MEAN WELL CMU2 series: rack-mount inverter-management controller - CMU2E-R

Description

CMU2E-R — rack-mount inverter-management controller

MEAN WELL CMU2E-R is a 3U 19-inch rack-mount inverter-management controller with a 7-inch touch display, Ethernet monitoring and RS-485 Modbus RTU communication for supported NTN-5K inverters. Each connected inverter must have a unique address; the controller supports up to 32 addresses.

Download MEAN WELL CMU2 Datasheet (PDF)
Download MEAN WELL CMU2E User Manual (PDF)

CMU2 combined catalog, dated 2026-02-11. Configuration and supported-equipment tables are on page 8; mounting and accessory details are on pages 3–5 and 9–10.

Model and configuration

Parameter Details
Application and enclosure Application E: inverter management. Enclosure: 3U 19-inch rack-mount.
Configuration selection This application/enclosure code does not identify the three extension-card slots. Confirm the complete ordering configuration and the application firmware; the shared platform connector list does not mean every interface is enabled.
Extension-card coding P = PMBus card (two PMBus v1.1 ports); C = CANBus card (two CANBus 2.0B ports); R = RS-232/RS-485/USB card (including two USB ports); # = blank slot. Card capabilities and active connector functions depend on the application. The separate -R after the application code denotes the rack-mount enclosure.
Supported inverters The catalog lists NTN-5K for CMU2E-### and CMU2E-R-###. Confirm the connected inverter’s firmware and supported functions; the controller does not add capabilities absent from the inverter.

Monitoring and operation

Parameter Details
Touch display 7-inch TFT LCD, 800 × 480 resolution, capacitive touch panel. The application determines the status screens and commands available.
Monitored information Inverter-management screens show connected-unit status, input/output voltage and supported current, temperature, fan-speed, serial-number and firmware data. Displayed operating modes and battery/charging parameters depend on the connected inverter.
Local controls Touchscreen operation; the rack panel also provides F1–F4, return, enter, up/down keys and a rotary control. Functions depend on the application page.
Indicators and buzzer Green: power-on/normal conditions; red: fault/abnormal conditions. Confirm the steady/flashing alarm pattern in the manual for the supplied application firmware. Button-click sound and alarms, with mute.
Ethernet and web interface IEEE 802.3, 10/100BASE network. The platform supports TCP/IP, NTP, SMTP and Modbus TCP; the web server provides application-specific system status, parameters, data logging and download. Configure access and settings using the applicable user manual.
Data and event logging Date/time-stamped data and event logs require an installed SD card. The application manual specifies SDHC cards from 4 GB to 32 GB.
Clock retention The RTC uses supercapacitors with a stated retention of only 7 days. Readjust the date/time after a longer unpowered interval.
Language and firmware English, Traditional Chinese and Simplified Chinese interfaces. Firmware updates are supported through SD card or Ethernet; use firmware intended for the actual application and follow its update procedure.

