General Information
Generator
This MQ Power generator (Figure 3) is 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 control Panel
The “Engine Operating Panel” is provided with the following: Engine Warning Lamp Module
•Oil Pressure Alarm Lamp
•Water Temperature Lamp
•Charging Alarm Lamp
•
Fuel Gauge
Hour Meter
Speed Control Switch
Ignition Switch
generator Control Panel
The “Generator Control Panel” is provided with the following: Frequency Meter (Hz)
AC Ammeter (Amps)
AC Voltmeter (Volts)
Ammeter
“Control Box” (located behind the Gen. Control Panel)
•Automatic Voltage Regulator
•Current Transformer
•
•Starter Relay
•Voltage Selector Switch
Output Terminal Panel
The “Output Terminal Panel” is provided with the following: Two 250 VAC output receptacles
Options
Battery Charger
Water Heater
Low Coolant Level Switch/Indicator
Camlock Connectors
Open Delta Excitation System
This generator is equipped with the state of the art “Open- Delta” 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
Engine
This generator unit incorporates an Kubota
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 (OPTION)
The electric governor system controls the RPMs of the engine. 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.
page 16 — DCA40sskU/ku4i 60 hz Generator • operation and parts manual — rev. #1 (03/11/13)
