Description of Switch Settings
Following are descriptions of the effects of each accessory
switch when it is
enabled:
When a Shunt Trip accessory causes the breaker to
trip, the contacts of the Bell Alarm–Alarm Only also
change state. (The factory switch setting is
disabled.
)
When an Undervoltage Release accessory causes the
breaker to trip, the contacts of the Bell Alarm–Alarm
Only also change state. (The factory switch setting is
disabled.
)
When
a
protection
trip
(long-time,
short-time,
instantaneous,
ground-fault,
or
protective-relay)
occurs, the contacts of the Bell Alarm–Alarm Only also
change state. (The factory switch setting is
enabled
.)
When a Shunt Trip accessory causes the breaker to
trip, the contacts of the Bell Alarm with Lockout also
change state. (The factory switch setting is
disabled.
)
When an Undervoltage Release accessory causes the
breaker to trip, the contacts of the Bell Alarm with
Lockout also change state. (The factory switch setting
is
disabled.
)
When
a
protection
trip
(long-time,
short-time,
instantaneous,
ground-fault,
or
protective-relay)
occurs, the contacts of the Bell Alarm with Lockout
also change state. (The factory switch setting is
enabled.
)
Procedure for Changing Switch Settings
Change the accessory switch settings with the following
procedure:
WARNING:
Before
beginning
this
procedure,
turn the breaker off,
disconnect
it
from
all
voltage sources, and discharge the closing springs.
AVERTISSEMENT:
Avant
de
commencer
cette
procédure, mettre le disjoncteur en position OFF, le
déconnecter de toute tension d’alimentation, et désarmer
les ressorts de fermeture.
1.
2.
Loosen the four #8-32 screws on the breaker trim-plate
assembly and remove the trim plate.
Loosen the four #10-32 screws at the corner of the
breaker cover. Remove the cover from the breaker face.
Pull the Trip Unit locking lever to the right, then hold
the Trip Unit near the battery cover and lift it straight
out of the breaker.
3.
4.
6.
7.
8
.
Refer to Figure 4 and Table 2 to determine the
switches to be changed.
Push in the appropriate “Enable” or “Disable” side of
the switch.
Confirm all switch settings before reinstalling the Trip
Unit in the breaker.
Pull the Trip Unit locking lever to the right. While
holding the lever, carefully align the connector on the
rear of the Trip Unit with the connector in the breaker.
Press down on the Trip Unit, while holding it near the
battery cover. When the Trip Unit is fully seated, slide
the locking lever back to the left.
Reinstall the breaker top cover and tighten the four
#10-32 screws to 32 in-lbs.
Replace the trim plate and tighten the four #8-32
screws to 20 in-lbs.
Verify that the switch settings are correct by inducing
breaker trips from the UVR and Shunt Trip or Shunt
Trip with Lockout (if present) and checking the
responses of the Bell Alarm–Alarm Only and Bell Alarm
with Lockout accessories.
Test Procedure
Use the following procedure to test the UVR for proper
operation.
3
1.
2.
3.
4.
5.
6.
9
.
10
.
5
.
Open the breaker.
Turn off the power to the UVR.
Try to manually close the breaker; the breaker should not
close.
Apply at least 80% of the rated voltage specified on the
UVR name plate to the UVR control inputs.
Try to close the breaker; it should close as normal.
If a MicroVersaTrip Plus or MicroVersaTrip PM Trip Unit is
installed, check that the Trip Unit display is active
(powered).
With the breaker closed, reduce the UVR control voltage
to 35–60% of the rated voltage; the breaker should trip
within 0.5 second.
If a Bell Alarm–Alarm Only or Bell Alarm with Lockout is
present, ensure that they activate (or do not activate) as
selected by the MicroVersaTrip Plus or MicroVersaTrip
PM Trip Unit DIP switches.
1
.
2
.
3
.
4
.
5
.
6
.
7
.
8
.