Application interfaces and wiring

Parameter Details
Enabled connector functions For E-### configurations: programmable relays, RS-485, DIN, DOUT, CANBus and Ethernet. AIN, AOUT and RS-232 are not functional. The E user manual explicitly marks PMBus as not supported; inverter communication uses RS-485 Modbus RTU.
Relay rating Platform provision: four user-programmable relay channels, rated 30 V / 1 A. Use only the application’s supported relay functions.
Relay connector 12-pin DECA MX422-25412 or equivalent. Relays 1/2/3/4 use pin groups 1–3 / 4–6 / 7–9 / 10–12 respectively; each group is NO, NC, COM in ascending pin order.
Digital I/O Five isolated open-collector digital inputs and five digital outputs, referenced to FG. DOUT maximum signal voltage is 5 V relative to FG. DIN open from FG or +5 V = logic 1; shorted to FG or 0 V = logic 0.
DIN/DOUT connector pins Each 10-pin connector uses pins 1, 3, 5, 7 and 9 for channels 1–5; pins 2, 4, 6, 8 and 10 are FG. The catalog identifies HIROSE DF11-10 or equivalent connectors.
Bus connector pins CANBus paired RJ45: pins 4/12 = remote ON/OFF CONTROL, 6/14 = CAN-H, 7/15 = CAN-L, 8/16 = FG. Pins 1, 2, 3, 5, 9, 10, 11 and 13 are NC. Bus signals are isolated with FG as reference; connect only the interface enabled by this application.
Analog I/O availability The shared platform specification lists five 0–10 V analog outputs and five 0–10 V analog inputs with 12-bit resolution. These analog functions are marked non-functional for the listed E application configurations.
RS-485 connector Pin 1 = D− / DB; pin 2 = D+ / DA; pins 3 and 4 = FG. Use the Modbus RTU connection and unique inverter addresses specified by the E manual.
Ethernet connector RJ45: pin 1 TX+, 2 TX−, 3 RX+, 6 RX−; pins 4, 5, 7 and 8 are FG. Do not confuse Ethernet with the physically similar PMBus/CANBus connectors.
Communication capacity Up to 32 unique inverter addresses over RS-485 Modbus RTU. This E-application limit is separate from the C application’s three 64-address groups and the catalog’s power-supply parallel examples.

Input, environment and standards

Parameter Details
Input voltage and frequency 85–264 VAC, 47–63 Hz; 120–370 VDC. Use the published operating range for the supplied unit; the AC connector labels do not establish a DC polarity assignment.
Input current 0.6 A at 115 VAC; 0.4 A at 230 VAC.
AC input connector Pin 1 = AC/N, pin 2 = AC/L, pin 3 = FG. Follow the input and grounding instructions for the supplied controller.
Operating temperature −25°C to +60°C. The LCD may freeze below −20°C; this display limitation remains applicable within the controller’s stated operating range.
Storage temperature −40°C to +60°C.
Vibration 10–500 Hz, 2G, 10 minutes per cycle; 60 minutes along each X, Y and Z axis.
Safety standards IEC 62368-1 and BS EN/EN 62368-1 approved.
Withstand voltage Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.7 kVDC. CN36 and CN37 are considered output for these tests.
Insulation resistance Output–FG: 100 MΩ at 500 VDC, 25°C and 70% RH.
EMC emissions BS EN/EN 55032 (CISPR 32): conducted Class B and radiated Class A; BS EN/EN 61000-3-2 and -3-3.
EMC immunity BS EN/EN 61000-4-2, -3, -4, -5, -6, -8 and -11; the catalog also lists BS EN/EN 61000-6-1 with BS EN/EN 50082-2 in parentheses, light-industry level, criteria A.
System integration The controller is a component. Catalog EMC tests cover the controller alone without connected control equipment; reconfirm EMC compliance in the final assembled equipment.
MTBF reference 690,300 hours minimum per Telcordia TR/SR-332; 78,900 hours minimum per MIL-HDBK-217F at 25°C. These are reliability estimates, not a guaranteed service life.

Dimensions and mounting

Parameter Details
Dimensions 483.6 × 66.3 × 132 mm (L × W × H), 3U 19-inch rack-mount format. The drawing separately shows a 14.6 mm projecting rotary control; allow front operating clearance.
Mechanical drawing Catalog general dimensional tolerance: ±1 mm. Rack slot center spacing is 466.2 mm horizontally and 80 mm vertically; follow the full mounting-slot drawing.
Mounting Install in a compatible 19-inch rack. Standalone wall, DIN-rail and desktop fittings are not the rack-mount arrangement.
Mounting accessories The catalog’s DIN-rail bracket and desktop stand are for standalone installations; do not assume they are supplied with or suitable for this rack-mount unit.
Unit mass 2160 g, catalog packing reference per unit (2.16 kg; 6 pieces / 14 kg / 2.91 CUFT). This is not a separately declared measured net mass.
Manufacturer warranty reference The catalog states a five-year manufacturer warranty, subject to its applicable terms.

