Ebmpapst CN1116 Manual

Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
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Part No
CN1116
Description
Modbus Display & Control (MDC)
Issue
Date
Author
Comments
8.1
05/10/2021
F. Pagliarini
To be used with MDC Iss8
Corrected HREG Read Command on Page 32

Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
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Table of Contents
1.0 Safety Notice.............................................................................................................................................. 5
2.0 Introduction................................................................................................................................................. 6
3.0 Overview .................................................................................................................................................... 7
3.1 Specification.................................................................................................................................................. 7
3.2 Installation..................................................................................................................................................... 7
3.3 Hot plugging.................................................................................................................................................. 7
3.4 RS485 wiring installation............................................................................................................................... 7
4.0 Configuration and First Use............................................................................................................................... 8
4.1 Electrical connections ................................................................................................................................... 8
4.2 General and initial power ON........................................................................................................................ 8
4.3 First time controller configuration .................................................................................................................. 9
4.3.1 Configuring the controller with fans that are in their factory default settings.......................................... 9
4.3.2 Configuring the controller with fans that have been pre-configured by another MDC.......................... 10
4.4 Fan status screen........................................................................................................................................ 11
4.5 Power meter and summary screen ............................................................................................................. 11
4.6 Swapping fan numbers and addresses....................................................................................................... 12
5.0 Operating Modes...................................................................................................................................... 12
5.1 General ....................................................................................................................................................... 12
5.2 Main menu access and operating mode configuration................................................................................ 13
5.3 Monitor mode (default operation)................................................................................................................ 13
5.4 Monitor & control mode............................................................................................................................... 14
5.4.1 Controlling the fan array speed using the controller’s 0-10V input (0-10V Control Mode) ................... 14
5.4.2 Controlling the fan array speed using the controller’s RS485 Slave port (Modbus Control Mode) ...... 15
5.4.3 Controlling the fan array speed using the controller’s keypad (Keypad Control Mode) ....................... 16
5.4.4 Measuring fan performance using one or multiple pressure sensors .................................................. 16
5.5 Constant volume or constant pressure operating mode.............................................................................. 17
5.6 Modbus relay operating mode..................................................................................................................... 18
6.0 Pressure Sensor Connections.................................................................................................................. 18
7.0 Advanced Settings ................................................................................................................................... 19
8.0 Multi-Sensor Operation ............................................................................................................................ 22
8.1 Sensor wiring and airline connections......................................................................................................... 22
8.2 Controller configuration and automatic sensor mapping ............................................................................. 23
8.3 Reading the volume from individual sensors (direct and shared sensors) .................................................. 25
9.0 Fault Indication......................................................................................................................................... 25
9.1 Loss of communication and fan alarms indications..................................................................................... 25
9.2 Warning indications..................................................................................................................................... 26
9.3 Sensor Failures........................................................................................................................................... 26
10.0 Replacing the Controller........................................................................................................................... 27
11.0 Replacing a Fan ....................................................................................................................................... 27
12.0 WEEE (Waste Electrical and Electronic Equipment)................................................................................ 28
13.0 End of life ................................................................................................................................................. 28

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14.0 Take Back Policy...................................................................................................................................... 28
15.0 Transport & Storage................................................................................................................................. 28
16.0 Maintenance and servicing....................................................................................................................... 28
17.0 UKCA / CE Certificates ............................................................................................................................ 28
Appendix A –Physical Details............................................................................................................................... 29
Appendix B –Electrical Connections..................................................................................................................... 30
Appendix C –Remote Monitoring & Control.......................................................................................................... 31
C.1 Remote Monitoring ..................................................................................................................................... 31
C.2 Remote Fan Array Control.......................................................................................................................... 31
C.3 Remote Speed Control –Individual Fans................................................................................................... 32
Appendix D –Modbus Input Registers .................................................................................................................. 32
Appendix E –Modbus Holding Registers for Configuration & Control................................................................... 33
Appendix F –Modbus Holding Registers for Individual Fan Monitoring ................................................................ 37
Appendix G –Example of Modbus Relay Operation ............................................................................................. 39
Appendix H –Menu Structure Flow Chart ............................................................................................................. 41
H1 –Fan Addressing - New Fan Array -Initial Setup ........................................................................................ 41
H2 –Fan Addressing - Existing Fan Array - Initial Setup.................................................................................. 41
H3 –Initial Factory Reset.................................................................................................................................. 41
H4 –Fan Replacement ..................................................................................................................................... 41
H5 –Main Menu................................................................................................................................................ 41
H6 –Fan Status ................................................................................................................................................ 42
H7 –Operation Mode –Monitor........................................................................................................................ 42
H8 –Operation Mode - Monitor & Control......................................................................................................... 42
H9 –Operation Mode - Monitor & Control –Keypad Control ............................................................................ 43
H10 –Operation Mode - Constant Volume / Constant Pressure ...................................................................... 43
H11 –Operation Mode - Modbus Relay............................................................................................................ 43
H12 –Advanced Settings Sub Menu ................................................................................................................ 44
H13 –Adv. Settings - Sensor Reading H14 –Adv. Settings –Measurement Unit .................................. 44
H15 –Advanced Settings –PID Settings.......................................................................................................... 44
H16 –Advanced Settings –RPM Limit ............................................................................................................. 44
H17 –Adv. Settings –0-10V Control Cap H18 –Adv. Settings –0-10V Input Cap................................... 45
.......................................................................................................................................................................... 45
H19 –Advanced Settings –Alarm Output......................................................................................................... 45
H20 –Advanced Settings –BMS Settings........................................................................................................ 45
H21 –Advanced Settings –BMS Compatibility ................................................................................................ 46
H22 –Advanced Settings –Main Menu Lock ................................................................................................... 46
H23 –Diagnostics Menu................................................................................................................................... 46
H24 –Fan Comms............................................................................................................................................ 46
H25 –Adv. Settings –LCD Brightness H26 –Adv. Settings –Erase Sensor Map............................... 47
H27 –Advanced Settings –Factory Reset ....................................................................................................... 47

