MSU 5.1
Manual Start Units - MSU Series

High performance with friendly user interface. Powerful program menu for enhanced control applications

MSU 5.1 provides embedded intelligence for Gen-Set control applications where high integration flexibility and "on-site" system monitoring is required.

MSU 5.1 is designed with enhanced applications in mind and equipped with all the necessary hardware and software to fulfill this demand. The unit is equipped with an ARM Processor for high performance. All the Mains and Generator parameters are measured, processed and executed simultaneously, which in return allows enhanced functions for single and multiple Gen-Set applications. System hardware allows the user to interface with high demanding applications, where high number of peripheral c... »

MSU 5.1 is designed with enhanced applications in mind and equipped with all the necessary hardware and software to fulfill this demand.

The unit is equipped with an ARM Processor for high performance. All the Mains and Generator parameters are measured, processed and executed simultaneously, which in return allows enhanced functions for single and multiple Gen-Set applications.

System hardware allows the user to interface with high demanding applications, where high number of peripheral control is required. The system software also carefully designed in order to allow dedicated functions to be characterized for a particular application. Simple logic functions can also be executed on the auxiliary inputs and outputs, hence reducing the number of peripheral instruments.

The controller is equipped with multiple communication ports for enhanced interface with external control systems. RS232/485 can be used for on-site system configuration as well as remote control and monitoring of the system while integrated CAN Bus can communicate with engine ECU module. The system can also be interfaced with ENKO external i/o expansion modules for applications where specific dedicated hardware control is needed.

Front panel design includes 3 analog displays for Engine temperature, Oil pressure and Fuel level indication. Functions can be made to operate on these measured analog values. In the standby mode, the unit can also measure and control the engine body temperature. The load can be controlled both manual and automatic, where both MCB and GCB contactors can be controlled from the front panel.

The system can be used for multiple Gen-Set applications, where one can be selected to be master and allow to control the others as slave units. MSU5.1 allows remote programming, monitoring and GSM interface with any external control system.




  • 5 LED displays and 3 analog bar graph displays
  • LED alarm indicators on front panel
  • Full control and protection of diesel engine and alternator
  • 8 digital input ports (all configurable)
  • 3 analog input ports
  • 6 digital output ports (4 configurable, all outputs dry contact relay)
  • Automatic, Test and Manual operation modes
  • 3 phase Generator voltage and current sensing
  • Automatic or manual control of the GCB relay
  • Measurement of KW, KVA, KVAr, KWh and Power Factor
  • TrueRMS measurements ensure best accuracy
  • Engine pre-heat function
  • RS232/485 ModBUS RTU protocol can be used for remote monitoring and programming
  • SMS messaging function (GSM modem required)
  • Manual and remote start
  • Full digital calibration on all analog measuring inputs
  • PC interface for monitoring and system programing, SCADA control
  • CAN and magnetic pick-up for RPM sensing
  • Characteristic adaptation table for temperature and pressure sensors
  • Remote start and stop interface
  • 6 engine and 6 maintenance timers
  • Real-time clock
  • Date and time stamped event log (Last 50 events)
  • Date and time stamped alarm log (Last 30 alarms)
  • AT+T compatible modem interface
  • TTL communication port
  • Isolated RS485 communication port
  • CanBUS / J1939 communication port
  • Remote monitoring function
  • Phase sequence detection
  • Reverse power protection
  • Earth current measurement
  • Programmable weekly / monthly run schedule
  • Automatic alarm acknowledge function via menu programming
  • Electronic engine compatible (ECU communication)
  • Earth leakge measurement
  • Wide operating temperature range (-35C to +70C)
  • IP 52 front panel protection
  • 3 level password protection and user types ensure the user and the technical expert access the appropriate parameters
  • Easily receive information regarding the status of the Generator and view/edit parameters by sending receiving SMS messages
  • Option to configure parameters using the front panel or via licence-free ENKO Pro-Link Configuration Suite PC software
  • Built-in dedicated functions for specific applications like Telecom
  • Internal relay outputs eliminate the need for external relay use
  • Five LED displays allow seamless operation under harsh temperature conditions
  • Remote start / stop interface allows the controller to be used from distance
  • The time and date stamped alarm and event logs allow easier and faster troubleshooting and maintenance
  • Program weekly / monthly work schedules to test or simply maintain the Generator
  • Earth current measurement allows the calculation of loss due to earth current leakage
  • ECU communication can be made through the CanBUS / J1939 and pre-loaded engine configurations allow easy set-up
  • Configurable I/O ports provide custom solutions for different applications and can be easly programmed via selecting from hundreds of pre-loaded functions


