Ebmpapst CN1116 Manual

Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
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© ebm-papst UK Ltd 2021
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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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© ebm-papst UK Ltd 2021
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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

Operating and Maintenance Instructions
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CN1116 Full OMI
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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

Operating and Maintenance Instructions
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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

Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
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© ebm-papst UK Ltd 2021
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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

Operating and Maintenance Instructions
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CN1116 Full OMI
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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.

Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
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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.