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Table of Figures
Figure 1 - Schematic of RS485 installation.............................................................................................................. 7
Figure 2 –Typical wiring for Monitor Operating mode............................................................................................. 8
Figure 3 - Fan status screen showing that the controller had a previously stored fan array.................................... 8
Figure 4 - Keypad buttons ....................................................................................................................................... 9
Figure 5 - Main menu display screen on first application of power.......................................................................... 9
Figure 6 - Fan status screen.................................................................................................................................. 11
Figure 7 –Power meter and Summary Screen ..................................................................................................... 11
Figure 8 - Wiring diagram for Monitor operating mode –with optional pressure sensor ....................................... 13
Figure 9 - Wiring diagram for Monitor & Control operating mode and 0-10V control mode –potentiometer control
signal and 10V supply from fans ........................................................................................................................... 15
Figure 10 - Wiring diagram for Monitor & Control operating mode and 0-10V control mode –potentiometer control
signal and external power supply .......................................................................................................................... 15
Figure 11 - Wiring diagram for Monitor & Control operating mode and 0-10V control mode –external control
signal..................................................................................................................................................................... 15
Figure 12 - Wiring diagram for Monitor & Control operating mode - Modbus RS485 control signal ...................... 16
Figure 13 - Wiring diagram for Monitor & Control operating mode –keypad control............................................. 16
Figure 14 - Wiring diagram for Monitor & Control operating mode –single sensor monitoring ............................. 17
Figure 15 - Typical wiring diagram for Constant volume / Constant pressure operating mode and controller sensor
input....................................................................................................................................................................... 18
Figure 16 –Sensor airline connections for pressure and volume.......................................................................... 19
Figure 17 –Airline length for a single sensor constant volume system or volume monitoring system .................. 19
Figure 18 –Sensor-Fan wiring diagram with power supply................................................................................... 22
Figure 19 –Simplified sensor-fan wiring using ebm-papst differential pressure sensors...................................... 22
Figure 20 –Example of sensor airline connections in a 4-fan 2-sensors constant volume system....................... 23
Figure 21 –Example of airline connections in a 4-fan 2-sensor constant pressure system.................................. 23
Figure 22 –Fan status screen showing individual sensor readings in m3/h.......................................................... 25
Figure 23 - Communication Lost Figure 24 - Fan Alarm .............................................................................. 26
Figure 25 - Example of a first warning on a fan Figure 26 - Example of a second warning on a fan................ 26
Figure 27 –Sensor Fail Alarm Indication .............................................................................................................. 27
Figure 28 –Exploded View of Product .................................................................................................................. 28
Table of Tables
Table 1 - Information shown on the MDC................................................................................................................ 6
Table 2 - Specification............................................................................................................................................. 7
Table 3 –Supported Fan Modbus Port Configuration ........................................................................................... 10
Table 4 –PCB Bottom Side Connector Identities and Pin Functions .................................................................... 30
Table 5 –PCB Top Side Connector and Pin Function .......................................................................................... 30
Table 6 - Modbus Input Registers ......................................................................................................................... 32
Table 7 –Controller’s Dedicated Modbus Holding Registers Part 1...................................................................... 33
Table 8 –Controller’s Dedicated Modbus Holding Registers Part 2...................................................................... 37
Table 9 –Fan Alarm and Fan Warning Register Breakdown ................................................................................ 38
Table 10 –Full Modbus Relay Register Map (retrieved from fan registers) .......................................................... 40

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Important
To assure proper usage, we ask you to read these operating instructions
carefully before installation and commissioning of the control device
NOTE: The table below identifies the features compatible with your controller’s firmware issue number. This
is shown on the LCD screen during power up and on the label at the back of the printed circuit board.
Firmware Issue
Notes
8
As per this OMI release
7 and below
See previously released OMIs
NOTE:
If the controller’s RS485 Slave port is being used, and the system has been designed using a controller whose
firmware issue is 6 or below, please activate the “BMS Compatibility” option according to the firmware issue of the
previous controller. See H21 –Advanced Settings –BMS Compatibility for more details.
Please note that the “BMS Compatibility” option is only available after initial configuration.
1.0 Safety Notice
CAUTION –Safety
•The Modbus Display & Control is only suitable for a safety extra low voltage supply of 9VDC up to 57VDC
CAUTION –Electro-Static Discharge
•Many modern electronic components are susceptible to damage from Electro-Static Discharge (Static
Electricity). During programming and commissioning, avoid unnecessary contact with electronic
components on PCB’s. PCB’s are sensitive to static discharges so should be stored and transported in
anti-static packaging until they are required to be used.
Warning –Do not operate in an explosive atmosphere
Warning –The fans may start during connection and programming. If there is a residual risk of
contact with a fan, then contact shall be prevented by suitable control methods to prevent accidental
contact

