Hobart Brothers 6910, Operation And Maintenance Manual With Illustrated Parts List

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5. Optional Equipment
Several items of optional equipment are available for units covered by this manual. Each optional item is
covered by its own Instruction and Parts Manual and will not be covered in this basic manual. When appli-
cable, information for optional equipment will be located in Chapter 5. Options are listed as follows:
A. Trailers
A four-wheel trailer with batteries and fuel tank is available, and also a fifth-wheel trailer.
B. Transformer-Rectifier
A transformer-rectifier
(T-R)
is available for use with the generator set. This T-R receives 115/200-V,
400-Hz, AC power from the generator and converts it to a 28.5 V DC output.
C. Truck
Trucks with special bodies for mounting the generator set are available. Compartments in the body
are provided for batteries, cable-storage, etc. Trucks available are Ford, Chevrolet, and GMC.
D. Second Output and Control Box
An auxiliary output and control box is available to provide a second independent 115-V AC output cir-
cuit.
E. Quick Start Kits
(See Section 1-3, Para. 2C)
F. Memory and Time Delay PC Board (Part No. 282308)
In a Hobart generator set, the memory and time delay module is an integral part of the circuitry that
protects the aircraft electrical system against damage which could result from overvoltage, undervol-
tage, overfrequency, or underfrequency. A voltage sensing module and a frequency sensing module
are connected to generator output leads between the generator and load contactor. These solid-state
modules sense any abnormal condition of voltage or frequency and signal the solid-state circuitry of
the memory and time delay module to open the load contactor and disconnect output to the aircraft.
For overvoltage, overfrequency and underfrequency conditions, the memory and time delay module
functions instantly to open the load contactor and disconnect output to the aircraft. But a unit
equipped with the special memory/time-delay module 282308
(depending on the DASH NUMBER
selected) permits various lengths of time delay for opening the load contactor at the occurance of ab-
normal conditions of voltage or frequency. When selected, this option is explained in detail in TO-
210, which would be found in Chapter 5 of this manual.
6. Canopy
This generator set is equipped with a sheet metal enclosure, identified as a canopy
(1, Fig. 1),
which pro-
vides protection for the engine, generator and electrical controls. This canopy has doors on both sides.
Panel mounted instruments may be observed through two Plexiglass windows in the left rear door which
covers the control box and engine control panel. The lower window is slanted outward at the bottom to
provide access to engine controls when the door is closed. A centrally-located lifting eye attached to a lift-
ing yoke extends through the canopy top to provide an attaching point for chains, cables, or hook used to
lift and move the generator set.
OM-2028
1-1 May 1/91 Revised
Page 6