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ebm-papst CN1127 Manual

ebm-papst CN1127 Manual

Modbus monitor & control unit
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OMI-CN1127-2025-01-V01
CN1127
Modbus Monitor
& Control Unit

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Summary of Contents for ebm-papst CN1127

  • Page 1 OMI-CN1127-2025-01-V01 CN1127 Modbus Monitor & Control Unit...

  • Page 2: Table Of Contents

    CN1127 - MMCU Contents List Tables ..............................3 List of Figures ............................... 3 General notes ............................ 4 1.1 Exclusion of liability ..........................4 1.2 Introduction ............................5 Safety notice ............................5 3.0 Overview ..............................6 3.1 Specification ............................6 3.2 Installation ............................6 3.3 Hot plugging ............................
  • Page 3 CN1127 - MMCU ....................22 5.6 Multi source control mode ............ 24 5.7 Group 2 offset ..............25 5.8 Summary Page ..............26 5.9 Fan Status Page ..............27 6.0 Pressure sensor connections ........... 28 6.1 Sensor configuration ......................... 29 6.2 Sensor wiring and airline connections ....................

  • Page 4: List Tables

    CN1127 - MMCU 17.0 Maintenance and servicing ............ 45 18.0 CE Certificates ............... 45 Appendix A ..................46 A.1 Proportional Control Graph..........46 A.2 Constant Volume strategy based on Backward curved centrifugal fan ................. 47 A.3 Constant Volume with capped fan speed based on Backward curved centrifugal fan ....48 A.4 Dual setpoint ..........................

  • Page 5: General Notes

    CN1127 - MMCU Figure 10 - Connecting to tapping rings for Volume measurement. 28 Figure 11 - Example connection of pressure sensor connected to a fan Vout supply................29 Figure 12 – Example connection of pressure sensor connected to a separate power supply..............

  • Page 6: Introduction

    The Modbus Monitor & Control Unit (MMCU) is a device with two RS485 ports for accessing the status of the connected equipment. The ‘RS485 fan’ 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.

  • Page 7: Overview

    CN1127 - MMCU 3.0 Overview 3.1 Specification Product Modbus Monitor & Control Unit - CN1127 Supply Voltage 24 VDC nominal (12 to 57VDC) from an external PSU or (Reverse Polarity Protected) 24 VAC nominal (20 to 28VAC) from an external transformer...

  • Page 8: Configuration And First Use

    CN1127 - MMCU 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 ‘Link bar’ located on the PCB. Two resistors of the same value must be added at each end of the network.
  • Page 9 CN1127 - MMCU Connection Description Function Button 1 Wake up Wi-Fi Press & hold for 5 secs Green Good / powered LED indicator for good operation - Flashing Yellow Warning LED indicator for Warnings Alarm LED indicator for Alarms Button 2 Software Reset Press &...

  • Page 10: Initial Power On

    CN1127 - MMCU 4.2 Initial power ON When power is applied, all three LED’s will come on briefly and then the green light will blink slowly to confirm power is applied. The controller will check the on-board memory for a previously stored fan array and configuration. If there is no previously stored information, please follow the first-time configuration instructions.

  • Page 11: Setting The Device Name And Password

    CN1127 - MMCU 4.3.4 Setting the Device name and password. The entered device name will be assigned as the Wi-Fi name, i.e. “Controller 1”, which will be displayed instead of “MMCU xx:xx:xx:xx:xx:xx” for future connection. Enter a password and then re-enter to confirm.

  • Page 12: Fan Addressing - Configure External Modbus Communications

    CN1127 - MMCU New fans are supplied from the factory as Modbus address 1 with 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 default values are suggested on the Fan addressing screen.

  • Page 13: Fan Addressing - Auto Addressing (Serial No. Based Addressing)

    CN1127 - MMCU 4.3.7 Fan addressing – auto addressing (Serial no. based addressing) When new fans are supplied from the factory, they will all have the Modbus address 1 as default. These will need to go through an auto address process (See 4.3.7.2).

  • Page 14: Auto Address Fans

    CN1127 - MMCU 4.3.7.2 Auto address fans Select “Auto address fans”. The controller will verify and display how many fans it has detected, and then ask for confirmation. The yellow light will flash briefly as a fan is found. (See Table 9).