Manufacturer installation and commissioning instructions

Parameter Details
Electrical connection Connect AC input pin 1 to neutral, pin 2 to line and pin 3 (FG) to protective earth. This Class I controller requires a reliable protective-earth connection.
Installation environment Avoid locations with high moisture, high ambient temperature or direct sunlight. Protect the LCD from sharp tools. Have faults examined by a qualified technician; do not remove the controller case yourself.
Inverter communication For the NTN-5K application, connect the inverter network through RS-485 using Modbus RTU. Assign each connected inverter a unique address; the CMU2E supports up to 32 device addresses. PMBus is not supported for this application.
RS-485 connection RS-485 pin 1 is D-/DB, pin 2 is D+/DA, and pins 3 and 4 are FG. Follow the inverter wiring and configuration instructions before commissioning.
Digital I/O limits Digital inputs and outputs are isolated open-collector signals referenced to FG. Digital outputs have a maximum signal voltage of 5 V. For digital inputs, an open input or +5 V is logic high; a connection to FG or 0 V is logic low.
Logging and card access Data and event logging require an installed 4–32 GB SDHC card. Follow the model-specific card-access instructions and refit the cover after inserting the card.
Application compatibility Confirm the supplied extension-card configuration and connected inverter firmware before commissioning. Charging, solar and grid-feeding options apply only when supported by the connected inverter.
Alarm indication and version The current catalog describes a steady red fault indication, while the CMU2E manual describes a flashing red alarm. Follow the indication guidance for the supplied controller version.
Rack mounting Install the rack-mount version using M5 × 12 mm screws as shown in the dedicated mounting diagram. The standalone DIN-rail and desktop attachments do not apply to this version.

MEAN WELL CMU2 series: rack-mount inverter-management controller - CMU2E-R

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CMU2E-R — rack-mount inverter-management controller MEAN WELL CMU2E-R is a 3U 19-inch rack-mount inverter-management controller with a 7-inch touch display,... Read more

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    Description

    CMU2E-R — rack-mount inverter-management controller

    MEAN WELL CMU2E-R is a 3U 19-inch rack-mount inverter-management controller with a 7-inch touch display, Ethernet monitoring and RS-485 Modbus RTU communication for supported NTN-5K inverters. Each connected inverter must have a unique address; the controller supports up to 32 addresses.

    Download MEAN WELL CMU2 Datasheet (PDF)
    Download MEAN WELL CMU2E User Manual (PDF)

    CMU2 combined catalog, dated 2026-02-11. Configuration and supported-equipment tables are on page 8; mounting and accessory details are on pages 3–5 and 9–10.

    Model and configuration

    Parameter Details
    Application and enclosure Application E: inverter management. Enclosure: 3U 19-inch rack-mount.
    Configuration selection This application/enclosure code does not identify the three extension-card slots. Confirm the complete ordering configuration and the application firmware; the shared platform connector list does not mean every interface is enabled.
    Extension-card coding P = PMBus card (two PMBus v1.1 ports); C = CANBus card (two CANBus 2.0B ports); R = RS-232/RS-485/USB card (including two USB ports); # = blank slot. Card capabilities and active connector functions depend on the application. The separate -R after the application code denotes the rack-mount enclosure.
    Supported inverters The catalog lists NTN-5K for CMU2E-### and CMU2E-R-###. Confirm the connected inverter’s firmware and supported functions; the controller does not add capabilities absent from the inverter.

