59
Rev.12/31/97
Once every 6 months, remove bearing covers; clean out old grease; flush the
bearings and bearing chamber with kerosene; and repack the bearing loosely
with clean, neutral mineral grease, filling about one-fourth full. Do not
neglect the complete flushing of the bearing chamber and replacement of
the grease every 6 months; otherwise, the grease will pack and harden, and
the balls will drag and slide rather than roll on the races, resulting in
overheating and scoring. Do not use grease containing vegetable or animal
oils or graphite; vegetable and animal oils develop acids that are highly
destructive to the finely polished surfaces of the balls and raceways. The
rolling action of the balls will pack graphite into the surface of the raceways
and close the necessary clearance between balls and races. The grease
container should always be kept tightly sealed because dust and grit will
quickly destroy any ball bearing. Also be sure that tools used to remove
grease from the container are perfectly clean. Follow the above instructions
carefully. More ball bearings are destroyed by the use of dirty or too much
grease than from any other cause.
bearings and bearing chamber with kerosene; and repack the bearing loosely
with clean, neutral mineral grease, filling about one-fourth full. Do not
neglect the complete flushing of the bearing chamber and replacement of
the grease every 6 months; otherwise, the grease will pack and harden, and
the balls will drag and slide rather than roll on the races, resulting in
overheating and scoring. Do not use grease containing vegetable or animal
oils or graphite; vegetable and animal oils develop acids that are highly
destructive to the finely polished surfaces of the balls and raceways. The
rolling action of the balls will pack graphite into the surface of the raceways
and close the necessary clearance between balls and races. The grease
container should always be kept tightly sealed because dust and grit will
quickly destroy any ball bearing. Also be sure that tools used to remove
grease from the container are perfectly clean. Follow the above instructions
carefully. More ball bearings are destroyed by the use of dirty or too much
grease than from any other cause.
The motor-generator should be shut down when adding oil because the oil
level is always slightly lower when the machine is running, which can cause
danger of overfilling and subsequent waste of oil and fouling of the windings.
level is always slightly lower when the machine is running, which can cause
danger of overfilling and subsequent waste of oil and fouling of the windings.
Proper oil level is about 1/16 inch below the top of the overflow fitting on the
side of the bearing. The following schedule is recommended:
side of the bearing. The following schedule is recommended:
Once each week
Check the oil level and add oil if necessary. Inspect oil rings
to see that they are rotating with the shaft and carrying oil to the journal.
Once every month
Drain the bearing chamber completely. Flush with a
clean, light oil, and refill within 1/16 inch of the top of the overflow fitting
using a high grade, medium machine oil.
using a high grade, medium machine oil.
9.2 STATIC RECTIFIER CHARGERS
9.2 STATIC RECTIFIER CHARGERS
Static rectifier chargers are generally provided with automatic voltage-
regulation features. Maintenance personnel must always refer to
manufacturer's instructions and service manuals for correct operation,
maintenance, and care procedures. This charger consists of a saturable
reactor, a transformer, a silicon rectifier controlled by a sensing device, a
magnetic amplifier, and a reference voltage.
regulation features. Maintenance personnel must always refer to
manufacturer's instructions and service manuals for correct operation,
maintenance, and care procedures. This charger consists of a saturable
reactor, a transformer, a silicon rectifier controlled by a sensing device, a
magnetic amplifier, and a reference voltage.
Battery chargers of this type exhibit a constant voltage output characteristic
under changing load conditions and a-c supply fluctuations. This charger,
when operating within its current rating, will maintain the float voltage or
the equalizing voltage within 1 percent. The charger will do this with a-c
supply voltage fluctuations of ±10 percent.
under changing load conditions and a-c supply fluctuations. This charger,
when operating within its current rating, will maintain the float voltage or
the equalizing voltage within 1 percent. The charger will do this with a-c
supply voltage fluctuations of ±10 percent.
The magnetic amplifier charger is capable of regulating the voltage down to
zero load, but only when the battery is connected to the charger output.
Chargers may be equipped with copper oxide rectifiers, selenium rectifiers,
or silicon rectifiers.
zero load, but only when the battery is connected to the charger output.
Chargers may be equipped with copper oxide rectifiers, selenium rectifiers,
or silicon rectifiers.