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2.0 Introduction
The Modbus Display & Control (MDC) is a device with two RS485 ports, a keypad for setting parameters and a
display to view the status of the connected equipment. The RS485 master port communicates with ebm-papst
Modbus enabled,Electronically Commutated (EC) fans with software version 5.0 or later using a two-wire plus
ground RS485 connection. The RS485 slave port communicates with an external Modbus Master device e.g.
Building Management System (BMS) and provide real-time monitoring and control data.
The MDC features a Modbus auto-addressing program to ease installation and commissioning where it
automatically searches and addresses up to 100 EC fans connected to its RS485 master port.
Four different operating modes are supported:
•Monitor:
oMonitors pre-defined fan parameters and reports the information via the digital display and the
RS485 slave port (see Tables 1 below).
oA fault condition is raised by an on-board LED and a volt-free relay.
oAn optional 0-10V differential pressure sensor can provide a signal to the controller to display
either differential pressure or used to calculate and display volume flow.
•Monitor & Control:
oAs per Monitor operating mode plus the fan speed is controlled by one, or a combination of:
▪An external 0-10V control signal connected to the controller’s 0-10V input.
▪A third-party Modbus Master device connected to the controller’s RS485 slave port.
▪Local control using the controller’s keypad.
•Constant Volume / Constant Pressure:
oAs per Monitor operating mode but requires one or multiple 0-10V differential pressure sensors
used by the controller to maintain a constant volume / constant pressure setpoint configured via
the keypad and/or the RS485 slave port.
•Modbus Relay:
oThis operating mode converts the controller into a simple messenger where it relays all Modbus
information received from the RS485 slave port to the master port, enabling individual fan control
and access to all Modbus Registers of each fan.
The MDC will display the following parameters for each connected fan, and the following system parameters:
Fan Actual Speed (RPM)
Fan Set Point (%)
Fan Serial Number
Fan Motor Temperature (oC) *1
Fan Electronics Temperature (oC)
Fan Hours Run (h)
Fan Power Consumption (W)
Fan Warnings
Fan Alarms
Fan Air Volume (m3/h or CFM) or Fan
Air Pressure (Pa or in.w.g) *2
System Power Consumption (kW)
Total System Volume (m3/h or
CFM) or Total System Pressure
(Pa or in.w.g) *2
Table 1 - Information shown on the MDC
Note *1-The controller is compatible with all firmware versions of ebm-papst enabled Modbus EC fans version
5.0 and later, however, on ‘Modbus LITE’ reduced functionality fans, the parameter ‘Motor Temperature’ is not
available.
Note *2- Volume and pressure measurements require one or more external differential pressure sensors with
a 0-10V output. The supported pressure ranges are 50Pa, 200Pa, 500Pa, 1000Pa, 2000Pa and 3500Pa.

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3.0 Overview
3.1 Specification
Product
Modbus Display & Control - CN1116
Supply Voltage
(Reverse Polarity Protected)
Two sets of connections are provided for either:
•9 VDC to 57VDC from an optional external PSU or
•10 VDC sourced from connection to at least two EC fans 10V
reference outputs* in parallel. Note that fans’ reference must be the
>=10 mA version.
Supply Current
10mA (low LDC backlight) –40mA (full LCD backlight)
Enclosure
CN1116 –wall mount
Enclosure Dimensions
See Appendix A –Physical Details
Weight
204 g
Operating Environment
-20°C to +60°C, 90%RH at 40°C max.
LCD Backlight Lifespan
Typ. 50000 hours of continuous operation at full backlight
EMC Compliance
BS EN61000-6-3 (emissions)
BS EN61000-6-2 (immunity)
* Patent GB 2 431 303
Table 2 - Specification
3.2 Installation
Avoid exposure to vibration, high temperatures. The unit shall be installed according to relevant safety guidelines
and requirements. Attention should be paid to local regulations and guidance.
3.3 Hot plugging
Hot plugging the controller is permissible, however, if a new or replacement controller is not at factory default
settings, it will need to be reset to such.
3.4 RS485 wiring installation
For reliable communication with the fans, it is recommended to use shielded twisted pair cable with 120Ω
impedance (RS485 standard cable), in a “Daisy Chain” wiring layout, and run it separated from mains supply wiring.
We recommend placing the controller at one end of the RS485 network and to add a 220Ω termination resistor at
the other end of the network cable as shown below:
Figure 1 - Schematic of RS485 installation
In case the controller is in the middle of the network, the built-in termination resistor must be taken out of the
circuit by removing the jumper bar located on back of the PCB. If that is the case, two resistors of the same value
must be added at each end of the network.
220Ω

