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IB 6.1.12.1-1C
Secondary
Close Latch
Close Latch
Release Rod
Figure 7. Close Latching System on EO Mechanisms. Left-
hand view. Shown in the charged and latched position.
Control Relay Device
The control relay device is adjusted before leaving the
factory. It is recommended that no attempt be made to
adjust the internal relays and contacts of this device in
the field. If replacement of the control device is
required, adjust the close latch release rod travel after
installing the new control relay device.
Close Latch Release Rod Travel
The release rod is externally integrated on the left
side of the control relay device. Make this adjustment
whenever the close latches are replaced or the control
relay device is replaced.
1. Reverse the release rod CCW (viewed from the
striking head) and check that the circuit breaker
will not close by attempting to close it electrically or
manually by pushing the release rod through its full
range of travel.
2. Charge the closing springs. Push up and hold the
release rod at full travel. Advance the release rod
CW until the circuit breaker closes.
3. From the closing threshold, advance the release
rod an additional 1-1/2 revolutions CW.
To ensure a properly matched style of latches, ABB
recommends replacing both the secondary and
primary close latches as a set.
Trip Latch Engagement
This adjustment affects the setting for the tripper bar,
shunt trip device, magnetic latch device, OD devices,
and the undervoltage device. Do not adjust the trip
latch setting unless the mechanism malfunctions or is
refurbished. The screws for adjusting the trip latch
engagement ("bite") and the tripper bar travel are
located on the right-hand mechanism housing. Access
Courtesy of NationalSwitchgear.com
Primary
Close Latch
Primary Close
Latch Roller
Charging Cycle
Limit Switch
Control Relay
Device
the screws from the top of the breaker. To adjust the
latch engagement, proceed as follows:
WARNING
This adjustment is made on a closed breaker. Keep hands and
tools clear of moving parts while setting the device.
Furthermore, the breaker may trip before the point anticipated.
1. If the circuit breaker will not latch closed, reverse
the inner adjusting screw CCW enough to ensure
latch engagement.
2. Close the circuit breaker.
3. Slowly advance the adjusting screw CW until the
trip latches release and trip the breaker open.
4. Reverse the adjusting screw 2 revolutions CCW
further
to
establish
engagement.
Tripper Bar Travel
This adjustment sets an appropriate amount of play
between the tripper bar and the secondary trip latch.
Without this play, incidental shock vibration may
subject the breaker to nuisance tripping. The adjusting
screw for the tripper bar engagement is located
adjacent to the latch engagement adjusting screw.
Proceed as follows to adjust the tripper bar latch
engagement:
1. Reverse the adjusting screw (CCW) to assure
excessive tripper bar travel.
2. Close the circuit breaker.
3. Slowly advance the adjusting screw CW until the
latch just releases, tripping the circuit breaker
open.
4. Reverse the adjusting screw 3-1/2 revolutions
CCW.
ABB
sufficient
trip
latch
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