DC Supply (Power Supply)

  • DC Supply Voltage :
    9 - 35 Vdc
  • Maximum Operating Current :
    For 12V Systems    mA
    For 24V Systems    mA
  • Stand-by Operating Current :
    For 12V Systems     mA
    For 24V Systems     mA
  • Cranking Dropouts :
    Able to withstand dopouts during cranking




  • Digital Display Type :
    5 Displays with 3 Digit 7 Segment LED's
    3 Analog Bar-graph Displays for Analog Inputs
  • Information Shown on Digital Display :
    Generator Voltage and Frequency (Phase-Phase and Phase-Neutral)
    Current, Earth Current, KW, KVA, KVAr, KWh and Power Factor
    RPM, Battery Voltage, Charge Alternator Voltage
    Coolant Temperature, Oil Pressure and Fuel Level
    Engine Running Hours, Maintenance Timers

  • Alarm & Event Log :
    Time Stamped Last 50 Alarms are Logged
    Time Stamped Lats 30 Events are Logged
  • LED Indicators :
    Mimic Diagram
    15 Failure and Mode LED Indicators

Generator Voltage / Frequency Measurement

  • Measurement Type and Source :
    True RMS 3 Generator Voltage Inputs
  • Phase-Neutral Voltage Measurement Range :
  • Phase-Phase Voltage Measurement Range :
    20 - 500 Vac
  • Voltage Measurement Accuracy :
    +/- 2% of the Scale
  • Voltaj Measurement Resolution:
    1.0 V
  • Frequency Measurement Range:
  • Frequency Measurement Accuracy :
    +/- 0.1Hz
  • Frequency Measurement Resolution :
    0.1 Hz


Current Measurement


  • Measurement Type : 
    3 Phase True RMS and Earth Current
  • Current Transformer Seconder Ratio :
    The Primer and Seconder Ratios are x/5A
  • Measurement Accuracy :
    +/- 1%
  • Measurement Resolution :
    1.0 A

Digital Inputs

  • Digital Inputs  :
    8 Digital Inputs
  • Configurable Inputs :
    6 Configurable Inputs
  • Operation Type :
    The Desired Polarite can be Selected Depending on the Common Terminal
    The Common 1 is for Aux. Input 1, 2, Oil Pressure and Temperature Inputs
    The Common 2 is for Aux. Input 3, 4, 5 and 6

Analog Inputs


  • Analog Oil Pressure Measurement Type :
  • Analog Oil Pressure Measurement Accuracy :
    +/- 1%
  • Analog Oil Pressure Measurement Resolution :
    0.1 Bar
  • Analog Coolant Temperature Measurement Type :
  • Analog Coolant Temperature Measurement Accuracy :
    +/- 1%
  • Analog Coolant Temperature Measurement Resolution :
    0.1 ºC
  • Analog Fuel Level Measurement Type :

  • Analog Fuel Level Measurement Accuracy :
    +/- 1%

  • Analog Fuel Level Measurement Resolution :
Charge Failure Input


  • Voltaj Range :
    0 - 35 V
  • Excitation Current :
    For 12V Systems 80mA
    For 24V Systems 120mA
  • Measurement Accuracy : 
    +/- 1%
  • Measurement Resolution :

Magnetic Pick-up Input (MPU, RPM)


  • Measurement Accuracy :
    +/- 5 RPM
  • Measurement Resolution :
    1 RPM


  • Generator Contactor :
    1 Output 10A 250Vac Relay
  • Crank and Fuel :
    2 Outputs 16A 250Vac Relay
  • Configurable Aux. Outputs :
    4 Outputs 6A 250Vac Relay