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4.0 Configuration and First Use
4.1 Electrical connections
The electrical connections are shown in Appendix B –Electrical Connections. The required connections to the
controller depend on the intended use, i.e. the intended operating mode, and the desired configuration of fans,
sensors, inputs and outputs.
A suggested connection diagram for each operating mode and their different configurations is shown in Section
5.0 Operating Modes. For the purpose of explaining the initial configuration and first use of the controller, the
connection diagram for the controller’s factory default operating mode of “Monitor” is show in Figure 2 below:
Figure 2 –Typical wiring for Monitor Operating mode
CAUTION: Risk of damaging the fans if two power supplies are connected at the same time:
Do not connect fans’ 10V output to the controller if the controller is powered from an external power
supply.
4.2 General and initial power ON
When power is applied, the controller interrogates the on-board memory for a previously stored fan array and
configuration parameters. If there is a previously stored fan array, the controller will display the status screen of the
first fan in the array as shown in Figure 3 below. If there is no previously stored fan array the controller will display
the Factory Default Main Menu screen where setup is required, see 4.3 First time controller configuration.
Figure 3 - Fan status screen showing that the controller had a previously stored fan array
The controller has three status indicator LEDs, an LCD text screen, and a keypad interface to navigate around the
configuration menus and fan information.
LCD Text Display Screen
Keypad
Status Indicator
LEDs

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Figure 4 - Keypad buttons
•The FORWARD / ENTER button moves forward to the next fan if monitoring a fan’s status screen or
confirms the request / change of a set value when configuring parameters inside the menus.
•The UP and DOWN buttons navigate through fan parameters when monitoring a fan’s status screen or
changes the setpoints inside the menus.
•The BACK button moves back one step in the software structure without saving any changes made.
The menu structure flow chart is shown in Appendix H –Menu Structure Flow Chart.
Once the controller is configured and about to start normal operation, the green LED status indicator will be switched
on and the controller will display the real time operating condition of the fans. It is possible to scroll through the
network of connected fans to check set points, power consumption, alarm conditions and fan warnings from each
fan by using the keypad interface.
When a fan enters an alarm state or has lost communication with the controller, the red LED status indicator will
switch on and the display will show the fan that is experiencing the alarm as well as the details about that alarm.
If another fan in the array enters an alarm state, the controller will automatically display that fan’s alarm screen in
order to always display the most recent fan experiencing a fault.
If a warning condition has been detected in any fan, the controller will illuminate the yellow fan status indicator LED
but the display will not automatically show which fan has raised the warning. Fans that have entered a warning
condition status can be found by navigating through the network of connected fans using the keypad buttons or by
processing the controller’s Modbus registers using an external Modbus Master device connected to the controller’s
RS485 Slave port.
4.3 First time controller configuration
The controller can be used on a new installation with fans delivered in their factory default condition or be used on
an existing array of fans which have been networked and pre-addressed by another MDC. If the controller is used
in a fan array previously configured by another device, in most cases it is only required to use the controller’s
“Factory Reset” option before configuring the controller and fans.
4.3.1 Configuring the controller with fans that are in their factory default settings
New fans are typically supplied with factory default Modbus address 1 and factory default Modbus Port
Configuration of 19200 baud rate, even parity and 1 stop bit. New controllers are supplied without any stored fan
array configurations and on first application of power to the controller, the Main Menu will be displayed as shown in
Figure 5 below:
Figure 5 - Main menu display screen on first application of power
For the controller to locate and address the fans in the network, all fans must be factory default Modbus Address 1
and with one of the supported Modbus Port Configuration shown in Table 3 below:
FORWARD / ENTER button
UP button
BACK button
DOWN button

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19200 Even 1 Stop Bit (default)
19200 Odd 1 Stop Bit
19200 None (1 or 2 Stop Bits)
9600 Even 1 Stop Bit
9600 Odd 1 Stop Bit
9600 None (1 or 2 Stop Bits)
Table 3 –Supported Fan Modbus Port Configuration
Please note that the Modbus Port Configuration must be the same across all fans in the network.
Important: Modbus Port Configurations that are not supported might still work because of the fan’s
“Emergency Function” feature. However, this is not guaranteed, and it is not recommended to leave the system
running with fans at their Emergency Function state. A manual change of each fan’s Modbus Port Configuration is
strongly recommended using a combination of external devices such as a PC/laptop plus USB to RS485
converter and EC Control software
For fans that are not at their default Modbus Address 1, the controller is able to reset all connected fans to that
address using the “Factory Reset” option. Once that has been completed, please follow the steps below to address
the fans and start monitoring and/or controlling them:
•Select ‘Fan Addressing’ followed by ‘New Fan Array’ followed by the FORWARD button. See H1 –Fan
Addressing - New Fan Array -Initial Setup.
•If three or more fans are connected to the controller, we recommend using the “Autodetect” configuration
where the controller automatically detects the total number of fans in the network. It is possible to manually
enter the total number of fans using the UP and DOWN buttons, and then press the ENTER button twice
to confirm.
•If only two or one fan is connected to the controller please manually enter the number using the UP and
DOWN buttons and then press the ENTER button twice to confirm.
The fan addressing is performed in ascending order, where fans with the lowest serial number have the lowest
Modbus Address and Fan Number assigned by the controller. The first assigned Modbus Address to a fan is always
2. See an example below of a fan array consisting of 3 fans:
Fan Z has Serial Number 1327006PDZ –Controller Assigns Modbus Address 2 –this is FAN 1.
Fan X has Serial Number 1527006PDS –Controller Assigns Modbus Address 3 –this is FAN 2.
Fan Y has Serial Number 1527006PDZ –Controller Assigns Modbus Address 4 –this is FAN 3.
Important
After the fans have been automatically addressed it is possible to manually swap fan numbers between fans
using the “Fan Re-Addressing” option inside “Main Menu”. See 4.6 Swapping fan numbers and addresses
The auto addressing option will not be shown after all fans have been addressed. This can be reversed using the
“Factory Reset” option inside “Main Menu -> Advanced Settings”
In case of an error during auto addressing, the fans must be physically inspected to ensure they are correctly
wired and switched ON before retrying. It is also recommended, in all cases, to reset the controller and fans to
factory settings before retrying.
4.3.2 Configuring the controller with fans that have been pre-configured by another MDC
Select “Fan Addressing” followed by “Existing Fan Array”. The controller will verify and display how many fans it
has detected, and then ask for confirmation. If the number of fans detected is correct, press the ENTER button
twice to confirm. If the number of fans detected is wrong, please manually inspect the fans and wiring and then
retry.

