MQ Power MQ POWER WhisperWatt DCA70USI, Operation And Parts Manual

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DCA-70USI (60 Hz) — OPERATION AND PARTS MANUAL — REV. #0 (01/04/06) — PAGE 21
1
DCA-70USI (60 Hz) — GENERATOR CONTROL PANEL
The definitions below describe the controls and functions of the
DCA-70USI (60 Hz)
Generator Control Panel (Figure 6).
1. Main Circuit Breaker – This three-pole, 175A main
breaker is provided to protect the the U,V, and W Output
Terminal Lugs from overload.
2. Frequency Meter – Indicates the output frequency in
hertz (Hz). Normally 60 Hz.
3. AC Ammeter – Indicates the amount of current the load
is drawing from the generator per leg selected by the
ammeter phase-selector switch.
4. Ammeter Change-Over Switch – This switch allows
the AC ammeter to indicate the current flowing to the
load connected to any phase of the output terminals, or
to be switched off. This switch does not effect the
generator output in any fashion, it is for current reading
only.
5. AC Voltmeter – Indicates the output voltage present at
the U,V, and W Output Terminal Lugs .
6. Voltmeter Change-Over Switch – This switch allows
the AC voltmeter to indicate phase to phase voltage
between any two phases of the output terminals or to
be switched off.
7. Voltage Regulator Control – Allows ±15% manual
adjustment of the generator’s output voltage.
Located behind the generator control panel is the Generator
Control Box . This box contains some of the necessary
electronic components required to make the generator
function.
The Control Box is equipped with the following major
components:
■ ■
■ ■
■
Over-Current Relay
■ ■
■ ■ ■
Automatic Voltage Regulator (AVR)
■ ■ ■ ■ ■
Starter Relay
■ ■ ■ ■ ■
Current Transformer
■ ■
■ ■ ■
Voltage Selector Switch
■ ■ ■ ■ ■
Three Phase Circuit Breaker
Figure 6. Generator Control Panel
Remember the
overcurrent
relay monitors the current
flowing from the U,V, and W
Output Terminal Lugs
to the
load.
In the event of a short circuit or over current condition, it will
automatically trip the 175 amp main breaker.
To restore power to the Output Terminal Panel , press the
reset button on the overcurrent relay and place the main
circuit breaker in the closed position ( ON ).
NOTE