PAGE 72 — GENERATOR SERVICE AND TROUBLESHOOTING MANUAL — REV. #0 (08/29/23)
DEFINITIONS
Ammeter — An instrument for measuring the magnitude
of an electric current.
Amperage (Amps) —The strength of an electrical current
measured in amperes.
Armature — That part of a generator or of an electric
motor in which a current is induced by a magnetic eld.
The armature usually consists of a series of coils or groups
of insulated conductors surrounding a core of iron. See ??
for more information.
Automatic Voltage Regulator (AVR) — Increases or
decreases exciter current for a more linear voltage and
frequency.
Brushless Design —The purpose of the generator brush is
to absorb power from the rotating armature of a generator
and supply it to the stationary part of the generator. These
brushes have a short life due to erosion. Multiquip’s unique
brushless design calls for lower maintenance and a longer
generator life. See open delta page ?? for more detailed
information.
Circuit Breaker (CB) — A mechanical switching device
capable of making, carrying, and breaking currents under
normal circuit conditions and also making, carrying for a
specic time, and automatically breaking currents under
specied abnormal circuit conditions such as those of
short circuit.
Controller — Starts and stops the generator. In addition it
monitors the following engine operating parameters:
• Low Oil Pressure
• High Coolant Temperature
• Overcrank Shutdown
• Overspeed Shutdown
• Engine Running
Diode — A device which allows current to pass in one
direction only. It may be used as a rectifying element.
ECM — Commonly referred to as the Engine Control
Module. This module is provided by the engine
manufacturer. Its main purpose is regulating fuel to meet
emission standards.
Exciter — A device for supplying excitation to the generator
eld. It may be a rotating DC, AC with rectiers, or a static
device converting AC to DC.
Frequency (Hz) — Frequency is the number of complete
cycles per second in alternating current direction. The
standard unit of frequency is the hertz, abbreviated Hz. If a
current completes one cycle per second, then the frequency
is 1 Hz; 60 cycles per second equals 60 Hz.
Ground Fault Interrupter (GFCI) — GFCIs are a protective
device specically designed to break the circuit every time
there is an imbalance between incoming and outgoing
current.
The GFCI receptacle protects electrical wiring from
overheating and possible re, greatly minimizing the risk of
shock injuries and fatal burns. It also detects ground faults
and disrupts the ow of current but should not be used to
replace a fuse as it does not offer protection against short
circuits and overloading.
Heat Rise — Is in direct relation to the longevity of the
generator. Reference the heat rise section in this manual
to understand MQ Power-designed generators are the
leader in the industry.
Kilovolt-Ampere (kVA) — Is equal to 1,000 volt-amperes.
Electrical power is measured in watts (W): The voltage
multiplied by the current measured each instant. In a
direct-current system or for resistive loads, the wattage
and VA measurements will be identical.
Kilowatt (kW) — A kilowatt is a unit of power. One kilowatt
is equal to one thousand watts.
Megohmmeter — An electric meter that measures very
high resistance values by sending a high-voltage signal
into the object being tested. This type of meter provides a
quick and easy way to determine the condition (resistance)
of the insulation on wires, generators, and motor windings.
NEMA — National Electrical Manufacturers Association, a
nonprot trade association supported by the manufacturers
of electrical apparatus and supplies. NEMA is engaged in
standardization to facilitate understanding between the
manufacturers and users of electrical products.
For more information about NEMA and their standards,
visit their website at http://www.nema.org/.
Ohm (W) — Unit of electrical resistance. One volt will
cause a current of one ampere to ow through a resistance
of one ohm.
Ohmmeter — A device for measuring electrical resistance.
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