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4.4 Fan status screen
When the controller has finished addressing all fans in the array, the new fan array is saved in the controller’s non-
volatile memory. For a large group of fans this may take some time as the controller must interrogate each individual
fan for their serial numbers. Once this process is completed, a “Change Fan Address” prompt screen will appear,
and in case it is desirable to swap fan positions in the network please see 4.6 Swapping fan numbers and
addresses. These procedures only happen once per configuration, and the controller will then default to ‘Monitor’
operating mode and the status screen of Fan 1 will be displayed as shown in Figure 6 below:
Figure 6 - Fan status screen
The following parameters are displayed for each fan in the network, three at a time:
•Fan Condition –Healthy / Alarm / Warning / No Comms
•Warnings –Description of warnings being experienced by the fan
•Power –Power consumption (W)
•Speed –Real-time fan speed (RPM)
•Motor temperature - oC (not available for Modbus Lite reduced electronics fans)
•Electronics Temperature - oC
•Hours Run –Number of fan operational hours
•Fan control - % of maximum input signal
•Serial Number –Manufacturing serial number
•Sensor Reading (available if the controller has been configured to work with multiple pressure sensors)
Use the ‘UP’ and ‘DOWN’ buttons to cycle between different parameters, and the BACK and ENTER buttons to
cycle between different fans.
4.5 Power meter and summary screen
The power meter and summary screen is accessible by pressing the ENTER button when displaying the status
screen of the last fan in the array. An example of a power meter and summary screen is shown in Figure7 below:
Figure 7 –Power meter and Summary Screen
The top row has a summary text containing the number of fans in the system and the number of fans experiencing
alarms and/or warnings. The screen also shows the total volume/pressure of the system if one or more pressure
sensors have been installed and configured. In the example above, the real-time volume flow of the system is
shown in m3/h. If a volume/pressure alarm has been configured and triggered by the system, the second row will
change from blank to a “Volume Alarm Active” or “Pressure Alarm Active” text, the red LED status indicator will
switch on and (if configured) the alarm relay will open. The total power consumption of the system is shown in the
bottom row and consists of the sum of the power consumption from each fan converted to kilowatts.
Note: If a fan experiences alarms, warnings or communication loss, the controller will remain in the “power
meter and summary”screen but will switch on the red LED (communication loss and fan alarms) and/or the
yellow LED (fan warnings).
Parameters
being monitored
All Fans Healthy:
Green LED on
Header with Fan Number
and Fan Condition

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4.6 Swapping fan numbers and addresses
The automatic assignment of Modbus addresses to fans can be inconvenient for the user as the preference for the
fan addresses/numbers may be to follow a logical addressing based on the position of the fans in the array or
building. For this reason, it is possible to swap fan numbers and addresses such as to match the equipment or
building layout.
This option becomes available in the main menu under ‘Fan Re-Addressing’ option once the fans have initially been
found and auto-addressed by the controller. Under this option, a list of fans is displayed where it is possible to see
each fan’s fan number, Modbus address and serial number.
In cases where it is desirable to match the fan numbers with the equipment or building layout, and if the installation
has a circuit breaker for each fan installed in the desired equipment or building layout, we recommend switching
one of the fans off using the fan’s circuit breaker while on the Fan Readdressing menu and then checking which
fan serial number changed to an “Alarm” (and eventually “No Comms”) text.
Take note of that fan’s number together with the circuit breaker number, switch the fan back on and move to the
next fan. Once all fans have been processed, the notes will become a guide of how to proceed in swapping fan
numbers to achieve a match between the fan numbers and the equipment or building layout.
By selecting a fan from the list and pressing the ENTER button, it is possible to assign a new fan number/Modbus
address to that fan by using the UP and DOWN buttons. Press ENTER again and the controller will assign the
selected fan number/Modbus address to the fan.
Note 1: As a fan changes its fan number and address, the fan currently at that target fan number and address
will be changed to the selected fan’s old fan number and address - effectively “swapping” them.
Note 2: This feature is not available when using the controller with only one fan.
Note 3: It is not possible to assign a fan number outside the total number of fans e.g. if using the controller
with a 4-fan array, the fan numbers will be restricted to 1-4, with the corresponding Modbus addresses 2-5.
Note 4: It is not possible to change the fan number and address when using “Fan” as a “Sensor Input”.
5.0 Operating Modes
5.1 General
The controller can be configured to operate in four different modes:
•Monitor (Default)
•Monitor & Control
•Constant Volume/ Constant Pressure
•Modbus Relay
In “Monitor”operating mode the fans remain in their factory default settings where they are speed controlled using
their 0-10V inputs. In “Monitor & Control”and “Constant Volume / Constant Pressure”modes the controller
automatically changes the settings of each fan to allow speed control via Modbus and the analogue inputs of the
fans can no longer be used for speed control. The controller automatically changes the speed control method of
each fan when changing between different operating modes so there is no need to manually connect to each fan
and configure its speed control method.