  • Communication Ports :
    1 TTL Communication Port
    1 RS485 Communication Port
    1 CANBus 2.0b (J1939)
  • GSM/GPRS Support :
    Yes (Requires External Modem)
  • PC Connectivity : 
    Yes (Requires External Cable)
  • ModBUS RTU Support :
    Units Such as PC, PLC and Other Smart Units are Supported Through ModBUS RTU with Accessories.
  • Prolink SCADA Support :
  • I/O Expansion Module Support :


Real-time Clock

  • Real-time Clock :

  • Internal Battery Support :

Environmental Conditions


  • Operating Temperature and Humidity Range :
    -35ºC to +70ºC
    20%rH to 99%rH, Non-condensing
  • Storage Temperature and Humidity Range :

  • ESD Protection :

  • EMC Conformance :

  • EMI Conformance :

  • Vibration :

  • Protection Class :
    IP 52 Front Panel Protection


Mechanical Specifications


  • Dimensions 
    192 mm x 144 mm x 62 mm
  • Panel Cut-out :
    185 mm x 138 mm
  • Weight : 
    840 gr (Average)
  • Mounting Type :
    Panel Mount with Metal Screw Fixings
    Maximum Panel Thickness 3mm
There is no software added yet.
  • Which models have electronic engine capabilities?

    Today most Electronic Engines comunicate over CanBUS protocol (some engines like Cummins communicate over ModBUS), thus the control panel should contain a CanBUS communication port in order to support Electronic Engines. ENKO has 4 models which support CanBUS communication which are AMF 5.1, AMF 5.2, MSU 5.1 and the MSU 5.2. For detailed information on these models please visit the products page.

    In the case where the Engine Control Unit communicates over ModBUS protocol, a panel with an RS485 port will be suffucient for communication with the engine. Please check the engine manufacturers user manual to see which protocol the ECU communicates with. 

  • What are the requirements for configuring the AMF/MSU series controllers via ENKO PC Configuration Suite?

    In order to connect an AMF/MSU controller to the PC, a TTL/USB convertor cable which can be ordered from ENKO is required. Besides the convertor cable the Configuration Suite will require Microsoft .Net Framework 4.0 or better to be installed first. This is a licence free software and can easily be installed from website or can be installed from the ENKO PC Configuration Suite (Just click yes when prompted during installation).

    The ENKO PC Configuration Suite can be downloaded from our website. Just visit the Software tab on the related product page.

    Models currently supported by the PC Configuration Suite are AMF 3.1, AMF 3.2, AMF 3.4, AMF 3.4L, AMF 5.1, AMF 5.2, MSU 3.1, MSU 3.4L, MSU 5.1 and MSU 5.2.

  • The MCB and GCB buttons on the panel are not functioning. Why?

    The MCB and GCB control is provided on the front panel. These buttons are designed in two different ways. In the AMF 3.4L, AMF 5.1, AMF 5.2, MSU 3.4L, MSU 5.1 and MSU 5.2 models, there are dedicated contactor open and contactor close buttons for the MCB and/or GCB. On the other hand the AMF 3.1, AMF 3.2, AMF 3.4, AMF 4.2, AMF 5.1, MSU 3.1, MSU 3.2, MSU 3.4, MSU 4.2 and MSU 5.1 models these buttons are designed as toggle buttons. 

    The MCB and GCB control buttons will NOT function in AUTO mode. This mode is where the AMF/MSU panel has the control of the contactors and therefore the MCB/GCB buttons are disabled. In order to take control of the MCB and GCB contactors the user must take the AMF/MSU panel into MAN or TEST mode. The contactor buttons will function only in these modes. 

    Another reason why the buttons may not be functioning is the connection mistakes. Please check and make sure the contactors have been connected to the corresponding terminals on the AMF/MSU panel. In order to obtain the connection diagram, please check the Documents tab in the related product page or check the User Manual.