GE Industrial Solutions PowerVac with ML-18 or ML-18H Mechanism - Manual (Page 24)

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After adjustment of the left and right phase, remeasure the
center phase. The center phase should not exceed 0.60 inch.
If it does then readjust the left and right phases.
16.4—Trip Coil Plunger
To adjust trip coil plunger gap (Figure 10), lift locktab away
from adjusting nut. Turn adjusting nut until trip pin makes
contact with trip arm while maintaining dimension T. Bend
locktab to secure adjusting nut.
Reference DIMENSIONAL CHECKS for breaker position and
spring status.
16.5—Close Coil Plunger
To adjust the close coil plunger gap, Figure 9, lift locktab away
from adjusting nut. Turn adjusting nut until close latch actuator
makes contact with close latch while maintaining the correct
plunger dimension. Bend locktab to secure adjusting nut.
Reference dimensional checks for required dimension and
breaker position and spring status.
16.6—Close Latch Stop Bolt
SHOULD NOT BE ROUTINELY ADJUSTED - WILL AFFECT
CLOSE SPRING DISCHARGE INTERLOCK SETTING.
All PowerVac
® circuit breakers with ML-18 mechanisms and a
type designation ending in -0, -1 & -2 have an adjustment bolt
for the close latch. The adjustment for the close latch stop
bolt item (item16, Figure 23) is made with the breaker open
and the closing spring charged.
Step one is to turn the 1/4-20 adjusting bolt in against the
close latch until the closing spring discharges. Step two is to
then back out the bolt 1/2 turn (three flats on head of bolt).
Step three is to check for proper holding of the latch on
recharging of the closing spring. If the latch fails to reset and
hold the spring, back the bolt out 1 or 2 additional flats.
All PowerVac
® circuit breakers with ML-18 mechanisms and a
type designation ending in -3 have no adjustment bolt for the
close latch. ML-18H mechanisms also do no have adjustment
bolts. A permanent stop with no adjustment is provided by a
pin attached to the mechanism side.
16.7—Close Spring Discharge Interlock
THIS INTERLOCK IS FACTORY SET AND SHOULD NOT BE
ROUTINELY ADJUSTED IN THE FIELD. The adjustment for
this interlock is as follows. (See Figure 15).
Figure 15 Spring Discharge Interlock
The breaker should be open with the closing spring charged.
1. Back off 1/4 inch linkage adjusting screw.
2. While holding roller at 0.995 inch dimension, advance
adjusting screw to just touch interlock lever.
3. Check that spring discharges with roller at 0.561 inch
minimum dimension.
4. Close latch must reset as indicated.
16.8—Negative Interlock
THIS INTERLOCK IS FACTORY-SET AND SHOULD NOT BE
ROUTINELY ADJUSTED IN THE FIELD. The negative interlock
is adjusted with the breaker closed and the closing spring
discharged. (See Figure 25).
1. Hold roller at 0.670 inch from mechanism side plate.
Adjust linkage so the striker just makes contact with
properly adjusted trip linkage.
2. Lock in place with 1/4 inch hardware and rivet.
3. Check that breaker trips with roller at 0.531 inch
minimum dimension.
4. Check that linkage moves freely.
CAUTION: THIS IS A SAFETY FEATURE
NOT A ROUTINE MAINTENANCE ITEM