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5.2 Main menu access and operating mode configuration
Changing the operating mode (and other configurable parameters) is possible via the Main Menu, which can be
accessed using the controller’s keypad. To access the Main Menu, scroll though the fan status pages using the
BACK button until the status of the first fan is shown. The Main Menu can then be accessed from there by pressing
the BACK button twice. See H6 –Fan Status for more details.
In cases where it is desirable to prevent unauthorised access to the main menu, please see H22 –Advanced
Settings –Main Menu Lock for details on how to activate the main menu lock and the key sequence to allow
authorised access.
IMPORTANT
The “Operating Mode” submenu will only become available inside the main menu once all fans have been
addressed. The main menu is intended for configuration purposes only - the entire controller’s monitor and/or
control operations will be halted whilst in any of its submenus except ‘Set Speed’ submenu.
After 5 minutes of inactivity inside the main menu or any of its submenus (except the “Diagnostics Menu”) the
controller will power cycle and resume its normal monitor and/or control operations.
Most changes made in the main menu and its submenus (either locally or remotely via the Modbus Slave Port)
will trigger a power reset to both fans and controller, required to activate the new parameters.
5.3 Monitor mode (default operation)
In “Monitor”operating mode, the fans are following a speed control command from a separate source connected
to each fan’s 0-10V input. The controller acts as a monitoring device where it extracts information from each fan
via Modbus and displays on the LCD screen. This information is also available to an external Modbus Master device
connected to the controller’s Modbus Slave Port, typically a BMS.
It is possible to monitor either a pressure differential or calculate the real-time volume flow by using an external
differential pressure sensor connected to the controller’s 0-10V input. This information is displayed in the Power
Meter and Summary Screen, see 4.5 Power meter and summary screen.
A typical wiring diagram for Monitor operating mode is shown below. The pressure sensor connection is optional.
Figure 8 - Wiring diagram for Monitor operating mode –with optional pressure sensor
If connecting a pressure sensor, please see Section 6.0 Pressure Sensor Connections where it shows how to
correctly install the pressure sensor to the fan and/or the equipment.
CAUTION: Risk of damaging the fans if two power supplies are connected at the same time
Do not connect fans’ 10VDC output to the controller if the controller is powered from an external power
supply.

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CAUTION: Risk of damaging the sensor if the controller’s power supply voltage exceeds the maximum
voltage input of the sensor. All “+” controller terminals are common.
Check the sensor voltage input rating before connecting it to the controller.
CAUTION: Risk of damaging the controller’s 0-10V input. Any signals higher than 10V may damage the 0-
10V input of the controller.
Check the sensor voltage output range before connecting it to the controller.
5.4 Monitor & control mode
In “Monitor & Control”operating mode the fans no longer respond to a separate speed signal i.e. a 0-10V analogue
signal connected to the analogue input terminal of each fan. Instead, all fans are automatically configured to
Modbus speed control and receive the same speed setpoint from the controller via Modbus. The speed setpoint is
based on inputs at the controller which are called “control modes".
The controller supports three control modes: 0-10V, Modbus and Keypad and it is possible to set the controller to
respond to each control mode individually or in a combination:
Single Control Option
If only one control mode is selected the controller will only respond to the output from the source specified i.e. if
keypad control mode is specified, the controller will respond only to a speed setpoint change made at the keypad.
Multiple Control Options
There may be a requirement for more than one control mode option, such as in the case of manual override. Using
multiple control modes prioritises the last instruction received.
Below an example of a sequence of events taking place to control the speed setpoint when all three control
modes have been selected:
1) A 3.5V signal is connected to the 0-10V input of the controller - fans run at 35% speed.
2) An external Modbus Master device connected to the controller’s Modbus Slave Port writes a value of 50
to the controller’s Holding Register 4 - fans increase speed to 50%
3) The controller’s keypad is then used to slow the fans to 20% speed - the fans decrease their speed to
20%.
4) The external Modbus Master device writes 70 to the controller’s Holding Register 4 - the fans accelerate
to 70% speed, etc.
IMPORTANT
If the speed setpoint is changed using the controller’s keypad or the 0-10V input control mode, the latest
setpoint is recalled by the controller in the event of a power cycle. However, this does not apply in case the
speed setpoint is changed using the Modbus control mode unless the “Save Modbus Control Speed Setpoint”
register has been set.
5.4.1 Controlling the fan array speed using the controller’s 0-10V input (0-10V Control Mode)
The controller responds to a 0-10V signal connected to its 0-10V input terminal. This can be from either an external
system or from a 10kΩ potentiometer connected to a +10VDC supply. The controller has a dedicated 10V output
if required hence there are three possible wiring diagrams for the 0-10V control mode:

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Figure 9 - Wiring diagram for Monitor & Control operating mode and 0-10V control mode –potentiometer control
signal and 10V supply from fans
IMPORTANT: When powering the controller using the 10V 10mA output from the fans it is required to use at
least two fans’ power supplies connected in parallel to provide enough current to the controller
Figure 10 - Wiring diagram for Monitor & Control operating mode and 0-10V control mode –potentiometer control
signal and external power supply
Figure 11 - Wiring diagram for Monitor & Control operating mode and 0-10V control mode –external control
signal
CAUTION: Risk of damaging the fans if two power supplies are connected at the same time:
Do not connect fans’ 10VDC output to the controller if the controller is powered from an external power
supply.
5.4.2 Controlling the fan array speed using the controller’s RS485 Slave port (Modbus Control Mode)
The controller is configured to receive Modbus commands from an external device connected to its RS485 slave
port e.g. a BMS. The speed setpoint can be changed by writing a new value to the controller’s Modbus holding
register address 4. The value must be between 0 and 100 which the controller will then broadcast the new speed
setpoint to all connected fans whilst retaining monitoring and alarm functionality.

