Rec
Ramp, which can be configured to cause the cooling and
heating setpoints respectively to ramp up to their occupied
settings from their unoccupied or standby settings prior to
scheduled occupancy. The Excel 10 FCU Controller uses the
configured rates to determine the optimum time to start
increasing the heating or cooling demand. See the following
figures. The configuration parameters are in K/hour.
Fig. 5. Optimum start - cooling
Fig. 4. Optimum start - heating
Occupancy Status
The occupancy status is determined based upon the following table. Manual override may come from nviManOccCmd or from
the bypass push-button.
Table 3. Effective occupancy mode arbitration
scheduled occupancy mode occupancy sensor status manual override status effective operating mode
"occupied" room occupied not assigned OC_OCCUPIED
"occupied" room not occupied not assigned OC_STANDBY
X X "occupied" OC_OCCUPIED
X X "unoccupied" OC_UNOCCUPIED
X X "standby" OC_STANDBY
"occupied" X "standby" OC_OCCUPIED
"standby" X not assigned OC_STANDBY
"standby" X "standby" OC_OCCUPIED
"unoccupied" X not assigned OC_UNOCCUPIED
"unoccupied" X "standby" OC_BYPASS
X=Don't care
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Safety Features
Frost Protection
If the room temperature falls below 46.4 °F (8 °C), the Excel
10 FCU Controller enables the heating circuit to ensure frost
protection and an alarm is issued. When the temperature
rises above 48.2 °F (9 °C) again, the heating circuit is turned
OFF again.
Smoke Control
The Excel 10 FCU Controller will respond to L
ONWORKS
network emergency commands by switching OFF
heating/cooling outputs and switching OFF the fan
(depressurize) or switching ON the fan at its highest speed
(pressurize). An alarm is issued for any emergency
commands
Fan Failure Protection
When configured with an airflow detector, the Excel 10 FCU
Controller protects equipment by switching OFF heating /
cooling outputs and issuing an alarm when the fan fails.
Fan Interlocks
The Excel 10 FCU Controller can be configured such that
heating and/or cooling outputs are never ON unless the fan is
running. A fan run-up time can be configured to turn ON the
fan prior to the heating/cooling outputs being switched ON,
and a fan overrun time can be configured to keep the fan
running for a period of time after the heating/cooling outputs
are switched OFF.
Operating Modes
The possible modes of operation are listed in Table 4.
Table 4. Modes of operation for Excel 10 FCU Controller
mode description events causing a transition to this mode
operational modes (NV reference)
START-UP AND
WAIT
Control algorithms are disabled. Outputs stay in
their initial positions. Physical inputs are periodically
read and digital filtering of analog inputs is turned
OFF to speed up settling time. Input NVs are
received and output NVs are sent periodically.
FLOATING
OUTPUTS SYNCH
The Excel 10 FCU Controller drives the floating
control valves to their initial positions and then
transitions to one of the control modes.
COOLING The Excel 10 FCU Controller is controlling in the
cooling mode.
HEATING The Excel 10 FCU Controller is controlling in the
heating mode.
MANUAL MODE The control algorithms stay active and outputs are
controlled automatically until set individually to test
positions using the input NV nviTest.
FACTORY TEST Control algorithm is disabled; a special factory test
program runs.
DISABLED Control algorithms are terminated, outputs are
turned OFF (turn-OFF sequences and interlocks are
active). Frost protection is disabled.
PRESSURIZE Heating/cooling outputs are switched OFF, and the
fan is switched ON at its highest speed.
DEPRESSURIZE Heating, cooling, and fan outputs are switched OFF. Network input nviEmerg containing smoke control
This is the first mode after an application restart.
When the effective occupancy changes to
"unoccupied" or "standby", after start-up, after 24
hours since the last positioning, or after each
positioning to 0%, the Excel 10 FCU Controller
transitions to this mode.
Network input nviApplicMode has a value of
HVAC_COOL or HVAC_AUTO and the space
temperature is above the cooling setpoint.
Network input nviApplicMode has the value of
HVAC_HEAT or HVAC_AUTO and the space
temperature is below the heating setpoint.
Network input nviManualMode has value of
MODE_MANUAL.
This mode is for factory testing, only.
Network input nviManualMode has a value of
MODE_DISABLED.
