Eaton 36W-VAC25, Instructions For Installation, Operation And Maintenance

I.B. 3A74499B

Page 30

Effective 11/97

disconnect pins with a shooting wire.  Connect this wire
to the high potential lead of the test machine.  Ground
the breaker frame.  Starting with zero, increase the volt-
age to 1500 volts rms.  Maintain the voltage for one
minute.  Successful withstand indicates satisfactory
insulation strength of the secondary control circuit.
Remove the shooting wire and reconnect the motor
leads.

6-8  PRIMARY CIRCUIT RESISTANCE CHECK

Since the main contacts are inside the vacuum cham-
ber, they remain clean and require no maintenance at
any time.  Unlike most typical circuit breaker designs,
W-VAC breakers do not have sliding contacts at the
moving stem either.  Instead they use a highly reliable
and unique flexible clamp design that eliminated the
need for lubrication and inspection for wear.

If desired, the DC resistance of the primary circuit
maybe measured as follows:  close the breaker, pass at
least 100 amps DC current through the breaker.  With
the low resistance instrument, measure resistance
across the studs on the breaker side of the disconnect
for each pole.  The resistance should not exceed the
values shown in Table 6.2.

6-9  MECHANISM CHECK

Make a careful visual inspection of the mechanism for

any loose parts such as bolts, nuts, pins and rings.
Check for excessive wear or damage to the breaker
components.  Operate the breaker several times manu-
ally and electrically.  Check the closing and opening
times to verify that they are in accordance with the limits
in Table 5.1.

6-10  LUBRICATION

All parts that require lubrication have been lubricated
during the assembly with molybdenum disulphide
grease.  Cutler-Hammer M No. 53701QB.  Over a peri-
od of time, this lubricant may be pushed out of the way
of degrade.  Proper lubrication at regular intervals is
essential for maintaining the reliable performance of the
mechanism.  Once a year or every 2000 operations
whichever comes first, the breaker should be relubricat-
ed.  The locations shown in Figure 6-1 should be lubri-
cated with a drop of light machine oil.

After lubrication, operate the breaker several times man-
ually and electrically.  

Roller bearings are used on the pole shaft, the cam
shaft, the main link and the motor eccentric.  These
bearings are packed at the factory with a top grade slow
oxidizing grease which normally should be effective for
many years.  They should not be disturbed unless there
is definite evidence of sluggishness, dirt or parts are dis-
mantled for some reason.

Figure 6-4  “T” contact wipe indicator.

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Figure 6-5  Wipe indicaton.

Close the Breaker

Blue Contact Spring

“T” Shape Visible
“Wipe” Satisfactory

“T” Shape NOT Visible
“Wipe” Unsatisfactory