    Monitoring and operation

    Parameter Details
    Touch display 7-inch TFT LCD, 800 × 480 resolution, capacitive touch panel. The application determines the status screens and commands available.
    Monitored information Inverter-management screens show connected-unit status, input/output voltage and supported current, temperature, fan-speed, serial-number and firmware data. Displayed operating modes and battery/charging parameters depend on the connected inverter.
    Local controls Touchscreen operation; the rack panel also provides F1–F4, return, enter, up/down keys and a rotary control. Functions depend on the application page.
    Indicators and buzzer Green: power-on/normal conditions; red: fault/abnormal conditions. Confirm the steady/flashing alarm pattern in the manual for the supplied application firmware. Button-click sound and alarms, with mute.
    Ethernet and web interface IEEE 802.3, 10/100BASE network. The platform supports TCP/IP, NTP, SMTP and Modbus TCP; the web server provides application-specific system status, parameters, data logging and download. Configure access and settings using the applicable user manual.
    Data and event logging Date/time-stamped data and event logs require an installed SD card. The application manual specifies SDHC cards from 4 GB to 32 GB.
    Clock retention The RTC uses supercapacitors with a stated retention of only 7 days. Readjust the date/time after a longer unpowered interval.
    Language and firmware English, Traditional Chinese and Simplified Chinese interfaces. Firmware updates are supported through SD card or Ethernet; use firmware intended for the actual application and follow its update procedure.

    Application interfaces and wiring

    Parameter Details
    Enabled connector functions For E-### configurations: programmable relays, RS-485, DIN, DOUT, CANBus and Ethernet. AIN, AOUT and RS-232 are not functional. The E user manual explicitly marks PMBus as not supported; inverter communication uses RS-485 Modbus RTU.
    Relay rating Platform provision: four user-programmable relay channels, rated 30 V / 1 A. Use only the application’s supported relay functions.
    Relay connector 12-pin DECA MX422-25412 or equivalent. Relays 1/2/3/4 use pin groups 1–3 / 4–6 / 7–9 / 10–12 respectively; each group is NO, NC, COM in ascending pin order.
    Digital I/O Five isolated open-collector digital inputs and five digital outputs, referenced to FG. DOUT maximum signal voltage is 5 V relative to FG. DIN open from FG or +5 V = logic 1; shorted to FG or 0 V = logic 0.
    DIN/DOUT connector pins Each 10-pin connector uses pins 1, 3, 5, 7 and 9 for channels 1–5; pins 2, 4, 6, 8 and 10 are FG. The catalog identifies HIROSE DF11-10 or equivalent connectors.
    Bus connector pins CANBus paired RJ45: pins 4/12 = remote ON/OFF CONTROL, 6/14 = CAN-H, 7/15 = CAN-L, 8/16 = FG. Pins 1, 2, 3, 5, 9, 10, 11 and 13 are NC. Bus signals are isolated with FG as reference; connect only the interface enabled by this application.
    Analog I/O availability The shared platform specification lists five 0–10 V analog outputs and five 0–10 V analog inputs with 12-bit resolution. These analog functions are marked non-functional for the listed E application configurations.
    RS-485 connector Pin 1 = D− / DB; pin 2 = D+ / DA; pins 3 and 4 = FG. Use the Modbus RTU connection and unique inverter addresses specified by the E manual.
    Ethernet connector RJ45: pin 1 TX+, 2 TX−, 3 RX+, 6 RX−; pins 4, 5, 7 and 8 are FG. Do not confuse Ethernet with the physically similar PMBus/CANBus connectors.
    Communication capacity Up to 32 unique inverter addresses over RS-485 Modbus RTU. This E-application limit is separate from the C application’s three 64-address groups and the catalog’s power-supply parallel examples.