Network input nviEmerg containing smoke control
signal from the L
ONWORKS network has the value
of EMERG_PRESSURIZE.
signal from the L
ONWORKS network has the value
of EMERG_DEPRESSURIZE.
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Construction
EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Excel 10 W7752 FCU Controllers
The Excel 10 W7752 FCU Controller is available in five basic
models, each with two different possibilities for L
transceivers. All of these controllers are mains-powered, and
two models are equipped with an additional high-power relay
for applications with electric reheat. Table 5 shows the
differences between models.
Table 5. Excel 10 W7752 FCU Controller models
OS number power input reheat relay
W7752D2007 230 Vac X
W7752E2004 230 Vac
W7752F2002 115 Vac X
W7752G2000 115 Vac
W7752J2003 100 Vac
All wiring connections to the controllers are made at screw
terminal blocks accessible beneath a plastic safety cover.
Mounting dimensions are shown in Fig. 6 on page 10.
ONWORKS
Excel 10 W7754 FCU Controllers
The Excel 10 W7754 FCU Controller is available in five basic
models, each with two different possibilities for L
transceivers. Table 6 shows the differences between models.
Table 6. Excel 10 W7754 FCU Controller models
OS number power input reheat relay
W7754K1001 230 Vac
W7754L1009 24 Vac
W7754M1007 230 Vac
W7754N1004 230 Vac
W7754P1000 230 Vac X
All wiring connections to the controllers are made at screw
terminal blocks accessible beneath a plastic safety cover.
Mounting dimensions are shown in Fig. 7 on page 10.
ONWORKS
CAUTION
If Excel 10 FCU Controllers are mounted vertically and
thermal actuators are used, the transformer must not
be located below the electronics due to heating
effects.
WARNING
Electrical Shock Hazard.
Mains power at terminal block can cause personal
injury or death. Excel 10 FCU Controllers must be
mounted inside their fan coil unit boxes to prevent
access by unauthorized personnel.
To reduce the risk of fire or electric shock, install in a
controlled environment relatively free of contaminants.
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
5
Fig. 6. W7752 dimensions, in inches (mm)
59.
terminal protection
cover (optional)
UNUSED
WALL MOD.
+ -
RS1A
USED
23D25
ON
UNUSED
0345
DI2
USED
GND9LED10FAN11DI2
8
12
3
5 6 23
DI1
SET
53
T7460 / T7560
SENS
42 1
7
GND
230 V
21 4
LON
W7754Kxxxx
230 Vac, 50/60 Hz
max. 5 VA unloaded
131415 181716
L
N
2 A10A
III II I
fan
180
1920
open
close
OUT1 OUT2
230 Vac
Ho ne yw e l l
D-71101 Schönaich
Made in Germany
triac
0.5 A
2526
24
2122
com
com
open
close
230 V
110
2A/M
LN
130
90
Fig. 7. W7754 dimensions, in mm
EN2B-0285GE51 R0909
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Controller Performance Specifications
Power:
W7752D and W7752E; W7754K,M,N,P
230 Vac +10%, -15%, 50/60 Hz.
W7752F and W7752G
115 Vac +10%, -15%, 50/60 Hz.
W7752J
100 Vac ±6%, 50/60 Hz.
W7754L
24 Vac ±20%, 50/60 Hz.
Operating Temperature:
32...122°F (0...50°C).
Shipping/Storage Temperature:
-40...+158°F (-40...+70°C).
Relative Humidity:
5% to 95% non-condensing
Inputs:
Temperature Sensor:
20k ohm NTC
Setpoint Potentiometer:
10k ohm
Digital Input:
Closed ≤ 400 ohms
Open ≥ 10 K ohms
Outputs:
Triac voltage range:
24 Vac ± 20%.
Triac max. current ratings:
250 mA continuous
650 mA surge for 30 sec.
IMPORTANT:
When any device is energized by a triac, the device
must be able to sink a minimum of 15 mA. If nonHoneywell motors, actuators, or transducers are to
be used with Excel 10 FCU Controllers, compatibility
must be verified.
