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.
)
F actory
Switch
S
etting
1
Di sabled
2
Di sabled
3
E nabled
4
Di sabled
5
Di sabled
6
E nabled
AVERTISSEMENT:
Avant
de
commencer
cette
proc
é
dure, mettre le disjoncteur en position OFF,
le
d
é
connecter de toute tension d'alimentation, et
d
é
sarmer les ressorts de fermeture.
1.
Loosen the four #8-32 screws on the breaker trimplate
assembly and remove the trim plate.
2.
Loosen the four #10-32 screws at the corner of the
breaker cover. Remove the cover from the breaker face.
3.
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.
4.
5.
6.
7.
8.
Refer to Figure 4 and Table 4 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-lb.
9. Replace the trim plate and tighten the four #8-32
screws to 20 in-lb.
10. Verify that the switch settings are correct by inducing
breaker trips from the Shunt Trip and Undervoltage
Release (if present) and checking the responses of the
Bell Alarm-Alarm Only and Bell Alarm with Lockout
accessories.
Test Procedure
Test the Shunt Trip for proper operation with
the
following
procedure.
1.
Turn off the power to the Shunt Trip.
2.
Close the breaker contacts.
3.
Apply at least 55% of the rated ac voltage to the Shunt
Trip; the breaker should trip immediately.
4.
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 MicroVersa
Trip PM Trip Unit DIP switches.
—
Figure 4. Accessory switch on the rear of the Micro Versa Trip Plus™ or MicroVersaTrip PM™ Trip Unit,
showing the factory settings (solid part indicates that the switch is pushed in on that side).
—
Table 4. Accessory switch settings, including the factory defaults.
Procedure for Changing Switch Settings
Change the accessory switch settings the with the following
procedure:
WARNING:
Before beginning this procedure, turn the
breaker off, disconnect it from all voltage sources, and
discharge the closing springs.
Shunt trip activates Bell Alarm-Alarm Only
1.
2
.
3
.
4
.
5
.
6
.
Function
Protection trip activates Bell Alarm with
Lockout
UVR trip activates Bell Alarm with Lockout
Shunt trip activates Bell Alarm with
Lockout
Protection trip activates Bell Alarm-Alarm
Only
UVR trip activates Bell Alarm-Alarm Only
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, instantan-
eous,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 settin g 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, instan-
taneous, ground-fault, or protective-relay) occurs, the
contacts of the Bell Alarm with Lockout also change
state. (The factory switch setting is
enabled.
)
3