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The wiring diagram for this control mode is shown below:
Figure 12 - Wiring diagram for Monitor & Control operating mode - Modbus RS485 control signal
CAUTION: Risk of damaging the fans if two power supplies are connected at the same time:
Do not connect fans’ 10VDC output to the controller if the controller is powered from an external power
supply.
5.4.3 Controlling the fan array speed using the controller’s keypad (Keypad Control Mode)
A new submenu called “Set Speed” will become available inside the Main Menu where it is possible to set the speed
setpoint using the keypad. See H9 –Operation Mode - Monitor & Control –Keypad Control. Use the UP and
DOWN buttons to change the speed setpoint in steps of 1%, or hold the ENTER button and then use the UP and
DOWN buttons to change the speed setpoint in steps of 25%.
The wiring diagram for this control mode is shown below:
Figure 13 - Wiring diagram for Monitor & Control operating mode –keypad control
CAUTION: Risk of damaging the fans if two power supplies are connected at the same time:
Do not connect fans’ 10VDC output to the controller if the controller is powered from an external power
supply.
5.4.4 Measuring fan performance using one or multiple pressure sensors
When “Monitor & Control”operating mode is selected, it is possible to monitor a 0-10V differential pressure sensor
connected to the 0-10V input of the controller or to the 0-10V input of the fan. Select “Enabled” when the “Sensor
Monitor” screen appears during the configuration of the operating mode. Then select the “Sensor Input” to either
“Controller” or “Fan”. Please note that if the selected “Sensor Input” is set to “Controller”, the 0-10V control mode
will become unavailable.

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The wiring diagram when using a differential pressure sensor connected to the controller:
Figure 14 - Wiring diagram for Monitor & Control operating mode –single sensor monitoring
See Section 6.0 Pressure Sensor Connections where it shows how to correctly install the pressure sensor to
the fan and/or the equipment.
CAUTION: Risk of damaging the fans if two power supplies are connected at the same time:
Do not connect fans’ 10VDC output to the controller if the controller is powered from an external power
supply.
CAUTION: Risk of damaging the sensor if the controller’s power supply voltage exceeds the maximum
voltage input of the sensor. All “+” controller terminals are common:
Check the sensor voltage input rating before connecting it to the controller.
CAUTION: Risk of damaging the controller’s 0-10V input. Any signals higher than 12V may damage the 0-
10V input of the controller:
Check the sensor voltage output range before connecting it to the controller.
To monitor one or more pressure sensors using the 0-10V input of the fans, select “Fan” as the “Sensor Input”.
Please see Section 8.0 Multi-Sensor Operation for more details.
5.5 Constant volume or constant pressure operating mode
The controller can be used with one or multiple 0-10V differential pressure sensors to maintain a volume or pressure
set point in the system in which the fans are installed. The controller automatically controls the speed of the fans
based on the input from the sensors and the configured constant volume or constant pressure setpoint.
If the controller is set to Constant Volume / Constant Pressure operating mode, the Power Meter and Summary
Screen will include a real-time display of the volume / pressure being maintained by the fan array as reported by
one or multiple differential pressure sensors.
From the Power Meter and Summary Screen, it is possible to adjust the constant volume/pressure setpoint using
the keypad by pressing the ENTER button twice whilst holding UP and DOWN buttons, see H6 –Fan Status. It is
also possible to adjust the constant volume/pressure setpoint via Modbus, please see Appendix E –Modbus
Holding Registers for Configuration & Control.
A volume or pressure alarm can be configured (see H19 –Advanced Settings –Alarm Output) which will trip
when the fans reach 100% speed and the reported volume / pressure is below the constant volume / pressure
setpoint. There is a time delay between when the alarm condition is sensed and when the controller opens the
alarm relay and turns on the red LED status indicator.
The response of the system when in Constant Volume / Constant Pressure mode is adjusted by changing the
Proportional, Integral and Derivative (PID) parameters using either the ‘Main Menu>Advanced Settings>PID