Fan relays voltage range:
20 to 253 Vac
Fan relays max. current rating:
3 A
Electric reheat relay voltage range:
20 to 253 Vac
Electric reheat relay max. current rating:
10 A
6 A (UL916)
Interoperability
The Excel 10 FCU Controllers use the LonTalk protocol. They
support the L
Controller”, version 2.0. Fig. 8 shows the implementation
used.
ONMARK Functional Profile # 8020 “Fan Coil Unit
nviSpaceTemp
nv1
SNVT_temp_p
nviSetPoint
nv2
SNVT_temp_p
nviFanSpeedCmd
nv6
SNVT_switch
nviOccCmd
nv7
SNVT_occupancy
nviApplicMode
nv8
SNVT_hvac_mode
nviSetPtOffset
nv9
SNVT_temp_p
nviWaterTemp
nv10
SNVT_temp_p
nviDischAirTemp
nv17
SNVT_temp_p
nviEnergyHoldOff
nv18
SNVT_switch
nviSensorOcc
SNVT_Occupancy
nviEmerg
SNVT_hvac_emerg
nviReheatRelay
SNVT_switch
NOT SUPPORTED.
Fig. 8. L
Hardware
Output
Fan Coil Unit Controller
Object #8020
nvoHeatOutput
nv3
SNVT_lev_percent
Mandatory
Network
Var ia ble s
Optional
Network
Var iable s
nvoCoolOutput
nv4
SNVT_lev_percent
nvoFanSpeed
nv5
SNVT_switch
nvoTerminalLoad
nv11
SNVT_lev_percent
nvoLoadAbs
nv12
SNVT_power
nvoDischAirTemp
nv13
SNVT_temp_p
nvoReheat
nv14
SNVT_switch
nvoSpaceTemp
nv15
SNVT_temp_p
nvoEffectSetPt
nv16
SNVT_temp_p
nvoEffectOcc
nv19
SNVT_occupancy
nvoEnergyHoldOff
nv20
SNVT_switch
nvoUnitStatus
nv21
SNVT_hvac_status
Configuration Properties
nc49 - nciSndHrtBt SNVT_time_sec mandatory
nc52 - nciMinOutTm SNVT_time_sec optional
nc48 - nciRcvHrtBt SNVT_time_sec optional
nc17 - nciLocation SNVT_str_asc optional
nc60 - nciSetPnts
nc59 - nciNumValve
SNVT_temp_setpt
SNVT_count
Manufacturer
Defined
mandatory
optional
nvoSensorOcc
SNVT_occupancy
Section
nvoDigitInState
SNVT_switch
Hardware
Input
ONMARK FCU object profile
EN2B-0285GE51 R0909
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Configurations
General
The following sections provide an overview of the Excel 10
FCU Controller options related to inputs and outputs. See
Application Step 6. Plug-Ins Configuration Screens for
complete list of configuration options and defaults.
Table 7. Hardware options summary
option possible configurations
fan type • no fan
• one-speed
• two-speed
• three-speed
fan interlock • enabled
• disabled
FCU system type • two-pipe
• four-pipe
output 1 actuator
type
output 2 actuator
type
valve direction • direct
reheat • none
digital input • not used
wall module option • local
temperature sensor
type
NOTE:
1
The floating-mid option is only for changeover applications
and uses only one of the two outputs.
• floating
• floating mid (one for heat/cool)
• one-stage
• two-stage
• three-stage
• PWM
• thermal
• floating
•
floating mid (one for heat/cool)
• one-stage
• two-stage
• three-stage
• PWM
• thermal
• reverse
• reheat (W7752D and F and
W7754P1000, only)
• free use (W7752D and F and
W7754P1000, only)
• window closed
• occupied sensor
• air flow detector
• cool changeover
• window open
• unoccupied sensor
• no air flow
• heat changeover
• movement
• no movement
• shared
• none
• NTC non-linearized
1
1
Fan Type
Each fan coil unit controlled by an Excel 10 FCU Controller
can have a fan with up to three different speeds or no fan at
all. Multi-speed fans are switched at the same switching levels
as multi-staged heating control points (see Fig. 9). For
example, a three-speed fan will switch ON its first speed at
the same control level as the first stage of heating or cooling
up until the second stage of heating or cooling where the
second fan speed will switch on. A two stage fan will switch
with the first two stages of a 3-stage heating or cooling
system. Likewise, a single speed fan will turn ON at the first
stage of any multi-staged system. Conversely, a multi-speed
fan may follow multiple switching levels even for singlestaged, floating, PWM, or thermal actuator-based systems.
