Multiquip DCA150SSVU - Manual (Page 22)

PAGE 22 — DCA-150SSVU— OPERATION AND PARTS MANUAL (STD) — REV. #1 (06/03/03)
DCA150SSVU — GENERAL INFORMATION
DCA-150SSVU Familiarization
Generator
The MQ Power Model DCA-150SSVU is a 96 kW generator
(Figure 4) 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:
z Tachometer
z Water Temperature Gauge
z Oil Pressure Gauge
z Charging Ammeter Gauge
z Fuel Level Gauge
z Engine Speed Switch
z Coolant Level Alarm Lamp
z Panel Light
z Panel Light Switch
z Auto ON/OFF Engine Controller
Generator Control Panel
The “Generator Control Panel” is provided with the following:
z Output Voltage Adjustment Knob
z Frequency Meter (Hz)
z AC Ammeter (Amps)
z AC Voltmeter (Volts)
z Ammeter Change-Over Switch
z Voltmeter Change-Over Switch
z Voltage Regulator
z Over-Current Relay
Output Terminal Panel
The “Output Terminal Panel” is provided with the following:
z Three 250 VAC output receptacles (CS-6369), 50 amps
z Three auxiliary circuit breakers, 250V @50 amps
z Two 125 VAC output receptacles, (GFCI), 20 amps
z Two GFCI circuit breakers, 120V@ 20amps
z Five output terminal lugs (3Ø power)
Control Box
The “Control Box” is provided with the following:
z 3-Pole, 400 amp Main Circuit Breaker
z Automatic Voltage Regulator
z Current Transformer
z Emergency Relay
Open Delta Excitation System
The DCA-150SSVU 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 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 open-delta design provides virtually unlimited excitation
current, offering maximum motor starting capabilities. The
excitation does not have a "
fixed ceiling" and responds
according the demands of the required load.
Engine
The DCA-150SSVU is powered by a 4 cycle, water cooled,
turbocharged Volvo Model TAD720GE
diesel engine. 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.
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 in-
creases 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 5) as a guide
for selecting proper extension cable size.