DCA-25USIXF/DCA-25USI2XF— GENERAL INFORMATION
FAMILIARIZATION
Generator
The MQ Power
Engine Operating Panel
The “Engine Operating Panel” is provided with the following:
Tachometer
Water Temperature Gauge/ Alarm Lamp
Oil Pressure Gauge/ Alarm Lamp
Charging Ammeter Gauge
Panel Light
Panel Light Switch
Ignition/Preheat Switch
Fuel Gauge
Fuel Filter Water Level Alarm Lamp
Fuel Leak Detected Alarm Lamp
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
Output Terminal Panel
The “Output Terminal Panel” is provided with the following:
Two 250 VAC output receptacles
Two auxilliary circuit breakers, 250V @50 amps
Two 125 VAC output receptacles, (GFCI), 20 amps
Two GFCI circuit breakers, 125V@ 20amps
Five output terminal lugs (3Ø power)
Control Box
The “Control Box” is provided with the following:
Automatic Voltage Regulator
Current Transformer
Emergency Relay
Open Delta Excitation System
This generator is equipped with the state of the art
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 fromtheparallelconnectionsofAtoB,AtoD,andCtoD.Thesethree phases of the voltage input to the voltage regulator are then rectified and are the excitation current for the exciter section.
Whenaheavyload,suchasamotorstartingorashortcircuitoccurs, 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 ot 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
These generator’s are powered by two different types of diesel engines depending on the model of the generator. Both engines are 4 cycle, water cooled, direct injection types. The DCA25USIXF incorporates an ISUZU
InkeepingwithMultiquip'spolicyofconstantlyimprovingitsproducts, the specifications quoted herein are subject to change without prior notice.
The basic controls and indicators for the generator are addressed on the following pages.
Mechanical Governor System
The mechanical governor system control the RPM of the engine. When the engine demands increase or decrease, the mechanical governor system regulates the frequency variation to ±.5%. The electronic governor option increases frequency variation to ±0.25%.
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.
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