IB 6.1.12.1-1C
1
7
ABB
3. Mobil 28 grease as an alternative to Anderol 757
(for refurbishment only). ABB strongly
recommends using only one type of grease
throughout the breaker.
CAUTION
Anderol 757 and Mobil 28 are substantially incompatible
greases. Before relubricating parts with either grease,
thoroughly remove the existing lubricant. Furthermore, parts
ordered for replacement are lubricated with Anderol 757, which
must be removed before use with Mobil 28 lubricant.
CAUTION
Do not apply grease to the latching or roller surfaces of either
the primary or secondary trip latches. The working surfaces
were designed without grease that will otherwise collect
debris.
When operated by the schedule of Table 1, K-Line
circuit breakers should not need renewed application
of grease to parts between scheduled maintenance
intervals. Reapply grease when parts are removed,
replaced, or cleaned. Wipe away excess grease
outside of working surfaces. If the service
environment has unduly contaminated the lubricant,
then cleaning and reapplication may be necessary.
Proper re-lubrication requires disassembly and
thorough cleaning before applying new grease.
Thoroughly wash used bearings to remove old
lubricant or debris. Thoroughly wash new bearings to
remove the packaged grease, which may be
incompatible with the grease applied. Dry bearings
before packing with fresh grease.
Do not apply any lubrication to cadmium plated
current path parts of special cadmium plated
breakers.
CAUTION
When mechanism cleaning and re-lubrication is required, do
not use solvents. Solvents introduce foreign debris into
bearings, strip remaining lubricant from working surfaces, and
can leave a binding residue. A mechanism with contaminated
grease should be completely refurbished.
CAUTION
DO NOT apply light machine oil or thin spray lubricants to
lubricate any mechanism part.
CAUTION
DO NOT attempt to re-lubricate the spring charging motor
gearbox; it is sealed and should not require re-packing.
CAUTION
DO NOT lubricate, clean, or spray the magnetic latch device
with any substance.
Structural Insulation
Insulated parts should be checked for damage. Glass-
polyester insulation may be cleaned with a clean cloth
and denatured alcohol. While cleaning parts, avoid
getting alcohol on points of lubrication. Test the
insulation dielectric as described in the
Insulation
Withstand
section.
Setting Adjustments
The breaker control devices utilize self-locking
hardware that should not be routinely adjusted;
otherwise, the locking feature becomes increasingly
compromised.
Device settings are factory established and will not
normally need subsequent readjustment unless the
device is malfunctioning, removed, replaced, or
indirectly affected by other device adjustments.
Several device settings work dependently on the latch
and tripper bar. Should the latch engagement or
tripper bar travel be adjusted, reestablish the setting of
all affected devices.
Contact Structure
Contact structure adjustment is a routine maintenance
item and must be checked at every service interval.
Contact adjustment is an iterative process of both
pressure and simultaneous-make adjustments. The
measurement may vary slightly each time that it is
checked. Avoid undue “searching” which will wear the
locking material of the adjustment stud. If an adjusting
stud appears not to hold the contact pressure setting
while making operational checks, then apply “blue”
Loctite to the threads and consider replacing the part.
Adjust pressure accordingly by turning the adjustment
screw in the direction shown in Figure 6d.
Perform any contact structure adjustment as described
in the
Slow-close Procedure
section.
CAUTION
The contacts are set on a closed breaker. Keep clear of
potential moving parts should you inadvertently trip the
breaker during adjustment.
225 Ampere Frames
1. Same as step #1 for the 600 and 800 ampere
frames.
2. Contact pressure is established by adjusting the
stud for 1-3/4” ± 1/32” open-air gap as
dimensioned at
A
in Figure 6a. Any adjustment of
contact pressure must be followed by the
simultaneous-make adjustment in step #3.
3. Same as step #3 for the 600 and 800 ampere
frames.
If for any reason the contact structure is removed from
the breaker, upon assembly, reapply clean NO-OX-ID
“A-Special” to the ends of the contact bushing. Torque
the hinge-joint nut between 15 and 25 lb-ft to maintain
the continuous current rating of the circuit breaker.
