Hobart 9OC24S Operation Manual page 219

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OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
Frequency at rated speed (2400 RPM)
No Load
Full Load
400 Hz f2 Hz.
400 Hz -+2 Hz.
Engine oil pressure (warm and at rated speed 2400 RPM) above 45 PSI.
Engine coolant temperature (normal operation) 1800 to 19OOF.
7. Trouble Shooting Practices
A. General
The most convenient physical method for checking components electrically
is to use the terminal board connections as test points. This method is
used throughout the trouble shooting chart where possible. Some electrical
components, especially in the engine electrical system, are not connected
through terminal boards and must be tested and checked directly through
their own terminal connections.
A composite illustration (Fig. 3) has been
prepared to show and identify all terminal boards which may be used for test
purposes. "Built-in" terminal boards, such as the one on the governor
electric control box, are shown on separate illustrations with the component
of which they are a part.
CAUTION : MAINTENANCE PERSONNEL MUST BE VERY CAREFUL
WHEN PERFORMING TERMINAL-TO-TERMINAL CHECKS
TO BE CERTAIN THE PROPER TERMINALS ARE BEING
USED, ESPECIALLY WHEN USING JUMPER LEADS.
DAMAGE TO ELECTRICAL COMPONENTS MAY RESULT
FROM THE APPLICATION OF IMPROPER VOLTAGE AND
CURRENT.
B. Identification of Terminals
Each terminal board shown in Figure 3 is identified by a letter, i.e., A, B, C,
etc. Each terminal on a board is identifiable by number, i.e., 1, 2, 3, etc.
The quantity of terminals on a single board is either eight, twelve, or twenty.
The most IMPORTANT thing to remember about identification of terminals is that
on each board, TERMINALS are NUMBERED from LEFT to RIGHT on horizontally,
mounted boards, and from BOTTOM to TOP on vertically mounted boards. For
example, a terminal identified as "ElO" is the TENTH terminal from the LEFT on
terminal board "E 'I. "G4" is the FOURTH terminal from the BOTTOM on terminal
board "G 'I. This numbering system is in accordance with standard electrical
practices. Use Fig. 3 to locate the terminal board, then count terminals from
left to right to identify the terminal.
Ott 30/73
3-2
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