  • Page 15: Visual Re-Ordering

    CN1127 - MMCU 4.3.8.1 Visual Re-ordering Depending on the generation of the fan, there are two features to help identify which fan is being moved. For Gen3 fans with Modbus version 6.5 or above you can use the LED on the back of the fan to identify which one to move. The default operation for all other fans is to nudge the fan slightly so you can identify it.

  • Page 16: Dci Reordering

    CN1127 - MMCU 4.3.8.2 DCI Reordering If you are using Gen3 fans Modbus 6.3 or above another option is to use the Daisy Chain method of re-ordering. This is useful when visibility for all fans is not possible due to the amount of fans or location.
  • Page 17 CN1127 - MMCU 4.3.9 Fan Grouping The Fan array can be split into two groups if required for example if a system is split into two separate chambers where the performance of each group may be required to be different. Depending on the Operating mode, different control methodologies for the groups are applied (See Section 5.0).

  • Page 18: Operating Modes

    CN1127 - MMCU 5.0 Operating modes 5.1 Overview Note: This page can also be reached by pressing “Mode Select” from the side bar. Note: When any mode is selected, the fans will stop running as they are now being configured.
  • Page 19 CN1127 - MMCU Control Group 1 sensor Group 2 sensor Operation mode Fan Group Sensor Input input monitor monitor Not available None None 0-10V 1 Fan input Monitor Not available directly Controller Controller 0-10 V 2 4-20mA Not available None...

  • Page 20: Monitor Mode

    CN1127 - MMCU 5.2 Monitor mode Monitor mode can be used to monitor the status of all Modbus fans attached, giving an overview (see table 7 & 8) of critical fan information, alarms, and warnings. Fan control is handed back to the local fan 0-10v input Ain1U or IO2 depending on the generation of fan.

  • Page 21: Webserver Control Mode

    CN1127 - MMCU 5.3 Webserver control mode Webserver control mode is a manual input fixed speed % entered from the Webserver App using your phone, tablet, laptop or HMI. It can be used to speed control a group of fans and monitor the status of all fans attached, giving an overview (see table 7 &...

  • Page 22: Proportional Control Mode

    CN1127 - MMCU 5.4 Proportional control mode Proportional control mode is an open loop control mode accepting an input from an external source to control the speed of a group of fans and monitor the status of all fans attached, giving an overview (see table 7 & 8) of critical fan information, alarms and warnings.

  • Page 23: Constant Volume / Pressure Mode

    CN1127 - MMCU 5.5 Constant Volume / Pressure mode Constant Volume / Pressure mode is a closed loop control which requires at least one pressure sensor connected to the system. (See Section 6.0) for how to select the correct sensor range and arrange one or more sensors depending on the required mode of operation.

  • Page 24: Figure 6 - Switch Between Two Setpoints

    CN1127 - MMCU After setting up the sensor / sensors and pressing “Confirm” you can then set a target Setpoint or Setpoints. A single setpoint is the default. The units to be used are defined by the operation mode (Volume or Pressure) and whether you are using metric or imperial units.

  • Page 25: Multi Source Control Mode

    CN1127 - MMCU 5.6 Multi source control mode Multi source control mode can be used to speed control a group of fans and monitor the status of all fans attached, giving an overview (see table 7 & 8) of critical fan information, alarms and warnings.

  • Page 26: Group 2 Offset

    CN1127 - MMCU 5.7 Group 2 offset The Group 2 offset is available for Webserver, Proportional and Multi source control modes. It offers a + % tracking of the Group 1 speed settings either with less or more performance. For example, in Webserver mode, if Group 1 is set to 50% speed and Group 2 offset is set to +50% then Group 2 will run at 75%.

  • Page 27: Summary Page

    CN1127 - MMCU 5.8 Summary Page The Summary page exists for up to 2 groups. The layout is the same for each operational mode but with more or less information provided. Heading Description System Fan Type Motor generation and Modbus protocol version for group of fans.

  • Page 28: Fan Status Page

    Table 8 - Fan status headings Note * - 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, some parameters are not available. Note *...

  • Page 29: Pressure Sensor Connections

    CN1127 - MMCU 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 tapping’s 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.

  • Page 30: Sensor Configuration

    6.2 Sensor wiring and airline connections We recommend using ebm-papst SN1120 or SN1121 series differential pressure sensors as they have been specifically designed for fan arrays and can be powered from a fan’s 10V 10mA, or 24V supply. It simplifies...

