Pramac GSW1270m 1270 kva generator set

Generating set equipment

The frame is made of steel profile complete with anti-vibration supports suitably dimensioned.

The bodywork is soundproof and consists of modular panels, covered with galvanized steel with anti-corrosion and adverse conditions treatment, duly fixed and sealed, in order to obtain a completely waterproof receptacle.

It has easy access to the generator set for maintenance purposes thanks to side access doors fixed by stainless steel hinges and perforated galvanized steel interior. It also includes removable panels with screw holes protected by a plastic cover. In addition, the control panel protection door is provided with a suitable window and lock.

It consists of a suitably protected and soundproofed side air inlet opening and an exhaust air outlet in the roof, rain gutter protected by a suitable grille.

Complete soundproofing is achieved thanks to the sound-absorbing material with acoustic insulation and the efficient residential muffler placed inside the bodywork.

Engine specifications

Fuel system:

• Direct fuel injection system, fuel lift pump
• Fuel cooler
• Closed fuel system

Lube oil system:

• Low oil pressure switch
• Wet sump with filler and dipstick
• Lube oil filters
• Oil cooler with separate filter head

Combustion air system:

• Exhaust turbochargers
• Dry-type air cleaner assembly with contamination indicator
• Intake air depression (max. at fuel power): 22 mbar

Cooling system:

• High coolant temperature switch
• Twin thermostats, water pump
• System designed for environments up to 50°C
• Radiator with air-to-air charge cooler

Alternator specifications

Mechanical structure

Robust mechanical structure allows easy access to connections and components for routine maintenance.

Voltage regulator

• Voltage regulation provided by DER1: based on the DSP (Digital signal Processor) system, it consists of a digital regulator that combines the functions of Voltage Regulator and Alternator Diagnostics and Protection incorporated in a small control card.
• Supply voltage: 40Vac÷270Vac
• Maximum output current: 4A dc. Frequency range: 12Hz÷72Hz.
• Single-phase automatic recognition sensor. Average voltage regulation value.
• Voltage regulation range sensor from 75Vac to 300Vac.
• Voltage regulation accuracy: ± 1% without nominal load up to its nominal load, in stationary conditions, against any power factor and for frequency variations between 5% and +20% of the nominal value.
• Voltage regulation accuracy: ± 0.5% under stabilized conditions (load and temperature).
• Voltage drop and overvoltage within ± 15%.
• Voltage stabilization time within ± 3% of nominal value in less than 300 msec.
• Under speed protection with adjustable parameters and limits.
• Overvoltage and undervoltage alarm. Excitation overcurrent protection with time delay.
• Storage of alarm conditions (type of alarm, number of events, duration of last event, total time).
• Memorization of the regulator operating time.

Wiring / excitation system

The generator stator is wound in 2/3, thus eliminating triple harmonics (3rd, 9th, 15th ...) in the voltage waveform. This optimal design avoids problems in the supply of non-linear loads. The 2/3 winding design avoids excessive neutral currents present in larger windings.

MAUX: The MAUX MeccAlte auxiliary winding is an independent winding that feeds the regulator. Thanks to this winding it is possible to withstand an overload of 300% of the rated current (maintaining the short-circuit current) for 20 seconds. This is very important for motor starting requirements.

Insulation impregnation

The insulation is standard class H. Impregnation is done with premium epoxy resins bonded by dipping and dripping. High voltage parts are vacuum impregnated, so that the insulation level is always very good. In high-power models, the stator windings undergo a second insulation process. Gray protection is applied on the main stator exciter in order to achieve higher protection.