Hysteresis
The hysteresis for fan speed extends to the next lower
switching level (or a control level of 0) as is shown in Fig. 9.
For example, the second fan speed will remain ON until the
control level falls below the switching point for the first fan
speed. Minimum ON/OFF times can be configured and will
apply to all fan switching points.
Interlock
A fan interlock can be configured which prevents heating or
cooling outputs from being turned ON in the event of a fan
failure (where an air flow detector is installed to detect fan
failure). When fan interlock is configured, run-up and overruntimes can be configured to delay switching ON the heating or
cooling equipment after switching ON the fan and delay
switching OFF the fan after the heating or cooling equipment
is switched OFF.
The fan can be configured to run continuously during the zero
energy band during occupied periods.
EN2B-0285GE51 R0909
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Fig. 9. Three-speed fan switching and hysteresis, cooling mode (defaults for switching levels shown)
Type of Heating and Cooling Equipment
Excel 10 FCU Controllers can operate with either two-pipe or
four-pipe systems. A two-pipe system requires a changeover
input to the controller (hardware or network input).
Excel 10 FCU Controllers can operate with a variety of
actuators for heating and cooling equipment. Floating
actuators can be used; this requires that the valve run time be
specified during configuration of the controller.
The actuator runtimes can be configured in the range 20 sec
to 600 sec in steps of 1 second.
Valves will be synchronized by driving the valve fully closed
(150% of the valve run time) under the following conditions:
• whenever the control level reaches 0% or less;
• at power-on;
• whenever the occupancy status changes to a lower mode,
e.g., from occupied to standby or unoccupied;
• when synchronization has not taken place within the last
24 hours.
Once synchronization has been completed, the output control
will be returned to the normal control loop.
Valve action can be configured as either direct or reverse.
When in a two-pipe system with a changeover input, a floating
actuator can be used which has the middle position (50%) as
the zero energy position. The cool range is then 0 to 50% and
the heat range 50 to 100%. The output must be configured as
floating-mid.
Multi-stage systems can be controlled with up to three
different stages of heating/cooling control. Switching levels
are specified in % of control level (see Fig. 10) as is a
hysteresis setting which applies to all switching levels.
Heating and cooling switching levels and hysteresis are
specified separately. Min. OFF times can be configured, and
for one-, two- and three-stage systems, a min. ON time can
also be configured.
PWM electronic valves and thermal actuators can also be
connected and can be configured as either direct or reverse
action. The cycle time must be specified during configuration.
In the case of PWM valves, the zero and full positions must
also be configured.
Additionally, the W7754K1001 features an extra socket
(located to the left of the terminal blocks) containing a digital
output suitable for connection to a solid-state relay employed
for low-voltage PWM control in high-current electric reheat
applications.
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Fig. 10. Three-stage heating/cooling switching (defaults for switching levels and hysteresis shown)
Reheat Output
W7752D and F Controllers and the W7754P1000 have an
additional high-current (10 A max.; UL916: 6 A max.) output
relay to control an electric reheater (refer to Fig. 2 for sample
application). The reheat output has its own switching level and
hysteresis settings (see Fig. 11). The reheat relay may also
be used as an auxiliary output for other purposes, in which
case the controller must be configured to specify that the
output is under network control instead of the FCU control
algorithm.
Fig. 11. Reheat switching and hysteresis (defaults
shown)
Digital Input
The Excel 10 W7752 FCU Controllers are equipped with a
single digital input which may be configured to accommodate
an occupancy sensor, a window open/closed contact, an air
flow detector (for fan failure detection), or a changeover input.
It is possible to configure this input for either normally-open or
normally-closed contacts for any of the switches.
The control algorithm in the Excel 10 FCU Controller uses the
occupancy sensor, if configured, to determine the effective
occupancy mode (see Table 3). If the Time Of Day (TOD)
schedule indicates an occupied state, and the eccupancy
sensor contact is closed, the effective occupancy mode will be
"occupied". However, if the TOD schedule indicates an
occupied state and if the occupancy sensor contact is open,
then the effective occupancy mode will be "standby". The
control algorithm will then control according to the "standby"
setpoints configured for the heating and the cooling modes.