  • Page 31: Figure 12 - Example Connection Of Pressure Sensor Connected To A

    CN1127 - MMCU Power supply 0-10V ∆Pa Ain1U / IO2 Figure 12 – Example connection of pressure sensor connected to a separate power supply. Note: Do not connect more than one sensor per fan. Note: Please ensure that the selected fan 0-10V input terminal where the sensor output is connected to is the same as the configured fan sensor input on the controller.

  • Page 32: Choosing The Pressure Sensor Range For Constant Volume

    CN1127 - MMCU 6.3 Choosing the pressure sensor range for constant volume �������� For volume measurement the choice of sensor range is not related to the pressure drop across the fan but ∆���� = the pressure drop across the inlet ring. To calculate the required pressure, use the following equation.

  • Page 33: Sensor Mapping

    CN1127 - MMCU 6.4 Sensor mapping 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...

  • Page 34: Advanced Settings

    CN1127 - MMCU 7.0 Advanced settings Note: When entering this page, the fans will stop running. 7.1 Communication Settings for Fans Displays current settings stored in the controller. Update and press “Set” to confirm and save changes. (see Table 4) 7.2 Communication Settings for BMS...

  • Page 35: Controller And Fans Reset

    CN1127 - MMCU 7.3 Controller and Fans Reset Press “Factory reset controller and fans”. Press “back” to return to the previous page. Press “proceed” to reset the controller and fans. The controller will restart and return to the beginning of “Powering up for the first time”.

  • Page 36: Controller Input Cap (0-100%)

    CN1127 - MMCU 7.5 Controller Input Cap (0-100%) The controller input cap can restrict the range of the input if connected to a sensor for example only in Proportional (open loop) control mode. A hysteresis is used to ensure the system doesn’t oscillate on/off at a threshold point.

  • Page 37: External Switch Input 2 Setpoint 1 / Setpoint 2

    CN1127 - MMCU 7.7 External Switch Input 2 Setpoint 1 / Setpoint 2 Switch Input 2 is used to toggle between setpoints when in Constant Pressure or Volume mode. By default, when the input is open/high, setpoint 1 is active, when the input is close/low, setpoint 2 is active.

  • Page 38: 0-10V Output Follower

    CN1127 - MMCU 7.9 0-10V Output Follower This output can be used to track one of the groups of fans and control an external device such as a Belimo damper. By default, Group 1 is selected to follow. If there is no Group 2 the selection is disabled.

  • Page 39: Resonance Avoidance

    CN1127 - MMCU Setpoint Warning If the fans are running at maximum speed (or capped speed) in Constant Pressure / Volume mode and the setpoint has not been achieved, a warning will be set. This is a controller warning and is independent from the Fan Alarm / Warning setting.

  • Page 40: Figure 18 - Resonance Avoidance Speed Mask Pre-Step Change

    CN1127 - MMCU If at least 1 fan has been completed and the controller has saved this information, “Enable masking for detected ranges” checkbox will be enabled. A table showing the detected resonances will also be displayed for finished fans. Users have an option in selecting either pre or post step change for the mask.

  • Page 41: Fan Communications Diagnostics

    CN1127 - MMCU Pressing the “Abort” button aborts the test and does not save the results for the fan under test. Pressing the “Pause” button will pause the test on the next fan. The currently tested fan continues running the resonance routine. When it has completed the test, the speed stays at 100% but the new fan does not start until the “Resume”...

  • Page 42: Customer Information

    CN1127 - MMCU 7.16 Customer Information Customer information allows an MMCU to be given a unique identity and location for use when connected to InSights dashboard or to a BMS. Each entry is alpha numeric. The Customer ID must relate to a given customer country and account reference that will match with their Dashboard workspace.

  • Page 43: Sd Card Update

    Only SD card formatted as FAT32 sizes up to 16GB are supported. To update the device, insert the SD card with the correct .hex file (provided by ebm-papst (UK) Ltd), press “Update via SD Card” button and wait for the process to finish, device will restart after the update is complete.

  • Page 44: Replacing The Controller

    CN1127 - MMCU 9.0 Replacing the controller If the controller unit becomes faulty and needs to be replaced, ensure that the new controller is at its factory default settings before connecting it to the fan network. As the fans will already be addressed, you can set up the controller to address the fans using Fan “Existing Fan Array”.

