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OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
Chapter 1. Description / Operation
Section 1. Description
General
1.
The basic generator set covered in this manual is manufactured by Hobart Brothers Company, Ground
Power Division, in Troy, Ohio. It is rated at 90 KVA and is designed to produce and deliver
115/200-volt, 400 Hz, 3-phase AC power to a parked aircraft or to Hobart approved test banks only.
Series 500392 consists of the following part numbers:
Part Number 500392-001 identifies a single output unit structured* for trailer mounting.
Part Number 500392-002 identifies a dual output unit structured* for trailer mounting.
Part Number 500392-003 identifies a single output unit structured* for fixed/truck mounting.
Part Number 500392-004 identifies a dual output unit structured* for fixed/truck mounting.
Part Number 500392-005 identifies a single output trailer mounted unit similar to 500392-001. A
list of other features that make the 500392-005 unique is located with the Appendix in the back
of this manual.
*In this manual, part numbers 500392-001 and 500392-003 are identical (single output) units.
Part numbers 500392-002 and 500392-004 are identical (dual output) units. The difference
between the units are the options available for them. For example, a fixed/truck mounting kit is
not available for part numbers 500392-001 or 500392-002. See Appendix A.
Orientation
2.
For purpose of orientation, the radiator is considered to be at the REAR of the unit. The generator and
controls are at the FRONT. RIGHT and LEFT are determined by standing at the REAR end facing the
machine. Thus, the control box is mounted on the LEFT side at the FRONT of the unit.
Optional Equipment
3.
Chapters 1 through 5 of this Operation and Maintenance Manual identifies only the "strip down" version
of the 90CU24 generator set. A list of optional equipment which make this manual unique to the
generator set that you have purchased, appears in Appendix A. A few items included in Appendix A
are cable trays, trailers, 28-volt DC power transformer-rectifiers, etc.
Special Features
4.
The generator set has special features in which are described more fully under assemblies in which
they appear. Three features, protective monitor, voltage regulator, and electric governor are mentioned
here and described briefly.
a. Protective Monitor
The protective monitoring system receives signals from the fault sensing units in the generator
output circuit and functions to cause the load to be disconnected from the generator if an abnormal
condition of voltage, frequency, or load develops.
b. Voltage Regulator
A microprocessor-type, adjustable voltage regulator provides automatic voltage regulation at the
aircraft. The regulator is also adjustable for a variety of output cable sizes and lengths.
November 27/1997
Chapter 1-1
Page 1
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