Geko Eisemann 40001 ED-S/DEDA Bedienungsanleitung Seite 78

RECTIFIER ASSEMBLY REMOVAL
The rectifier assembly cannot be removed until the opposite drive end bearing bracket and bearing have been removed(see bearing removal procedure). Remove the three exciter rotor leads from the
heat sinks and the two main rotor leads from the main rotor posts (see Figures). Remove the screws securing the rectifier assembly and pull the assembly free from the shaft.
DIODE REPLACEMENT
Prior to installing a replacement diode on the heat sink, apply a thin film of conductive heat sink compound around the base of the diode (do not coat the threads). When installing a diode on the heat
sink, care should be taken not to over torque the retaining nut which could cause damage to the device. Torque to 28 pound inches. If not damaged, the existing diode leadwire may be unsoldered from
the failed diode, and resoldered on the replacement.
TROUBLESHOOTING
This section is intended to suggest a systematic approach to locating and correcting generator malfunctions. The section is arranged according to the symptoms of the problem. The steps have been
arranged in an attempt to do the easychecks first and prevent further damage when troubleshooting a disabled machine. The first step of troubleshooting is to gather as much information as is possible
from operating personnel and individuals present during the failure. Typical information includes: how long the unit had been operating; what loads were on line; weather conditions; protective equip-
ment that did or did not function. In addition, information as to the operating condition of the generator's prime mover is vital. Has the prime mover been maintaining constant speed? If not, have there
been extended periods of under speed operation? Has the prime mover experienced an over-speed condition? If yes, what was the maximum speed, and how long did the unit operate at that elevated
speed? The generator speed should be maintained at rated nameplate value during all operating tests. The frequency of the generator depends upon rotational speed. Most regulators used with enera-
tors have built in under frequency protection such that if the speed is reducedmore than 5%, the voltage will drop off rather rapidly with further reductions in speed.
HIGH VOLTAGES MAY BE PRESENT AT THE GENERATOR'S TERMINALS WHEN THE UNIT IS RUNNING. SOME ACCESSORY EQUIPMENT SUCH AS SPACE HEATERS MAY BE ENERGIZED FROM
AN OUTSIDE POWER SOURCE WHEN THE UNIT IS AT REST.
TOOLS, EQUIPMENT, CLOTHING AND YOUR BODY MUST BE KEPT CLEAR OF ROTATING PARTS AND ELECTRICAL CONNECTIONS.
SPECIAL PRECAUTIONS MUST BE TAKEN DURING TROUBLESHOOTING SINCE PROTECTIVE COVERS AND SAFETY DEVICES MAY BE REMOVED OR DISABLED TO GAIN ACCESS AND PER-
FORM TESTS. BE CAREFUL. SERIOUS PERSONAL INJURY OR DEATH CAN RESULT FROM THESE HAZARDS. CONSULT QUALIFIED PERSONNEL WITH ANY QUESTIONS.
36 12.2006