GENERAL INFORMATION
Generator
The MQ Power Model
(Figure 5) that is designed as a high quality portable (requires a trailer for transport) power source for telecom sites, lighting facilities, power tools, submersible pumps and other industrial and construction machinery.
Engine Operating Panel
The “Engine Operating Panel” is provided with the following:
■Tachometer
■Water Temperature Gauge
■Oil Pressure Gauge
■Charging Ammeter Gauge
■Fuel Level Gauge
■Engine Speed Switch
■Auto ON/OFF Engine Controller (MPEC)
■Preheat Lamp
■Warning Lamp
■Emergency Stop Lamp
■Emergency Stop Button
■Diagnostic Gauge
■Panel Light/Panel Light Switch
Generator Control Panel
The “Generator Control Panel” is provided with the following:
■Frequency Meter (Hz)
■AC Ammeter (Amps)
■AC Voltmeter (Volts)
■Ammeter
■Voltmeter
■Voltage Regulator
■
■“Control Box” (located behind the Gen. Control Panel)
■Automatic Voltage Regulator
■Diagnostic Display
■Current Transformer
■
■Voltage Rectifer
■Starter Relay
■Engine Controller (Computer Controlled)
■Voltage
Output Terminal Panel
The “Output Terminal Panel” is provided with the following:
■Three 120/240V output receptacles
■Three auxilliary circuit breakers, 50A
■Two 120V output receptacles (GFCI), 20A
■Two GFCI circuit breakers, 20A
■Five output terminal lugs (3Ø power)
■Battery Charger (Optional)
■Water Heater (Optional)
Open Delta Excitation System
The
the art " " excitation system. The open delta system consist of an electrically independent winding wound among stationary windings of the AC output section.
There are four connections of the open delta A, B, C and D. During steady state loads, the power from the voltage regulator is supplied from the parallel connections of A to B, A to D, and C to D. These three phases of the voltage input to the voltage regulator are then rectified and are the excitation current for the exciter section.
When a heavy load, such as a motor starting or a short circuit occurs, the automatic voltage regulator (AVR) switches the configuration of the open delta to the series connection of B to C.This has the effect of adding the voltages of each phase to provide higher excitation to the exciter section and thus better voltage response during the application of heavy loads.
The connections of the AVR to the AC output windings are for sensing only. No power is required from these windings.
The
excitation does not have a " " and responds according the demands of the required load.
Engine
The
. This engine is designed to meet every performance requirement for the generator. Reference Table 1 for engine specifications.
In keeping with MQ Power's policy of constantly improving its products, the specifications quoted herein are subject to change without prior notice.
Electric Governor System
The electric governor system controls the RPMs of the en- gine. When the engine demand increases or decreases, the governor system regulates the frequency variation to ±.25%.
Extension Cables
When electric power is to be provided to various tools or loads at some distance from the generator, extension cords are normally used. Cables should be sized to allow for distance in length and amperage so that the voltage drop between the generator and point of use (load) is held to a minimum. Use the cable selection chart (Table 6) as a guide for selecting proper extension cable size.
