Click here to view this as a PDF. 


This specification covers the indoor use MITSUBISHI diesel engine generator set  and attached equipment. 

Note 1       For actual voltage and output, refer to the “Scope of supply” sheet

Note 2       Output at 40 deg C , 1000m ASL  with Fan

Note 3       Fuel Consumption at 75% Load

Note 4       Lub. Oil Consumption at 100% Load

Note 5       Fuel Consumption may differ subject to site condition and specification of fuel.

                          Not guaranteed value 



Unit of measurement, weight, and capacity concerning all of the equipment   supplied by us, SI unit and English letter are used. 


Diesel generator test shall be carried out on the following items at the manufacturer's shop. 

(1)   Starting and stopping test. 

(2)   Load test   

(1)   Governor test.

(2)   Insulation and alarm test.

Generator and switchboard test shall be carried out at generator manufacturer's shop. After the test, the test record shall be submitted. 


  1.3 Applicable standard

To be in accordance with JIS, JEC, JEM, IEC and manufacturer’s standards  unless otherwise specified

a)  J.I.S.       : Japanese Industrial Standards

b)  J.E.C.     : Standard of the Japanese Electrotechnical Committee

c)  J.E.M.    : The standard of Japanese Electrical Manufacturers Association 

d)  I.E.C.      : International Electrotechnical Commission

e)  I.S.O.      : International Organization for Standardization



The guarantee shall be valid for the period of twelve (12) calendar months after completion of commissioning test at site or for the period of eighteen (18) calendar months after B/L date, whichever comes earlier. The guarantee shall cover against manufacturer defect, bad materials and workmanship only, and shall not be applicable to damage sustained through mishandling of the equipment and force majeure. The guarantee shall not be liable for any consequential or resultant loss or damage howsoever occurring. The guarantee shall be subject to the proper maintenance of machinery and equipment according to the maintenance schedule to be submitted separately.



Mitsubishi standard (Dark Blue) Munsell 6.0PB 4.4/5.2              



Generator sets are designed under the following operating conditions              

a)  Relative humidity           : Max. 85%      

b)  Ambient temperature     : 40deg.C     

c)  Altitude above sea level  : Below 1000 meters 




2.1 Particulars of diesel engine 

2.2 Engine Instrument

Engine instruments shall be installed in the generator panel.

Engine status are showed by graphical icon and digital indicator on LCD display of  the generator panel.



The brushless AC Generator coupled with the diesel engine and installed onto  a common bed.

The AC Generator provided the following characteristics.       


   3.1 Particulars of the AC Generator                                                

(1) Standard specification 

3.2 Characteristics (AC Generator) 

(1)   Steady state voltage regulation

Voltage Regulation will be ± 0.5% when the load  varies between no load and full load at power factors between 0.8 and  1.0 over a prime mover speed range of 4%.  

(2)   Transient Response  

The Instantaneous Voltage Regulation will be within 25% and recoverable to  within 3% of the final steady-state voltage in not more than 1sec., when full  load at a power factor of 0.4 or less is suddenly applied to the AC Generator  running at no load and rated frequency. However engine response may  influence on recovery time.

(3)   Voltage wave form 

The wave form deviation of phase to phase voltage, as checked at the  AC Generator terminals, is not greater than 5% at no-load rated voltage.

(4)   Unbalanced loading

An acceptable value of negative phase sequence current is approximately 8%  of rated current. Up to 25% load imbalance can be tolerated on a continuous  basis. 

(5)   Temperature rise limits 

The main windings of the AC Generator are designed for operation to Class H  temperature rise limits.

(6)   Insulation strength 

The dielectric strength of the winding insulation system is checked during  manufacture by conducting a High Voltage withstand test. 

Main Stator winding : AC 2000V        Main Rotor winding: AC 1500V 

(7)   Overspeed 

The AC Generator is capable of withstanding overspeeds to 125% of the rated  speed for two minutes under no load.

(8)   Voltage adjustment is typically ± 6% using a remotely connected trimmer.

(9)   Terminal box

The large fabricated sheet steel terminal box mounted on the AC Generator  accommodates load output terminals and access cover.