  • Page 45: Dimensions

    CN1127 - MMCU 12.0 Dimensions Page 44 of 57...

  • Page 46: Weee (Waste Electrical And Electronic Equipment)

    CN1127 - MMCU 13.0 WEEE (Waste Electrical and Electronic Equipment) ebm-papst UK Ltd complies with the Waste Electrical and Electronic Equipment (WEEE) Regulations through membership of a producer compliance scheme (PCS) as a B2B producer. EEE Producer registration number: WEE/CA0209WR.

  • Page 47: Proportional Control Graph

    CN1127 - MMCU Appendix A A.1 Proportional Control Graph Max rpm 100% Fan max cap Fan min cap 100% Hysterisis Input min cap Input max cap Input V% Switch off = Xmin - Hysterisis Page 46 of 57...

  • Page 48: Constant Volume Strategy Based On Backward Curved Centrifugal Fan

    CN1127 - MMCU A.2 Constant Volume strategy based on Backward curved centrifugal fan Nominal setpoint configured with low system resistance. An increase in system resistance initially reduces volume flow. Speed may remain similar depending on impeller type. MMCU responds by increasing fan speed and volume to get back to setpoint.

  • Page 49: Constant Volume With Capped Fan Speed Based On Backward Curved Centrifugal Fan

    CN1127 - MMCU A.3 Constant Volume with capped fan speed based on Backward curved centrifugal fan The application should always be designed to allow enough fan performance to cover conditions such as dirty filter or normal increases in system resistance.
  • Page 50 CN1127 - MMCU Page 49 of 57...

  • Page 51: Dual Setpoint

    CN1127 - MMCU A.4 Dual setpoint Example below is set up for 2000 m /h for setpoint 1 and 3300m /h for setpoint 2. Always ensure the fan or fans can achieve the required duty point even under higher system resistance such as a dirty filter condition.

  • Page 52: Modbus Holding Registers For Site Design

    CN1127 - MMCU Appendix B B.1 Modbus holding registers for site design The purpose of the registers below is for system location, configuration and parameter summary. SITE DESIGN HOLDING REGISTERS ADDR (HEX) ADDR (DEC) DESCRIPTION VALUE CUSTOMER ID 0-65535; 0 is the default value SITE NUMBER 0-65535;...
  • Page 53 CN1127 - MMCU GROUP 2 SENSOR MAX RANGE 0-3500; representing 0-3500Pa GROUP 2 SENSOR READING METHOD 0 – average; 1 – minimum; 2 - maximum GROUP 2 FAN K FACTOR 0 – 65535; representing k factor of fan inlet ring for volume calc GROUP 1 SETPOINT 2 HIGH * 0-65535 –...

  • Page 54: Modbus Holding Registers For Remote System Overview

    CN1127 - MMCU B.3 Modbus holding registers for remote system overview The purpose of the registers below is for remote monitoring of group 1 and group 2 fan array statuses such as group total power consumption and group total volume or pressure. The registers are read only.

  • Page 55: Modbus Holding Registers For Individual Fan Monitoring

    CN1127 - MMCU B.4 Modbus holding registers for individual fan monitoring The purpose of the registers is for remote monitoring of individual fans of the system. A “2-Fan Array” is used as an example. This set of registers scales up and down depending on the total connected fans.
  • Page 56 CN1127 - MMCU * See Table 14 below for information about the fan alarm and fan warning registers ** Parameter 11 is the “Sensor Reading” which is a 32-bit value comprised of two 16-bit (high and low) values. This parameter is only available when using the fan as...

  • Page 57: Fan Alarm And Warning Register

    CN1127 - MMCU B.5 Fan Alarm and warning register FAN ALARM REGISTER FAN WARNING REGISTER Table 14 - Fan alarm & warning registers Page 56 of 57...

  • Page 58: Modbus Direct Fan Access

    CN1127 - MMCU B.6 Modbus Direct fan access Use below Modbus Direct fan access registers to communicate with a fan directly. It is only possible to access the registers of one fan at a time. Fan Modbus Address Register 0x1FF value can be set to change the communicating fan.
  • Page 59 OMI-CN1127-2025-01-V01 www.ebmpapst.com ebm-papst UK Springfield Lyons Approach Chelmsford Essex Phone 01245 468 555 name@mailaddress.com...

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