Configuring the digital input for movement or no movement
(dependent upon normally-open or normally-closed contacts)
adds a delay of 15 minutes to the occupancy sensor such that
the space is considered occupied until 15 minutes has
elapsed since the last movement is detected.
If the digital input is configured to read input from a window
open/closed contact, heating, cooling, and fan control will be
disabled while the window is detected open. Frost protection
will be enabled. A set of contacts may be wired in series for
multiple windows. If the window open/closed contact is not
configured, a one-to-one association (binding) of the window
sensor from another controller on the L
be made. A locally-wired contact can also be used in
combination with the network input, the result being a logical
OR of the inputs.
If the digital input is configured to read input from an air flow
detector (fan status), heating and cooling control will be
disabled for a fan failure (fan ON and no air flow detected).
The input may also be configured for changeover for a twopipe system.
The Excel 10 W7754 FCU Controllers are equipped with a
second digital input which is permanently assigned (i.e. not
configurable using the plug-in) to the window contact function.
ONWORKS network can
EN2B-0285GE51 R0909
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Excel 10 Wall Module Options
A typical FCU installation will include an Excel 10 wall module
containing a 20k ohm NTC room temperature sensor and
additional features depending on the wall module type (see
Excel 10 wall module literature for further information).
Excel 10 FCU Controllers can use a return air sensor rather
than the sensor in the wall module if it is wired to the wall
module sensor input. Setpoint adjustments can be configured
as relative or absolute, and upper and lower limits can be set.
A configuration option for the fan speed switch allows it to be
disabled if not required. The bypass button can be configured
to override the control mode to "occupied" for a configurable
bypass time and to override the control mode to "unoccupied"
for an indefinite time, or it may be configured to only override
to "occupied". The button may also be used to cancel the
override.
Common Temperature Control (Master/Slave Controllers)
When one or more Excel 10 FCU Controllers serve a
common area and a single temperature sensor is to be used,
a master/slave arrangement can be configured. One Excel 10
FCU Controller is configured for the local wall module with the
desired options. The other Excel 10 FCU Controller(s) will be
configured without wall modules and with certain network
variables bound with the master controller. Refer to
Application Step 6 of this document for more details.
IMPORTANT
The slave units must have the same HVAC
equipment connected to it as the master units.
The slave units will not use any internal temperature
setpoints or control algorithms. The master controller
determines heating/cooling output based upon
setpoints and occupancy and L
ONWORKS network
command mode status and communicates this to the
slave via the L
ONWORKS network.
EN2B-0285GE51 R0909
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Abbreviations and Definitions
CARE Computer Aided Regulation Engineering;
the PC based tool used to configure
LonWorks devices.
CPU Central Processing Unit; an EXCEL 5000
System controller module.
Echelon
®
The company that developed the
L
ONWORKS
®
network and the Neuron® chips
used to communicate on it.
EMI Electromagnetic Interference; electrical
noise that can cause problems with
communications signals.
EMS Energy Management System; refers to the
controllers and algorithms responsible for
calculating optimum operational parameters
for max. energy savings in the building.
EEPROM Electrically Erasable Programmable Read
Only Memory; the variable storage area for
saving user setpoint values and factory
calibration information.
EPROM Erasable Programmable Read Only
Memory; the firmware that contains the
control algorithms for the Excel 10 FCU
Controller.
Firmware Software stored in a nonvolatile memory
medium such as an EPROM.
I/O Input/Output; the physical sensors and
actuators connected to a controller.
I x R I times R or current times resistance; refers
to Ohms Law: V = I x R.
K Kelvin.
®
L
ONWORKS Echelon® LONWORKS® network for
communication among Excel 10 FCU
Controllers.
NEC National Electrical Code; the body of
standards for safe field-wiring practices.
NEMA National Electrical Manufacturers
Association; the standards developed by an
organization of companies for safe field
wiring practices.
NV Network Variable; an Excel 10 FCU
Controller parameter that can be viewed or
modified over the L
ONWORKS network.
OEM Original Equipment Manufacturer; the
company that builds the fan coil units.
PC Personal Computer.
