Cummins Power 100kW 125kVA 6BTA5.9-G2 Diesel Generator Set

Cummins Power 100kW 125kVA 6BTA5.9-G2 Diesel Generator Set

This reliable diesel generator set features the proven Cummins 6BTA5.9-G2 turbocharged and aftercooled diesel engine, delivering 100 kW (Prime) / 125 kVA of dependable power at 50 Hz, 400V, 3-phase. Equipped with a high-efficiency alternator and a Deepsea/ComAp control panel, it’s ideal for standby or prime power applications in commercial, industrial, and remote settings. Built for durability, fuel efficiency, and easy maintenance—ready for immediate deployment.

Generator Set Specification

Cummins 6BTA5.9-G2 Diesel Engine Datasheet

The Cummins 6BTA5.9-G2 is a reliable, turbocharged, and aftercooled (T/A) inline 6-cylinder diesel engine designed for industrial and power generation applications. As part of Cummins’ renowned B Series platform, it delivers robust performance, fuel efficiency, and long service life under continuous or standby operation.

 

 

 

Stamford Brushless Alternator Specs

 

The UCI274ES is a high-performance, brushless, self-excited AC alternator from Stamford, designed for reliable power generation in industrial and commercial standby or prime-rated applications. With a robust construction and advanced electromagnetic design, it delivers stable voltage output even under demanding load conditions.

 

Compliant with international standards

Generators are manufactured using production procedures having a quality assurance level to BS EN ISO 9001. The stated voltage regulation may not be maintained in the presence of certain radio transmitted signals. Any change in performance will fall within the limits of Criteria 'B' of EN61000-6-2:2001. At no time will the steady-state voltage regulation exceed 2%

 

Stamford Alternator Model	UCI274ES
Insulation class	H
Winding pitch	2/3 (wdg 6)
Number of wires	12
Protection	IP23
Altitude	≤ 1000 m
Excitation system	SHUNT
AVR type	MX321
Voltage regulation (*)	± 0.5%
Total Harmonic Distortion THD (**) in no-load	< 2%
Total Harmonic Distortion THD (**) on linear load :	< 4%
Waveform: NEMA = TIF (**)	< 50
Total Harmonic THD (**) in linear load	< 5 % according to C.E.I.
Waveform NEMA = TIF (**)	< 50
Waveform I.E.C. = THF (**)	< 2%
Optional	- Filters on air inlet: derating 5%  - Filters on air inlet and air outlet (IP 44): derating 10%  - Winding protections for harsh environments and relative humidity greater than 95%  - Space heaters  - Thermal protection for stator windings  - Steel terminal box

 

 

Advanced Control Panel

The list of equipment and functions given below is not exhaustive.

The equipment must be supplied in working order and fit for the function for which it is intended; it shall allow:

-   Automatic starting,

-   Manual starting,

-   Test position,

-   Complete stop in case of intervention on the set,

-   Monitoring and control of safety functions:

 -   Signalling of faults, optical and acoustic with optical memory for no-start, lack of oil pressure, lack of pre-lubrication, excessive water temperature, excessive oil temperature, overspeed. Failure to start on the first attempt must be signalled so that a check can take place,

 -   Set running signalling: alternator output, normally closed circuit breaker, emergency closed circuit breaker, presence of mains voltage, alternator overload, lack of fuel,

 -   Alternator protection: automatic engine stop,

 -   Remote signalling by dry contacts of any polarity.

-   Set in automatic operation,

-   Set in manual operation,

-   Set in fault,

-   Set out of service:

	Deepsea 6120	Deepsea 7320
Display Language	18	18
Languages can be stored in the module	2	7
RS232 port	-（Not available)	√
RS485 port	■*(*indicates that DSE857 communication module needs to be added.)	√
Ethernet port	■**(**indicates that DSE855 communication module needs to be added.)	■**(**indicates that DSE855 communication module needs to be added.)
Short circuit protection	√	√
Negative phase sequence protection	√	√
Earth fault protection	-（Not available)	√

 

 

Circuit Breaker Specification

Manufacturer	Delixi/Chint
Capacity	250A
Pole	3P

 

Starting Battery Specification

Standard Supply Scope

Optional Supply Scope

FAQ:

What are the maintenance requirements for 125KVA Generator Set ?

✅ Daily / Before Each Use (Operator Checks)

• Check engine oil level – top up if needed.
• Inspect coolant level (if not closed-loop with expansion tank).
• Verify fuel level and check for leaks or water contamination.
• Ensure battery voltage ≥ 24 V (for 24V systems); clean terminals if corroded.
• Confirm no error alarms on the control panel (e.g., Deepsea 6120/DSE7320).

Every 250 Operating Hours (or Every 6 Months – Whichever Comes First)

Change engine oil & oil filter

Replace fuel filters (primary & secondary)

Inspect/replace air filter (clean or replace if clogged)

Check drive belts for tension and wear

Inspect exhaust system for leaks or soot buildup

Test automatic transfer switch (ATS) if installed

Run under load for at least 30–60 minutes (critical for standby units)

Every 500 Operating Hours (or Annually)

Replace coolant (if using conventional coolant; extended-life coolant may last 2–3 years)

Inspect turbocharger (for oil leaks or bearing play)

Check valve clearance (on mechanical engines like 6BTA5.9-G2)

Inspect alternator:

Clean dust from windings (use dry, low-pressure air)

Check terminal tightness

Perform insulation resistance test (megger test >5 MΩ)

Inspect battery: load-test and clean terminals; replace every 2–3 years

Check mounting bolts & anti-vibration pads

Every 1,000–2,000 Hours (or Every 2–3 Years)

Flush and refill cooling system

Inspect/replace hoses and clamps

Test AVR (Automatic Voltage Regulator) functionality

Inspect wiring harness for chafing or heat damage

Perform full load bank test (to prevent wet stacking in diesel engines)

Critical Best Practices

Avoid “no-load” running: Diesel engines should run at least 30–50% load periodically to prevent wet stacking (unburned fuel in exhaust).

Use genuine or OEM-approved parts: Especially for filters, oil, and coolant.

Keep service logs: Record hours, oil changes, repairs, and test results.

For standby generators: Run weekly/monthly under load—even if utility power is stable. 

Typical Consumables for 125 kVA Set (Cummins 6BTA5.9-G2 Example)

Following this maintenance plan will maximize reliability, fuel efficiency, and service life (typically 15,000–25,000+ hours for well-maintained sets).