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Figure 1-1. Inverter, Power, Static PP-7078/U and master/slave cable assembly.
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TM-11-6130-377-14 Inverter Power Static PP-7078/U Manual
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System Application
TM 11-6130-377-14
Commander, US Army Communications and Electronics
DAAB07-74-C0465.
Inverters procured
Materiel Readiness Command, ATTN: DRSEL-ME-MQ,
under the 1973 contracts differ from
Fort Monmouth, NJ 07703. We'll send you a reply.
those procured under the 1974 contract.
These differences are internal and do not
NOTE
affect overall equipment interchange-
Inverters covered in this manual were
ability.
Refer to paragraph 1-8.1 for
procured  under  Contract  Numbers
specific differences.
DAAB07-73-C-0233, DAAB07-C0327, and
Section II. DESCRIPTION AND DATA
located inside the inverter and the cables from external
1-7. Purpose and Use
equipment must be routed to their respective terminal
The inverter (fig. 1-1) is a general purpose, direct current
boards through openings in the rear panel of the inverter.
(dc) to alternating current (ac), static inverter which
Fan openings (figs. 2-1 and 3-1) are provided in the front
provides a 120-volt alternating current, 60 Hz, 50
indicator panel and the right side panel to enable cooling
amperes (5 kW) power source for use in those locations
air to be drawn in and exhausted to maintain operating
where the primary power source is 110 volts direct
temperatures within the inverter.
current.  Two inverters can be connected in parallel to
c.  The Master/Slave cable assembly (Deltec Part
provide twice the power output, 100 amperes (10kW), if
No. 5122418) is used between two inverters when they
required.
are operated in parallel (para. 2-4).
1-8. Description
1-8.1. Differences in Models
a. The basic functional entities of the inverter (fig. 1-
Front panel markings of the inverters differ only in item
2) are the input filter, inverter drive, silicone controlled
identification on the nomenclature plate (lower left corner)
rectifier (SCR) inverter, and the ferroresonant transformer
and across the front panel. The 1973 model front panel
and filter. The input filter attenuates noise such that the
marking is: STATIC INVERTER MODEL DI-5003-259; the
inverter does not introduce noise back onto the input dc
1974 model marking is: INVERTER, POWER, STATIC
line. The inverter driver operates the SCR inverter at a
PP-7078/U.  Wiring differences between models are
frequency of 60 Hz which in turn, operates in a square
indicated in figures FO-1 and FO-1.1.  Inverter drive
wave mode to drive the ferroresonant output transformer.
circuit board A1A1A2, Part Number 5122348, is contained
The ferroresonant transformer and filter provide a 120-
in the 1973 model; Part Number 5123023 is contained in
volt, 60-Hz sine wave output, with voltage regulation,
the 1974 model. Differences in reference designations of
current limiting, and harmonic suppression.
identical components (electrical) are indicated in a below.
Other differences are indicated in b below.
a. Reference Designation Differences.
1973 model
1974 model
A1C2
A1C1
A1C3
A1C2
A1C4
A1C3
A1CR5
A1CR3
A1CR6
A1CR4
A1CR7
A1CR5
A1K4
A1K1
A1L3
A1L4
A1L4
A1L5
A1L5
A1L3
Figure 1-2. Simplified block diagram.
A1Q3
A1Q1
A1Q4
A1Q2
b. The front indicator panel of the inverter is hinged
A1R6
None
on the left side and can be opened to gain access to the
A1R9
A1R2 and A1R3
various internal components and the terminal boards.
A1A2C2
A1A2C26
Mounted on the panel are the operators' controls and
instruments.  The input/output terminals (fig. 2-1) are
Change 1
1-3

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