Pot Potentiometer. A variable resistance
electronic component located on Excel 10
wall modules. Used to allow user-adjusted
Setpoints to be inputted into the Excel 10
FCU Controller.
segment A L
ONWORKS section containing no more
than 60 Excel 10s. Two segments can be
joined together using a router.
Subnet An L
ONWORKS segment that is separated by
a router from its Q7750A Zone Manager.
TOD Time-Of-Day; the scheduling of Occupied
and Unoccupied times of operation.
VA Volt Amperes; a measure of electrical power
output or consumption as applicable to an
ac device.
Vac Voltage alternating current; ac voltage as
opposed to dc voltage.
EN2B-0285GE51 R0909
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
APPLICATION STEPS
Overview
Steps one through seven (see Table 8) address considerations for engineering an Excel 10 FCU System. These
steps are guidelines intended to aid understanding of the product I/O options, bus arrangement choices, configuration
options and the Excel 10 FCU Controllers’ role in the overall
EXCEL 5000
Step No. Description
Step 1. Plan the System
Plan the use of the FCU Controllers according to the job
requirements. Determine the location, functionality and sensor
or actuator usage. Verify the sales estimate of the number of
FCU Controllers and wall modules required for each model
type. Also check the number and type of output actuators and
other accessories required.
When planning the system layout, consider potential expansion possibilities to allow for future growth. Planning is
very important to be prepared for adding HVAC systems and
controllers in future projects.
using an LNS tool
Fig. 12. Connecting the portable operator terminal to the
The L
be laid out according to the guidelines applicable for that
topology. FCU Controllers use FTT technology which allows
daisy chain, star, loop or combinations of these bus
configurations. See section "Step 3. Lay Out Communications
and Power Wiring" (page 18) for more information on bus
wiring layout, and see Fig. 13, Fig. 14, and Fig. 15 in section
"Step 4. Prepare Wiring Diagrams" (page 19) for wiring
details.
It is important to understand the interrelationships between
FCU Controllers on the L
®
System architecture.
Table 8. Application steps
1 Plan the System
2 Determine Other Bus Devices Required
3 Lay Out Communication and Power Wiring
4 Prepare Wiring Diagrams
5 Order Equipment
6 Configure Controllers
7 Troubleshooting
notebook PC
shielded
interface
cable
Excel 10
FCU
RS-232
serial
port
L
ONWORKS network
ONWORKS communication loop between controllers must
ONWORKS network early in the job
SLTA
controller
LonWorks
port
engineering process to ensure their implementation when
configuring the controllers. (See section "Step 6. Configure
Controllers" [page 25] for information on the various Excel 10
FCU Controller parameters and on Excel 10 FCU Controller
point mapping.)
Step 2. Determine Other Bus Devices
Required
A max. of 62 nodes can communicate on a single LONWORKS
segment. If more nodes are required, a router is necessary.
Using a router allows up to 125 nodes, divided between two
L
ONWORKS segments. The router accounts for two of these
nodes (one node on each side of the router). Table 9
summarizes the L
Table 9. LonWorks configuration rules and number of
One LONWORKS Segment
(Example)
Max. no. of Excel 10
Two LONWORKS Segments
(Example)
Max. no. of Excel 10
Controllers in segment
Max. no. of Excel 10
Controllers in segment
The max. length of an FTT L
(1400 m) for a daisy chain configuration or 1650 ft (500 m)
total wire length and (400 m) node-to-node for any other type
of configuration.
NOTE: In the case of FTT L
distance from each transceiver to all other transceivers and to the termination must not exceed the
max. node-to-node distance. If multiple paths exist,
the longest one should be used for the calculation.
If longer runs are required, add a router in order to partition
the system into two segments.
In addition, all L
a Bus Termination Module. For an FTT L
one or two Termination Modules may be required depending
upon the bus configuration. See section "Step 3. Lay Out
Communications and Power Wiring" (page 18) and the
L
ONWORKS Termination Module subsection in section "Step 4.
Prepare Wiring Diagrams" (page 19) for more details.