                4.1 General

Automatic start engine management and instrumentation system module  in fabricated cubicle is installed on individual bracket with anti-vibration isolator.

   4.2 Instruments and control accessories Instruments are graphical icon on LCD display

a)     Generator running indicator

b)     Voltage adjuster 

c)     Frequency adjuster 

d)     Emergency stop switch

e)     Selector switch (STOP / RESET ,  ACTIVE ,  PANEL LOCK)

f)      Manual start button

g)     Manual stop button

h)     Common alarm indicator

i)       Transfer to generator button (manual mode only)

j)       Transfer to main button (manual mode only)

k)     Mute alarm button

l)       Manual Mode button

m)    Auto Mode button

n)     Menu navigation buttons

o)     Alarm indication on LCD (see 4.3)

p)     Status indicator (see 4.5)

q)     Value display on LCD


1)    Frequency / RPM

2)    AC voltage phase  

3)    AC voltage phase-phase 

4)    AC Line Current

5)    Oil pressure

6)    Coolant temperature

7)    Oil temperature λ

8)    Engine hours run

9)    DC battery voltage

10)  Generator frequency

11)  Generator load / kW

12)  Generator load / kVA

13)  Power factor / pf

14)  Generator load / kVAr

15)  Generator load / kWh, kVAh, kVarh  

16)  Generator phase sequence

17)  Generator Nominal

18)  Exhaust gas temperature  λ

19)  Winding temperature (U,V,W)  λ

20)  Bearing temperature  λ

These values shall be displayed on the alarm box adjacent to MGS7310GCP λ Optional item upon request


4.3 Fault operation

    Fault operations shall be provided as follows:

NOTE :            1. “×” marks are applicable items.

2.   ” marks are not applicable items.

3.   Eng stop by Electrical trip signal will be done after Eng cooled.

4.   Regarding , in case of “Prime” duty, that value is 150

5.   Regarding **,in case of “Prime” duty that value is 110%

6. Regarding ***,in case of “Prime” duty that value is 115%.

     7. Optional items installed upon request.


4.4 Auxiliary input signals

If the functions as follows are necessary, please input external command signals  to the control panel.

(1)  Remote start/stop

(2)  Electrical trip

(3)  CB close status (Generator closed auxiliary) 


   4.5 Status indicator

(1)  Remote start present 

(2)  Generator ready 

(3)  LO filter clogged 

(4)  Electrical trip 


   4.6 Auxiliary output signals

These signals are output from control panel as 24V DC.

(1)          COMMON Shutdown alarm signal (for CB Trip)

(2)          kW Overload alarm

(3)          Low speed detection 

(4)          CB close command (pulse)

(5)          CB open command (pulse)

(6)         AUTO Mode

(7)          Common Electrical Trip 

(8)          Energize to stop 

(9)          Common warning 

(10)       Failed to start alarm 

(11)       Over speed shutdown 

(12)       Emergency stop 

(13)       Low oil pressure 

(14)       High water temperature 

Require optional 2157 relay unit


   4.7 Operation

Generator control panel has three positions of key switch.

Each position is written in below. 

 STOP / RESET: Engine stop and controller reset operation are available.              

 ACTIVE: Auto and manual mode can be selected by auto and manual button on controller.

 PANEL LOCK : Even if auto or manual button is pushed, mode selection is not applicable.     


Engine start and stop shall be done by operator. When engine trouble occurred  engine should be stopped by generator panel automatically.

Remote start and stop control are available, when auto mode is selected by auto mode button.



   5.1 Fuel system

Fuel to meet ASTM D975 grade No.2-D or BS2869 class A or JIS K-2204.


Fuel tank and fuel pipes to be free of dirt, water or other foreign substances.

   5.2 Cooling system

Coolant to meet the coolant specifications. (APPENDIX-2)

   5.3 Lubrication system

Engine oil to meet API service classification CD or CF. (APPENDIX-3) Do not use CE and CF-4 lube oils for Mitsubishi high-speed diesel engines.


- End of Specification -




Limiting Requirements for Mitsubishi Diesel Fuel oils 

APPENDIX-2 Coolant Specifications

APPENDIX-3 Recommended Lubricating Oil