    Input, environment and standards

    Parameter Details
    Input voltage and frequency 85–264 VAC, 47–63 Hz; 120–370 VDC. Use the published operating range for the supplied unit; the AC connector labels do not establish a DC polarity assignment.
    Input current 0.6 A at 115 VAC; 0.4 A at 230 VAC.
    AC input connector Pin 1 = AC/N, pin 2 = AC/L, pin 3 = FG. Follow the input and grounding instructions for the supplied controller.
    Operating temperature −25°C to +60°C. The LCD may freeze below −20°C; this display limitation remains applicable within the controller’s stated operating range.
    Storage temperature −40°C to +60°C.
    Vibration 10–500 Hz, 2G, 10 minutes per cycle; 60 minutes along each X, Y and Z axis.
    Safety standards IEC 62368-1 and BS EN/EN 62368-1 approved.
    Withstand voltage Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.7 kVDC. CN36 and CN37 are considered output for these tests.
    Insulation resistance Output–FG: 100 MΩ at 500 VDC, 25°C and 70% RH.
    EMC emissions BS EN/EN 55032 (CISPR 32): conducted Class B and radiated Class A; BS EN/EN 61000-3-2 and -3-3.
    EMC immunity BS EN/EN 61000-4-2, -3, -4, -5, -6, -8 and -11; the catalog also lists BS EN/EN 61000-6-1 with BS EN/EN 50082-2 in parentheses, light-industry level, criteria A.
    System integration The controller is a component. Catalog EMC tests cover the controller alone without connected control equipment; reconfirm EMC compliance in the final assembled equipment.
    MTBF reference 690,300 hours minimum per Telcordia TR/SR-332; 78,900 hours minimum per MIL-HDBK-217F at 25°C. These are reliability estimates, not a guaranteed service life.

    Dimensions and mounting

    Parameter Details
    Dimensions 483.6 × 66.3 × 132 mm (L × W × H), 3U 19-inch rack-mount format. The drawing separately shows a 14.6 mm projecting rotary control; allow front operating clearance.
    Mechanical drawing Catalog general dimensional tolerance: ±1 mm. Rack slot center spacing is 466.2 mm horizontally and 80 mm vertically; follow the full mounting-slot drawing.
    Mounting Install in a compatible 19-inch rack. Standalone wall, DIN-rail and desktop fittings are not the rack-mount arrangement.
    Mounting accessories The catalog’s DIN-rail bracket and desktop stand are for standalone installations; do not assume they are supplied with or suitable for this rack-mount unit.
    Unit mass 2160 g, catalog packing reference per unit (2.16 kg; 6 pieces / 14 kg / 2.91 CUFT). This is not a separately declared measured net mass.
    Manufacturer warranty reference The catalog states a five-year manufacturer warranty, subject to its applicable terms.

    Manufacturer installation and commissioning instructions

    Parameter Details
    Electrical connection Connect AC input pin 1 to neutral, pin 2 to line and pin 3 (FG) to protective earth. This Class I controller requires a reliable protective-earth connection.
    Installation environment Avoid locations with high moisture, high ambient temperature or direct sunlight. Protect the LCD from sharp tools. Have faults examined by a qualified technician; do not remove the controller case yourself.
    Inverter communication For the NTN-5K application, connect the inverter network through RS-485 using Modbus RTU. Assign each connected inverter a unique address; the CMU2E supports up to 32 device addresses. PMBus is not supported for this application.
    RS-485 connection RS-485 pin 1 is D-/DB, pin 2 is D+/DA, and pins 3 and 4 are FG. Follow the inverter wiring and configuration instructions before commissioning.
    Digital I/O limits Digital inputs and outputs are isolated open-collector signals referenced to FG. Digital outputs have a maximum signal voltage of 5 V. For digital inputs, an open input or +5 V is logic high; a connection to FG or 0 V is logic low.
    Logging and card access Data and event logging require an installed 4–32 GB SDHC card. Follow the model-specific card-access instructions and refit the cover after inserting the card.
    Application compatibility Confirm the supplied extension-card configuration and connected inverter firmware before commissioning. Charging, solar and grid-feeding options apply only when supported by the connected inverter.
    Alarm indication and version The current catalog describes a steady red fault indication, while the CMU2E manual describes a flashing red alarm. Follow the indication guidance for the supplied controller version.
    Rack mounting Install the rack-mount version using M5 × 12 mm screws as shown in the dedicated mounting diagram. The standalone DIN-rail and desktop attachments do not apply to this version.

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