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Settings’ submenu or remotely via Modbus. Please see Appendix E –Modbus Holding Registers for
Configuration & Control for more details.
The wiring diagram when using a single pressure sensor is shown below:
Figure 15 - Typical wiring diagram for Constant volume / Constant pressure operating mode and controller sensor
input
CAUTION: Risk of damaging the fans if two power supplies are connected at the same time:
Do not connect fans’ 10VDC output to the controller if the controller is powered from an external power
supply.
CAUTION: Risk of damaging the sensor if the controller power supply voltage exceeds the maximum
voltage input of the sensor. All “+” controller terminals are common:
Check the sensor voltage input rating before connecting it to the controller.
CAUTION: Risk of damaging the controller’s 0-10V input. Any signals higher than 10V may damage the 0-
10V input of the controller:
Check the sensor voltage output range before connecting it to the controller.
To use the controller with multiple sensors please see Section 8.0 Multi-Sensor Operation for more information.
See Section 6.0 Pressure Sensor Connections where it shows how to correctly install the pressure sensor to the
fan and/or the equipment.
5.6 Modbus relay operating mode
The controller can be installed on an RS485 Modbus network and configured to act as a relay between the fans
and Modbus Master device e.g. BMS. In Modbus Relay operating mode the controller ceases all control and monitor
operations and becomes a relay for messages and commands between the Modbus Master device.
This operating mode allows exclusive access to all Modbus registers on each fan according to the latest ebm-papst
parameter specification for Modbus enabled motors. A copy of this parameter specification is available on request
by e-mail at [email protected].
See Appendix G –Example of Modbus Relay Operation for a working example of the Modbus Relay operation.
6.0 Pressure Sensor Connections
For a constant volume, or a volume monitoring system the differential pressure sensor must measure the pressure
difference between the fan inlet ring tapings and the fan air supply side. This is different for a constant pressure, or
a pressure monitoring system where the inlet ring is not required, and the sensor must measure the pressure
difference between the fan air supply and the fan exhaust. The figure below shows exactly where to connect the
differential pressure sensor positive and negative tapings:

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Figure 16 –Sensor airline connections for pressure and volume
When using inlet rings, due to potential disturbances it is recommended to use a multi-tapped inlet ring which
provides an averaged pressure value over all taps to improve the precision of the air volume measurement. If this
system operates with a single sensor, the precision of the air volume measurement can be improved further by
ensuring that all inlet ring tappings are equidistant from the sensor as shown below:
Figure 17 –Airline length for a single sensor constant volume system or volume monitoring system
Instead of using a single differential pressure sensor, it is possible to connect multiple differential pressure sensors
to the system by using the 0-10V inputs of the fans. The operation with multiple differential pressure sensors can
improve reading accuracy and introduce another fail-safe layer to the system operation as the controller
automatically adjusts the settings in the event of a sensor failure. For more details, please see Section 8.0 Multi-
Sensor Operation.
7.0 Advanced Settings
The advanced settings submenu allows the configuration of different controller and fan parameters. We recommend
reading and understanding this whole section before making any changes.
A list of all available submenus inside the Advanced Settings submenu is shown below. Please note that not all
submenus are available at once and their availability depends on the selected operating mode and if the controller
has been configured to operate with or without differential pressure sensors:

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Measurement Unit (See H13 –Adv. Settings - Sensor Reading H14 –Adv. Settings –Measurement
Unit): this submenu is only available when the controller has been configured to read one or more differential
pressure sensors and it allows the selection between metric and imperial:
•m3/h (cubic metre per hour) or CFM (cubic feet per minute) for volume.
•Pa (Pascal) or in.w.g. (inch water gauge) for pressure.
PID Settings (See H15 –Advanced Settings –PID Settings): this submenu is only available when the controller’s
operating mode has been configured to constant volume/constant pressure and it allows the configuration of the P,
I and D elements of the controller’s PID control.
Caution: Incorrect PID settings may cause unstable operation of the control loop
Sensor Reading (See H13 –Adv. Settings - Sensor Reading H14 –Adv. Settings –Measurement
Unit): this submenu is only available when using two or more differential pressure sensors and it allows the
configuration of how the total volume/pressure is calculated after all sensors have been read by the controller:
•Sum (default value for volume): the sum of all sensor readings
•Average (default value for pressure): the average across all sensors
•Minimum: the lowest value across all sensors
•Maximum: the highest value across all sensors
RPM Limit (See H16 –Advanced Settings –RPM Limit) : configures the maximum RPM limit of the fans. The
new settings will be stored in non-volatile memory in the fans, after which the fans and controller will perform a
power reset to activate the new operating parameters.
•RPM Limit All Fans
oCustom RPM: Broadcasts a custom RPM to all fans.
oSet to Max RPM: Read the maximum RPM limit of each fan and use this data to set each fan to
its maximum RPM limit.
•RPM Limit Single Fan: Provides a list of all fans and their individual RPM limits to allow setting the RPM
limit individually.
0-10V Control Cap (See H17 –Adv. Settings –0-10V Control Cap): this submenu is only available when the
controller has been configured to “Monitor” mode and it allows the configuration of the minimum and maximum 0-
10V control input the fans will respond to. The values configured here are broadcast to all fans and stored in their
non-volatile memory followed by a power reset to activate the new parameters.
0-10V Input Cap (See H17 –Adv. Settings –0-10V Control Cap H18 –Adv. Settings –0-10V Input Cap):
this submenu is only available when the controller has been configured to “Monitor & Control” operating mode and
it allows the configuration of the minimum and maximum 0-10V control input the controller will respond to. Values
configured here are saved in the controller’s non-volatile memory and used to cap the speed setpoint sent to fans.
Alarm Output (See H19 –Advanced Settings –Alarm Output): configures the alarm output settings such as
enabled/disabling the onboard relay and selecting the type of faults that will cause the alarm to trip:
•Relay Operation: on this submenu it is possible to enable the onboard relay operation and select if fan
alarms, fan warnings or both would cause the relay to open.
•Volume/Pressure Alarm: available when monitoring a sensor or when in constant volume / pressure
operating mode.