ONWORKS segment configuration rules.
device nodes
Max. No. of Nodes = 62
60 nodes (T7460/T7560 wall
Controllers
modules are not L
nodes)
Total 62 nodes
Max. No. of Nodes = 125
60 nodes (T7460/T7560 wall
modules are not L
number one
nodes)
60 nodes (T7460/T7560 wall
modules are not L
number two
nodes)
Total 125 nodes
ONWORKS segment is 4600 ft
ONWORKS segments, the
ONWORKS segments require the installation of
ONWORKS segment,
ONWORKS
ONWORKS
ONWORKS
EN2B-0285GE51 R0909
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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Step 3. Lay Out Communications and Power
Wiring
LONWORKS Layout
The communications bus, LONWORKS, is a 78-kilobit serial link
that uses transformer isolation and differential Manchester
encoding. Wire the L
set forth in Table 10. An FTT L
daisy chain, star, loop or any combination thereof as long as
the max. wire length requirements given in Step 2 are met.
Excel 5000
Excel 5000
ONWORKS using wires with specifications
ONWORKS can be wired in
Excel 10 W7754
FCU Controller
Hone ywel l
D-71101 Schönaich
Made in Germany
12
Fig. 13. L
ONWORKS wiring layout for one daisy-chain network segment
Excel 10 W7754
FCU Controller
NOTE: Due to the transformer isolation, the bus wiring does
not have a polarity; that is, it is not important which
of the two L
ONWORKS terminals are connected to
each wire of the twisted pair.
L
ONWORKS networks can be configured in a variety of ways,
but the rules listed in Table 9 always apply. Fig. 13 and Fig.
14 depict two typical daisy chain L
ONWORKS network layouts;
one as a single bus segment that has 60 nodes or less, and
one showing two segments. Fig. 15 shows examples of free
topology bus layouts. The bus configuration is set up using
the Network Manager tool.
Excel 10 W7752
FCU Controller
Hone ywe l l
10 11 129
module
termination
Excel 10 W7752
FCU Controller
10
9
Hone ywe l l
11 12
Hone ywel l
D-71101 Schönaich
Made in Germany
12
max. 60 nodes
Excel 10 W7752
FCU Controller
Ho ne ywe ll
10 11 129
LonWorks
router
module
termination
module
termination
module
termination
Excel 10 W7754
FCU Controller
Hone ywe ll
D-71101 Schönaich
Made in Germany
12
max. 60 nodes
Fig. 14. L
ONWORKS wiring layout for two daisy-chain network segments
EN2B-0285GE51 R0909
18
EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
NOTE: See section "L
additional details.
IMPORTANT
Notes on Communications Wiring:
• All field wiring must conform to local codes and
ordinances.
• Do not use different wire types or gauges on the
same L
ONWORKS segment. The step change in
line impedance characteristics would cause
unpredictable reflections on the L
work. When using different types is unavoidable,
use a Q7751A Router at the junction.
• Do not use shielded cable for L
runs. The higher capacitance of the shielded
cable will cause degradation of communications
throughput. In noisy (high EMI) environments,
avoid wire runs parallel to noisy power cables, or
lines containing lighting dimmer switches, and
keep at least 3 in. (76 mm) of separation between
noisy lines and the L
• Make sure that neither of the L
grounded.
Power Wiring
IMPORTANT
Notes on Power Wiring:
Fig. 15. Free topology L
ONWORKS Termination" on page 23 for
ONWORKS net-
ONWORKS wiring
ONWORKS cable.
ONWORKS wires is
ONWORKS layout examples
• All field wiring must conform to local codes and
ordinances.
• See Table 10 for permitted wire sizes.
• To minimize EMI noise, do not run Triac and/or
relay output wires in the same conduit as the
input wires or the L
ONWORKS communications
loop.
• To comply with CE requirements, in the case of
devices having a voltage range of 50 to 1000 Vac
or 75 and 1500 Vdc which are not provided with a
supply cord and a plug or with other means for
disconnection from the supply having a contact
separation of at least 3 mm in all poles, the
means for disconnection must be incorporated in
the fixed wiring.
Step 4. Prepare Wiring Diagrams
General Considerations
The purpose of this step is to assist the application engineer
in developing job drawings to meet job specifications.
NOTE: For field wiring, when two or more wires are to be
attached to the same connector block terminal, be
sure to twist them together. Deviation from this rule
can result in improper electrical contact.
Table 10 lists wiring types, sizes, and length restrictions for
Excel 10 FCU Controller products.
EN2B-0285GE51 R0909
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