TM 11-6125-240-12
CHAPTER 1
INTRODUCTION
Section I. GENERAL
1-1. Scope
b. Report of Packaging and Handling Defi-
This manual describes the operation of Motor-Genera-
ciencies. Fill out and forward DD Form 6 (Packaging
tor PU-545/A, as well as its operator and organizational
Improvement Report) as prescribed in AR 700-58/-
maintenance. A Maintenance Allocation Chart will be
NAVSUPINST 4030.29/AFR 71-13/MCO P4030.29A,
and DSAR 4145.8.
1-2. Indexes of Publications
c. Discrepancy in Shipment Report (DISREP) (SF
361). Fill out and forward Discrepancy} in Shipment
a. DA Pam 310-4. Refer to the latest issue of DA
Report (DISREP) (SF 361) as prescribed in AR 55-38/-
Pam 310-4 to determine whether there are new editions,
NAVSUPINST 4610.33A/AFR 75-18/MCO P4610.19B,
changes, or additional publications pertaining to the
and DSAR 4500.15.
equipment.
b. DA Pam 310-7. Refer to DA Pam 310-7 to deter-
mine whether there are modification work orders
1-4. Administrative Storage
(MWO's) pertaining to the equipment.
For procedures, forms, and records, and inspections re-
quired during administrative storage of this equipment,
1-3. Forms and Records
refer to TM 740-90-1.
a. Reports of Maintenance and Unsatisfactory
Equipment. Maintenance forms, records, and reports
1-5. Destruction of Army Materiel
which are to be used by maintenance personnel at all
Destruction of Army materiel to prevent enemy use
maintenance levels are listed in and prescribed by TM
38-750 (Army).
shall be as prescribed in TM 750-244-2.
Section Il. DESCRIPTION AND DATA
1-6. Purpose and Use
verter is taken from the ac power connector (J3) at the
front of the regulator. (Refer to the applicable aircraft
a. Motor-Generator PU-545/A is a
motor-driven in-
technical manual.) Also provided on the front of the
verter designed to convert the 28V direct current (de)
regulator are two test point jacks (J1 and J2) used for
from an aircraft power supply to 115V, 400 Hz alter-
checking the ac power output. An external increase
nating current (at) (single phase) or 110/208V, 400 Hz
volts adjustment resistor permits manual setting of the
alternating current (three phase). The output can be
output voltage.
e i t h e r single-phase or three phase, but not both
simultaneously.
b. Generator Section. The rotating section of the
in-
b. The PU-545/A is used to supply ac to those items of
verter is contained in a heavy metal frame housing. The
an aircraft configuration which require it for operation.
inverter mounting base is a fixed part of the bottom of
the housing, and has four holes for attaching the in-
1-7.
Description
verter to the aircraft. An ac end cover and a fan cover,
one on each end of the inverter, are removable for in-
The inverter is a self-contained unit consisting of a
spection of rotating parts. Both covers are slotted to
static voltage and frequency regulator and rotating sec-
provide an airflow through the rotating section for cool-
tion located in a stator housing.
ing. The airflow intake is through the fan cover, and the
a. Regulator Section. The regulator is housed in a
exhaust is through the ac end cover. Four electrical
rectangular metal box permanently attached to the top
brush holders are installed on the ac end, with four elec-
of the stator housing of the inverter. The top of the
trical caps located externally for checking and re-
regulator can be removed for internal inspection by
placement of the ac brushes.
loosening screw fasteners and lifting off the regulator
c. Additional Equipment Required. A 2 8 V d c
housing cover. The dc power input is connected to the
power source is required to supply input power to the
inverter through the terminal board (TB1) located on
inverter.
the front of the regulator. The ac power output of the in-
1-1