One Count-to-Open Switch
When set to the ONE COUNT TO OPEN position, the section-
alizer will open on the completion of the first overcurrent count.
This feature provides added safety during downline hot-line
work. The operation of this switch also cancels out any accu-
mulated memory time and resets the count to zero.
Lamp Test Contact Position Switch
When set to CONTACT POSITION, this momentary con-
tact, center-off switch energizes the appropriate lamp to indi-
cate the position of the main contacts in the sectionalizer;
green lamp indicates open, the red lamp indicates closed.
In the LAMP TEST position, both lamps are energized
to check their condition.
Battery Test Terminals
The battery test terminals enable convenient checking of
the battery voltage, charging rate and battery quiescent
drain current.
Battery Load Test
This switch is used in conjunction with the BATTERY TEST
TERMINALS. While checking battery voltage, pressing this
button connects a 10 ohm load resistor over the battery,
allowing measurement of loaded battery voltage.
Manual Trip Lever
In addition to the controls described above, a manually
operated trip lever is located on the underside of the
operator cabinet. Capable of being operated with a hook-
stick, this lever will mechanically trip the operating mech-
anism to open the sectionalizer.
Once pulled down, the lever stays down and disables the
closing circuit to block closing of the sectionalizer. The lever
must be returned manually to its “UP” position to re-activate
the closing circuit.
INDICATING DEVICES
In addition to the contact position indicator lamps on the con-
trol panel; a contact position indicator and an operations
counter are located under the sleet hood, on the mechanism
operator cabinet.
The yellow contact position indicator is pinned to the
main operating shaft of the sectionalizer to indicate the
OPEN and CLOSED condition of the main contacts.
The operations counter gives a visual indication of the
cumulative number of openings of the unit.
SETTINGS
The operating characteristics are preset to customer
specifications and tested prior to shipment from the facto-
ry. However, if the sectionalizer is relocated or the coordi-
nation scheme is modified, the operating characteristics
can be easily changed in the field. The settings should be
checked before the unit is put into service. All settings
are located on the printed circuit board mounted on the
control front panel. See Figure 3.
NOTE: Before changing the trip resistor settings, the section-
alizer must be bypassed and de-energized.
Figure 3.
Operator Control Panel.
911042KMA
5
S270-21-1
GROUND MINIMUM
ACTUATING CURRENT
RESISTOR
PHASE MINIMUM
ACTUATING CURRENT
RESISTOR
COUNT RESET
SELECTOR
115VAC BREAKER
SWITCH
ONE-COUNT-TO-
OPEN SWITCH
REMOTE CONTROL
SWITCH
LAMP TEST, CONTACT
POSITION SWITCH
COUNT-TO-OPEN
SELECTOR
MANUAL CONTROL
SWITCH
BATTERY LOAD
TEST SWITCH
BATTERY TEST
TERMINALS