Hobart 9OC24S Operation Manual page 218

4. Safety
FOBART
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HOBART BROTHERS COMPANY
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OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
WARNING: EXERCISE EXTREME CARE TO AVOID CONTACT WITH HIGH VOLTAGE
LEADS AND COMPONENTS WHICH COULD CAUSE SERIOUS SHOCK
AND INJURY IF TOUCHED WHEN TROUBLE SHOOTING OR OPERATING
THE EQUIPMENT.
5. Parts Replacement
To lessen end item "down" time and to get a faulty machine back "on-the-line" as
quickly as possible, the "black-box" concept of parts replacement is reflected in the
trouble shooting chart. For example, if a component in the protective relay tray is
defective, the quickest way to remedy the situation is to replace the complete tray
assembly and send the old tray to stock.
Assemblies which lend themselves to this concept are:
Generator control tray
Protective relay tray
Voltage regulator
Over load module
Protective monitor module
Electric governor control "box"
Hydraulic governor actuator
The above items are in addition to normally replaced items such as injectors,
relays, etc.
6. Test Values
Although test values are provided throughout the trouble shooting chart, where applicable,
additional information and values are given here.
Generator output at maximum
voltage regulator, rheostat setting
134 V or higher
Generator output at minimum
voltage regulator, rheostat setting 108 V or lower
Overload relay trips at any value above 112 KVA in less than 5 minutes.
Overvoltage relay trips at 130 to 134 V AC, resets at 125 V AC.
bdervoltage relay trips at 93 to 103 V AC, resets at 110 V AC.
bdervoltage time delay circuit functions in approximately 5 seconds.
Overfrequency relay trips at 415 to 425 Hz, resets at 415 Hz.
Underfrequency relay trips at 375 to 380 Hz, resets at 385 Hz.
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